TW201131015A - Method for heating steel sheets for hot press forming - Google Patents

Abstract

The object of the present invention is to provide a method for heating steel sheets for hot press forming which has advantages capable of having high productivity to obtain hot press forming articles having excellent spot welding. The present invention provides a method for heating steel sheets for hot press forming which comprises a step: heating steel sheets for hot press forming which comprises a member is formed by using a coating material comprising a binder and a metal filler, at the temperature of T1 ( DEG C ) in the rang from of ambient temperature to 350 DEG C to the temperature of T2 ( DEG C ) in the rang of 800 to 1200 DEG C, required time t (second) in the range of 1 to 120 seconds; and required times of the method are in the range of 1 to 120 seconds in total.

Description

201131015 六、發明說明： 【發明所屬之技術領域】 本發明是關於一種熱壓用鋼板之加熱方法等。 【先前技術】 近年來對於地球溫暖化、大氣污染、石化燃料之枯竭 等環境問題的意識提高’以致對於汽車方面已演變至強烈 地要求對改善耗油量及減少c 0 2貢獻很大的車體之輕量化 。其中，藉由將使用於汽車的薄鋼板加以高強度化來一邊 考慮沖撞安全性一邊減少車體重量之技術已有所進展。此 等技術之具有代表性者則有熱壓。 熱壓是一種將鋼板加熱至約800至約1200 °C以使其進 行沃斯田變態（austenite transformation)，隨後使用金屬 模來成形鋼板並加以驟冷而使其變態成麻田散（martensite )相之方法。藉由熱壓即可獲得高強度之成型品。 在熱壓，在進行加熱鋼板時及將經加熱的鋼板加以成 形並加以驟冷時，在鋼板之表面將形成鐵氧化物（氧化皮 層：scale)。因此，爲移除在成型品表面所形成的氧化皮 層，一般是對該表面噴射高壓水、或施加珠粒噴擊等之步 驟。然而，由於製程數增加而導致時間性及金錢性的成本 增加。因此，一向是在檢討一種經抑制氧化皮層的形成之 熱壓用鋼板。 經獲得抑制氧化皮層的形成之熱壓用鋼板，已在發明 專利文獻1揭示一種合金化熱浸鎞鋅鋼板。然而，爲製造 -4 - 201131015 合金化熱浸鏟鋅鋼板，卻需要將熱浸鏡鋅鋼板在550至650 °C下進行加熱之步驟。 在發明專利文獻2則揭示一種具有經使用含有黏合劑 與金屬塡充劑之塗布材料所形成皮膜之熱壓用鋼板。該熱 壓用鋼板是藉由將如上所述塗布材料塗布於鋼板，並進行 加熱該鋼板即可簡便地獲得。然而，將該熱壓用鋼板在950 °C保持4分鐘’其次加以成形並加以驟冷以獲得熱壓成型 品時’該成型品之點熔接性卻非爲可充分令人滿足者。 先前技術文獻 發明專利文獻 發明專利文獻1 日本發明專利特開第2003- 1 2692 1號公報 發明專利文獻2 國際公開第2009/021489號小冊子 【發明內容】 〔所欲解決之技術問題〕 本發明之課題是提供一種熱壓用鋼板之加熱方法等， 其具有可從具有經使用含有黏合劑與金屬塡充劑之塗布材 料所形成皮膜之熱壓用鋼板，以高生產性獲得具有優異的 點熔接性等優點。 〔解決問題之技術方法〕 本發明係提供下列第（1 )至（2 0 )項發明。 (1) 一種熱壓用鋼板之加熱方法，其包括：自室溫至 350 °C之範圍的溫度T1(°C)起至800至1200°C之範圍的 溫度T 2 ( °C )爲止，以1至1 2 0秒之範圍·的所需時間t ( -5- 201131015 秒）進行加熱具有經使用含有黏合劑與金屬塡充劑之塗布 材料所形成皮膜之熱壓用鋼板之步驟。 (2) 如上述第（1)項之熱壓用鋼板之加熱方法，其 包括自該溫度T 1 ( t )起至該溫度T2 ( t )爲止，以該所 需時間t (秒）進行加熱該熱壓用鋼板之步驟。 (3) 如上述第（1)項之熱壓用鋼板之加熱方法，其 包括；自該溫度T1(°C)起至該溫度12(1)爲止，以該 所需時間t (秒）進行加熱該熱壓用鋼板之步驟； 其次，以800至120CTC之溫度進行加熱該熱壓用鋼板 之步驟；且 所需時間之總計爲2至1 2 0秒。 '(4)如上述第（1)至（3)項中任一項之熱壓用鋼板 之加熱方法，其中以（T2-Tl)/t之式所計算得之値爲在10 至3 3 0 °C /秒之範圍。 (5)如上述第（1)至（4)項中任一項之熱壓用鋼板 之加熱方法，其中該溫度T1爲室溫。 (6 )如上述第（1 )至（5 )項中任一項之熱壓用鋼板 之加熱方法，其中該溫度T2爲在840至1000 °C之範圍。 (7 )如上述第（1 )至（6 )項中任一項之熱壓用鋼板 之加熱方法，其中該所需時間t爲3秒以上。 (8)如上述第（1)至（7)項中任一項之熱壓用鋼板 之加熱方法，其中該所需時間t爲8 0秒以下。 -6- 201131015 (9) 如上述第（1)至（8)項中任一項之熱壓用鋼板 之加熱方法，其係以電阻加熱方式進行加熱該熱壓用鋼板 〇 (10) 如上述第（5)項之熱壓用鋼板之加熱方法，其 係以電阻加熱方式進行加熱該熱壓用鋼板， 該步驟是包括： 將該熱壓用鋼板之溫度以1至1 0秒之範圍的所需時間 自溫度τ 1 ( t )升溫至溫度τ 1，（ °c )之步驟a ; 其次’將該熱壓用鋼板之溫度以1至5秒之範圍的所 需時間Γ (秒）自該溫度Tl’（ t )升溫至溫度T2’（ °C ) 之步驟b ; 其次’將該熱壓用鋼板之溫度以1至10秒之範圍的所 需時間自該溫度T2，（ °C )升溫至溫度T2 ('。(：）之步驟c :且 該溫度T1’及該溫度Τ'2,爲在300至500 °c之範圍，且 以（Τ2’-Τ1’）/Γ之式所計算得之値爲在_2〇至2〇t增之範圍 〇 (11) 如上述第（9)或（10)項之熱壓用鋼板之加熱 方法’其中該熱壓用鋼板是在其厚度方向之電阻爲1〇以 下之鋼板。 (12) 如上述第（1)至（8)項中任一項之熱壓用鋼 板之加熱方法’其係以紅外線照射方式進行加熱該熱壓用 鋼板。 201131015 (13)如上述第（1)至（12)項中任一項之熱壓用鋼 板之加熱方法，其中該黏合劑是含有有機高分子。 (如上述第（1)至（12)項中任一項之熱壓用鋼 板之加熱方法，其中該黏合劑是含有矽烷水解產物/縮合物 或聚砂氧樹脂。 (15) 如上述第（14)項之熱壓用鋼板之加熱方法’ 其中該熱壓用鋼板是藉由將經塗布含有黏合劑與金屬塡充 劑之塗布材料之鋼板以自室溫起至250至350 °C之範圍的 溫度爲止以3至60秒之所需時間進行加熱而獲得者。 (16) 如上述第（1)至（15)項中任一項之熱壓用鋼 板之加熱方法，其中該金屬塡充劑是含有選自Al、Zn、Mg 、Fe、Sn或含有此等中至少一者的合金中之至少一者。 (17) 如上述第（1)至（16)項中任一項之熱壓用鋼 板之加熱方法，其係在非氧化性氣體之環境氣體下進行加 熱該熱壓用鋼板。 (18) —種熱壓方法，其包括：以如上述第（1)至（ 17)項中任一項之熱壓用鋼板之加熱方法進行加熱具有經 使用含有黏合劑與金屬塡充劑之塗布材料所形成皮膜之熱 壓用鋼板而獲得經加熱之熱壓用鋼板之步驟，及 將該經加熱之熱壓用鋼板加以成形，並將經成形之熱 壓用鋼板加以驟冷之步驟。 (19) 一種熱壓成型品’其係以如上述第（is)項之 熱壓方法而獲得。 -8- 201131015 (20) —種熱壓成型品之製造方法，其包括：以 述第（1)至（17)項中任一項之熱壓用鋼板之加熱方 行加熱具有經使用含有黏合劑與金屬塡充劑之塗布材 形成皮膜之熱壓用鋼板而獲得經加熱之熱壓用鋼板之 ，及 將該經加熱之熱壓用鋼板加以成形，並將經成形 壓用鋼板加以驟冷之步驟。 〔發明之功效〕 根據本發明專利是可提供一種熱壓用鋼板之加熱 等’其具有可從具有經使用含有黏合劑與金屬塡充劑 布材料所形成皮膜之熱壓用鋼板，以高生產性獲得具 異的點熔接性之熱壓成型品等之優點。 【實施方式】 〔本發明之最佳實施方式〕 〔熱壓用鋼板之加熱方法〕 本發明之熱壓用鋼板之加熱方法包括：自室溫至 °C之溫度Tl(°c)起至800至1200°c之溫度T2(°c 止，以1至1 2 0秒之範圍的所需時間t (秒）進行加熱 經使用含有黏合劑與金屬塡充劑之塗布材料所形成皮 熱壓用鋼板之步驟，且所需時間之總計爲在1至1 2 0 範圍。具體而言，其係包括：例如由該步驟所構成之 、將該熱壓用鋼板輸送至該步驟後述，接著在8〇〇至 °C之溫度進行加熱該熱壓用鋼板之方法等，較佳爲由 如上 法進 料所 步驟 的熱 方法 之塗 有優 3 50 )爲 具有 膜之 秒之 方法 1200 該步 -9- 201131015 驟所構成之方法。將該熱壓用鋼板輸送至該步驟後，接著 在8 00至1 200°C之溫度進行加熱該熱壓用鋼板之方法的所 需時間之總計較佳爲在2至1 2 0秒之範圍。 若使用本發明之熱壓用鋼板之加熱方法時，由於可縮 短在熱壓中進行加熱熱壓用鋼板所需之時間，藉由包括該 加熱方法在內的本發明之熱壓方法，則可以高生產性獲得 熱壓成型品。 · 用於加熱該熱壓用鋼板之該步驟的具體實例是包括： 例如將室溫（例如-10至40 °c之溫度）、或經加熱成350 °C以下的該熱壓用鋼板，藉由紅外線照射方式、電阻加熱 方式等加熱方式’以1秒以上且短於1 2 0秒之範圍的所需 時間進行加熱至8 00至1 200°C之溫度之步驟等。經加熱成 3 5 0 °C以下的該熱壓用鋼板也包括例如爲使皮膜形成於鋼 板而以35〇°C以下之溫度進行加熱經塗布如前所述塗布材 料之鋼板而獲得者等在內。 在下文中，有時候則將具有經使用含有黏合劑與金屬 塡充劑之塗布材料所形成皮膜之熱壓用鋼板稱爲「工作件 (work)」。 在本發明之加熱方法中，用於加熱工作件之步驟（在 下文中，有時候也僅稱爲加熱工作件之步驟）可在氮氣、 氬氣之非氧化性氣體之環境氣體下或在大氣下進行。 在加熱工作件之步驟中，自溫度Tl(t )起至溫度T2 (°C )爲止’以所需時間t (秒）進行加熱工作件時，較佳 -10- 201131015 爲以（T2-Tl)/t之式所計算得之値爲在10至3 3 0°C/秒之範 圍。在下文中，有時候則將以（T2-Tl)/t之式所計算得之値 稱爲「平均加熱速度」。平均加熱速度愈大的步驟係意謂 其爲愈可以更短的所需時間加熱工作件之步驟。 在加熱工作件之步驟較佳爲所需時間t爲在3秒至8 0 秒之範圍，更佳爲在3秒至30秒之範圍，進一步更佳爲在 3秒至1 0秒之範圍。 使用於加熱工作件之步驟的加熱方式是包括：例如紅 外線照射方式、電阻加熱方式（ERH )、感應加熱方式等 〇 紅外線照射方式是包括：例如使用短波長紅外線之方 式（NIR )、使用中波長紅外線之方式、使用長波長紅外線 之方式（FIR )等。紅外線照射方式之具體實例是包括：例 如將具備長波長紅外線加熱器裝置之長波長紅外線爐之爐 內溫度升溫成800至1200 °C之溫度後將工作件放入於該爐 而進行加熱工作件之方式、將工作件放入於具備短波長紅 外線燈模組之短波長紅外線爐而對工作件照射短波長紅外 線以將工作件加熱至8 0 0至1 2 0 0 °C之溫度之方式等。 電阻加熱方式之具體實例是包括：例如以電極挾住工 作件之兩端並對工作件通電而將工作件加熱至8 00至1200 °C的溫度之方式等。藉由電阻加熱方式進行加熱工作件時 ’較佳爲預先移除電極與工作件將要接觸的部分之皮膜， 或是使用在厚度方向之電阻爲1Ω以下的工作件。藉由使用 -11- 201131015 在厚度方向之電阻爲1Ω以下的工作件等，在對工作 時則可抑制電極與工作件相接觸之部分受到極度的 更佳爲在厚度方向之電阻爲0.5Ω以下。 在厚度方向之電阻爲1Ω以下之工作件是包括 使用ΝΑΝΟ-Χ公司製造之VPC〇43 74作爲塗布材料 之具有膜厚爲5 μιη以下之皮膜的工作件等。 此外，電阻加熱方式是可以非常快速而加熱工 吾所欲之溘度。藉由電阻加熱方式在大氣下進行加 件至800至1200C之溫度時’在加熱中則有可能發 之分解燃燒。從安全性的觀點，較佳爲避免此現象 更安全地加熱工作件之方法是包括：例如 (1)在氮氣、氬氣之非氧化性氣體之環境氣體 加熱工作件之方法： (2 )在加熱工作件之裝置局部性地設置排氣等 設備之方法； (3 )控制平均加熱速度爲在3 3 0 °C /秒以下，較 200°C /以下之方法；及/或 (4 )進行分階段的加熱工作件之方法等。 其中，進行分階段的加熱工作件之方法是包括 加熱工作件之步驟係由將熱壓用鋼板之溫度以1至 範圍的所需時間自室溫起進行加熱至溫度τ 1 ’（ °C 驟a ;其次，以1至5秒之範圍的所需時間Γ (秒 度T1’（°C)起進行加熱至溫度T2’（°C)之步驟t 件通電 加熱。 :例如 所形成 作件至 熱工作 生皮膜 〇 下進行 之排氣 佳爲在 :例如 1 0秒之 )之步 )自溫 心及接 -12- 201131015 著，以1至1 〇秒之範圍的所需時間自溫度Τ2 ’（ °c )起進 行加熱至溫度T2 ( °C )之步驟c所構成之方法等。此時， 較佳的是溫度Tl’（°C )及溫度T2’（°C )爲在300至500 °C之範圍、而以（T2’-T1 ’）/t’之式所計算得之値（在步驟b 中之平均加熱速度）爲在-20至20 °C/秒之範圍。藉由在加 熱工作件之步驟中設置步驟b，即可抑制驟然發生的源於 皮膜之分解而產生可燃性氣體等。 感應加熱方式之具體實例是包括：例如將工作件放入 於配備高頻電流會流通的加熱線圈之感應式加熱裝置而以 加熱線圈所產生的磁場來使得工作件產生渦電流以加熱至 8 00至1 200°C之溫度的加熱工作件之方式等。 其次，關於藉由使用含有黏合劑與金屬塡充劑之塗布 材料而在鋼板形成皮膜以獲得使用於本發明的工作件之方 法說明如下。 使用於本發明之加熱方法的工作件是可藉由習知的方 法，例如可根據日本發明專利特表2009-518471號公報、 特表200 8 - 5 1 6 02 3號公報、國際公開第2007/076769號小 冊子、國際公開第2009/〇21489號小冊子等中所揭述之方 法等而獲得。欲獲得使用於本發明之加熱方法的工作件之 具體方法是包括：例如將含有黏合劑與金屬塡充劑之塗布 材料塗布於鋼板之表面，其次，藉由將該鋼板在200至350 °C下進行加熱1至600秒以在該鋼板形成皮膜之方法等。 -13- 201131015 〔塗布材料〕 該塗布材料是含有黏合劑與金屬 屬塡充劑在塗布材料中的含量之總和 ’較佳爲5 〇至1 〇 〇質量％。在此，所 意謂作爲使用該塗布材料所形成之皮 成分’而「固體成分含量」是意謂相 體成分總量之質量百分率。 (黏合劑） 黏合劑是包括有機高分子、矽烷 砍氧樹脂等。在此所謂「矽烷水解產 矽烷水解產物及矽烷縮合物」或「矽 合物」。 塗布材料中之黏合劑的含量，以 佳爲1 0至9 0質量。/〇。 有機高分子是包括：例如聚胺基 脂、環氧樹脂、醇酸樹脂、酚樹脂、 酸酯樹脂、聚醚樹脂、氟樹脂等。 矽烷水解產物/縮合物是可藉由 水解、或將該矽烷類加以縮合而獲得 如烷氧基矽烷等。 「院氧基砂院」是包括：例如， 四烷氧基矽烷、芳基三烷氧基矽烷、 等。「烷基三烷氧基矽烷」是包括： 塡充劑。黏合劑與金 ，以固體成分含量計 謂的「固體成分」是 膜而殘留於鋼板上之 對於塗布材料中的固 水解產物/縮合物、聚 物/縮合物」是意謂〃 烷水解產物或矽烷縮 固體成分含量計，較 甲酸酯樹脂、聚酯樹 三聚氰胺樹脂、丙烯 例如經將矽烷類加以 。矽烷類是包括：例 烷基三烷氧基矽烷、 芳烷基三烷氧基矽烷 例如，甲基三甲氧基 -14- 201131015 矽烷、甲基三乙氧基矽烷等。四烷氧基矽烷是包括：例如 ，四甲氧基矽烷、四乙氧基矽烷、四丙氧基矽烷等。「芳 基三烷氧基矽烷」是包括：例如，三甲氧基苯基矽烷、三 甲氧基（對甲苯基）矽烷等。「芳烷基三烷氧基矽烷」是 包括：例如，苯甲基三乙氧基矽烷等。烷氧基矽烷是除了 如上所例示者以外，也包括：例如3-縮水甘油氧基丙基三 甲氧基矽烷、3-縮水甘油氧基丙基三乙氧基矽烷等之具有 縮水甘油基者等。 欲獲得矽烷水解產物/縮合物之具體方法是包括：例 如在甲酸等弱有機酸的存在下，將含有至少一種烷基三烷 氧基矽烷及至少一種四烷氧基矽烷之混合物加以水解而獲 得矽烷水解產物之方法’將該矽烷水解產物加以縮合之方 法等。 聚矽氧樹脂爲具有以-（SiO)n -所代表之重複結構單 兀者（有機聚砂氧院）’也包含經聚酯、丙稀酸酯、環氧 化物等加以改質之聚砂氧樹脂’且適合溶解於溶劑來使用 。溶劑是包括醇類、酯類、醚類、烴類（例如苯）等，其 中較佳爲具有超過23°C的燃點之溶劑。溶劑之具體實例是 包括：例如丁二醇、丁醇、甲氧基_2_丙醇等。 (金屬塡充劑） 金屬塡充劑是包括：例如金屬顏料等。金屬顏料是包 括：例如含W A卜Z„、Mg、Fe' Sn或含有此等中至少一 者之合金（例如Zn、A1 &amp; Mg之合金等）之金屬顏料等。 -15- 201131015 塗布材料中之金屬塡充劑的含量，以固體成分含量計 ’較佳爲1 〇至9 〇質量％。 (其他成分） 塗布材料較佳爲含有金屬氧化物及/或非金屬氧化物 粒子。該粒子是包括：例如A10 Ο Η (水鋁石）、剛玉 '氧 化锆、Si〇2、Ti〇2等之粒子。 塗布材料較佳爲含有固體潤滑劑。其係因爲工作件之 熱加工性及冷加工性將趨於良好的緣故。固體潤滑劑是包 括：例如’蠟、硬脂酸酯、石墨、M〇S2、氮化硼、氧化鋁 、二氧化鈦、層狀顏料（例如雲母等）等， 塗布材料可含有一般的流變學添加物、例如觸變性劑 、調平劑等。 (較佳的塗布材料之具體實例） 塗布材料之具體實例是包括：習知的塗布材料、例如 在日本發明專利特表第2008-516023號公報、特表第 2009-5丨8471號公報等中所揭述之塗布材料等。 更具體而言，例如NANO-X公司（NANO-X GmbH )製 造之VPC043 74等。 〔鋼板〕 鋼板是只要其爲以鋼鐵作爲材料之薄板時，則並無特 殊限制，可因應用途而選擇具有適當的特性者（薄板鋼板 )0 鋼板之形狀可爲板狀者或捲筒狀者。 鋼板之厚度較佳爲0.5至5mm。 -16- 201131015 從薄板鋼板之製造方法的觀點，則可使用例如熱延鋼 板、冷軋鋼板等。 從成分的觀點，可使用例如碳鋼（普通鋼）、合金鋼 (特殊鋼）、鎳鉻鋼、鎳鉬鋼、鉻鋼、鉻鉬鋼、錳鋼等。 更具體而言’例如碳爲0.1至0.5質量％、矽爲0.01至2 質量％、錳爲0.1至3質量％、磷爲0.1質量％以下、硫爲 0.05質量％以下 '氮爲0.01質量。/。以下、鉻爲0.01至5質 量％、硼爲0.0002至0.01質量％、鈦爲0.01至1質量％、 鋁爲0.005至1質量％、鎳爲0.01至3質量％、剩餘部分爲 鐵及不可避免的雜質的組成之鋼板等。 從表面處理的觀點，其包括：例如未經表面處理鋼板 ，經施加熱浸鍍鋅、電鍍辞、熱浸鍍鋁、熱浸鍍鋁鋅合金 、熱浸鍍鋅鋁鎂合金等鏟金屬層之鋼板等。也可使用對如 前所述經施加鑛金屬層之鋼板再施加鉻酸鹽處理所獲得之 鋼板。 在對如前所述鋼板進行塗布塗布材料之前，也可將該 鋼板之表面經化學處理或物理處理加工。若將該鋼板之表 面經化學處理或物理處理加工時，則有抑制在熱壓時之氧 化皮層形成的功效等。 所謂的「化學處理」是用於藉由將該鋼板與含有酸或 其鹽的水溶液接觸而將鋼板表面加以化學性處理者，具體 而言，例如將該鋼板在溫度爲1 0至80°C、PH4以下之酸性 水溶液中浸漬歷時1至1〇〇分鐘之處理等。 -17- 201131015 並且’經該處理後，較佳爲以純水洗滌鋼板表面，其 後則以***等來乾燥附著在該表面的純水。 此時’酸性水溶液之溫度較佳爲2 0 °C以上，更佳爲5 0 °C以上。 此外’酸性水溶液中之酸濃度較佳爲0 · 1至4 0質量％ ，更佳爲1至20質量％，進一步更佳爲5至15質量％。 此外，酸性水溶液之pH較佳爲4以下，更佳爲2以下 〇 此外，在酸性水溶液中浸漬鋼板之時間較佳爲3 0至 80分鐘，更佳爲50至70分鐘。 酸或其鹽是包括：例如，硫酸、鹽酸、硝酸、磷酸、 胺磺酸、氫氟酸等之無機酸；甲酸、草酸、檸檬酸、蘋果 酸、羥基醋酸、葡萄糖酸、甲烷磺酸等之有機酸；磷酸鋅 、硝酸鋅等。此等之中較佳爲磷酸、甲烷磺酸。 所謂的「物理處理」是意謂以物理性方式處理如前所 述鋼板之表面者，具體而言，例如以機械性方式硏磨處理 該鋼板之表面等。以機械性方式硏磨之處理是包括：例如 藉由磨床等機械硏磨、藉由砂紙硏磨等。在機械性方式硏 磨處理較佳爲將該鋼板之表面加以硏磨約0.5至ΙΟμηι。硏 磨時所使用之硏磨材較佳爲使用超過60號（JIS R 6010: 2000 )的細粒度之硏磨材。若使用超過60號的磨料時，則 可更適度地硏磨鋼板之表面使得皮膜形成後之皮膜外觀更 佳。 -18- 201131015 〔工作件〕 使用於本發明之加熱方法的工作件，例如在鋼板上塗 布塗布材料，隨後將經塗布塗布材料的鋼板加以加熱即可 獲得。 在鋼板上塗布塗布材料之方法是包括：例如使用噴槍 等之噴霧塗布、輥式塗布、流動塗布、刮刀式塗布、印刷 塗布、浸漬塗布（陰極浸漬塗布等）等之濕式塗布法等。 將經塗布塗布材料的鋼板加熱之方法是包括：例如紅 外線照射方式、熱風循環方式、電阻加熱方式、電子射線 硬化等。 製造使用於本發明之加熱方法的工作件之具體方法是 包括：例如藉由熱風循環方式等將經塗布塗布材料的鋼板 在200至35〇°C，唪佳爲在25〇至35〇°C之範圍的溫度下進 行加熱1至600秒，較佳爲5至60秒之方法等。 若藉由使用短波長紅外線的紅外線照射方式進行加熱 該鋼板時，由於加熱該鋼板之時間可以更短時間即可結束 ，從生產性的觀點，則爲較佳。藉由使用短波長紅外線的 紅外線照射方式進行加熱該鋼板時，較佳爲自室溫起至250 至3 5 0 °C之範圍的溫度爲止，以3至6 0秒之所需時間進行 加熱經塗布塗布材料的鋼板，更佳爲自室溫起至270至350 °C之範圍的溫度爲止，以3至1 5秒之所需時間進行加熱。 -19- 201131015 〔熱壓方法及熱壓成型品〕 本發明之熱壓方法是包括：以本發明之熱壓用鋼板之 加熱方法進行加熱工作件而獲得經加熱的工作件之步驟； 及將該經加熱的工作件加以成形，並將經成形的工作件加 以驟冷之步驟。具體而言，例如藉由本發明之熱壓用鋼板 之加熱方法將工作件加熱至Ac3變態點以上，其次，將經 加熱的工作件以金屬模加以成形，並將經成形的工作件以 該金屬模加以驟冷而獲得熱壓成型品之方法等。藉由本發 明之熱壓方法即可獲得電阻爲低之（例如在厚度方向之電 阻爲5ιηΩ以下）熱壓成型品等。 本發明之熱壓成型品由於在厚度方向之電阻爲低，具 有優異的點熔接性等優異特性。因此，可在不必移除熔接 部之皮膜下對本發明之熱壓成型品進行熔接。 此外，本發明之熱壓成型品可在不必移除皮膜下對該 成型品施加磷酸鹽處理及/或電著塗布。將磷酸鹽處理及/ 或電著塗布電著塗布於本發明之熱壓成型品其係可使用於 例如支柱構件、門柱等之汽車構件等。 《實施例》 茲將本發明之實施例及參考例說明如下。 熱風循環式（H A C : Η 〇 t A i r C i r c u 1 a t i n g t y p e )乾燥裝 置是使用 AdvantecMFS，Inc·製造之 DRLF23WA。 短波長紅外線爐是使用在爐內之上部與下部具有6個 燈模組（3.5kW)之 Adphos 公司（Adphos Innovative Technologies GmbH)製造之加熱爐。 -20- 201131015 長波長紅外線爐是使用Denko公司（Denko Co., Ltd. )製造之加熱爐。 電阻加熱裝置是使用中央製作所公司（Chuo Seisakusho Ltd.)製造之加熱裝置。 《製造例1》使用於實施例1至4、6至9及參考例1之工 作件 準備鋼板（l〇〇mmx200mm、厚度爲1.4mm)。將鋼板 之表面使用經浸漬於石油本精之布加以擦乾淨，其次以鹼 洗淨液及純水依照此順序洗滌鋼板。其後使用***乾燥鋼 板。 在經乾燥的鋼板之兩面以噴槍塗布塗布材料〔ΝΑΝΟ-X 公司製造之VP C04 374 (黏合劑；矽烷水解產物/縮合物、 金屬塡充劑；A 1 )〕。此時，則以噴槍調節所塗布的塗布 劑之量使得工作件之皮膜的膜厚達到吾所欲之厚度。 藉由將經塗布塗布材料的鋼板使用熱風循環式乾燥裝 置進行加熱而分別獲得使用於實施例1至4 ' 6至9及參考 例1之工作件。此時之加熱條件（溫度及時間）如表1所 示。其中’以HAC獲得工作件時的加熱條件之溫度是表示 裝置內的環境氣體之溫度。表2亦相同。 在下文中，有時候則將使用於實施例1之工作件稱爲 「工作件1」。使用於其他實施例號碼之工作件亦相同。 在下文中，則將使用於參考例1之工作件稱爲「工作 件1 r」。 -21- 201131015 《製造例2》使用於實施例5之工作件（工作件5 ) 以與獲得製造例1之工作件1相同的方法，在鋼板上 塗布塗布劑。 在與該短波長紅外線爐中的燈模組之距離爲5 cm之處 設置經塗布塗布劑之該鋼板。藉由從該鋼板之上下照射短 波長紅外線，自室溫起至2 7 5 °C爲止以5秒之所需時間進 行加熱該鋼板而獲得工作件5。 使用電磁感應式膜厚計（電磁膜厚計LE-3 70、Kett科 學硏究所公司（Kett Electric Laboratory)製造）測定工作 件1至9及lr之皮膜的膜厚。結果如表1所示。 〈實施例1至9及參考例1〉 其次’將工作件1至9及1 r之各自以如表1所示之加 熱方式，自室溫起至如表1所示之溫度T2爲止進行加熱， 並在工作件之溫度到達該溫度T 2時，則立即將工作件在水 中加以驟冷以獲得各製品。在自室溫起至該溫度T2進行加 熱工作件時，則將工作件之溫度自室溫到達該溫度T2爲止 的所需時間加以測定，同時觀察在加熱中有否發生皮膜之 分解燃燒。在實施例1至9及參考例1中之加熱方式（FIR 、ERH或NIR)、溫度T2及所需時間係如表1所示。溫度 T2是代表在工作件的鋼板部分之溫度。 關於在實施例1至9及參考例中，自室溫起至該溫度 T2爲止進行加熱的操作說明如下。 -22- 201131015201131015 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a heating method of a steel sheet for hot pressing, and the like. [Prior Art] In recent years, awareness of environmental issues such as global warming, air pollution, and depletion of fossil fuels has increased. As a result, the car has evolved to strongly demand vehicles that contribute greatly to improving fuel consumption and reducing c 0 2 . Light weight. Among them, a technique for reducing the weight of a vehicle body while considering the collision safety by increasing the strength of the steel sheet used for automobiles has been progressing. Representatives of these technologies are hot pressed. Hot pressing is a method in which a steel sheet is heated to about 800 to about 1200 ° C for austenite transformation, followed by forming a steel sheet using a metal mold and quenching it to transform it into a martensite phase. The method. A high-strength molded article can be obtained by hot pressing. At the time of hot pressing, when the steel sheet is heated and the heated steel sheet is formed and quenched, iron oxide (scale) is formed on the surface of the steel sheet. Therefore, in order to remove the scale layer formed on the surface of the molded article, it is generally the step of spraying high pressure water on the surface or applying a bead shot or the like. However, due to the increase in the number of processes, the cost of time and money increases. Therefore, it has been a review of a steel sheet for hot pressing which suppresses the formation of an oxide layer. A steel sheet for hot press which is formed by suppressing the formation of an oxide layer is disclosed in Patent Document 1 for an alloyed hot-dip galvanized steel sheet. However, in order to manufacture the -4 - 201131015 alloy hot dip shovel zinc steel plate, it is necessary to heat the hot dip mirror zinc steel plate at 550 to 650 ° C. Patent Document 2 discloses a steel sheet for hot pressing having a film formed by using a coating material containing a binder and a metal cerium. This steel sheet for hot pressing can be easily obtained by applying the coating material as described above to a steel sheet and heating the steel sheet. However, when the steel sheet for hot pressing is held at 950 ° C for 4 minutes, and then it is molded and quenched to obtain a hot-pressed product, the spot weldability of the molded article is not sufficiently satisfactory. [Technical Problem of the Invention] [Technical Problem to be Solved] [Technical Problem to be Solved] [Invention of the Invention] Patent Document 1 Japanese Patent Application Laid-Open No. 2003- 1 2692 No. Publication No. 2009-021489 The object of the invention is to provide a method for heating a steel sheet for hot pressing, which has a hot-pressing steel sheet having a coating film formed by using a coating material containing a binder and a metal cerium, and has excellent spot welding with high productivity. Sex and other advantages. [Technical method for solving the problem] The present invention provides the following inventions (1) to (20). (1) A method for heating a steel sheet for hot pressing, comprising: a temperature T1 (° C.) ranging from room temperature to 350 ° C to a temperature T 2 ( ° C ) in a range of 800 to 1200 ° C, The required time t of the range of 1 to 120 seconds (-5 - 201131015 seconds) is a step of heating a steel sheet for hot pressing having a film formed using a coating material containing a binder and a metal cerium. (2) The heating method of the hot-pressed steel sheet according to the above item (1), which comprises heating from the temperature T 1 ( t ) to the temperature T2 ( t ) at the required time t (second) The step of hot pressing the steel sheet. (3) The method for heating a hot-pressed steel sheet according to the above item (1), comprising: from the temperature T1 (°C) to the temperature 12 (1), at the required time t (seconds) The step of heating the steel sheet for hot pressing; secondly, the step of heating the steel sheet for hot pressing at a temperature of 800 to 120 CTC; and the total time required is 2 to 120 seconds. The heating method of the hot-pressed steel sheet according to any one of the above items (1) to (3), wherein the enthalpy calculated by the formula (T2-Tl)/t is 10 to 3 3 Range of 0 °C / sec. (5) The method for heating a steel sheet for hot pressing according to any one of the above items (1) to (4), wherein the temperature T1 is room temperature. (6) The method for heating a steel sheet for hot pressing according to any one of the above items (1) to (5), wherein the temperature T2 is in the range of 840 to 1000 °C. (7) The method for heating a steel sheet for hot pressing according to any one of the above items (1) to (6), wherein the required time t is 3 seconds or longer. (8) The method for heating a steel sheet for hot pressing according to any one of the above items (1) to (7), wherein the required time t is 80 seconds or less. The heating method of the hot-pressing steel sheet according to any one of the above-mentioned items (1) to (8), which is heated by resistance heating, and the hot-pressed steel sheet (10) is as described above. The method for heating a steel sheet for hot pressing according to item (5), wherein the steel sheet for hot pressing is heated by resistance heating, wherein the step of: heating the steel sheet for hot pressing to a temperature of from 1 to 10 seconds The required time is raised from the temperature τ 1 ( t ) to the temperature τ 1, ( °c ) step a; secondly, the required time for the temperature of the hot-pressed steel sheet in the range of 1 to 5 seconds (seconds) The temperature T1'(t) is raised to a temperature T2' (°C) step b; secondly, the temperature of the hot-pressed steel sheet is in a range of 1 to 10 seconds from the temperature T2, (°C) Warming up to temperature T2 ('. (:) step c: and the temperature T1' and the temperature Τ '2, in the range of 300 to 500 °c, and by (Τ2'-Τ1') / Γ The calculated enthalpy is in the range of _2 〇 to 2 〇t 〇 (11) The heating method for the hot-pressed steel sheet according to the above item (9) or (10), wherein the hot-pressed steel sheet is in its thickness direction (12) A method of heating a steel sheet for hot pressing according to any one of the above items (1) to (8), wherein the steel sheet for hot pressing is heated by infrared irradiation. The method for heating a steel sheet for hot pressing according to any one of the above items (1) to (12), wherein the binder contains an organic polymer (such as the above items (1) to (12). The method for heating a hot-pressed steel sheet according to any one of the preceding claims, wherein the binder is a decane hydrolyzate/condensate or a polysand oxide resin. (15) A heating method for a hot-pressed steel sheet according to the above item (14) The steel sheet for hot pressing is carried out by a steel sheet coated with a coating material containing a binder and a metal cerium at a temperature ranging from room temperature to a temperature in the range of 250 to 350 ° C for 3 to 60 seconds. The method for heating a steel sheet for hot pressing according to any one of the above items (1) to (15), wherein the metal cerium agent contains a material selected from the group consisting of Al, Zn, Mg, Fe, Sn or at least one of the alloys comprising at least one of the foregoing. (17) as in the above items (1) to (16) A method for heating a steel sheet for hot pressing, which is to heat the steel sheet for hot pressing under an ambient gas of a non-oxidizing gas. (18) A method for hot pressing, comprising: as in the above (1) to The method for heating a hot-pressed steel sheet according to any one of the items (17), wherein the hot-pressed steel sheet is obtained by using a hot-pressed steel sheet formed by using a coating film containing a binder and a metal chelating agent. And a step of forming the heated hot-pressed steel sheet and quenching the formed hot-pressed steel sheet. (19) A hot press molded article' obtained by a hot pressing method as described in the above (is). -8-201131015 (20) The method for producing a hot-pressed product, comprising: heating the steel sheet for hot pressing according to any one of the items (1) to (17) The hot-pressed steel sheet is obtained by forming a hot-pressed steel sheet for forming a hot-pressing steel sheet with a coating material of a metal chelating agent, and forming the heated hot-pressing steel sheet, and quenching the formed steel sheet for forming The steps. [Effects of the Invention] According to the present invention, it is possible to provide a hot-pressing steel sheet, etc., which has a high-pressure steel sheet which can be formed from a film having a film formed by using a binder-containing metal lining material. The advantage of obtaining a hot-pressed product having a different spot weldability. [Embodiment] [Best Mode for Carrying Out the Invention] [Method for Heating Steel Sheet for Hot Pressing] The heating method for steel sheet for hot pressing according to the present invention includes: from room temperature to temperature C of temperature C (°c) to 800 Temperature 1200 ° C T2 (°c, heating at a required time t (seconds) in the range of 1 to 120 seconds. The steel sheet for hot pressing is formed by using a coating material containing a binder and a metal chelating agent. The step, and the total time required is in the range of 1 to 1 2 0. Specifically, it includes, for example, the step of transporting the hot-pressed steel sheet to the later step, followed by 8〇 The method of heating the steel sheet for hot pressing to the temperature of ° C, preferably by the thermal method of the step of feeding as described above, is preferably a method of coating the second step of the film 1200. The method formed by 201131015. After the hot-pressed steel sheet is conveyed to the step, the total time required to heat the hot-pressed steel sheet at a temperature of from 800 to 1,200 ° C is preferably in the range of from 2 to 120 seconds. . When the heating method of the hot-pressed steel sheet according to the present invention is used, since the time required for heating the hot-pressed steel sheet by hot pressing can be shortened, the hot pressing method of the present invention including the heating method can be used. Highly productive to obtain hot pressed products. · Specific examples of the step for heating the hot-pressed steel sheet include: for example, the steel sheet for hot pressing at room temperature (for example, a temperature of -10 to 40 ° C) or heated to 350 ° C or lower The heating method such as the infrared irradiation method or the resistance heating method is a step of heating to a temperature of 800 to 1 200 ° C for a required time of 1 second or longer and shorter than 120 seconds. The steel sheet for hot pressing which is heated to 350 ° C or lower also includes, for example, a steel sheet which is formed by coating a steel sheet at a temperature of 35 ° C or lower and coating the steel sheet as described above with a coating material. Inside. Hereinafter, a steel sheet for hot pressing having a film formed using a coating material containing a binder and a metal chelating agent is sometimes referred to as a "work". In the heating method of the present invention, the step for heating the working member (hereinafter, sometimes referred to simply as the step of heating the working member) may be under an ambient gas of a non-oxidizing gas of nitrogen or argon or under the atmosphere. get on. In the step of heating the workpiece, from the temperature Tl(t) to the temperature T2 (°C), when the workpiece is heated for the required time t (seconds), it is preferable that the -10-201131015 is (T2-Tl). The enthalpy calculated by the formula /t is in the range of 10 to 3 30 ° C / sec. In the following, sometimes the enthalpy calculated by the formula (T2-Tl)/t is referred to as "average heating rate". The step of increasing the average heating rate means that it is a step of heating the workpiece for a shorter time required. Preferably, the step of heating the workpiece is such that the required time t is in the range of 3 seconds to 80 seconds, more preferably in the range of 3 seconds to 30 seconds, still more preferably in the range of 3 seconds to 10 seconds. The heating method used in the step of heating the working piece includes, for example, an infrared ray irradiation method, an electric resistance heating method (ERH), an induction heating method, etc., and the infrared ray irradiation method includes, for example, a method using a short-wavelength infrared ray (NIR), and a medium wavelength. Infrared mode, long-wavelength infrared (FIR), etc. Specific examples of the infrared irradiation method include, for example, heating the temperature inside the furnace of a long-wavelength infrared furnace having a long-wavelength infrared heater device to a temperature of 800 to 1200 ° C, and then placing the workpiece in the furnace to heat the workpiece. In the manner of placing the workpiece in a short-wavelength infrared oven equipped with a short-wavelength infrared lamp module and irradiating the workpiece with a short-wavelength infrared ray to heat the workpiece to a temperature of 800 to 1200 °C, etc. . Specific examples of the resistance heating method include, for example, a method of heating the workpiece to a temperature of 800 to 1200 ° C by holding the both ends of the workpiece and energizing the workpiece. When the workpiece is heated by the resistance heating method, it is preferable to remove the film of the portion where the electrode and the workpiece are to be contacted in advance, or to use a workpiece having a resistance of 1 Ω or less in the thickness direction. By using a work piece having a resistance of 1 Ω or less in the thickness direction of -11-201131015, it is possible to suppress the portion where the electrode is in contact with the workpiece at the time of operation, and the resistance in the thickness direction is preferably 0.5 Ω or less. . The work piece having a resistance of 1 Ω or less in the thickness direction is a work piece including a film having a film thickness of 5 μm or less, which is a coating material using VPC 〇 43 74 manufactured by Sigma-Aldrich Co., Ltd. In addition, the resistance heating method is very fast and can be used to heat the desired degree. When the temperature is applied to the temperature of 800 to 1200 C by means of resistance heating, it is possible to cause decomposition combustion during heating. From the viewpoint of safety, a method for heating the workpiece more safely to avoid this phenomenon includes, for example, (1) a method of heating a working member in an ambient gas of a non-oxidizing gas of nitrogen or argon: (2) a device for heating a working piece to locally set a device such as an exhaust gas; (3) controlling the average heating rate to be below 3 30 ° C / sec, which is more than 200 ° C / below; and / or (4) A method of heating the work piece in stages, and the like. Wherein, the method of heating the working piece in stages comprises the step of heating the working piece by heating the temperature of the hot-pressing steel plate from room temperature to a temperature τ 1 ' from a room temperature of 1 to (° C a Secondly, the step t of heating to the temperature T2' (°C) is performed in the range of 1 to 5 seconds (seconds T1' (°C). The exhaust of the working film under the armpit is preferably: for example, 10 seconds) from the temperament and the -12-201131015, the required time in the range of 1 to 1 sec. °c) A method consisting of the step c of heating to a temperature T2 (°C). In this case, it is preferred that the temperature T1' (°C) and the temperature T2' (°C) are in the range of 300 to 500 ° C and calculated as (T2'-T1 ')/t'.値 (average heating rate in step b) is in the range of -20 to 20 ° C / sec. By providing step b in the step of heating the workpiece, it is possible to suppress the sudden occurrence of flammable gas or the like due to decomposition of the film. Specific examples of the induction heating method include, for example, placing the workpiece in an induction heating device equipped with a heating coil through which a high-frequency current flows to heat the magnetic field generated by the coil to cause an eddy current to heat the workpiece to 800 00. The method of heating the workpiece to a temperature of 1 200 ° C, and the like. Next, a method of forming a film on a steel sheet by using a coating material containing a binder and a metal chelating agent to obtain a working member used in the present invention will be described below. The working member used in the heating method of the present invention can be obtained by a conventional method, for example, according to Japanese Patent Laid-Open Publication No. 2009-518471, No. 200 8 - 5 1 6 02 3 , International Publication No. 2007 It is obtained by the method disclosed in the booklet No. /076769, the pamphlet of International Publication No. 2009/〇21489, and the like. A specific method for obtaining a working member used in the heating method of the present invention includes, for example, applying a coating material containing a binder and a metal cerium to a surface of a steel sheet, and secondly, by using the steel sheet at 200 to 350 ° C A method of heating for 1 to 600 seconds to form a film on the steel sheet, or the like. -13- 201131015 [Coating material] The coating material is a total of the content of the binder and the metal chelating agent in the coating material, preferably '5 〇 to 1 〇 〇 by mass. Here, the term "solid content" as the skin component formed by using the coating material means the mass percentage of the total amount of the phase component. (Binder) The binder includes an organic polymer, a decane chopping resin, and the like. Here, "the decane hydrolyzed decane hydrolyzate and the decane condensate" or "complex" are referred to. The content of the binder in the coating material is preferably from 10 to 90% by mass. /〇. The organic polymer includes, for example, a polyamine resin, an epoxy resin, an alkyd resin, a phenol resin, an acid ester resin, a polyether resin, a fluororesin or the like. The decane hydrolyzate/condensate can be obtained by hydrolysis or by condensing the decane such as alkoxy decane. The "housing oxygen sand chamber" includes, for example, a tetraalkoxynonane, an aryltrialkoxide, and the like. "Alkyltrialkoxydecane" is intended to include: oxime. The binder and gold, the "solid content" in terms of the solid content is a film and the solid hydrolyzate/condensate, polymer/condensate in the coating material remains on the steel sheet means decane hydrolyzate or The content of the decane-condensed solid component is higher than that of the formate resin, the polyester melamine resin, and the propylene, for example, by decane. The decanes include, for example, alkyltrialkoxydecane, aralkyltrialkoxydecane, for example, methyltrimethoxy-14-201131015 decane, methyltriethoxydecane, and the like. The tetraalkoxydecane includes, for example, tetramethoxynonane, tetraethoxydecane, tetrapropoxydecane, and the like. The "aryltrialkoxynonane" includes, for example, trimethoxyphenylnonane, trimethoxy(p-tolyl)nonane, and the like. The "aralkyltrialkoxynonane" includes, for example, benzyltriethoxydecane or the like. The alkoxy decane includes, in addition to the above, a glycidyl group such as 3-glycidoxypropyltrimethoxydecane or 3-glycidoxypropyltriethoxysilane. . A specific method for obtaining a decane hydrolysate/condensate comprises: hydrolyzing a mixture containing at least one alkyl trialkoxy decane and at least one tetraalkoxy decane, for example, in the presence of a weak organic acid such as formic acid. A method of condensing a decane hydrolysate, a method of condensing the decane hydrolyzate, and the like. The polyoxyxene resin is a polycrystalline sand having a repeating structure represented by -(SiO)n - (organic polyoxalate) and also containing polyester, acrylate, epoxide, etc. The oxy resin is suitable for use in dissolving in a solvent. The solvent is an alcohol, an ester, an ether, a hydrocarbon (e.g., benzene), etc., and a solvent having a flash point exceeding 23 °C is preferred. Specific examples of the solvent include, for example, butylene glycol, butanol, methoxy-2-propanol and the like. (Metal Tanning Agent) The metal cerium filling agent includes, for example, a metallic pigment or the like. The metal pigment includes, for example, a metal pigment containing WA, Z, Mg, Fe' Sn, or an alloy containing at least one of these (for example, an alloy of Zn, Al, Mg, etc.) -15- 201131015 Coating material The content of the metal ruthenium agent is preferably from 1 〇 to 9 〇 by mass based on the solid content. (Other components) The coating material preferably contains metal oxide and/or non-metal oxide particles. It includes, for example, particles of A10 Ο Η (aluminum), corundum zirconia, Si 〇 2, Ti 〇 2, etc. The coating material preferably contains a solid lubricant because of the hot workability and cold working of the workpiece. The properties will tend to be good. Solid lubricants include, for example, 'wax, stearate, graphite, M〇S2, boron nitride, aluminum oxide, titanium dioxide, layered pigments (such as mica, etc.), coating materials It may contain a general rheological additive such as a thixotropic agent, a leveling agent, etc. (Specific examples of preferred coating materials) Specific examples of the coating material include: a conventional coating material, for example, a Japanese invention patent Table No. 2008-516 More specifically, for example, a coating material such as VPC043 74 manufactured by NANO-X GmbH (NANO-X GmbH), etc. When it is a thin plate made of steel as a material, there is no particular limitation, and it is possible to select an appropriate characteristic depending on the application (thin plate steel). The shape of the steel plate may be a plate shape or a roll shape. It is preferably from 0.5 to 5 mm. -16- 201131015 From the viewpoint of the method for producing a thin steel plate, for example, a heat-expanded steel plate, a cold-rolled steel plate, or the like can be used. From the viewpoint of composition, for example, carbon steel (ordinary steel) or alloy steel can be used. (special steel), nickel-chromium steel, nickel-molybdenum steel, chrome steel, chrome-molybdenum steel, manganese steel, etc. More specifically, 'for example, carbon is 0.1 to 0.5% by mass, cerium is 0.01 to 2% by mass, and manganese is 0.1 to 3% by mass, phosphorus is 0.1% by mass or less, sulfur is 0.05% by mass or less, and nitrogen is 0.01% by mass. The following, chromium is 0.01 to 5% by mass, boron is 0.0002 to 0.01% by mass, and titanium is 0.01 to 1% by mass. , aluminum is 0.005 to 1% by mass, nickel is 0.01 to 3% by mass, and the remainder A steel sheet composed of iron and inevitable impurities. From the viewpoint of surface treatment, it includes, for example, a surface-treated steel sheet, hot-dip galvanizing, electroplating, hot-dip aluminizing, hot-dip aluminum-zinc plating A steel plate such as an alloy, a hot-dip galvanized aluminum-magnesium alloy, or the like, and a steel plate obtained by subjecting a steel plate to which a mineral metal layer is applied as described above to a chromate treatment. The surface of the steel sheet may be subjected to chemical treatment or physical treatment before the application of the coating material. When the surface of the steel sheet is subjected to chemical treatment or physical treatment, the effect of suppressing the formation of the scale layer during hot pressing may be performed. . The "chemical treatment" is used to chemically treat the surface of the steel sheet by contacting the steel sheet with an aqueous solution containing an acid or a salt thereof. Specifically, for example, the steel sheet is at a temperature of 10 to 80 ° C. The treatment is carried out in an acidic aqueous solution of pH 4 or lower for 1 to 1 minute. -17- 201131015 and After the treatment, it is preferred to wash the surface of the steel sheet with pure water, and thereafter dry the pure water adhering to the surface with an air gun or the like. At this time, the temperature of the acidic aqueous solution is preferably 20 ° C or higher, more preferably 50 ° C or higher. Further, the acid concentration in the acidic aqueous solution is preferably from 0.1 to 40% by mass, more preferably from 1 to 20% by mass, still more preferably from 5 to 15% by mass. Further, the pH of the acidic aqueous solution is preferably 4 or less, more preferably 2 or less. Further, the time for immersing the steel sheet in the acidic aqueous solution is preferably from 30 to 80 minutes, more preferably from 50 to 70 minutes. The acid or a salt thereof is, for example, an inorganic acid such as sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, aminesulfonic acid or hydrofluoric acid; formic acid, oxalic acid, citric acid, malic acid, hydroxyacetic acid, gluconic acid, methanesulfonic acid or the like. Organic acid; zinc phosphate, zinc nitrate, etc. Among these, phosphoric acid and methanesulfonic acid are preferred. The term "physical treatment" means that the surface of the steel sheet as described above is physically treated, and specifically, for example, the surface of the steel sheet is mechanically honed and the like. The treatment by mechanical honing includes, for example, mechanical honing by a grinding machine, honing by sandpaper, and the like. In the mechanical honing treatment, it is preferred to honing the surface of the steel sheet by about 0.5 to ΙΟμηι. The honing material used in the honing is preferably a fine-grained honing material using No. 60 (JIS R 6010: 2000). If more than 60 abrasives are used, the surface of the steel sheet can be more moderately tempered so that the appearance of the film after film formation is better. -18- 201131015 [Working member] The working member used in the heating method of the present invention is obtained, for example, by coating a coating material on a steel sheet and then heating the steel sheet coated with the coating material. The method of applying the coating material to the steel sheet includes, for example, a wet coating method such as spray coating using a spray gun, roll coating, flow coating, blade coating, printing coating, dip coating (cathodic dip coating, etc.). The method of heating the steel sheet coated with the coating material includes, for example, an infrared irradiation method, a hot air circulation method, a resistance heating method, an electron beam curing, and the like. A specific method for producing a working member for use in the heating method of the present invention includes, for example, coating the coated steel sheet by a hot air circulation method or the like at 200 to 35 ° C, preferably 25 to 35 ° C. Heating at a temperature in the range of 1 to 600 seconds, preferably 5 to 60 seconds, or the like. When the steel sheet is heated by infrared irradiation using short-wavelength infrared rays, the time for heating the steel sheet can be completed in a shorter period of time, which is preferable from the viewpoint of productivity. When the steel sheet is heated by infrared irradiation using short-wavelength infrared rays, it is preferably heated from a room temperature to a temperature in the range of 250 to 350 ° C for 3 to 60 seconds. The steel sheet of the coating material is preferably heated from room temperature to a temperature in the range of 270 to 350 ° C for 3 to 15 seconds. -19-201131015 [Hot-pressing method and hot-pressed product] The hot-pressing method of the present invention comprises the steps of: heating a working piece by the heating method of the hot-pressed steel sheet of the present invention to obtain a heated working piece; The heated workpiece is shaped and the formed workpiece is quenched. Specifically, for example, the workpiece is heated to above the Ac3 metamorphic point by the heating method of the hot-pressed steel sheet of the present invention, and second, the heated workpiece is formed by a metal mold, and the formed workpiece is made of the metal. The mold is quenched to obtain a method of hot press molding. According to the hot pressing method of the present invention, a hot-pressed product having a low electric resistance (e.g., a resistance in the thickness direction of 5 ηηΩ or less) can be obtained. The thermoformed article of the present invention has excellent electrical properties such as excellent spot weldability because of its low electrical resistance in the thickness direction. Therefore, the thermoformed article of the present invention can be welded under the film which does not require removal of the welded portion. Further, the thermoformed article of the present invention can apply phosphate treatment and/or electrocoating to the molded article without removing the film. The electroformed product of the present invention can be applied to a hot-pressed product of the present invention by a phosphate treatment and/or an electrocoating, and can be used for an automobile member such as a pillar member, a door post or the like. <<Embodiment>> Embodiments and reference examples of the present invention will be described below. The hot air circulation type (H A C : Η 〇 t A i r C i r c u 1 a t i n g t y p e ) was a DRLF 23WA manufactured by Advantec MFS, Inc. The short-wavelength infrared ray furnace is a heating furnace manufactured by Adphos Innovative Technologies GmbH having six lamp modules (3.5 kW) in the upper and lower portions of the furnace. -20- 201131015 The long-wavelength infrared oven is a heating furnace manufactured by Denko Co., Ltd. The electric resistance heating device was a heating device manufactured by Chuo Seisakusho Ltd. "Manufacturing Example 1" was used for the work of Examples 1 to 4, 6 to 9 and Reference Example 1 to prepare a steel sheet (l 〇〇 mm x 200 mm, thickness 1.4 mm). The surface of the steel sheet was wiped clean with a cloth immersed in petroleum spirit, and the steel sheet was washed in this order with an alkali washing liquid and pure water. The steel plate was then dried using an air gun. The coating material (VP C04 374 (adhesive; decane hydrolyzate/condensate, metal ruthenium; A 1 ) manufactured by ΝΑΝΟ-X Company) was applied by a spray gun on both sides of the dried steel sheet. At this time, the amount of the applied coating agent is adjusted by the lance to make the film thickness of the working member reach the desired thickness. The working members used in Examples 1 to 4' 6 to 9 and Reference Example 1 were respectively obtained by heating the steel sheets coated with the coating material using a hot air circulation type drying device. The heating conditions (temperature and time) at this time are shown in Table 1. The temperature at which the heating condition when the workpiece is obtained by the HAC is the temperature of the ambient gas in the apparatus. Table 2 is also the same. Hereinafter, the working piece used in the embodiment 1 is sometimes referred to as "work piece 1". The work pieces used in other embodiment numbers are also the same. Hereinafter, the work piece used in Reference Example 1 is referred to as "work piece 1 r". -21-201131015 "Production Example 2" used in the working piece of Example 5 (Working member 5) A coating agent was applied to the steel sheet in the same manner as the working piece 1 of Production Example 1. The steel sheet coated with the coating agent was placed at a distance of 5 cm from the lamp module in the short-wavelength infrared oven. The workpiece 5 was obtained by heating the steel sheet from the room temperature to 275 ° C for 5 seconds from the room temperature by irradiating the short-wavelength infrared rays from above and below the steel sheet. The film thickness of the coatings of the working members 1 to 9 and 1r was measured using an electromagnetic induction type film thickness meter (electromagnetic film thickness meter LE-3 70, manufactured by Kett Electric Laboratory). The results are shown in Table 1. <Examples 1 to 9 and Reference Example 1> Next, each of the workpieces 1 to 9 and 1 r was heated from room temperature to a temperature T2 as shown in Table 1 by a heating method as shown in Table 1. And when the temperature of the workpiece reaches the temperature T 2 , the workpiece is immediately quenched in water to obtain each article. When the heating member is heated from room temperature to the temperature T2, the temperature of the workpiece is measured from the room temperature to the temperature T2, and it is observed whether or not the decomposition combustion of the film occurs during heating. The heating modes (FIR, ERH or NIR), temperature T2 and required time in Examples 1 to 9 and Reference Example 1 are shown in Table 1. The temperature T2 represents the temperature of the steel plate portion of the workpiece. In the examples 1 to 9 and the reference examples, the operation of heating from the room temperature to the temperature T2 will be described below. -22- 201131015

〈在實施例1、2及6至9之加熱操作〉FIR 將長波長紅外線爐之爐內溫度升溫成如表1所示&amp; ^ 度後，將藉由製造例1所獲得之室溫的工作件放入該Μ φ ，並在大氣環境氣體中進行加熱，直至工作件之溫度達至 如表1所示之溫度T2爲止。<The heating operation in Examples 1, 2 and 6 to 9> FIR The room temperature of the long-wavelength infrared furnace was raised to the temperature shown in Table 1, and the room temperature obtained by the production example 1 was obtained. The workpiece is placed in the Μ φ and heated in an atmosphere of the atmosphere until the temperature of the workpiece reaches the temperature T2 as shown in Table 1.

〈在實施例3之加熱操作〉ERH 以配備於電阻加熱裝置之兩個電極分別挾住X丨乍(牛3 之兩端，其次，藉由在大氣環境氣體中對工作件3進行通 電，並自室溫起至900°C爲止以9秒之所需時間進行加熱 工作件3。<The heating operation in the embodiment 3> ERH is held by the two electrodes provided in the resistance heating device, respectively, at the ends of the cow 3, and secondly, by energizing the workpiece 3 in the atmosphere gas, and The work piece 3 was heated for a period of 9 seconds from room temperature to 900 °C.

〈在實施例4之加熱操作〉ERH 以配備於電阻加熱裝置之兩個電極分別挾住工作件4 之兩端，其次在大氣環境氣體中對工作件4進行通電，並 自室溫起至9 5 0 °C爲止以6秒之所需時間進行分階段的加 熱工作件4。其時，則將工作件4之溫度以3秒之所需時 間自室溫起升溫至3 5 〇 °C，其次以2秒之所需時間自3 5 〇 起升溫至380°C〔此時（T2’-T1，）/t’是計算得爲1 5°C /秒）〕 ，其次則以1秒之所需時間自3 8 0 °C起升溫至9 5 0 °C。 〈在參考例1之加熱操作〉E R Η 以配備於電阻.加熱裝置之兩個電極分別挾住工作件1 Γ 之兩端，其次在大氣環境氣體中對室溫的工作件lr進行通 電2秒而使工作件1 r加熱至7 3 (TC時，工作件1 r之鋼板的 一部分熔融’且工作件1 r之皮膜則分解燃燒。 -23- 201131015 工作件lr之鋼板的一部分會熔融之原因爲：由於使$ 厚度方向的電阻爲超過1Ω之工作件，對工作件進行通儀時 則導致電極與工作件所相接觸之部分受到極度的加熱@ ^ 故。 工作件lr之皮膜會分解燃燒之原因爲：由於平均力口# 速度爲如3 5 3。(： /秒之高，源於皮膜之分解的可燃性氣體# 則急劇發生的緣故。<Heat Operation in Embodiment 4> ERH The two electrodes provided in the resistance heating device respectively hold the both ends of the workpiece 4, and then the working member 4 is energized in the atmospheric environment gas, and from room temperature to 95. The staged heating work piece 4 is carried out at a temperature of 0 ° C for 6 seconds. At this time, the temperature of the workpiece 4 is raised from room temperature to 3 5 〇 ° C for 3 seconds, and then the temperature is raised from 3 5 380 to 380 ° C for 2 seconds (at this time ( T2'-T1,)/t' is calculated to be 15 °C / sec), and then the temperature is raised from 890 °C to 950 °C in the required time of 1 second. <The heating operation in Reference Example 1> ER Η The two electrodes provided in the resistance heating device are respectively clamped on both ends of the working member 1 ,, and then the room temperature working member lr is energized in the atmospheric atmosphere for 2 seconds. When the working piece 1 r is heated to 7 3 (TC, part of the steel plate of the working piece 1 r is melted) and the film of the working piece 1 r is decomposed and burned. -23- 201131015 The part of the steel plate of the working piece lr is melted. Therefore, since the resistance in the thickness direction is a working piece exceeding 1 Ω, when the working piece is passed through, the portion where the electrode and the working piece are in contact is extremely heated. The working film lr is decomposed and burned. The reason is that the average force port # speed is as high as (3:3). (: / / second, the flammable gas # derived from the decomposition of the film occurs sharply.

〈在實施例5之加熱操作〉NIR 在與該短波長紅外線爐中的燈模組之距離爲5 cm 2胃 設置工作件5。藉由從工作件5之上下照射短波長紅外線 ，自室溫起至95 (TC爲止以27秒之所需時間進行加熱工作 件5。 (皮膜之分解燃燒） 在實施例1至9中·，自室溫起至如表1所示之溫度T2 爲止進行加熱工作件1至9時，並未發生皮膜之分解燃燒 〇 (電阻） 將藉由實施例1至9所獲得製品之厚度方向的電阻（ 在下文中，則簡稱爲「電阻」）加以測定。 以兩個電極（Cu_Cr、M16x8A)將製品由兩面挾住， 然後測定以3 · 5 kN之加壓力加壓兩電極’並使一定的直流 電流（Ic )流通時之電壓（V!)，且以下式計算出：<Heating operation in Example 5> NIR The working member 5 was set at a distance of 5 cm 2 from the lamp module in the short-wavelength infrared oven. By irradiating the short-wavelength infrared rays from above and below the workpiece 5, the workpiece 5 is heated from room temperature to 95 (TC is required for 27 seconds. (Decomposition combustion of the film). In Examples 1 to 9, When the temperature was raised to the temperature T2 as shown in Table 1, when the workpieces 1 to 9 were heated, no decomposition of the film occurred (resistance) resistance in the thickness direction of the article obtained by Examples 1 to 9 (under In the text, it is simply referred to as "resistance". The product is clamped on both sides by two electrodes (Cu_Cr, M16x8A), and then the two electrodes are pressed at a pressure of 3 · 5 kN to make a certain direct current ( Ic) The voltage at the time of circulation (V!), and the following formula is calculated:

Ri〔 ιηΩ〕= Vi〔 mV〕/Ic〔 A〕 -24- 201131015 (但是，在本測定試驗中，則爲I c = 1〔 A〕。）。 測定製品之任意5處的電阻，並以此等之算術平均値 作爲製品之電阻。結果如表1所示。 《製品之電著塗布》 (試驗試樣1之製造） 前處理：經將以實施例 1所獲得製品以 SURFCLEANER DP400 (曰本塗料公司（Nippon Paint Co.， Ltd.)製造）、SURFCLEANER53(日本塗料公司製造）及 SURFFINE 5N-1 0 (曰本塗料公司製造）依照此順序進行處 理後，藉由在45 °C下歷時 2分鐘浸漬於磷酸鋅處理液 SURFDINE DP4000 C日本塗料公司製造）而進行該製品之 前處理。 基底塗層塗布：使用SUCCED#8V (杜邦-神東塗料公 司（DuPont-Shinto Paint Co·，Ltd.)製造）在 28〇C、以 210V 進行通電而對經前處理的該製品施加電著塗布，並藉由將 經電著塗布的該製品在190°C下烘培乾燥20分鐘而獲得試 驗試樣1。在該製品上所形成的電著塗膜之膜厚爲約20 μιη 0 (試驗試樣6至9之製造） 藉由對實施例6至9所獲得製品之各個進行下列前處 理及基底塗層塗布而分別獲得試驗試樣6至9。 目I[處理：將製品之表面以FC-E20〇l(日本Parkerizing 公司（Nihon Parkerizing Co.，Ltd.)製造）、pl-ZTH (曰 -25- 201131015 本Par keri zing公司製造）依照此順序進行處理後，藉由在 磷酸鋅處理液WL-；35(日本Parkerizing公司製造）在35 t下浸潰2分鐘而進行該製品之前處理。 基底塗層塗布：使用GT-10HT(關西塗料公司（Kansai Paint Co.，Ltd.)製造）在25 °C、210V下進行通電而對經 前處理的該製品施加電著塗布，並藉由將經電著塗布的該 製品在1 70°C下烘培乾燥20分鐘而獲得試驗試樣。在該製 品上所形成的電著塗膜之膜厚爲約20μπι。 (附著性試驗1 )Ri[ ιηΩ] = Vi[ mV]/Ic [ A] -24- 201131015 (However, in the measurement test, I c = 1 [A].). The resistance of any five places of the article is measured, and the arithmetic mean of this is used as the resistance of the article. The results are shown in Table 1. "Electrical Coating of Products" (Production of Test Sample 1) Pretreatment: The product obtained in Example 1 was SURFCLEANER DP400 (manufactured by Nippon Paint Co., Ltd.), SURFCLEANER 53 (Japan) After being processed in this order, the coating company (manufactured by Paint Co., Ltd.) and SURFFINE 5N-1 0 (manufactured by Sakamoto Co., Ltd.) were immersed in a zinc phosphate treatment liquid (SURFDINE DP4000 C Japan Paint Co., Ltd.) at 45 ° C for 2 minutes. The product was previously treated. Subcoat layer coating: Electrocoating was applied to the pretreated product at 28 ° C using a SUCCED #8V (manufactured by DuPont-Shinto Paint Co., Ltd.) at 210 V. Test Sample 1 was obtained by baking the electrocoated coated article at 190 ° C for 20 minutes. The film thickness of the electrocoat film formed on the article was about 20 μm 0 (manufacture of test samples 6 to 9). The following pretreatments and base coats were carried out by each of the articles obtained in Examples 6 to 9. Test samples 6 to 9 were obtained by coating. Item I [Treatment: The surface of the product was in the order of FC-E20〇l (manufactured by Nihon Parkerizing Co., Ltd.), pl-ZTH (曰-25-201131015 manufactured by Par keri zing company). After the treatment, the preparation of the product was carried out by immersing in a zinc phosphate treatment liquid WL-; 35 (manufactured by Japan Parkerizing Co., Ltd.) at 35 t for 2 minutes. Substrate coating: Electroless coating was applied to the pretreated article by energization at 25 ° C, 210 V using GT-10HT (manufactured by Kansai Paint Co., Ltd.), and The electrocoated coated article was baked and dried at 1 70 ° C for 20 minutes to obtain a test sample. The film thickness of the electrocoat film formed on the product was about 20 μm. (Adhesion test 1)

使用試驗試樣1及6至9,並根據棋盤格膠黏帶法（JIS Κ 5400-8-5 -2 )之準則進行評估對製品的電著塗膜之附著性 〇 在試驗試樣之塗膜面使用割刀以1 mm間隔畫痕1 1條 到達鋼板質地的切痕後，方向改爲90。而再畫痕1 1條lmm 見方之棋盤格狀（方格數=100)切痕。將賽璐玢膠帶貼附 於經畫痕的塗膜面，並以橡皮擦拭使得膠帶密著於塗膜， 使膠帶密著後，經1分鐘後則持膠帶的一端並在保持著朝 塗膜面成直角之狀態瞬間加以剝離。然後，計數塗膜未被 剝離而殘留的方格數。 結果如表3所示。 (附著性試驗2 ) ' 使用將試驗試樣1及6至9分別浸漬於40°C蒸餾水歷 時5 00小時者，以如附著性試驗1所揭述之方法進行評估 對製品的電著塗膜之附著性。結果如表3所示。 -26- 201131015 (抗蝕性試驗） 根據汽車用材料腐蝕試驗方法（JASOM609-91)之準 則進行評估試驗試樣1之抗鈾性。 藉由以對試驗試樣1依序進行（1 )至（3 )之操作作 爲一循環而進行合計6 0循環’以評估試驗試樣1之抗蝕性 〔（1 )鹽水噴霧2小時（35°C、5%NaCl水溶液）；（2 )乾燥4小時（6 0 °C、相對濕度爲2 0至3 0 % ) ； ( 3 )濕 潤2小時（50°C、95%RH以上）〕。 使用ASTM D6 10-85所揭述之方法，以目視評估經抗 蝕性試驗後的試驗試樣1之銹蝕的發生，結果則爲少於 0.01%。 使用ASTM D7 14-87所揭述之方法，以目視評估經抗 蝕性試驗後的試驗試樣1之塗膜.膨脹的發生，結果在該試 驗試樣1並未觀察到膨脹的發生。 由抗蝕性試驗之結果，可明白試驗試樣1之抗蝕性爲 良好。 《工作件之皮膜特性》 《製造例3》工作件2r 除了取代自室溫起至2 7 5 °C爲止以5秒之所需時間進 行加熱經塗布塗布劑之鋼板，而以自室溫起至20(TC爲止 以3秒之所需時間進行加熱以外，其餘則進行與製造例2 相同的方法而獲得工作件2r。工作件2r之皮膜的膜厚是以 與工作件1之相同的方法進行測定。 -27- 201131015 就工作件5、1 r及2r進行皮膜之附著性試驗、耐化學 藥品性試驗及硬度試驗。 (皮膜之附著性試驗） 關於工作件5、1 r及2 r，以附著性試驗1所揭述之方 法進行評估對鋼板的皮膜之附著性。結果如表2所示。 (耐化學藥品性試驗） 將布浸漬於二甲苯’對該布施加60 g/cm2之荷重，並 以最多1〇〇反複擦拭工作件5、lr或2r之表面。以鋼板露 出時之次數（設擦拭「一來回」爲1次）進行評估皮膜之 耐化學藥品性。結果如表2所示。表2中，1 0 0 +是意謂經 以該布擦1 〇〇次後，工作件之鋼板並未露出。 (硬度試驗） 根據畫痕硬度（鉛筆法）（JISK5600-5-4: 1999)之 準則進行評估皮膜之硬度。 使用 6B、5B、4B、3B、2B、B、HB、F、Η、2H、3 Η 、4Η、5Η、6Η、7Η或8Η之硬度的鉛筆，將工作件5、lr 或2r之皮膜進行畫痕5次，然後以目視觀察有無傷痕。 在表2中之「皮膜特性」之「皮膜硬度」欄中是表示 經畫痕而受傷時的鉛筆之硬度（但是，8 Η +是意謂即使以 8Η之鉛筆進行畫痕也未受傷。）。 -28- 201131015 表1 實施例 1 2 3 4 5 颇 之 形成 加熱方式 HAC HAC HAC HAC NIR 溫度rc) 250 250 250 250 275 時間（秒） 600 600 600 600 5 膜厚（μη〇 7 3 3 3 7 工作件 之 加熱 加熱方式· FIR FIR ERH ERH NIR 溫度Τ2 (。〇 950 950 950 950 950 時間（秒） 46 48 9 6 27 平均加熱速度（°c/秒） 20 19 103 154 34 Μ品 電阻（ιηΩ) 2 1 2 2 2 表1 (續） 實Si m 參考例 6 7 8 9 1 皮膜 之 形成 加熱方式 HAC HAC HAC HAC HAC 溫度（。〇 250 250 250 250 250 時間（秒） 600 600 600 600 600 膜厚（μπι) 5 5 5 9 7 工作件 之 加熱 加熱方式 FIR FIR FIR FIR ERH ΜΤ2 CC) 950 900 850 950 730 時間（秒） 49 68 62 47 2 平均加熱速度rc渺） 19 13 13 20 353 製品 電阻（ηιΩ) 1 1 1 2 — 在實施例1、2及6至9中，以FIR將具有膜厚爲3、 5' 7或9μπι之皮膜的工作件，自室溫起至850、900或950 °C爲止以46至68秒之範圍的所需時間進行加熱。在實施 例1、2及6至9中所計算得之平均加熱速度爲在13至20 °C /秒之範圍。其次，藉由將該工作件之各個立即在水中加 以驟冷而獲得電阻分別爲1或2ιηΩ的製品。 在實施例3中，以ERH將具有膜厚爲3 μιη之皮膜的工 作件，自室溫起至9 5 0 °C爲止以9秒之所需時間進行加熱 。此時之平均加熱速度是計算得爲1 03 °C /秒。其次，藉由 將該工作件之各個立即在水中加以驟冷而獲得電阻爲2ηιΩ 的製品。 -29- 201131015 在實施例4中，以ERH將具有膜厚爲3 μιη之皮膜的工 作件，自室溫起至950°C爲止以6秒之所需時間進行分階 段的加熱。此時之平均加熱速度是計算得爲154 °C/秒。其 次，藉由將該工作件之各個立即在水中加以驟冷而獲得電 阻爲2ιηΩ的製品。 在實施例5中，以NIR將具有膜厚爲7μπι之皮膜的工 作件，自室溫起至95 0 °C爲止以27秒之所需時間進行加熱 。此時之平均加熱速度是計算得爲34°C /秒。其次，藉由將 該工作件之各個立即在水中加以驟冷而獲得電阻爲2ιηΩ的 製品。 以實施例1至9所獲得製品之電阻降低爲1或2πιΩ。 其係表示以實施例1至9所獲得製品是具有優異的點熔接 性。 表2Test specimens 1 and 6 to 9 were used, and the adhesion to the electrocoating film of the product was evaluated according to the rule of the checkerboard adhesive tape method (JIS Κ 5400-8-5 -2 ). The film surface was cut with a cutter at a spacing of 1 mm to reach a cut of the steel plate texture, and the direction was changed to 90. And then draw 1 1 lmm square checkerboard (squares = 100) cuts. Attach the celluloid tape to the painted film surface and wipe it with a rubber tape so that the tape is adhered to the film. After the tape is adhered, after one minute, the tape is held at one end and kept on the film. The surface is peeled off at a right angle. Then, the number of squares in which the coating film was not peeled off was counted. The results are shown in Table 3. (Adhesion test 2) 'When the test samples 1 and 6 to 9 were respectively immersed in distilled water at 40 ° C for 500 hours, the electrocoating of the product was evaluated by the method as disclosed in Adhesion Test 1. Adhesion. The results are shown in Table 3. -26- 201131015 (Anti-corrosion test) The uranium resistance of test sample 1 was evaluated according to the guidelines for corrosion test of materials for automobiles (JASOM609-91). The corrosion resistance of the test sample 1 was evaluated by performing the operations of (1) to (3) on the test sample 1 in sequence as a cycle to evaluate the corrosion resistance of the test sample 1 [(1) salt spray for 2 hours (35 °C, 5% NaCl aqueous solution); (2) drying for 4 hours (60 ° C, relative humidity of 20 to 30%); (3) wetting for 2 hours (50 ° C, 95% RH or more)]. The occurrence of rust of the test sample 1 after the corrosion resistance test was visually evaluated by the method disclosed in ASTM D6 10-85, and as a result, it was less than 0.01%. The film of the test sample 1 after the corrosion resistance test. The occurrence of swelling was visually evaluated by the method disclosed in ASTM D7 14-87, and as a result, no occurrence of swelling was observed in the test sample 1. As a result of the corrosion resistance test, it was found that the corrosion resistance of the test sample 1 was good. "Film Characteristics of Workpieces" "Production Example 3" Workpiece 2r A steel sheet coated with a coating agent is heated for a period of 5 seconds from the room temperature to 275 ° C, and is from room temperature to 20 The workpiece 2r was obtained by the same method as in Production Example 2 except that the heating was performed for 3 seconds. The film thickness of the workpiece 2r was measured in the same manner as the workpiece 1. -27- 201131015 Adhesion test, chemical resistance test and hardness test of the film 5, 1 r and 2r. (Adhesion test of the film) About the work pieces 5, 1 r and 2 r, to adhere The method disclosed in the test 1 evaluated the adhesion to the film of the steel sheet. The results are shown in Table 2. (Chemical resistance test) The cloth was immersed in xylene to apply a load of 60 g/cm 2 to the cloth. The surface of the working piece 5, lr or 2r was repeatedly rubbed with a maximum of 1 。. The chemical resistance of the film was evaluated by the number of times the steel plate was exposed (the wipe was "one round trip"). The results are shown in Table 2. In Table 2, 1 0 0 + means the passage of the cloth After 1 〇〇, the steel plate of the work piece is not exposed. (Hardness test) The hardness of the film is evaluated according to the criteria of the hardness of the mark (pencil method) (JISK5600-5-4: 1999). Use 6B, 5B, 4B, 3B, 2B, B, HB, F, Η, 2H, 3 Η, 4Η, 5Η, 6Η, 7Η or 8Η hardness of the pencil, the work piece 5, lr or 2r film is painted 5 times, and then visually In the "film hardness" column of "film properties" in Table 2, the hardness of the pencil when it is injured by the drawing is shown (however, 8 Η + means that even if the pencil is drawn with 8 inches of pencil Not injured.) -28- 201131015 Table 1 Example 1 2 3 4 5 Formation heating method HAC HAC HAC HAC NIR Temperature rc) 250 250 250 250 275 Time (seconds) 600 600 600 600 5 Film thickness (μη〇 7 3 3 3 7 Heating and heating of working parts · FIR FIR ERH ERH NIR Temperature Τ 2 (. 〇950 950 950 950 950 Time (seconds) 46 48 9 6 27 Average heating speed (°c/sec) 20 19 103 154 34电阻 resistance (ιηΩ) 2 1 2 2 2 Table 1 (continued) Real Si m Reference Example 6 7 8 9 1 Film Heating method HAC HAC HAC HAC HAC temperature (. 250 250 250 250 250 time (seconds) 600 600 600 600 600 film thickness (μπι) 5 5 5 9 7 heating and heating method of the workpiece FIR FIR FIR FIR ERH ΜΤ 2 CC) 950 900 850 950 730 Time (seconds) 49 68 62 47 2 Average heating rate rc渺) 19 13 13 20 353 Product resistance (ηιΩ) 1 1 1 2 — In Examples 1, 2 and 6 to 9, with FIR The workpiece having a film thickness of 3, 5' 7 or 9 μm is heated from room temperature to 850, 900 or 950 ° C for a desired time in the range of 46 to 68 seconds. The average heating rate calculated in Examples 1, 2 and 6 to 9 was in the range of 13 to 20 ° C / sec. Next, an article having a resistance of 1 or 2 ηηΩ was obtained by immediately quenching each of the working members in water. In Example 3, a work having a film having a film thickness of 3 μm was heated by ERH at a temperature of from 9 to 90 ° C for 9 seconds. The average heating rate at this time was calculated to be 1 03 ° C / sec. Next, an article having a resistance of 2ηιΩ was obtained by immediately quenching each of the working members in water. -29-201131015 In the fourth embodiment, a workpiece having a film thickness of 3 μm was heated by ERH in a stepwise heating period from room temperature to 950 ° C for 6 seconds. The average heating rate at this time was calculated to be 154 ° C / sec. Next, an article having a resistance of 2 ηηΩ was obtained by immediately quenching each of the working members in water. In Example 5, a work having a film having a film thickness of 7 μm was heated by NIR from room temperature to 95 ° C for 27 seconds. The average heating rate at this time was calculated to be 34 ° C / sec. Next, an article having a resistance of 2 ηηΩ was obtained by immediately quenching each of the working members in water. The electrical resistance of the articles obtained in Examples 1 to 9 was reduced to 1 or 2 π Ω. It is shown that the articles obtained in Examples 1 to 9 have excellent spot weldability. Table 2

工作件 5 lr 2r 加熱方式 NIR HAC NIR 溫度rc) 275 250 200 時間（秒） 5 600 3 膜厚（&quot;m) 7 7 7 皮膜之附著性試驗 100 100 100 耐化學藥品性試驗 100+ 100+ 3 硬度試驗 8H+ 8H+ 2H 將以HAC塗布塗布材料所獲得鋼板在25 0°C之環境氣 體下進行加熱600秒所獲得工作件1 r之皮膜是顯現優異的 附著性、優異的耐化學藥品性及優異的硬度。 將鋼板自室溫起至2 7 5 t爲止以5秒之所需時間進行 加熱所得工作件5之皮膜，其係顯現優異的附著性、優異 -30- 201131015 的耐化學藥品性及優異的硬度；其中該鋼板係以NIR塗布 塗布材料所得。 將鋼板自室溫起至2 0 0 °C爲止以3秒之所需時間進行 加熱所獲得工作件2 r之皮膜的耐化學藥品性及硬度是並不 足夠’其中該鋼板係以NIR塗布塗布材料所得。 在含有黏合劑與金屬塡充劑之塗布材料中，黏合劑是 使用含有矽烷水解產物/縮合物或聚矽氧樹脂者時，例如將 以NIR等塗布塗布材料的鋼板自室溫起至275 °c爲止以5 秒之所需時間進行加熱等，藉此可以短時間獲得具有優異 的附著性、優異的耐化學藥品性及優異的硬度之皮膜的工 作件。 表3 試驗試樣 1 6 7 8 9 附著性試驗1 100 100 100 100 100 附著性試驗2 100 100 100 100 100 試驗試樣1及6至9之附著性試驗1及附著性試驗2 之結果是全部爲1 〇〇。其係表示以實施例1及6至9所獲 得製品與電著塗膜之附著性爲優異》 〔產業上之利用可能性〕 藉由本發明，則可提供一種具有從經使用含有黏合劑 與金屬塡充劑之塗布材料所形成皮膜之熱壓用鋼板，以高 生產性獲得具有優異的點熔接性之熱壓成型品等之優點的 熱壓用鋼板之加熱方法等。 -3 1- 201131015 【圖式簡單說明】 迦。 ^ws 【主要元件符號說明 〇Working piece 5 lr 2r Heating method NIR HAC NIR Temperature rc) 275 250 200 Time (seconds) 5 600 3 Film thickness (&quot;m) 7 7 7 Film adhesion test 100 100 100 Chemical resistance test 100+ 100+ 3 Hardness test 8H+ 8H+ 2H The steel sheet obtained by coating the coating material with HAC is heated under ambient gas at 25 ° C for 600 seconds to obtain a coating of working piece 1 r which exhibits excellent adhesion and excellent chemical resistance. Excellent hardness. The film of the work piece 5 obtained by heating the steel sheet from room temperature to 27.5 volts for 5 seconds, which exhibits excellent adhesion, excellent chemical resistance of -30-201131015, and excellent hardness; Wherein the steel sheet is obtained by coating a coating material with NIR. The chemical resistance and hardness of the film of the working piece 2 r obtained by heating the steel plate from room temperature to 200 ° C for 3 seconds is not sufficient. The steel plate is coated with NIR coating material. Income. In a coating material containing a binder and a metal chelating agent, when a binder containing a decane hydrolyzate/condensate or a polyoxyxene resin is used, for example, a steel sheet coated with a coating material such as NIR is used from room temperature to 275 ° C. By heating or the like for 5 seconds, the workpiece having excellent adhesion, excellent chemical resistance, and excellent hardness can be obtained in a short time. Table 3 Test sample 1 6 7 8 9 Adhesion test 1 100 100 100 100 100 Adhesion test 2 100 100 100 100 100 Test results 1 and 6 to 9 adhesion test 1 and adhesion test 2 results are all It is 1 〇〇. It is shown that the adhesion between the product obtained in Examples 1 and 6 to 9 and the electrocoating film is excellent. [Industrial Applicability] By the present invention, it is possible to provide a binder and a metal from the use. A steel sheet for hot pressing of a film formed by a coating material of a sizing agent, a heating method for a hot-pressed steel sheet having an advantage of obtaining a hot-pressed product having excellent spot weldability, and the like with high productivity. -3 1- 201131015 [Simple description of the schema] Jia. ^ws [Main component symbol description 〇

Claims (1)

201131015 七、申請專利範圍： 1. 一種熱壓用鋼板之加熱方法，其包括：自室溫至350 °C之 範圍的溫度T1(°C )起至800至1200°C之範圍的溫度T2 (°C )爲止，以1至120秒之範圍的所需時間t (秒）進 行加熱具有經使用含有黏合劑與金屬塡充劑之塗布材料 所形成皮膜之熱壓用鋼板之步驟： 且所需時間之總計爲在1至1 20秒之範圍。 2. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其包 括自該溫度T1 ( °C )起至該溫度T2 ( °C )爲止，以該所 需時間t (秒）進行加熱該熱壓用鋼板之步驟。 3 .如申請專利範圍第1項之熱壓用鋼板之加熱方法，其包 括；自該溫度T1(°C)起至該溫度T2(°C)爲止，以該 所需時間t (秒）進行加熱該熱壓用鋼板之步驟； 其次，以800至1200 °C之溫度進行加熱該熱壓用鋼 板之步驟；且 所需時間之總計爲2至1 20秒。 4. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 以（T2-Tl)/t之式所計算得之値爲在10至3 3 0°C /秒之範圍 〇 5. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該溫度T1爲室溫。 6. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該溫度T2爲在840至1000 °C之範圍。 -33- 201131015 7 ·如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該所需時間t爲3秒以上。 8.如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該所需時間t爲8 0秒以下。 9 ·如申請專利範圍第1項之熱壓用鋼板之加熱方法，其係 以電阻加熱方式進行加熱該熱壓用鋼板。 10. 如申請專利範圍第5項之熱壓用鋼板之加熱方法，其係 以電阻加熱方式進行加熱該熱壓用鋼板， 該步驟是包括： 將該熱壓用鋼板之溫度以1至10秒之範圍的所需時 間自該溫度T1 ( °C )升溫至溫度T1 ’（ °C )之步驟a ; 其次，將該熱壓用鋼板之溫度以1至5秒之範圍的 所需時間t’（秒）自該溫度Tl’（ t )升溫至溫度T2’（ t：)之步驟b ; 其次，將該熱壓用鋼板之溫度，以1至10秒之範圍 的所需時間自該溫度T2 ’（ °C )升溫至該溫度T2 ( °C ) 之步驟c ;且 該溫度T1’及該溫度T2’爲在300至500 °c之範圍， 且以（T2’-T1 ’）/t’之式所計算得之値爲在-20至20°C /秒之 範圍。 11. 如申請專利範圍第9項之熱壓用鋼板之加熱方法，其中 該熱壓用鋼板是在其厚度方向之電阻爲1Ω以下之鋼板.。 -34- 201131015 12. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其係 以紅外線照射方式進行加熱該熱壓用鋼板。 13. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該黏合劑是含有有機高分子· ° 1 4 ·如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該黏合劑是含有矽烷水解產物/縮合物或聚矽氧樹脂。 15. 如申請專利範圍第14項之熱壓用鋼板之加熱方法，其 中該熱壓用鋼板是藉由將經塗布含有黏合劑與金屬塡充 劑之塗布材料之鋼板以自室溫起至250至3 5 0°C之範圍的 溫度爲止，以3至60秒之所需時間進行加熱而獲得者。 16. 如申請專利範圍第1項之熱壓用鋼板之加熱方法，其中 該金屬塡充劑含有選自Al、Zn、Mg、Fe、Sn或至少含有 此等中之一者的合金中之至少一者。 1 7 ·如申請專利範圍第1項之熱壓用鋼板之加熱方法，其係 在非氧化性氣體之氣體環境下加熱該熱壓用鋼板。 18· —種熱壓方法，其包括：以如申請專利範圍第1至17 項中任一項之熱壓用鋼板之加熱方法進行加熱具有經使 用含有黏合劑與金屬塡充劑之塗布材料所形成皮膜之熱 壓用鋼板而獲得經加熱之熱壓用鋼板之步驟，及 將該經加熱之熱壓用鋼板加以成形，並將經成形之 熱壓用鋼板加以驟冷之步驟。 1 9 · 一種熱壓成型品’其係以如申請專利範圍第1 8項之熱 壓方法而獲得 -35- 201131015 20.—種熱壓成型品之製造方法，其包括：以如申請專利範 圍第1至17項中任一項之熱壓用鋼板之加熱方法進行加 熱具有經使用含有黏合劑與金屬塡充劑之塗布材料所形 成皮膜之熱壓用鋼板而獲得經加熱之熱壓用鋼板之步驟 ，及 將該經加熱之熱壓用鋼板加以成形，並將經成形&amp; 熱壓用鋼板加以驟冷之步驟。 -36- 201131015 四、指定代表圖： (一) 本案指定代表圖為：無。 (二) 本代表圖之元件符號簡單說明： 無0 五、本案若有化學式時，請揭示最能顯示發明特徵的化學式：201131015 VII. Patent application scope: 1. A heating method for hot-pressed steel sheets, comprising: temperature T2 (°C) ranging from room temperature to 350 °C to temperature T2 (° range of 800 to 1200 °C) C) the step of heating the steel sheet for hot pressing having a film formed using a coating material containing a binder and a metal cerium for a desired time t (seconds) in the range of 1 to 120 seconds: and the required time The total is in the range of 1 to 1 20 seconds. 2. The method for heating a hot-pressed steel sheet according to the first aspect of the patent application, comprising heating from the temperature T1 (°C) to the temperature T2 (°C), and heating at the required time t (seconds) The step of hot pressing the steel sheet. 3. The method for heating a hot-pressed steel sheet according to the first aspect of the patent application, comprising: from the temperature T1 (°C) to the temperature T2 (°C), at the required time t (seconds) The step of heating the steel sheet for hot pressing; secondly, the step of heating the steel sheet for hot pressing at a temperature of 800 to 1200 ° C; and the total time required is 2 to 20 seconds. 4. For the heating method of the hot-pressed steel sheet according to Item 1 of the patent application, wherein the enthalpy calculated by the formula (T2-Tl)/t is in the range of 10 to 3 30 ° C / sec. The method for heating a hot-pressed steel sheet according to the first aspect of the invention, wherein the temperature T1 is room temperature. 6. The method of heating a hot-pressed steel sheet according to claim 1, wherein the temperature T2 is in the range of 840 to 1000 °C. -33-201131015 7 The heating method of the hot-pressed steel sheet according to the first aspect of the invention, wherein the required time t is 3 seconds or longer. 8. The method of heating a hot-pressed steel sheet according to the first aspect of the invention, wherein the required time t is 80 seconds or less. In the heating method of the hot-pressed steel sheet according to the first aspect of the patent application, the hot-pressed steel sheet is heated by resistance heating. 10. The method for heating a hot-pressed steel sheet according to claim 5, wherein the hot-pressing steel sheet is heated by a resistance heating method, the step comprising: heating the hot-pressing steel sheet at a temperature of 1 to 10 seconds The required time of the range is raised from the temperature T1 (°C) to the temperature T1 '(°C) step a; secondly, the temperature of the hot-pressed steel sheet is required to be in the range of 1 to 5 seconds t' (second) step b from the temperature T1'(t) to the temperature T2'(t:); secondly, the temperature of the hot-pressed steel sheet is from the temperature T2 in a range of 1 to 10 seconds '( ° C ) is heated to the temperature T2 ( ° C ) step c; and the temperature T1 ′ and the temperature T 2 ′ are in the range of 300 to 500 ° C, and (T2′-T1 ')/t' The enthalpy calculated by this formula is in the range of -20 to 20 ° C / sec. 11. The method for heating a hot-pressed steel sheet according to claim 9, wherein the hot-pressed steel sheet is a steel sheet having a resistance of 1 Ω or less in a thickness direction thereof. -34-201131015 12. The method for heating a hot-pressed steel sheet according to the first aspect of the patent application, which is characterized in that the hot-pressed steel sheet is heated by infrared irradiation. 13. The method for heating a hot-pressed steel sheet according to the first aspect of the invention, wherein the binder is a method for heating a steel sheet for hot pressing according to the first aspect of the patent application, wherein the binder is an organic polymer. The binder is a decane hydrolysate/condensate or a polyoxyxylene resin. 15. The method for heating a hot-pressed steel sheet according to claim 14, wherein the hot-pressed steel sheet is formed from a room temperature to 250 by applying a coating material containing a coating material containing a binder and a metal chelating agent The temperature is obtained in the range of 3 to 50 ° C, and is obtained by heating for 3 to 60 seconds. 16. The method of heating a hot-pressed steel sheet according to claim 1, wherein the metal ruthenium contains at least an alloy selected from the group consisting of Al, Zn, Mg, Fe, Sn, or at least one of the alloys. One. In the heating method of the hot-pressed steel sheet according to the first aspect of the patent application, the hot-pressed steel sheet is heated in a gas atmosphere of a non-oxidizing gas. 18. A method of hot pressing, comprising: heating by a heating method for a hot-pressed steel sheet according to any one of claims 1 to 17 having a coating material containing a binder and a metal chelating agent; The step of forming a steel sheet for hot pressing of a film to obtain a heated steel sheet for hot pressing, and forming the heated steel sheet for hot pressing, and quenching the formed steel sheet for hot pressing. 1 9 · A hot-pressed product obtained by the hot pressing method as claimed in claim 18-35-201131015 20. A method for producing a hot-pressed product, comprising: The heating method of the hot-pressed steel sheet according to any one of the items 1 to 17 is characterized in that the hot-pressed steel sheet is obtained by heating the steel sheet formed by using a coating material containing a binder and a metal cerium filler. And a step of forming the heated steel sheet for hot pressing and quenching the formed steel sheet for hot pressing. -36- 201131015 IV. Designated representative map: (1) The representative representative of the case is: None. (2) A brief description of the symbol of the representative figure: None 0. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: