JP2017507241A - 高強度鋼および製造方法 - Google Patents
高強度鋼および製造方法 Download PDFInfo
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- JP2017507241A JP2017507241A JP2016538514A JP2016538514A JP2017507241A JP 2017507241 A JP2017507241 A JP 2017507241A JP 2016538514 A JP2016538514 A JP 2016538514A JP 2016538514 A JP2016538514 A JP 2016538514A JP 2017507241 A JP2017507241 A JP 2017507241A
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- steel sheet
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- rolled
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
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- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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Abstract
Description
0.10≦C≦0.13%
2.4≦Mn≦2.8%
0.30≦Si≦0.55%
0.30≦Cr≦0.56%
0.020≦Ti≦0.050%
0.0020≦B≦0.0040%
0.005≦Al≦0.050%
Mo≦0.010%
Nb≦0.040%
0.002≦N≦0.008%
S≦0.005%
P≦0.020%
を含む化学組成を有し、残部が鉄および製錬に由来する不可避的不純物からなり、鋼板が表面存在比率においてマルテンサイトおよび/または下部ベイナイトからなるミクロ組織を有し、前記マルテンサイトがフレッシュマルテンサイトおよび/または自己焼戻しマルテンサイトを含み、表面存在比率の合計は、マルテンサイトおよび下部ベイナイトが60から95%の範囲、低炭化物含有ベイナイトが4から35%の範囲、フェライトが0から5%の範囲、およびアイランド形態の残留オーステナイトが5%未満である、鋼板に関する。
2.5≦Mn≦2.8%
を含む。
0.30≦Si≦0.5%
を含む。
0.005≦Al≦0.030%
を含む。
・含有率を重量%で表して:
0.10≦C≦0.13%
2.4≦Mn≦2.8%
0.30≦Si≦0.55%
0.30≦Cr≦0.56%
0.020≦Ti≦0.050%
0.0020≦B≦0.0040%
0.005≦Al≦0.050%
Mo≦0.010%
Nb≦0.040%
0.002≦N≦0.008%
S≦0.005%
P≦0.020%
を含む化学組成を有し、残部が鉄および製錬に由来する不可避的不純物からなる鋼半製品を準備する工程、次いで
・前記鋼半製品を1250℃以上の温度Treheatまで加熱する工程、次いで
・前記鋼半製品を熱間圧延し、最終圧延温度が冷却時のオーステナイト変態開始温度Ar3より高い温度となり、熱間圧延鋼板を得る工程、次いで
・フェライトおよびパーライトの形成を回避するのに十分な速度にて前記熱間圧延鋼板を冷却する工程、次いで
・前記熱間圧延鋼板を580℃未満の温度にてコイル状に巻き取る工程、次いで
・前記熱間圧延鋼板を冷間圧延し、冷間圧延鋼板を得る工程、次いで
・前記冷間圧延鋼板を、1から20℃/秒の範囲の加熱速度VRにて、600℃からAc1、すなわち加熱時のオーステナイト変態開始温度まで、再加熱する工程、次いで
・前記冷間圧延鋼板を、Ac3’=Min{Ac3+1200/Dm;1000℃}(式中、Ac3およびAc3’は摂氏で表され、Dmは秒で表され、Ac3は当該温度Ac3における保持時間から独立して求められる加熱時のオーステナイト変態終了温度を表す。)として、Ac3’−10℃からAc3’+30℃の範囲の温度Tmまで再加熱し、前記冷間圧延鋼板を50から150秒の範囲の時間Dmにわたり前記温度Tmにて保持する工程、次いで
・鋼板を10から150℃/秒の範囲の速度にて460℃から490℃の範囲の温度Teまで冷却する工程、次いで
・前記鋼板を5から150秒の範囲の時間にわたり温度Teにて保持する工程、次いで
・鋼板を、450℃から480℃の範囲の温度TZnにて、亜鉛または亜鉛合金槽に連続浸漬することにより、めっきする工程であって、前記温度TeおよびTZnは0≦(Te−TZn)≦10℃である、工程、次いで
・場合によって、めっきした鋼板を10秒から40秒の範囲の時間tGにわたり490℃から550°の範囲の温度まで加熱する工程
を含む、本発明による冷間圧延焼鈍鋼板の製造方法に関する。
・含有率を重量%で表して:
0.10≦C≦0.13%
2.4≦Mn≦2.8%
0.30≦Si≦0.55%
0.30≦Cr≦0.56%
0.020≦Ti≦0.050%
0.0020≦B≦0.0040%
0.005≦Al≦0.050%
Mo≦0.010%
Nb≦0.040%
0.002≦N≦0.008%
S≦0.005%
P≦0.020%
を含む化学組成を有し、残部が鉄および製錬に由来する不可避的不純物からなる鋼半製品を準備する工程、次いで
・前記鋼半製品を1250℃以上の温度Treheatまで加熱する工程、次いで
・前記鋼半製品を熱間圧延し、最終圧延温度がAr3より高い温度となり、熱間圧延鋼板を得る工程、次いで
・前記熱間圧延鋼板を、フェライトおよびパーライトの形成を回避するのに十分な速度にて冷却する工程、次いで
・前記熱間圧延鋼板を580℃未満の温度にてコイル状に巻き取る工程、次いで
・前記熱間圧延鋼板を冷間圧延し、冷間圧延鋼板を得る工程、次いで
・前記冷間圧延鋼板を、1から20℃/秒の範囲の加熱速度VRにて、600℃からAc1、すなわち加熱時のオーステナイト変態開始温度まで、再加熱する工程、次いで
・前記冷間圧延鋼板を、Ac3’=Min{Ac3+1200/Dm;1000℃}(式中、Ac3およびAc3’は摂氏で表され、Dmは秒で表され、Ac3は当該温度Ac3における保持時間から独立して求められる加熱時のオーステナイト変態終了温度を表す。)として、Ac3−10℃からAc3+30℃の範囲の温度Tmまで再加熱し、前記冷間圧延鋼板を50から150秒の範囲の時間Dmにわたり温度Tmにて保持する工程、次いで
・鋼板を10から100℃/秒の範囲の速度で460℃から490℃の温度Teに冷却する工程、次いで
・前記鋼板を、5から150秒の範囲の時間にわたり温度Teにて保持する工程、次いで
・前記鋼板を周囲温度まで冷却する工程
を含む、本発明による冷間圧延焼鈍鋼板の製造方法に関する。
Ceq=C+Mn/20+Si/30+P+S×2
を用いて計算される。
Ac1=739−22×C−7×Mn+2×Si+14×Cr+13×Mo−13×Ni
を用いて評定することができる。
Ms(℃)=539−423C−30.4Mn−17.7Ni−12.1Cr−11Si−7Mo
から求めた。
Claims (21)
- 冷間圧延焼鈍鋼板であって、その化学組成が、含有率を重量%で表して:
0.10≦C≦0.13%
2.4≦Mn≦2.8%
0.30≦Si≦0.55%
0.30≦Cr≦0.56%
0.020≦Ti≦0.050%
0.0020≦B≦0.0040%
0.005≦Al≦0.050%
Mo≦0.010%
Nb≦0.040%
0.002≦N≦0.008%
S≦0.005%
P≦0.020%
を含み、残部が鉄および製錬に由来する不可避的不純物からなり、冷間圧延焼鈍鋼板が表面存在比率においてマルテンサイトおよび/または下部ベイナイトからなるミクロ組織を有し、前記マルテンサイトがフレッシュマルテンサイトおよび/または自己焼戻しマルテンサイトを含み、表面存在割合の合計は、マルテンサイトおよび下部ベイナイトが60から95%の範囲、低炭化物含有ベイナイトが4から35%の範囲、フェライトが0から5%の範囲、およびアイランド形態の残留オーステナイトが5%未満である、冷間圧延焼鈍鋼板。 - 前記ミクロ組織が、表面存在比率で4%から20%、好ましくは4%から15%のフレッシュマルテンサイトを含むことを特徴とする、請求項1に記載の冷間圧延焼鈍鋼板。
- 前記ミクロ組織が、表面存在比率で40%から95%の自己焼戻しマルテンサイトおよび下部ベイナイトを含むことを特徴とする、請求項1に記載の冷間圧延焼鈍鋼板。
- 前記自己焼戻しマルテンサイトおよび前記下部ベイナイトが、マルテンサイトおよびベイナイトラスの<111>方位に配向した針状炭化物を含有することを特徴とする、請求項3に記載の冷間圧延焼鈍鋼板。
- 前記低炭化物含有ベイナイトが、100μm2の表面単位当り100個未満の炭化物を含有することを特徴とする、請求項1から4のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 前記ミクロ組織が、表面存在比率で4から5%のフェライトを含むことを特徴とする、請求項1から5のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 残留オーステナイトアイランドの最小寸法が50nm未満であることを特徴とする、請求項1から6のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 焼鈍によって生じた粒径1μm未満の旧オーステナイト結晶粒の分率が、前記旧オーステナイト結晶粒の総数の10%未満となることを特徴とする、請求項1から7のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 前記冷間圧延焼鈍鋼板が、1180MPaから1320MPaの範囲の引張強度、および40%以上の穴広げ率Ac%を有することを特徴とする、請求項1から8のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 前記冷間圧延焼鈍鋼板が0.7mmから1.5mmの範囲の厚さを有し、前記冷間圧延焼鈍鋼板が55°以上の曲げ角度を有することを特徴とする、請求項1から9のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 化学組成が、含有率を重量%で表して:
2.5≦Mn≦2.8%
を含むことを特徴とする、請求項1から10のいずれか一項に記載の冷間圧延焼鈍鋼板。 - 化学組成が、含有率を重量%で表して:
0.30≦Si≦0.5%
を含むことを特徴とする、請求項1から11のいずれか一項に記載の冷間圧延焼鈍鋼板。 - 化学組成が、含有率を重量%で表して:
0.005≦Al≦0.030%
を含むことを特徴とする、請求項1から12のいずれか一項に記載の冷間圧延焼鈍鋼板。 - 前記冷間圧延焼鈍鋼板が、連続浸漬めっきを通じて得られた亜鉛または亜鉛合金めっきを含むことを特徴とする、請求項1から13のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 前記亜鉛または亜鉛合金めっきが合金化溶融亜鉛めっきであり、前記亜鉛または亜鉛合金めっきが7から12%の鉄を含むことを特徴とする、請求項14に記載の冷間圧延焼鈍鋼板。
- 前記冷間圧延焼鈍鋼板が、真空蒸着を通じて得られた亜鉛または亜鉛合金めっきを含むことを特徴とする、請求項1から13のいずれか一項に記載の冷間圧延焼鈍鋼板。
- 下記の順次的工程:
含有率を重量%で表して:
0.10≦C≦0.13%
2.4≦Mn≦2.8%
0.30≦Si≦0.55%
0.30≦Cr≦0.56%
0.020≦Ti≦0.050%
0.0020≦B≦0.0040%
0.005≦Al≦0.050%
Mo≦0.010%
Nb≦0.040%
0.002≦N≦0.008%
S≦0.005%
P≦0.020%
を含む化学組成を有し、残部が鉄および製錬に由来する不可避的不純物からなる鋼半製品を準備する工程、次いで
前記鋼半製品を1250℃以上の温度Treheatまで加熱する工程、次いで
前記鋼半製品を熱間圧延し、最終圧延温度が冷却時のオーステナイト変態開始温度Ar3より高い温度となり、熱間圧延鋼板を得る工程、次いで
フェライトおよびパーライトの形成を回避するのに十分な速度にて前記熱間圧延鋼板を冷却する工程、次いで
前記熱間圧延鋼板を580℃未満の温度にてコイル状に巻き取る工程、次いで
前記熱間圧延鋼板を冷間圧延し、冷間圧延鋼板を得る工程、次いで
前記冷間圧延鋼板を、1から20℃/秒の範囲の加熱速度VRにて、600℃からAc1、すなわち加熱時のオーステナイト変態開始温度まで、再加熱する工程、次いで
前記冷間圧延鋼板を、Ac3’=Max{Ac3+1200/Dm;1000℃}(式中、Ac3およびAc3’は摂氏で表され、Dmは秒で表され、Ac3は当該温度Ac3における保持時間から独立して求められる加熱時のオーステナイト変態終了温度を表す。)として、Ac3’−10℃からAc3’+30℃の範囲の温度Tmまで再加熱し、前記冷間圧延鋼板を50から150秒の範囲の時間Dmにわたり温度Tmにて保持する工程、次いで
鋼板を、10から150℃/秒の範囲の速度にて460℃から490℃の範囲の温度Teまで冷却する工程、次いで
前記鋼板を、5から150秒の範囲の時間にわたり温度Teにて保持する工程、次いで
前記鋼板を、450℃から480℃の範囲の温度TZnにて、亜鉛または亜鉛合金槽に連続浸漬することにより、めっきする工程であって、前記温度TeおよびTZnは0≦(Te−TZn)≦10℃である、工程、次いで
場合によって、めっき鋼板を、10秒から40秒の範囲の時間tGにわたり、490℃から550℃の範囲の温度まで加熱する工程、
を含む、請求項1から15のいずれか一項に記載の冷間圧延焼鈍鋼板の製造方法。 - 下記の順次的工程:
含有率を重量%で表して:
0.10≦C≦0.13%
2.4≦Mn≦2.8%
0.30≦Si≦0.55%
0.30≦Cr≦0.56%
0.020≦Ti≦0.050%
0.0025≦B≦0.0040%
0.005≦Al≦0.050%
Mo≦0.010%
Nb≦0.040%
0.002≦N≦0.008%
S≦0.005%
P≦0.020%
を含む化学組成を有し、残部が鉄および製錬に由来する不可避的不純物からなる鋼半製品を準備する工程、次いで
前記鋼半製品を1250℃以上の温度Treheatまで加熱する工程、次いで
前記鋼半製品を熱間圧延し、最終圧延温度がAr3より高い温度となり、熱間圧延鋼板を得る工程、次いで
前記熱間圧延鋼板を、フェライトおよびパーライトの形成を回避するのに十分な速度にて冷却する工程、次いで
前記熱間圧延鋼板を580℃未満の温度にてコイル状に巻き取る工程、次いで
前記熱間圧延鋼板を冷間圧延し、冷間圧延鋼板を得る工程、次いで
前記冷間圧延鋼板を、1から20℃/秒の範囲の加熱速度VRにて、600℃からAc1、すなわち加熱時のオーステナイト変態開始温度まで、再加熱する工程、次いで
前記冷間圧延鋼板を、Ac3’=Max{Ac3+1200/Dm;1000℃}(式中、Ac3およびAc3’は摂氏で表され、Dmは秒で表され、Ac3は当該温度Ac3における保持時間から独立して求められる加熱時のオーステナイト変態終了温度を表す。)として、Ac3−10℃からAc3+30℃の範囲の温度Tmまで再加熱し、前記冷間圧延鋼板を50から150秒の範囲の時間Dmにわたり温度Tmにて保持する工程、次いで
鋼板を、10から100℃/秒の範囲の速度にて、460℃から490℃の範囲の温度Teまで冷却する工程、次いで
前記鋼板を、5から150秒の範囲の時間にわたり温度Teにて保持する工程、次いで
前記鋼板を周囲温度まで冷却する工程、
を含む、請求項1から13および16のいずれか一項に記載の冷間圧延焼鈍鋼板の製造方法。 - 亜鉛または亜鉛合金めっきが、周囲温度までの前記冷却工程の後に真空蒸着により行われる、請求項18に記載の冷間圧延焼鈍めっき鋼板の製造方法。
- 前記真空蒸着が物理蒸着法(PVD)により行われることを特徴とする、請求項19に記載の鋼板製造方法。
- 前記真空蒸着が噴射蒸着法(JVD)により行われることを特徴とする、請求項19に記載の鋼板製造方法。
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PCT/IB2014/066647 WO2015087224A1 (fr) | 2013-12-11 | 2014-12-05 | Acier à haute résistance et procédé de fabrication |
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Also Published As
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US20160312326A1 (en) | 2016-10-27 |
MA39075A1 (fr) | 2017-01-31 |
US10597745B2 (en) | 2020-03-24 |
UA118036C2 (uk) | 2018-11-12 |
CA2933542A1 (fr) | 2015-06-18 |
RU2016123172A (ru) | 2017-12-14 |
BR112016013130B1 (pt) | 2021-03-09 |
CN105874086A (zh) | 2016-08-17 |
EP3084014B1 (fr) | 2019-05-08 |
JP6599868B2 (ja) | 2019-10-30 |
KR102264641B1 (ko) | 2021-06-14 |
RU2016123172A3 (ja) | 2018-08-21 |
WO2015087224A1 (fr) | 2015-06-18 |
PL3084014T3 (pl) | 2019-10-31 |
ZA201603640B (en) | 2017-11-29 |
RU2669487C2 (ru) | 2018-10-11 |
EP3084014A1 (fr) | 2016-10-26 |
CN105874086B (zh) | 2018-07-03 |
WO2015088523A1 (en) | 2015-06-18 |
CA2933542C (fr) | 2023-02-14 |
HUE044562T2 (hu) | 2019-11-28 |
MX2016007664A (es) | 2016-09-13 |
BR112016013130A2 (pt) | 2017-08-08 |
MA39075B1 (fr) | 2017-11-30 |
KR20160096611A (ko) | 2016-08-16 |
ES2741304T3 (es) | 2020-02-10 |
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