JP2017511839A - 溶接性及び耐食性に優れた熱間プレス成形用めっき鋼板、成形部材、及びその製造方法 - Google Patents
溶接性及び耐食性に優れた熱間プレス成形用めっき鋼板、成形部材、及びその製造方法 Download PDFInfo
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 55
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims description 3
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 3
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- 229910018131 Al-Mn Inorganic materials 0.000 description 8
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- 230000000052 comparative effect Effects 0.000 description 7
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- 238000005275 alloying Methods 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 4
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
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- 238000012423 maintenance Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
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- 239000002244 precipitate Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Abstract
Description
アルミニウムめっき鋼板は、耐熱性があるため加熱及び成形後の表面に酸化物が非常に薄く形成されて成形部品のスポット溶接特性に優れるという特性があるのに対し、成形後の素地鉄の上部合金層の電気化学的電位(potential)が素地鉄を保護できるほど十分に卑(base)ではないため素地鉄の犠牲防食が成されない。したがって、熱間プレス成形用鋼板として使用されるためのめっき層は、耐熱性があり、加熱及び成形後のめっき層が素地鉄を保護できるほど十分に卑な合金を合金層内に存在させる必要がある。
炭素は、鋼板の強度を増加させるのに最も効果的な元素であるが、多量添加される場合、溶接性及び低温靭性を低下させる元素である。炭素の含量が0.1重量%未満である場合は、オーステナイト単相域で熱間プレスを行っても目標とする強度を確保することが難しい。これに対し、0.4重量%を超過すると、溶接性及び低温靭性が劣化するため好ましくない。また、強度が高すぎるようになって焼鈍及びめっき工程で通板性を阻害する等、製造工程で不利な点が増える。したがって、上記炭素は0.1〜0.4重量%含まれることが好ましい。
シリコンは、脱酸剤として使用され、固溶強化による強度を向上させるために添加される元素である。本発明では、このような効果を示すために、0.05重量%以上含まれることが好ましい。但し、上記シリコンの含量が1.5%を超過すると、熱延板の酸洗が困難となって熱延鋼板の未酸洗及び未酸洗された酸化物によるスケール性の表面欠陥を誘発しかねない。
マンガンは、固溶強化元素として強度の上昇に大きく寄与するだけでなく、オーステナイトからフェライトへの変態を遅らせるのに効果的な元素である。本発明では、このような効果を示すために、0.5重量%以上含まれることが好ましい。しかし、マンガンの含量が3.0重量%を超過すると、溶接性、熱間圧延性等が劣化するという問題がある。
窒素は、オーステナイト結晶粒内において凝固過程でアルミニウムと作用して微細な窒化物を析出させて双晶の発生を促すため鋼板の成形時に強度及び延性を向上させるが、窒素の含量が増加するほど窒化物が析出しすぎて熱間加工性及び延伸率を低下させるため窒素の含有量を制御することが好ましい。窒素の含量が0.001重量%未満である場合は、製鋼過程で窒素を制御するための製造費用が大きく上昇するという問題があり、0.02重量%を超過すると、窒化物が析出しすぎて熱間加工性、延伸率、及び亀裂が発生するようになる。
ホウ素は、オーステナイトからフェライトへの変態を遅らせるのに効果的な元素である。本発明では、上述のような効果を示すために、0.0001重量%以上含ませることが好ましい。上記ホウ素の含量が0.01重量%を超過すると、熱間加工性を低下させるという問題がある。
チタン、ニオブ、及びバナジウムは、鋼板の強度の上昇、粒径の微細化、及び熱処理性を向上させるのに効果的な元素である。本発明では、上述のような効果を示すために、それぞれ0.001重量%以上含ませることが好ましい。但し、上記各元素の含量が0.1重量%を超過すると、製造費用の上昇、及び多すぎる
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と窒化物の生成によって確保しようとする強度及び降伏強度を得ることが難しい。
クロム及びモリブデンは、硬化能を大きくするだけでなく、鋼板の靭性を増加させるのに効果的な元素である。よって、高い衝突エネルギー特徴が求められる鋼板に添加すると、その効果がさらに大きくなる。但し、上記各含量が0.001%未満では、上記の効果を十分に得ることができず、1.0%超過すると、その効果が飽和されるだけでなく、製造費用が上昇する。
アンチモンは、熱間圧延時に粒界の選択酸化を防ぐことにより、スケールの生成が均一となり熱間圧延材の酸洗性を向上させる役割をする元素である。本発明では、上述のような効果を示すために、0.001重量%以上含むことが好ましい。上記アンチモンの含量が0.1重量%を超過すると、その効果が飽和されるだけでなく、製造費用が上昇し熱間加工時に脆性を起こす。
タングステンは、鋼板の熱処理硬化能を向上させる元素であるとともに、タングステン含有析出物が強度の確保に有利に作用する元素である。本発明では、上述のような効果を示すために、0.001重量%以上含むことが好ましい。上記タングステンの含量が0.3重量%を超過すると、その効果が飽和されるだけでなく、製造費用が上昇するという問題がある。
以下では、本発明の上記めっき鋼板を製造する方法について説明する。
以下では、本発明の上記めっき鋼板を用いて製造される熱間プレス成形部材について説明する。
以下では、本発明の熱間プレス成形部材の製造方法について説明する。
Claims (15)
- 素地鋼板と、
前記素地鋼板の少なくとも一面に形成され、マンガン(Mn)系めっき層とアルミニウム(Al)系めっき層が交互に形成され、最上層にはアルミニウム(Al)系めっき層が形成される複合めっき層と、を含み、
前記複合めっき層の全体の厚さは5〜30μmであり、前記マンガン(Mn)系めっき層が占める厚さの比率が5〜60%である、めっき鋼板。 - 前記複合めっき層の全体の厚さは5〜25μmであり、前記マンガン(Mn)系めっき層が占める厚さの比率が20〜50%である、請求項1に記載のめっき鋼板。
- 前記マンガン(Mn)系めっき層は、クロム(Cr)、亜鉛(Zn)、ベリリウム(Be)、マグネシウム(Mg)、カルシウム(Ca)、及びチタン(Ti)からなる群より選択された1種以上を20重量%以下(0重量%を除く)で含む、請求項1に記載のめっき鋼板。
- 前記アルミニウム(Al)系めっき層は、亜鉛(Zn)、シリコン(Si)、マグネシウム(Mg)、及びマンガン(Mn)からなる群より選択された1種以上を20重量%以下(0重量%を除く)で含む、請求項1に記載のめっき鋼板。
- 前記めっき鋼板は熱間プレス成形用めっき鋼板である、請求項1に記載のめっき鋼板。
- 素地鋼板と、
前記素地鋼板の少なくとも一面に形成される合金層と、を含み、
前記合金層は、鉄(Fe)−マンガン(Mn)系合金、鉄(Fe)−アルミニウム(Al)−マンガン(Mn)系合金、鉄(Fe)−アルミニウム(Al)系合金、及びアルミニウム(Al)−マンガン(Mn)系合金からなる群より選択された2種以上の合金を含む、熱間プレス成形部材。 - 前記合金層の最上層は、鉄(Fe)−アルミニウム(Al)−マンガン(Mn)系合金、鉄(Fe)−アルミニウム(Al)系合金、またはアルミニウム(Al)−マンガン(Mn)系合金である、請求項6に記載の熱間プレス成形部材。
- 前記合金層は、亜鉛(Zn)−マンガン(Mn)系合金、亜鉛(Zn)−鉄(Fe)系合金、鉄(Fe)−マンガン(Mn)−アルミニウム(Al)−マグネシウム(Mg)系合金、及び鉄(Fe)−マンガン(Mn)−アルミニウム(Al)−シリコン(Si)系合金からなる群より選択された1種以上の合金をさらに含む、請求項6に記載の熱間プレス成形部材。
- 前記合金層の最上層は、鉄(Fe)−アルミニウム(Al)−マンガン(Mn)系合金、鉄(Fe)−アルミニウム(Al)系合金、アルミニウム(Al)−マンガン(Mn)系合金、鉄(Fe)−マンガン(Mn)−アルミニウム(Al)−マグネシウム(Mg)系合金、または鉄(Fe)−マンガン(Mn)−アルミニウム(Al)−シリコン(Si)系合金である、請求項8に記載の熱間プレス成形部材。
- 前記合金層の最上層はアルミニウム(Al)を含む合金である、請求項6に記載の熱間プレス成形部材。
- 前記合金層の最外面に形成される表面酸化物の厚さが2μm以下である、請求項6に記載の熱間プレス成形部材。
- 素地鋼板を設ける段階と、
前記設けられた素地鋼板の少なくとも一面にマンガン(Mn)系めっき層とアルミニウム(Al)系めっき層を交互に形成し、且つ最上層にはアルミニウム(Al)系めっき層が形成されるようにして複合めっき層を形成する段階と、を含み、
前記複合めっき層は、全体の厚さが5〜30μmであり、前記マンガン(Mn)系めっき層が占める厚さの比率が5〜60%になるように形成される、めっき鋼板の製造方法。 - 前記マンガン(Mn)系めっき層は乾式めっき法によって形成される、請求項12に記載のめっき鋼板の製造方法。
- めっき鋼板をAc3変態点〜1000℃の温度範囲のうち一地点まで3〜200℃/sの平均昇温速度で加熱する段階と、
前記加熱されためっき鋼板を前記温度で熱間成形する段階と、
前記熱間成形されためっき鋼板を冷却する段階と、を含む、熱間プレス成形部材の製造方法。 - 前記加熱する段階後に、前記加熱されためっき鋼板を前記温度で240秒間以下の時間維持する段階をさらに含む、請求項14に記載の熱間プレス成形部材の製造方法。
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2013
- 2013-12-20 KR KR1020130160776A patent/KR101528067B1/ko active IP Right Grant
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2014
- 2014-12-12 EP EP14872120.2A patent/EP3085813A4/en not_active Withdrawn
- 2014-12-12 CN CN201480069513.6A patent/CN105917026B/zh active Active
- 2014-12-12 JP JP2016541040A patent/JP6328247B2/ja active Active
- 2014-12-12 US US15/102,833 patent/US10190221B2/en active Active
- 2014-12-12 WO PCT/KR2014/012273 patent/WO2015093793A1/ko active Application Filing
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2018
- 2018-12-28 US US16/235,716 patent/US10626504B2/en active Active
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JPS621860A (ja) * | 1985-06-26 | 1987-01-07 | Sumitomo Metal Ind Ltd | Al−Zn合金めつき鋼板 |
JPH05202488A (ja) * | 1992-01-16 | 1993-08-10 | Nippon Steel Corp | アルミニウム合金積層めっき鋼材およびその製造方法 |
JPH07292436A (ja) * | 1994-04-25 | 1995-11-07 | Nkk Corp | 耐食性に優れた深絞り用表面処理鋼板及びその製造方法 |
JP2000129467A (ja) * | 1998-10-29 | 2000-05-09 | Sumitomo Metal Ind Ltd | 2層めっき鋼材 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180131945A (ko) * | 2017-06-01 | 2018-12-11 | 주식회사 포스코 | 수소지연파괴 저항성이 우수한 열간 프레스 성형 부재용 강판 및 그 제조방법 |
KR102045622B1 (ko) * | 2017-06-01 | 2019-11-15 | 주식회사 포스코 | 수소지연파괴 저항성이 우수한 열간 프레스 성형 부재용 강판 및 그 제조방법 |
US11338549B2 (en) | 2017-06-01 | 2022-05-24 | Posco | Steel sheet for hot press formed member having excellent resistance to hydrogen delayed fracture and method for manufacturing thereof |
US11801664B2 (en) | 2017-06-01 | 2023-10-31 | Posco Co., Ltd. | Steel sheet for hot press formed member having excellent resistance to hydrogen delayed fracture and method for manufacturing thereof |
KR20210151035A (ko) * | 2019-12-18 | 2021-12-13 | 주식회사 포스코 | 알루미늄합금 도금강판, 열간성형 부재 및 이들의 제조방법 |
KR102560002B1 (ko) | 2019-12-18 | 2023-07-26 | 주식회사 포스코 | 알루미늄합금 도금강판, 열간성형 부재 및 이들의 제조방법 |
Also Published As
Publication number | Publication date |
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JP6328247B2 (ja) | 2018-05-23 |
CN105917026A (zh) | 2016-08-31 |
US10190221B2 (en) | 2019-01-29 |
US10626504B2 (en) | 2020-04-21 |
US20170029955A1 (en) | 2017-02-02 |
CN105917026B (zh) | 2019-12-10 |
KR101528067B1 (ko) | 2015-06-10 |
EP3085813A1 (en) | 2016-10-26 |
WO2015093793A1 (ko) | 2015-06-25 |
EP3085813A4 (en) | 2017-06-07 |
US20190136386A1 (en) | 2019-05-09 |
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