JP2016537502A - 熱間成形鋼材 - Google Patents
熱間成形鋼材 Download PDFInfo
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Abstract
Description
また、本発明は22MnB5のような従来の熱間成形鋼材に代わる熱間成形鋼材を提供することも目的とする。
さらに、本発明は、自動車産業で現在用いられている設備を変更することなく利用できる熱間成形鋼材を提供することを目的とする。
さらにまた、本発明は熱間成形設備の、より効率的な運用が可能になる熱間成形鋼材を提供することを目的とする。
C:0.10−0.25、
Mn:1.4−2.6、
Si:≦0.4
Cr:≦1.0、
Al:≦1.5、
P:≦0.02、
S:≦0.005、
O:≦0.008
N:≦0.03、
B:≦0.0004、
所望により
Ti:≦0.3
Mo:≦0.5
Nb:≦0.3
V:≦0.5、
Ca:≦0.05、
残部は鉄および不可避的不純物
である熱間成形鋼材にある。
‐例えば、ストリップ材、シート材あるいはチューブ材を裁断するなどして、ブランク材を準備する工程、
‐ブランク材もしくはチューブ材を鋼材のAc1温度を超える温度、好ましくは鋼材のAc3温度を超えるが1000℃以下である温度まで加熱する工程、
‐加熱したブランク材もしくはチューブ材を熱間成形プレス機に搬送する工程、
‐プレス機によってブランク材もしくはチューブ材を成形する工程、および
‐成形品を炉温とMs温度の間で、臨界焼入速度(CQR)を超える平均冷却速度によって焼入れする工程
からなる製造法にもある。
Claims (15)
- 成分組成が、重量パーセントで
C:0.10−0.25、
Mn:1.4−2.6、
Si:≦0.4、
Cr:≦1.0、
Al:≦1.5、
P:≦0.02、
S:≦0.005、
N:≦0.03、
B:≦0.0004、
O:≦0.008
そして、所望により
Ti:≦0.3
Mo:≦0.5
Nb:≦0.3
V:≦0.5、
Ca:≦0.05、
残部は鉄および不可避的不純物
である熱間成形鋼材。 - 請求項1に記載の鋼材であって、
C:0.12−0.23、および/または
Mn:1.6−2.5、および/または
Si:≦0.3、および/または
Cr:≦0.8、および/または
Al:≦0.5、好ましくは、Al≦0.1
O:≦0.005、および/または
N:≦0.01、および/または
B:≦0.0003、好ましくは、B≦0.0002、および/または
Ti:≦0.1、および/または
Mo:≦0.2、および/または
Nb:≦0.1、および/または
V:≦0.2、および/または
Ca:≦0.01
である請求項1に記載の鋼材。 - 請求項1または2に記載の鋼材であって、
C:0.15−0.21、および/または
Mn:1.8−2.4、および/または
Si:≦0.2、および/または
Cr:≦0.7、好ましくは、Cr0.2−0.7、および/または
Al:≦0.05、および/または
N:≦0.006、および/または
Ti:≦0.02、および/または
Mo:≦0.08、および/または
Nb:≦0.02、および/または
V:≦0.02、および/または
B:≦0.0001、好ましくは、B≦0.00009
である請求項1または2に記載の鋼材。 - Mn+Cr≧2.5重量パーセント、好ましくは、Mn+Cr≧2.6重量パーセントである請求項1、2または3に記載の鋼材。
- 上記いずれかの請求項に記載の鋼材から製造されたストリップ材、ブランク材もしくはチューブ材。
- アルミニウムまたはアルミニウムベース合金、あるいは亜鉛または亜鉛ベース合金によってプレコートされた請求項5に記載のストリップ材、ブランク材もしくはチューブ材。
- プレコート層が、5〜13重量%のケイ素および/または5重量%未満の鉄と残部はアルミニウムからなっており、厚さが好ましくは片面当たり10〜40μm、より好ましくは片面当たり20〜35μmである請求項6に記載のストリップ材、ブランク材もしくはチューブ材。
- プレコート層が、8〜12重量%のケイ素および/または2〜5重量%の鉄と残部はアルミニウムからなっている請求項7に記載のストリップ材、ブランク材もしくはチューブ材。
- プレコート層が、0.18重量%未満のアルミニウム、15重量%未満の鉄、残部が亜鉛と痕跡量の他の元素からなる亜鉛層を熱処理することで得られる鉄‐亜鉛拡散層であり、厚さが好ましくは片面当たり5〜15μm、より好ましくは片面当たり6〜13μmである請求項6に記載のストリップ材、ブランク材もしくはチューブ材。
- プレコート層が、0.5〜4重量%のアルミニウム、0.5〜3.2重量%のマグネシウム、残部が亜鉛と痕跡量の他の元素からなっていて、厚さが好ましくは片面当たり5〜15μm、より好ましくは片面当たり6〜13μmである請求項6に記載のストリップ材、ブランク材もしくはチューブ材。
- 請求項6〜10のいずれかに記載のストリップ材、ブランク材もしくはチューブ材を用いた熱間成形品の製造法であって、
‐例えば、ストリップ材、シート材あるいはチューブ材を裁断するなどして、ブランク材を準備する工程、
‐ブランク材もしくはチューブ材を鋼材のAc1温度を超える温度、好ましくは鋼材のAc3温度を超えるが1000℃以下である温度まで加熱する工程、
‐加熱したブランク材もしくはチューブ材を熱間成形プレス機に搬送する工程、
‐プレス機によってブランク材もしくはチューブ材を成形する工程、および
‐成形品を炉温とMs温度の間で、臨界焼入速度(CQR)を超える平均冷却速度によって焼入れする工程
からなる製造法。 - 前記のブランク材もしくはチューブ材を少なくとも部分的に、Ac1温度より高い温度、好ましくはAc3温度より高い温度で、かつ950℃より低い、好ましくは900℃より低い温度まで加熱する請求項11に記載の製造法。
- 加熱したブランク材もしくはチューブ材を熱間成形プレス機に装填する前に、強制的に冷却する請求項11または12に記載の製造法。
- 請求項11〜13のいずれかに記載の製造法によって製造された成形品。
- 請求項14に記載の成形品の自動車への使用。
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EP20130004573 EP2851440A1 (en) | 2013-09-19 | 2013-09-19 | Steel for hot forming |
EP13004573.5 | 2013-09-19 | ||
EP14162308 | 2014-03-28 | ||
EP14162308.2 | 2014-03-28 | ||
PCT/EP2014/002552 WO2015039763A2 (en) | 2013-09-19 | 2014-09-19 | Steel for hot forming |
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US (1) | US20160289809A1 (ja) |
EP (1) | EP2988887A2 (ja) |
JP (1) | JP2016537502A (ja) |
KR (1) | KR20160057457A (ja) |
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KR20160057457A (ko) | 2016-05-23 |
US20160289809A1 (en) | 2016-10-06 |
CA2924812A1 (en) | 2015-03-26 |
CN105658834A (zh) | 2016-06-08 |
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