公开(公告)号：EP2837707A4

公开(公告)日：2016-02-17

申请号：EP13775246

申请日：2013-04-08

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： TANAKA YASUAKI ,  KAWANO KAORI ,  TASAKA MASAHITO ,  NAKAZAWA YOSHIAKI ,  NISHIO TAKUYA ,  WAKITA MASAYUKI ,  HAGA JUN ,  TOMIDA TOSHIRO

IPC分类号： C22C38/00 ,  C21D1/20 ,  C21D1/26 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C21D9/48 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC分类号： C22C38/38 ,  B32B15/013 ,  C21D1/20 ,  C21D1/26 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0436 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32

摘要： A steel sheet suitable as a starting material for an impact absorbing member of automobile, having high absorption of impact energy, and being resistant to cracking even when crashed, has a chemical composition containing, by mass%, C: 0.08-0.30%, Mn: 1.5-3.5%, Si + Al: 0.50-3.0%, P: 0.10% or less, S: at most 0.010%, and N: at most 0.010%, and also, in some cases, one or more types selected from Cr: at most 0.5%, Mo: at most 0.5% , B: at most 0.010%, Ti: less than 0.04%, Nb: less than 0.030%, V: less than 0.5%, Ca: at most 0.010%, Mg: at most 0.010%, REM: at most 0.050%, and Bi: at most 0.050%; having a microstructure containing, by area%, bainite: more than 50%, martensite: 3-30%, and retained austenite: 3-15%, the remainder comprising ferrite having an average grain diameter of less than 5 µm; and also having mechanical properties in which the product of uniform elongation and hole expansion ratio is at least 300% 2 , and 5% effective flow stress is at least 900 MPa.

摘要翻译： 适合作为汽车的冲击吸收部件的起始材料的钢板，其具有高的冲击能量吸收性，即使在碰撞时也耐龟裂，其化学成分含有质量％C：0.08〜0.30％，Mn ：1.5-3.5％，Si + Al：0.50-3.0％，P：0.10％以下，S：0.010％以下，N：0.0％以下，有时也可以选自 Cr：0.5％以下，Mo：0.5％以下，B：0.0％以下，Ti：0.04以下，Nb：0.030％以下，V：小于0.5％，Ca：0.010％以下，Mg： ：0.010％以下，REM：0.050％以下，Bi：0.050％以下。 具有以面积％计含有贝氏体的组织：大于50％，马氏体：3-30％，残留奥氏体：3〜15％，余量为平均粒径小于5μm的铁素体; 并且还具有机械性能，其中均匀伸长率和孔膨胀率的产品为至少300％2，5％有效流动应力为至少900MPa。

公开(公告)号：EP2730671A4

公开(公告)日：2015-12-09

申请号：EP12808022

申请日：2012-06-29

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： IMAI NORIO ,  WAKITA MASAYUKI ,  NISHIO TAKUYA ,  HAGA JUN ,  HATA KENGO ,  TANAKA YASUAKI ,  YOSHIDA MITSURU ,  TAKEBAYASHI HIROSHI ,  FUKUSHIMA SUGUHIRO ,  TOMIDA TOSHIRO

IPC分类号： C22C38/00 ,  C21D9/46 ,  C22C18/04 ,  C22C38/38 ,  C23C2/02

CPC分类号： C23C2/02 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C23C2/04 ,  Y10T428/12799

公开(公告)号：EP2730666A4

公开(公告)日：2015-10-07

申请号：EP12807151

申请日：2012-07-02

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： HAGA JUN ,  NISHIO TAKUYA ,  WAKITA MASAYUKI ,  TANAKA YASUAKI ,  IMAI NORIO ,  TOMIDA TOSHIRO ,  YOSHIDA MITSURU ,  HATA KENGO

IPC分类号： C21D9/46 ,  B21B3/00 ,  C21D8/02 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/38

CPC分类号： C21D8/0236 ,  C21D8/0247 ,  C21D8/0273 ,  C21D8/1261 ,  C21D2211/003 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

摘要： There is provided a method for producing a high-tensile cold-rolled steel sheet excellent in ductility, work hardening property, and stretch flanging property including subjecting a slab having a chemical composition containing C: more than 0.020% and less than 0.30%, Si: more than 0.10% and 3.00% or less, and Mn: more than 1.00% and 3.50% or less to: hot rolling such that the roll draft of the final one pass is higher than 15%, and rolling is finished in the temperature region of Ar 3 point or higher; hot-rolled sheet annealing such that the hot-rolled steel sheet is heated to 300°C or higher after being cooled to the temperature region of 780°C or lower and being coiled in the temperature region of higher than 400°C or lower than 400°C; cold rolling such that the obtained hot-rolled steel sheet or the hot-rolled and annealed steel sheet is cold-rolled; and annealing such that the cold-rolled steel sheet is subjected to soaking treatment in the temperature region of (Ac 3 point - 40°C) or higher, thereafter cooled to the temperature region of 500°C or lower and 300°C or higher, and is held in that temperature region for 30 seconds or longer.

摘要翻译： 提供了一种延展性，加工硬化性和拉伸凸缘性优异的高强度冷轧钢板的制造方法，其特征在于，使含有C：大于0.020％且小于0.30％的化学组成的板坯，Si ：超过0.10％和3.00％以下，Mn：大于1.00％和3.50％以下：热轧，最终一次的轧制速度高于15％，轧制结束于温度 Ar 3点以上区域; 热轧板退火，使得在冷却至780℃以下的温度区域之后将该热轧钢板加热至300℃以上，并且在高于400℃以下的温度区域内卷取 400℃; 冷轧，将得到的热轧钢板或热轧退火钢板冷轧; 进行退火，使得冷轧钢板在（Ac 3点-40℃）以上的温度区域进行均热处理，然后冷却至500℃以上至300℃以上的温度区域 ，并保持在该温度区域30秒以上。

公开(公告)号：EP2730672A4

公开(公告)日：2015-04-29

申请号：EP12808030

申请日：2012-06-27

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： HAGA JUN ,  NISHIO TAKUYA ,  WAKITA MASAYUKI ,  TANAKA YASUAKI ,  IMAI NORIO ,  TOMIDA TOSHIRO

IPC分类号： C22C38/00 ,  C21D1/673 ,  C21D9/46 ,  C21D9/48 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26 ,  C22C38/38

CPC分类号： C22C38/38 ,  C21D1/673 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26

摘要： A high-strength cold-rolled steel sheet excellent in ductility, work hardenability, and stretch flangeability, and having tensile strength of 780 MPa or more includes: a chemical composition containing, in mass percent, C: more than 0.020% to less than 0.30%, Si: more than 0.10% to 3.00% or less, Mn: more than 1.00% to 3.50% or less; and metallurgical structure whose main phase is a low-temperature transformation product, and whose secondary phase contains retained austenite. The retained austenite has a volume fraction relative to overall structure of more than 4.0% to less than 25.0% and an average grain size of less than 0.80 µm, and of the retained austenite, the number density of retained austenite grains whose grain size is 1.2 µm or more is 3.0 × 10 -2 grains/µm 2 or less.