公开(公告)号：EP1790422B1

公开(公告)日：2012-02-22

申请号：EP05785864.9

申请日：2005-09-15

申请人： Nippon Steel Corporation

发明人： KUSUMI, Kazuhisa ,  SATO, Hironori ,  ABE, Masayuki ,  FUJITA, Nobuhiro ,  SUZUKI, Noriyuki ,  HAYASHI, Kunio ,  NAKAJIMA, Shinya ,  MAKI, Jun ,  OOGAMI, Masahiro ,  KANDA, Toshiyuki ,  TAKAHASHI, Manabu ,  TAKAHASHI, Yuzo

IPC分类号： B21D28/00 ,  B21D37/16 ,  B21D28/14 ,  C21D9/46 ,  C21D1/74 ,  C22C38/00 ,  C22C38/04 ,  C22C38/38 ,  B21D53/88

CPC分类号： C22C38/04 ,  C21D1/673 ,  C21D1/74 ,  C21D8/0205 ,  C21D9/0068 ,  C21D9/48 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/18 ,  C22C38/28

摘要： A high-strength part that excels in hydrogen embrittlement resistance and strength after high-temperature forming; and a process for producing the same. The atmosphere in a heating furnace before forming is regulated to one of ≤ 10% hydrogen volume fraction and ≤ 30°C dew point. As a result, the amount of hydrogen penetrating in a steel sheet during heating is reduced. After forming, there are sequentially carried out quench hardening in die assembly and post-working. As the method of post-working, there can be mentioned shearing followed by re-shearing or compression forming of sheared edge portion; punching with a cutting blade having a gradient portion at which the width of blade base is continuously reduced; punching with a punching tool having a curved blade with a protrudent configuration at the tip of cutting blade part, the curved blade having a shoulder portion of given curvature radius and/or given angle; fusion cutting; etc. Consequently, the tensile residual stress after punching is reduced and the performance of hydrogen embrittlement resistance is improved.

公开(公告)号：EP2088218A1

公开(公告)日：2009-08-12

申请号：EP07831772.4

申请日：2007-11-07

申请人： Nippon Steel Corporation

发明人： SUGIURA, Natsuko ,  MARUYAMA, Naoki ,  TAKAHASHI, Manabu ,  NAKAMURA, Yohji ,  HANYA, Koji

IPC分类号： C22C38/00 ,  B21B3/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/58 ,  C23C2/06 ,  C23C2/38

CPC分类号： C23C2/40 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0426 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  Y10T428/12799

摘要： Steel sheet having a composition of ingredients containing substantially, by mass%, C: 0.005 to 0.200%, Si: 2.50% or less, Mn: 0.10 to 3.00%, N: 0.0100% or less, Nb: 0.005 to 0.100%, and Ti: 0.002 to 0.150% and satisfying the relationship of Ti-48/14×N≥0.0005, having a sum of the X-ray random intensity ratios of the {100} orientation and the {110} orientation of a 1/6 sheet thickness part of 5 or less, having a sum of the maximum value of the X-ray random intensity ratios of the {110} to {110} orientation group and the X-ray random intensity ratios of the {211} orientation of 5 or more, and having a high rolling direction Young's modulus measured by the static tension method and a method of production of the same are provided.

公开(公告)号：EP1932932A1

公开(公告)日：2008-06-18

申请号：EP05793808.6

申请日：2005-10-05

申请人： Nippon Steel Corporation

发明人： YOSHINAGA, Naoki ,  MARUYAMA, Naoki ,  TAKAHASHI, Manabu ,  SUGIURA, Natsuko

IPC分类号： C22C38/00 ,  C22C38/38 ,  C22C38/58 ,  C21D9/46 ,  B21B3/00 ,  C23C2/06

CPC分类号： C23C2/06 ,  B21B3/02 ,  C21D8/02 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/32 ,  C23C2/28

摘要： The invention provides a cold-rolled steel sheet excellent in paint bake hardenability and ordinary-temperature non-aging property comprising, in mass%, C: 0.0005 - 0.0040%, Si: 0.8% or less, Mn: 2.2% or less, S: 0.0005 - 0.009%, Cr: 0.4 - 1.3%, O: 0.003 - 0.020%, P: 0.045 - 0.12%, B: 0.0002 -0.0010%, Al: 0.008% or less, N: 0.001 - 0.007%, and a balance of Fe and unavoidable impurities. Ultra-low-carbon steel retaining solute N and containing added Cr, P, B and O is used to produce hot-rolled and cold-rolled steel sheet and hot-dip galvanized cold-rolled steel sheet that exhibit both high paint bake hardenability and ordinary-temperature non-aging property.

摘要翻译： 本发明提供一种冷轧钢板具有优良的漆烘烤硬化性和常温非时效性，其包括，以质量％计，C：0.0005 - 0.0040％以下，Si：0.8％以下，Mn：2.2％以下，S ：0.0005 - 0.009％以下，Cr：0.4 - 1.3％，O：0003-0020％，P：0.045 - 0.12％，B：0.0002 -0.0010％以下，Al：0.008％以下，N：0001-0007％，和一个 Fe和不可避免的杂质的平衡。 超低碳钢保持固溶N和含添加的Cr，P，B和O被用于生产热轧和冷轧钢板和热浸镀锌冷轧钢板并同时表现出高的涂料的烘烤硬化性和 常温非时效性。