公开(公告)号：EP2995395A4

公开(公告)日：2016-12-28

申请号：EP14795101

申请日：2014-05-09

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： MATSUNO TAKASHI ,  SEKITO YOSHIHITO ,  SUZUKI TAMAKI ,  KAWASAKI KAORU ,  SETO ATSUSHI

IPC分类号： B21D28/24 ,  B21D28/00 ,  C21D1/18 ,  C21D9/00 ,  C22C38/00 ,  C22C38/18

CPC分类号： B21D37/16 ,  B21D28/00 ,  B21D28/24 ,  C21D1/18 ,  C21D1/673 ,  C21D9/00 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2221/10 ,  C22C38/00 ,  C22C38/18

摘要： Provided is a surface layer grain refining hot-shearing method including: heating and keeping a steel sheet in a temperature range of from Ac3 to 1400°C to austenitize the steel sheet; subsequently shearing the steel sheet in a state in which the steel sheet is placed on a die; and quenching by rapidly cooling the sheared steel sheet, wherein a start temperature of the shearing is set to be a temperature (°C) obtained by adding a temperature of from 30°C to 140°C to a previously measured Ar3 of the steel sheet.

摘要翻译： 提供一种表面层晶粒细化热剪切方法，其包括：将钢板在Ac 3至1400℃的温度范围内加热并保持以对钢板进行奥氏体化; 随后在将钢板放置在模具上的状态下剪切钢板; 并通过快速冷却剪切钢板来淬火，其中剪切的开始温度设定为通过将30℃至140℃的温度加到钢板的先前测量的Ar 3上而获得的温度（℃） 。

公开(公告)号：EP2581465A4

公开(公告)日：2017-07-05

申请号：EP11795723

申请日：2011-06-14

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： KAWASAKI KAORU ,  SANO KOHICHI ,  SEKITO YOSHIHITO

IPC分类号： C22C38/00 ,  C21D9/46 ,  C22C38/38 ,  C22C38/58 ,  C23C2/28

CPC分类号： C21D8/005 ,  B21B1/026 ,  B21B45/00 ,  B21B45/0203 ,  B23P17/00 ,  B32B15/013 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C24/10 ,  C23C26/02 ,  Y10T29/49986 ,  Y10T428/12972

摘要： A hot-stamped steel according to the present invention includes, by mass%, C: 0.20% to 0.3 5%, Si: 0.1% to 0.5%, the total of at least one selected from Mn and Cr: 1% to 3%, Al: 0.005% to 0.06%, Ti: 0.002% to 0.1 %, Nb: 0.002% to 0.1 1 %, O: 0.003% to 0.007%, and a balance of iron and inevitable impurities, wherein P is limited to 0.015% or less, S is limited to 0.01% or less, N is limited to 0.004% or less, the dimensional ratio of the lengths of prior austenite grains in a rolling direction to the lengths of the prior austenite grains in the sheet thickness direction is 1.3 to 2.5, the average grain size of the prior austenite grains is 6 µm or less, the microstructure includes 98% or more of martensite, and the tensile strength is 1470 MPa or more.

摘要翻译： 本发明的热冲压成形用钢以质量％计含有C：0.20〜0.3％，Si：0.1〜0.5％，选自Mn和Cr中的至少1种：1〜3％ ，Al：0.005〜0.06％，Ti：0.002〜0.1％，Nb：0.002〜0.1 1％，O：0.003〜0.007％，余量由铁和不可避免的杂质构成，P限定为0.015％ 以下时，将S限制在0.01％以下，将N限制在0.004％以下，轧制方向的原奥氏体晶粒的长度相对于原板奥氏体晶粒的板厚方向的长度的尺寸比为1.3 至2.5，原奥氏体晶粒的平均晶粒尺寸为6μm或更小，组织包括98％或更多的马氏体，拉伸强度为1470MPa或更大。