公开(公告)号：EP2767606A4

公开(公告)日：2015-09-30

申请号：EP12846397

申请日：2012-11-01

申请人： JFE STEEL CORP

发明人： FUNAKAWA YOSHIMASA ,  ARIGA TAMAKO ,  YAMAMOTO TETSUO ,  UCHOMAE HIROSHI ,  OWADA HIROSHI

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/14 ,  C22C38/60 ,  C23C2/06

CPC分类号： C22C38/001 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  Y02P10/212

摘要： A high strength hot rolled steel sheet having a tensile strength of 780 MPa or more is produced by specifying the composition to contain C: more than 0.035% and 0.07% or less, Si: 0.3% or less, Mn: more than 0.35% and 0.7% or less, P: 0.03% or less, S: 0.03% or less, Al: 0.1% or less, N: 0.01% or less, Ti: 0.135% or more and 0.235% or less, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, in such a way that C, S, N, and Ti satisfy ((Ti - (48/14)N - (48/32)S)/48)/(C/12)

公开(公告)号：EP2799578A4

公开(公告)日：2016-01-27

申请号：EP12863851

申请日：2012-12-14

申请人： JFE STEEL CORP

发明人： FUNAKAWA YOSHIMASA ,  YAMAMOTO TETSUO ,  UCHOMAE HIROSHI ,  NAKANO HIROSHI ,  KIZU TARO

IPC分类号： C22C38/00 ,  B21B3/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/60

CPC分类号： C21D9/46 ,  C21D8/0226 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0415 ,  C21D8/0426 ,  C21D8/0463 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/105 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/60 ,  Y10T428/12799 ,  Y10T428/12972

摘要： The invention provides high-strength hot rolled steel sheets with excellent stretch flangeability which have small variations in mechanical properties in individual coils. The chemical composition includes, by mass%, C: more than 0.010% and not more than 0.06%, Si: not more than 0.3%, Mn: not more than 0.8%, P: not more than 0.03%, S: not more than 0.02%, Al: not more than 0.1%, N: not more than 0.01% and Ti: 0.05 to 0.10%, the balance being Fe and inevitable impurities. Variations in strength from place to place in a coil are decreased by minimally reducing the Si and Mn contents to suppress the occurrence of problems such as segregation. Further, the microstructure of the steel sheets is configured such that a ferrite phase represents an area ratio of not less than 95%, the ferrite crystal grains have an average grain size of not less than 1 µm, and the ferrite crystal grains contain TiC with an average particle size of not more than 7 nm dispersed in the crystal grains. According to these configurations, high-strength hot rolled steel sheets may be obtained which ensure a yield strength of not less than 530 MPa.

公开(公告)号：EP2468911A4

公开(公告)日：2014-07-09

申请号：EP10810060

申请日：2010-08-19

申请人： JFE STEEL CORP

发明人： KOBAYASHI AKIO ,  FUNAKAWA YOSHIMASA ,  SETO KAZUHIRO ,  KAGEYAMA NOBUYUKI ,  YAMAMOTO TETSUO ,  HOSHI TORU ,  YOKOTA TAKESHI

IPC分类号： C22C38/60 ,  B21D22/20 ,  C21D9/46

CPC分类号： C22C38/02 ,  B21D22/022 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

公开(公告)号：EP1338665A4

公开(公告)日：2005-11-23

申请号：EP01980929

申请日：2001-10-29

申请人： JFE STEEL CORP

发明人： FUNAKAWA YOSHIMASA ,  SHIOZAKI TSUYOSHI ,  TOMITA KUNIKAZU ,  SAITO TAKANOBU ,  NAKATA HIROSHI ,  SATO KAORU ,  SUWA MINORU ,  YAMAMOTO TETSUO ,  MURAO YASUHIRO ,  MAEDA EEIJI

IPC分类号： B32B15/01 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C22C38/00 ,  C21D9/46 ,  C22C38/38

CPC分类号： C23C2/40 ,  B32B15/013 ,  C21D8/0226 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10T428/12799

摘要： The present invention relates to a high strength hot rolled steel sheet containing 0.15% or less C, 0.02 to 0.35% Ti, and 0.05 to 0.7% Mo by weight percentage and consisting essentially of a matrix of ferrite structure single phase and fine precipitates with a grain size of smaller than 10 nm dispersed in the matrix, for example, a high strength hot rolled steel sheet which consists essentially of 0.06% or less C, 0.5% or less Si, 0.5 to 2.0% Mn, 0.06% or less P, 0.005% or less S, 0.1% or less Al, 0.006% or less N, 0.02 to 0.10% Ti, 0.05 to 0.6% Mo by weight percentage, and the balance being Fe, wherein fine precipitates with a grain size of smaller than 10 nm are dispersed in a matrix of ferrite structure single phase at a number per unit volume of 5x10 /mum or higher. This steel sheet, which has tensile strength of not lower than 550 MPa, high elongation and excellent stretch flangeability, is suitable for intricately shaped automotive chassis parts such as a suspension arm.

摘要翻译： 本发明涉及一种含有0.15％以下的C，0.02〜0.35％Ti和0.05〜0.7％Mo的高强度热轧钢板，主要由铁素体结构单相和微细析出物组成， 分散在基体中的小于10nm的晶粒尺寸，例如基本上由0.06％以下的C，0.5％以下的Si，0.5〜2.0％的Mn，0.06％以下的P组成的高强度热轧钢板， 0.005％以下的S，0.1％以下的Al，0.006％以下的N，0.02〜0.10％的Ti，0.05〜0.6％的Mo，余量为Fe，其中微细析出的晶粒尺寸小于10 nm以5×10 4 / m 3以上的单位体积数分散在铁素体结构单相的基体中。 该拉伸强度不低于550MPa，延伸率高，拉伸凸缘性优异的钢板适用于悬挂臂等复杂形状的汽车底盘部件。