Title:
ホットスタンプ部材用鋼板およびその製造方法
Document Type and Number:
Japanese Patent JP5605503
Kind Code:
B2
Abstract:
A steel sheet for obtaining a member which is excellent in fatigue characteristics equal to ordinary high strength steel sheet of the same strength even if applying the hot stamping process and a method of production of the same are provided. Steel sheet for a hot stamped member which includes composition which contains, by mass%, C: 0.15 to 0.35%, Si: 0.01 to 1.0%, Mn: 0.3 to 2.3%, Al: 0.01 to 0.5%, and a balance of Fe and unavoidable impurities, and limit the impurities to P: 0.03% or less, S: 0.02% or less, and N: 0.1% or less, wherein that a standard error of Vicker's hardness at a position of 20 µm from the steel sheet surface in the sheet thickness direction is 20 or less. This steel sheet is produced by a recrystallizationannealing step of a first stage of heating a cold rolled steel sheet, which is obtained by hot rolling steel containing the above composition and then cold rolling it, by an average heating rate of 8 to 25°C/sec from room temperature to 600 to 700°C, then a second stage of heating by an average heating rate of 1 to 7°C/sec to 720 to 820°C.
Inventors:
Hiroyuki Tanahashi
Jun Maki
Jun Maki
Application Number:
JP2013505953A
Publication Date:
October 15, 2014
Filing Date:
March 16, 2012
Export Citation:
Assignee:
The NSC 住金, Inc.
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/58; C22C18/04; C22C21/02
Domestic Patent References:
| JP2007314817A | 2007-12-06 | |||
| JP2006265583A | 2006-10-05 | |||
| JP2003147499A | 2003-05-21 | |||
| JP2007314817A | 2007-12-06 | |||
| JP2006265583A | 2006-10-05 |
Attorney, Agent or Firm:
Aoki 篤
Ishida 敬
Tetsuji Koga
Yoshihiro Kobayashi
Satoru Ideno
Ishida 敬
Tetsuji Koga
Yoshihiro Kobayashi
Satoru Ideno