发明名称 |
METHOD FOR MANUFACTURING HIGH STRENGTH STEEL SHEET |
摘要 |
A method for manufacturing a high strength steel sheet includes heating a steel sheet containing at least 0.10 mass % of carbon to either a temperature in an austenite single phase region or a temperature in an (austenite+ferrite) two-phase region; cooling the steel sheet to a cooling stop temperature as a target temperature set within a cooling temperature region ranging from Ms to (Ms-150° C.) to allow a portion of non-transformed austenite to proceed to martensitic transformation; retaining a coldest part in a sheet widthwise direction of the steel sheet at a temperature in a temperature range from the cooling stop temperature as the target temperature to (the cooling stop temperature+15° C.) for 15 seconds to 100 seconds; and heating the sheet to a temperature to temper said martensite, wherein "Ms" represents martensitic transformation start temperature and said cooling temperature region is exclusive of Ms and inclusive of (Ms-150° C.).
|
申请公布号 |
US2013133786(A1) |
申请公布日期 |
2013.05.30 |
申请号 |
US201113583295 |
申请日期 |
2011.02.28 |
申请人 |
MATSUDA HIROSHI;FUNAKAWA YOSHIMASA;TANAKA YASUSHI;JFE STEEL CORPORATION |
发明人 |
MATSUDA HIROSHI;FUNAKAWA YOSHIMASA;TANAKA YASUSHI |
分类号 |
C21D6/00;C23C2/02 |
主分类号 |
C21D6/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|