公开(公告)号：EP3245310A2

公开(公告)日：2017-11-22

申请号：EP16706031.8

申请日：2016-01-14

申请人： Ak Steel Properties, Inc.

发明人： THOMAS, Grant, Aaron ,  BARROS LOSZ, Jose, Mauro ,  GARZA-MARTINEZ, Luis, Gonzalo ,  CASE, Eddie, Ray ,  PETERSEN, Eric ,  RASTOGI, Prabhat

IPC分类号： C22C38/04 ,  C21D8/04

CPC分类号： C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0478 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/26

摘要： A method for processing a dual phase steel sheet. The method includes heating the steel sheet to a first temperature (T1), cooling the steel sheet to a second temperature (T2), transitioning the steel sheet to a third temperature (T3), and cooling the steel sheet to room temperature. T1 is at least above the temperature at which the steel sheet transforms to austenite and ferrite. T2 is below the martensite start temperature (Ms). The cooling rate to T2 is sufficiently rapid to transform at least some austenite to martensite.