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公开(公告)号:US09873931B2
公开(公告)日:2018-01-23
申请号:US14553033
申请日:2014-11-25
Applicant: ARCELORMITTAL
Inventor: Mohamed Bouzekri , Michel Faral , Colin Scott
IPC: C22C38/04 , C22C38/58 , C21D8/02 , C22C38/02 , H01M4/86 , H01M4/88 , H01M4/90 , H01M4/92 , H01M8/0232 , B21B3/02 , C22C38/00 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/34 , C22C38/38 , C22C38/42 , C22C38/44 , H01M8/1004
CPC classification number: C22C38/58 , B21B3/02 , C21D8/0205 , C21D8/0226 , C21D8/0273 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/34 , C22C38/38 , C22C38/42 , C22C38/44 , H01M4/8605 , H01M4/8807 , H01M4/8817 , H01M4/8853 , H01M4/8892 , H01M4/9075 , H01M4/925 , H01M8/0232 , H01M8/1004 , Y02E60/50 , Y02P70/56
Abstract: A hot-rolled austenitic iron/carbon/manganese steel sheet is provided. The strength of which is greater than 900 MPa, the product (strength (in MPa)×elongation at fracture (in %)) of which is greater than 45000 and the chemical composition of which includes, the contents being expressed by weight 0.5%≦C≦0.7%, 17%≦Mn≦24%, Si≦3%, Al≦0.050%, S≦0.030%, P≦0.080% and N≦0.1%. A remainder of the composition includes iron and inevitable impurities resulting from the smelting. A recrystallized fraction of the structure of the steel is greater than 75%, a surface fraction of precipitated carbides of the steel is less than 1.5% and a mean grain size of the steel is less than 18 microns. A reinforcing element is also provided.