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.