公开(公告)号：US20220136078A1

公开(公告)日：2022-05-05

申请号：US17575300

申请日：2022-01-13

Applicant: ArcelorMittal

Inventor： Javier Gil Otin ,  Antoine Moulin

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/22 ,  C22C38/32 ,  C22C38/00 ,  C22C38/38 ,  C21D8/02 ,  C22C38/12 ,  C23G1/08 ,  C21D9/52 ,  C22C38/02 ,  C22C38/14 ,  C22C38/28 ,  B22D11/00 ,  C22C38/04 ,  C23G1/00

Abstract: The present invention provides a cold-rolled and annealed steel sheet with a strength greater than 1200 MPa, the composition of which includes, the contents being expressed by weight: 0.10%≤C≤0.255, 1%≤Mn≤3%, A≥0.010%, Si≤2.990%, S≤0.015%, P≤0.1% s, N≤0.008%, it being understood that 1%≤Si+Al≤3%, it being understood that Cr+3Mo≥0.3%, Ti in an amount such that Ti/N≥4 and Ti≤0.040%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The microstructure of the steel includes 15 to 90% bainite, the remainder includes martensite and residual austenite.

公开(公告)号：US20200032366A1

公开(公告)日：2020-01-30

申请号：US16592341

申请日：2019-10-03

Applicant: ArcelorMittal

Inventor： Javier Gil Otin ,  Antoine Moulin

IPC: C21D9/46 ,  C21D8/02 ,  C21D9/52 ,  C23G1/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  B22D11/00 ,  C22C38/00 ,  C22C38/14 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23G1/00

Abstract: A process for manufacturing a cold-rolled steel sheet with a strength of at least 1200 MPa and an elongation at break greater than 10%. A steel is provided having a microstructure comprising 65 to 90% bainite. A semifinished product is cast from the steel and heated to a temperature greater than 1150° C. The semifinished product is hot rolled to obtain a hot-rolled sheet; the coiled and pickled. Cold-rolling occurs with a reduction ratio of between 30 and 80% so as to obtain a cold-rolled sheet; and then reheating occurs at a rate Vc between 5 and 15° C./s up to a temperature T1 between Ac3 and Ac3+20° C. and held at said temperature T1 for a time t1 between 50 and 150 s. The sheet is cooled at a rate VR1 greater than 40° C./s but below 100° C./s down to a temperature T2 between (Ms−30° C. and Ms+30° C.). The sheet is maintained at temperature T2 for a time t2 between 150 and 350 s, and then cooled at a rate VR2 of less than 30° C./s down to an ambient temperature.

公开(公告)号：US11414722B2

公开(公告)日：2022-08-16

申请号：US16592341

申请日：2019-10-03

Applicant: ArcelorMittal

Inventor： Javier Gil Otin ,  Antoine Moulin

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D9/52 ,  C23G1/08 ,  B22D11/00 ,  C22C38/00 ,  C22C38/14 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23G1/00

Abstract: A process for manufacturing a cold-rolled steel sheet with a strength of at least 1200 MPa and an elongation at break greater than 10%. A steel is provided having a microstructure comprising 65 to 90% bainite. A semifinished product is cast from the steel and heated to a temperature greater than 1150° C. The semifinished product is hot rolled to obtain a hot-rolled sheet; the coiled and pickled. Cold-rolling occurs with a reduction ratio of between 30 and 80% so as to obtain a cold-rolled sheet; and then reheating occurs at a rate Vc between 5 and 15° C./s up to a temperature T1 between Ac3 and Ac3+20° C. and held at said temperature T1 for a time t1 between 50 and 150 s. The sheet is cooled at a rate VR1 greater than 40° C./s but below 100° C./s down to a temperature T2 between (Ms−30° C. and Ms+30° C.). The sheet is maintained at temperature T2 for a time t2 between 150 and 350 s, and then cooled at a rate VR2 of less than 30° C./s down to an ambient temperature.

公开(公告)号：US20160355900A1

公开(公告)日：2016-12-08

申请号：US15243610

申请日：2016-08-22

Applicant: ArcelorMittal

Inventor： Javier Gil Otin ,  Antoine Moulin

IPC: C21D9/46 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/14 ,  B22D11/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C23G1/00 ,  C22C38/38 ,  C22C38/12

CPC classification number: C21D9/46 ,  B22D11/001 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/52 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23G1/00 ,  C23G1/08

Abstract: The present invention provides a cold-rolled and annealed steel sheet with a strength greater than 1200 MPa, the composition of which includes, the contents being expressed by weight: 0.10%≦C≦0.25%, 1%≦Mn≦3%, A≧0.010%, Si≦2.990%, S≦0.015%, P≦0.1%, N≦0.008%, it being understood that 1%≦Si+Al≦3%, it being understood that Cr+3Mo≧0.3%, Ti in an amount such that Ti/N≧4 and Ti≦0.040%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The microstructure of the steel includes 15 to 90% bainite, the remainder includes martensite and residual austenite.

Abstract translation: 本发明提供一种强度大于1200MPa的冷轧退火钢板，其组成包括：重量含量：0.10％≤C≤0.25％，1％≤Mn≤3％，A ≧0.010％，Si≤2.990％，S≤0.015％，P≤0.1％，N≤0.008％，1％≤Si+Al≤3％，可知Cr +3Mo≥0.3％，Ti 其量使得Ti /N≥4和Ti≤0.040％。 组合物的余量包括由冶炼产生的铁和不可避免的杂质。 钢的显微组织包括15％至90％的贝氏体，其余包括马氏体和残余奥氏体。