公开(公告)号：US11279984B2

公开(公告)日：2022-03-22

申请号：US16470728

申请日：2017-12-19

申请人： ArcelorMittal

发明人： Jean-Marc Pipard ,  Marc Olivier Thenot ,  Pierre Targy

IPC分类号： C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/34 ,  C22C38/38 ,  C21D1/19 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

摘要： A cold rolled steel sheet, the steel containing, in weight percentage, 0.19%≤carbon≤0.24%, 1.9%≤manganese≤2.2%, 1.4%≤silicon≤1.6%, 0.01%≤aluminum≤0.06%, 0.2%≤chromium≤0.5%, phosphorus≤0.02%, sulfur≤0.003%, the balance including iron and unavoidable impurities, the steel sheet having a microstructure containing 5% to 15% of tempered martensite, 10% to 15% of residual austenite, the balance containing bainite, bainite content being at least 70%, is described. Also described is a manufacturing method and with use of such grade for making vehicle parts.

公开(公告)号：US12065724B2

公开(公告)日：2024-08-20

申请号：US16467371

申请日：2017-12-19

申请人： ArcelorMittal

发明人： Jean-Marc Pipard ,  Marc Olivier Thenot

IPC分类号： C22C38/04 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC分类号： C22C38/04 ,  C21D8/0226 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/06 ,  C23C2/28 ,  C23C2/29 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

摘要： A tempered and coated steel sheet having a composition containing the following elements, expressed in percentage by weight: 0.17%≤carbon≤0.25%, 1.8%≤manganese≤2.3%, 0.5%≤silicon≤2.0%, 0.03%≤aluminum≤1.2%, sulphur≤0.03%, phosphorus≤0.03%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet containing in area fraction, 3 to 20% residual austenite, at least 15% of ferrite, 40 to 85% tempered bainite and a minimum of 5% of tempered martensite, wherein cumulated amounts of tempered martensite and residual austenite is between 10 and 30%. The composition may also contain one or more of the following elements chromium≤0.4%, molybdenum≤0.3%, niobium≤0.04%, titanium≤0.1%. Methods of manufacturing and use of the tempered and coated steel sheets are also described.

公开(公告)号：US11655516B2

公开(公告)日：2023-05-23

申请号：US16467643

申请日：2017-12-15

申请人： ArcelorMittal

发明人： Jean-Marc Pipard ,  Marc Olivier Thenot

IPC分类号： C21D9/46 ,  C21D1/20 ,  C21D1/22 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  B32B15/01

CPC分类号： C21D9/46 ,  B32B15/012 ,  C21D1/20 ,  C21D1/22 ,  C21D8/0263 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  B32B2605/08 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C2204/00

摘要： A tempered and coated steel sheet having a composition containing the following elements, expressed in percentage by weight:



0.17%≤carbon≤0.25%,
1.8%≤manganese≤2.3%,
0.5%≤silicon≤2.0%,
0.03%≤aluminum≤1.2%,
sulphur≤0.03%,
phosphorus≤0.03%,

the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet containing in area fraction, 4 to 20% residual austenite, 0 to 15% of ferrite, 40 to 85% tempered bainite and a minimum of 5% of tempered martensite, wherein the cumulated amounts of tempered martensite and residual austenite is between 10 and 30%. The composition may also contain one or more of the following elements: chromium≤0.4%, molybdenum≤0.3%, niobium≤0.04%, titanium≤0.1%. Manufacturing methods and use of tempered and coated steel sheet for making vehicle parts are also described.