首页> 外国专利> HIGH-STRENGTH COLD-ROLLED STEEL SHEET HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET HAVING EXCELLENT DUCTILITY STRETCH-FLANGEABILITY AND WELDABILITY

HIGH-STRENGTH COLD-ROLLED STEEL SHEET HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET HAVING EXCELLENT DUCTILITY STRETCH-FLANGEABILITY AND WELDABILITY

机译:高强度冷轧钢板,高强度热浸镀锌钢板和高强度热镀锌钢板,具有出色的延展性,延展性和可焊性

摘要

A high strength cold rolled steel sheet excellent in weldability in addition to ductility and stretch flangeability in a region having a tensile strength of 980 MPa or more and a 0.2% proof stress of less than 700 MPa (preferably 500 MPa or more) is provided. The high-strength cold-rolled steel sheet of the present invention is characterized in that the chemical composition is properly adjusted and the area ratio of the following metal structure at a 1/4 position of the sheet thickness of the steel sheet is 10 to 30% Bainite: more than 70% by area, total of tempering martensite and bainite: 90% or more, ferrite: 0% or more and 5% or less, and retained austenite: 0% or more and 4% or less , It has excellent ductility, elongation flangeability and weldability, and satisfies tensile strength of 980 MPa or more and 0.2% proof strength of less than 700 MPa.
机译:提供在抗拉强度为980MPa以上且0.2%屈服强度小于700MPa(优选为500MPa以上)的区域中,除了延展性和拉伸凸缘性以外的,焊接性优异的高强度冷轧钢板。本发明的高强度冷轧钢板的特征在于,适当地调整了化学组成,在钢板的板厚的1/4位置处的以下的金属组织的面积比为10〜30。贝氏体%:面积占70%以上,回火马氏体和贝氏体的合计:90%以上,铁素体:0%以上且5%以下,残留奥氏体:0%以上且4%以下,具有优异的延展性,延伸率和可焊性,并满足980 MPa以上的抗拉强度和小于700 MPa的0.2%屈服强度。

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