发明公开
EP2762592A1 HIGH-STRENGTH HOT-DIPPED GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET, EACH HAVING TENSILE STRENGTH OF 980 MPA OR MORE, EXCELLENT PLATING ADHESION, EXCELLENT FORMABILITY AND EXCELLENT BORE EXPANDING PROPERTIES, AND METHOD FOR PRODUCING SAME 有权
高强度热浸镀锌钢板和高强度合金化热浸镀锌钢板与每个980兆帕拉伸强度或多个突出的镀覆粘合性,良好的加工性和未决BOHRAUFWEITUNGSEIGENSCHAFTEN及其制造方法

HIGH-STRENGTH HOT-DIPPED GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET, EACH HAVING TENSILE STRENGTH OF 980 MPA OR MORE, EXCELLENT PLATING ADHESION, EXCELLENT FORMABILITY AND EXCELLENT BORE EXPANDING PROPERTIES, AND METHOD FOR PRODUCING SAME
摘要:
Provided is a high-strength hot-dip galvanized steel sheet having excellent plating adhesion, formability, and hole expandability with an ultimate tensile strength of 980 MPa or more, the hot-dip galvanized steel sheet comprising a hot-dip galvanized layer formed on a surface of a base steel sheet. The base steel sheet contains, by mass%, C: 0.05% to 0.4%; Si: 0.01% to 3.0%; Mn: 0.1% to 3.0%; Al: 0.01 to 2.0%; in which Si + Al > 0.5%, P: limited to 0.04% or less; S: limited to 0.05% or less; N: limited to 0.01% or less; and a balance including Fe and inevitable impurities, a microstructure of the base steel sheet contains 40% or more by total volume fraction of martensite and bainite, 8% or more by volume fraction of residual austenite, and a balance of the microstructure being ferrite or ferrite and 10% or less by volume fraction of pearlite. The martensite contains 10% or more by total volume fraction of two or more kinds of three kinds of martensites (1), (2), and (3), and the hot-dip galvanized layer contains less than 7 mass% of Fe.
信息查询
0/0