摘要:
A cold rolled steel sheet and a hot dip galvanized steel sheet, which have high strength and elongation, such as a tensile strength of 980 MPa or more and an elongation of 28% or more, and excellent delayed fracture resistance, and manufacturing methods thereof. The cold rolled steel sheet has a composition including 0.05 to 0.3 weight percent C, 0.3 to 1.6 weight percent. Si, 4.0 to 7.0 weight percent Mn, 0.5 to 2.0 weight percent Al, 0.01 to 0.1 weight percent Cr, 0.02 to 0.1 weight percent Ni and 0.005 to 0.03 weight percent Ti, 5 to 30 ppm B, 0.01 to 0.03 weight percent Sb, 0.008 weight percent or less S, balance Fe and impurities. The hot dip galvanized steel sheet has a hot dip galvanized layer or a hot dip galvannealed layer on the cold rolled steel sheet.
摘要:
A cold rolled steel sheet and a hot dip galvanized steel sheet, which have high strength and elongation, such as a tensile strength of 980 MPa or more and an elongation of 28% or more, and excellent delayed fracture resistance, and manufacturing methods thereof. The cold rolled steel sheet has a composition including 0.05 to 0.3 weight percent C, 0.3 to 1.6 weight percent Si, 4.0 to 7.0 weight percent Mn, 0.5 to 2.0 weight percent Al, 0.01 to 0.1 weight percent Cr, 0.02 to 0.1 weight percent Ni and 0.005 to 0.03 weight percent Ti, 5 to 30 ppm B, 0.01 to 0.03 weight percent Sb, 0.008 weight percent or less S, balance Fe and impurities. The hot dip galvanized steel sheet has a hot dip galvanized layer or a hot dip galvannealed layer on the cold rolled steel sheet.
摘要:
There are provided steel sheets which have a tensile strength of 780-980 MPa and an elongation of 28% or higher and are free of edge cracks. The high-strength steel sheet includes, by wt %, 0.1-0.25% C, 1.0-1.9% Si, 1.5-2.5% Mn, 0.5-1.6% Al, 0.005-0.03% Ti, 5-30 ppm B, 0.01-0.03% Sb and a balance of Fe and inevitable impurities, and satisfying 1.75%≦Si+Al≦3.25%.
摘要翻译:提供拉伸强度为780-980MPa,伸长率为28%以上且没有边缘裂纹的钢板。 高强度钢板以重量%计含有0.1-0.25%C,1.0-1.9%Si,1.5-2.5%Mn,0.5-1.6%Al,0.005-0.03%Ti,5-30ppm B,0.01- 0.03%Sb,余量为Fe和不可避免的杂质,满足1.75%≦̸ Si + Al + nlE; 3.25%。