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Satisfactory high intensity cold rolling steel sheet and its production manner null of deep drawing Characteristic, chemical conversion coating Characteristic, resistance secondary process brittleness and spot
Satisfactory high intensity cold rolling steel sheet and its production manner null of deep drawing Characteristic, chemical conversion coating Characteristic, resistance secondary process brittleness and spot
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机译:令人满意的高强度冷轧钢板及其生产方式,不具有深冲特性,化学转化涂层特性,耐二次加工脆性和斑点
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摘要
PURPOSE:To produce a cold rolled high strength steel sheet excellent in deep drawability, chemical conversion treating property, secondary working brittleness resistance, and spot weldability by preparing a cold rolled sheet of a steel having a specific composition in which respective contents of Si, Ni, B, P, Al, etc., are specified. CONSTITUTION:A cold rolled sheet of a steel having a composition consisting of, by weight, 0.0005-0.0050% C, 0.30-1.20% Si, 0.05-0.30% Mn, 0.02-0.20% Ni, Ti in an amount of 0.010-0.30% expressed in terms of effective Ti computed by [effective Ti (%)]=Ti(%)-48/32S(%)-48/14N(%), 0.0003-O.0020% B, 0.040-0.150% P, 0.060-0.150% Al, =0.010% S, =0.0040% Ni, and the balance iron with inevitable impurities is prepared. By this method, the cold rolled high strength steel sheet having =about 40kgf/mm2 tensile strength can be obtained.
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