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METHOD FOR MANUFACTURING QUENCHED AND TEMPERED STEEL WITH SUPERIOR TENSILE STRENGTH OF AROUND 600MPa AND IMPROVED TOUGHNESS IN WELDED PART
METHOD FOR MANUFACTURING QUENCHED AND TEMPERED STEEL WITH SUPERIOR TENSILE STRENGTH OF AROUND 600MPa AND IMPROVED TOUGHNESS IN WELDED PART
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机译:具有600MPa以上拉伸强度并具有改进的韧性的淬火回火钢的制造方法。
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摘要
PURPOSE: Provided is a method for manufacturing quenched and tempered steel with superior tensile strength of around 600MPa and improved toughness in welded part. CONSTITUTION: The quenched and tempered steel is manufactured by (i) hot rolling of a steel slab comprising C 0.06-0.12wt.%, Si 0.1-0.5wt.%, Mn 1.0-1.6wt.%, Al 0.01-0.08wt.%, Ti 0.005-0.02wt.%, B 0.0003-0.003wt.%, N 0.002-0.008wt.% and two or more metals selected from Cu 0.5wt.% or less, Ni 1.0wt.% or less, Cr 0.5wt.% or less, Mo 0.5wt.% or less, Nb 0.1wt.% or less, V 0.1wt.% or less, Ti/N 1.5-2.5, a balance of Fe and other unavoidable impurities wherein carbon equivalent(Ceq) is 0.32-0.38wt.%; (ii) reheating the slab at a temperature range of Ac3 and 950deg.C followed by water-cooling; (iii) tempering at a temperature range of 500deg.C to Ac1.
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