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HIGH TENSILE STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS IN WELD HEAT-AFFECTED ZONES, AND METHOD FOR PRODUCING SAME
HIGH TENSILE STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS IN WELD HEAT-AFFECTED ZONES, AND METHOD FOR PRODUCING SAME
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机译:在焊接热影响区具有优异的低温韧性的高强度钢板及其制造方法
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摘要
The present invention provides a high tensile strength steel plate having excellent low-temperature toughness (CTOD property) in the multi-layer weld, and a method for producing the same. Specifically, the high tensile strength steel plate has a chemical composition containing, in percent by mass, 0.03% to 0.12% of C, 0.01% to 0.30% of Si, 0.5% to 1.95% of Mn, 0.008% or less of P, 0.005% or less of S, 0.015% to 0.06% of Al, 0.011% to 0.05% of Nb, 0.005% to 0.02% of Ti, 0.001% to 0.006% of N, 0.0005% to 0.003% of Ca, optionally, one or two or more of Cr, Mo, V, Cu, and Ni, in which Ceq is 0.44 or less, Ti/N is 1.5 to 3.5, and parameter formulas composed of specific elements for controlling the sulfide morphology and the degree of center segregation in the steel are satisfied, and the balance being Fe and incidental impurities, in which the hardness of the center segregation area of the steel sheet is further specified.
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