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    • 6. 发明专利
    • HIGH TENSILE-HIGH TOUGHNESS STEEL
    • CA1234532A
    • 1988-03-29
    • CA486534
    • 1985-07-09
    • NIPPON STEEL CORP
    • IMAGUMBAI MASANACHIJIIWA RIKIOYAMADA NAOOMI
    • C22C38/00C21D1/18C21D8/02C22C38/12C22C38/14
    • A method for manufacturing high tensile-high toughness steel plate, which comprises the first step of preparing a steel slab or ingot consisting essentially, by weight, of 0.03 to 0.20% C 0.01 to 0.70% Si 0.50 to 1.80% Mn one or two selected from the group consisting of 0.005 to 0.05% Ti and 0.005 to 0.05% Zr, 0.005 to 0.10% Nb, not greater than 0.025% P, not greater than 0.015% S, not greater than 0.080% Al not greater than 0.0030% N, and the balance Fe and impurities incidentally mixed in the normal steel manufacturing process and having a value not smaller than 0.60 of DI* defined by formula, DI* = 1.11?C (1 + 0.7Si) (5.1Mn - 1.12) (unit of each components being weight %), the second step of rolling the slab or ingot with an accumulated rolling reduction of at least 30% in a temperature range between (Ar3 + 150.degree.C) and Ar3 in a cooling after casting, or in another cooling after reheating a cold steel slab in a temperature range between 1000.degree.C and 1300.degree.C, the third step of quenching the rolled steel from a temperature not less than (Ar3 - 30.degree.C) within a period of time in which neither recovering nor recrystallization substantially occur, and the fourth step of tempering at a temperature of not higher than Ac1. The steel slab or ingot may further contain 0.0003 to 0.0030 weight % B.