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590N/MM2 CLASS STEEL PLATE FOR WELDED STRUCTURE, EXCELLENT IN TOUGHNESS IN HAZ AT LARGE HEAT INPUT WELDING AND HAVING =80 YIELD RATIO, AND ITS PRODUCTION
590N/MM2 CLASS STEEL PLATE FOR WELDED STRUCTURE, EXCELLENT IN TOUGHNESS IN HAZ AT LARGE HEAT INPUT WELDING AND HAVING =80 YIELD RATIO, AND ITS PRODUCTION
PROBLEM TO BE SOLVED: To secure toughness in an HAZ(heat-affected zone) by subjecting a steel slab of specific composition to hot rolling and to accelerated cooling under respectively specified conditions. ;SOLUTION: A steel slab, having a composition which consists of, by mass, 0.10-0.16% C, ≤0.40% Si, 1.00-1.80% Mn, ≤0.025% P, ≤0.012% S, 0.005-0.020% Ti, 0.010-0.080% Al, 0.0020-0.0080% N, and the balance Fe with inevitable impurities and in which Ceq, represented by Ceq=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14, is regulated to 0.37-0.40%, is hot-rolled at ≥850°C rolling temp. Subsequently, cooling is performed from a temp. not lower than the Ar1 point down to ≤500°C at (6 to 14)°C/sec cooling rate, by which a steel plate, in which toughness in the whole region of HAZ after large heat input welding of ≥30kj/mm amount of weld heat input is regulated to ≥47J by 0°C Charpy absorption energy, is prepared. By this method, the 590N/mm2 class steel plate for welded structure, excellent in toughness in HAZ at the time of large heat input welding and having ≤80% yield ratio, can be obtained.;COPYRIGHT: (C)1998,JPO
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机译：要解决的问题：通过在特定的指定条件下对特定成分的钢坯进行热轧和加速冷却，以确保在热影响区（热影响区）中具有韧性。 ;解决方案：一种钢板，其成分按质量计由0.10-0.16％C，≤0.40％Si，1.00-1.80％Mn，≤0.025％P，≤0.012％S，0.005-0.020％Ti， 0.010-0.080％Al，0.0020-0.0080％N和余量的Fe不可避免地存在杂质，其中Ceq以Ceq = C + Si / 24 + Mn / 6 + Ni / 40 + Cr / 5 + Mo / 4 +表示V / 14调节至0.37-0.40％，在≥850°C的轧制温度下热轧。随后，从温度开始进行冷却。不低于Ar 1 的点以（6至14）°C / sec的冷却速度降至≤500°C，通过这种钢板，热影响区的整个区域的韧性大焊接热输入≥30kj/ mm焊接热输入通过0°C调整为≥47J。夏比吸收能。通过这种方法，可获得590N / mm 2 级焊接结构钢板，在大的热输入焊接时，HAZ的韧性极好，屈服比≤80％。 ：（C）1998，日本特许厅
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