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METHOD FOR PRODUCING THICK HIGH-STRENGTH STEEL PLATE EXCELLENT IN TOUGHNESS AND THICK HIGH-STRENGTH STEEL PLATE EXCELLENT IN TOUGHNESS
METHOD FOR PRODUCING THICK HIGH-STRENGTH STEEL PLATE EXCELLENT IN TOUGHNESS AND THICK HIGH-STRENGTH STEEL PLATE EXCELLENT IN TOUGHNESS
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机译：生产高韧性高强度钢板的方法和高韧性高强度钢板的方法
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摘要
PROBLEM TO BE SOLVED: To provide a thick steel plate simultaneously satisfying high basic material strength, good toughness at the center part in the thickness, good large heat-input weld HAZ (Heat Affect Zone) toughness and high rolling efficiency at high dimensions.;SOLUTION: To a cast slab composed of 0.01-0.07% C, ≤0.2% Si, 0.2-1.8% Mn, ≤0.015% P, 0.0005-0.005% S, 0.0003-0.003% B, 0.02% to 0.06% Nb, 0.001-0.0034% Al, 0.005-0.02% Ti, 0.001-0.008% N, 0.001-0.004% O and further, one or more kinds of 0.0003-0.004% Ca and 0.003-0.004% Mn and satisfying a prescribed condition to the effective B content and Ceq, rough rolling is applied after cooling to Ar3-200°C and then successively reheating at 1000-1250°C and thereafter, a finish-rolling satisfying the following the formula (3) is applied at 800-900°C and further, thereafter, an accelerating cooling is performed from ≥Ar3 point temperature.;COPYRIGHT: (C)2008,JPO&INPIT
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机译：要解决的问题：提供一种厚钢板，同时满足高基本材料强度，厚度中心部位的良好韧性，大尺寸热输入焊接HAZ（热影响区）的韧性以及高尺寸时的高轧制效率。解决方案：对于由0.01-0.07％C，0.2％Si，0.2-1.8％Mn，0.015％P，0.0005-0.005％S，0.0003-0.003％B，> 0.02％至0.06％组成的铸坯Nb，0.001-0.0034％的Al，0.005-0.02％的Ti，0.001-0.008％的N，0.001-0.004％的O以及0.0003-0.004％的Ca和0.003-0.004％的Mn中的一种或多种并且满足规定条件在有效B含量和Ceq的基础上，冷却至Ar 3 -200＆C之后进行粗轧，然后在1000-1250＆C进行连续再加热，然后进行满足以下公式的精轧（ 3）在800-900°C的温度下施加，然后从＆ge; Ar 3 点温度进行加速冷却。;版权所有：（C）2008，JPO＆INPIT
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