PURPOSE:To obtain a thick-walled high-tensile steel for welding construction excellent in SR cracking resistance after welding and having high toughness, by specifying the composition of a steel in which amounts of hardenable elements such as C, Cr, Mo, V, etc., and S as an impurity are controlled. CONSTITUTION:The steel for welding construction of =100mm thick having =80kgf/mm2 tensile strength has a composition consisting of, by weight, 0.08-0.12% C, =0.20% Si, 0.5-1.0% Mn, =0.001% S, 1.5-2.0% Ni, =0.50% Cr, 0.3-0.7% Mo, 0.02-0.04% V, 0.015-0.04% Al, 0.0005-0.0040% B, and the balance Fe with inevitable impurities. In this way, the thick-walled high- tensile steel for welding construction in which occurrence of SR cracking as well as low-temp. cracking in welding is prevented can be obtained.
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机译：用途：通过指定钢中的硬化成分（例如C，Cr，Mo，V等可硬化元素的量）来获得一种具有优良的焊接后抗SR开裂性并具有高韧性的厚壁高强度焊接用钢。例如，控制S作为杂质。组成：≥100mm厚的抗拉强度≥= 80kgf / mm 2的焊接结构用钢，其成分为重量百分比0.08-0.12％的碳，硅成分= 0.20％的锰，锰0.5-1.0％的锰， <= 0.001％S，1.5-2.0％Ni，<= 0.50％Cr，0.3-0.7％Mo，0.02-0.04％V，0.015-0.04％Al，0.0005-0.0040％B和余量的Fe不可避免地带有杂质。以此方式，用于焊接结构的厚壁高强度钢在其中发生SR开裂以及低温。可以防止焊接中的裂纹。
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