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STEEL FOR HIGH HEAT INPUT WELDING AND METHOD FOR REFINING STEEL FOR HIGH HEAT INPUT WELDING
STEEL FOR HIGH HEAT INPUT WELDING AND METHOD FOR REFINING STEEL FOR HIGH HEAT INPUT WELDING
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机译:高热输入焊接用钢及高热输入焊接用钢的精炼方法
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摘要
PROBLEM TO BE SOLVED: To produce a steel sheet which has excellent toughness in a heat affected zone even on high heat input welding, and to provide a method for preparing molten steel used for the stock therefor. ;SOLUTION: The steel has composition containing, by mass, 0.01 to 0.15% C, 0.05 to 0.80% Si, 0.5 to 2.0% Mn, 0.01 to 0.06% Al, 0.003 to 0.013% rare earth elements and ≤0.005% S, and the balance iron with inevitable impurities. Grains consisting of the oxides and/or sulfides of rare earth elements are dispersed therein in ≥107 pieces/cm2, and the grain size thereof is controlled to ≤500 nm.;COPYRIGHT: (C)2003,JPO
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