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JIS G3115 SPV490 Pressure Vessel And Boiler Steel Plate Chemical Composition and Mechanical Property Grade C% SI% Mn% P% S% SPV490 0.2 0.8 1.7 0.02 0.01 ≤0.18 ≤0.75 ≤0.16 ≤0.030 ≤0.030 Steel Grade ...