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GB3531 15MnNiDR Pressure Vessel And Boiler Steel Plate Chemical Composition and Mechanical Property Grade C% SI% Mn% Ni% Mo% V% Nb% Alt% P%, max S%, max 15MnNiDR ≤O.18 0.15-0.50 1.2-1.6 0.20-0.60 ≤O...