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GB3531 16MnDR Pressure Vessel And Boiler Steel Plate Chemical Composition and Mechanical Property Grade C% SI% Mn% Ni% Mo% V% Nb% Alt% P%, max S%, max 16MnDR ≤O.20 0.15-0.50 1.2-1.6 ≤O.40 ≥0.020 0.02 ...