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GB713 Q345R Pressure Vessel And Boiler Steel Plate Chemical Composition and Mechanical Property Grade C% SI% Mn% Cr% Ni% Mo% Nb% V% P% S% Alt% Q345R ≤O.20 ≤0.55 1.20-1.60 ≤0.025 ≤0.015 ≥0.020 Steel ...