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ASTM A533 GRBCL1 Pressure Vessel And Boiler Steel Plate Chemical Composition and Mechanical Property MATERIAL C≤ Mn Si P≤ S≤ Mo Ni A533GRBCL1 0.25 1.07-1.62 013-0.45 0.035 0.035 0.41-0.64 0.37-0.73 ...