ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service   Grade: WP12   Chemical Requirements Composition, % Grade WP12 CL1 C 0.05-0.20 Mn 0.30-0.80 P 0.045 S 0.045 Si 0.60 Cr 0.80-1.25 Mo 0.44-0.65   Tensile Requirements Grade WP12 CL1 WP12 CL2 Tensile strength, MPa 415–585 485-655…