The meaning of WCB on the valve

The WCB is written on the valve to indicate the valve body material, and the other parts of the valve may be other materials. WCB refers to the WCB grade in ASTM A216, which is a carbon steel casting (W-weldable: the first letter of the welding, indicating that the material has good welding properties; C-cast steel: the first letter of cast steel; B—the mechanical properties of the steel is grade B) are combined: the weldable cast steel with mechanical properties of grade B. It is ordinary carbon steel, equivalent to 25 or 35 carbon steel.