An ASTM A216 WCB Control Valve is made from WCB material, which stands for "Weldable Cast B-grade Steel." This material is a type of cast steel where carbon is the primary alloying element. WCB refers to cast steel that is suitable for welding and does not undergo eutectic transformation during solidification. The ASTM A216 standard specifies this material for use in valves, ensuring that the control valve is durable and reliable for various applications. The WCB castings are used for applications that require strength and the ability to withstand high pressures and temperatures.