gangye-valve
https://www.gangye-valve.com/products/wc9-valve-body-material.html
WC9 valve body material is a specific material designation used in valve manufacturing. WC9 material equivalent refers to a cast version of chrome-molybdenum steel, also known as ASTM A217 Grade C12. It is a high-temperature alloy with excellent strength and corrosion resistance, with an operating temperature range of -29°C to 593°C.