Advanced Alloy Steel Valve Castings for Extreme Conditions

WC9 (ASTM A217 WC9), as a representative of 2¼ Cr-1Mo alloy cast steel, its outstanding high-temperature performance stems from the precise alloy ratio and is specially designed for high-temperature and high-pressure working conditions up to 621 ° C (1150 ° F). In terms of composition, the 2.0-2.5% chromium element is the core for resisting high-temperature oxidation. It can quickly form a dense and stable Cr₂O₃ oxide film on the material surface. Even in a long-term high-temperature environment, it can effectively prevent the erosion of oxygen and corrosive media, significantly reduce the oxidation rate, and ensure that the material maintains structural integrity under fluctuating thermal loads. The molybdenum content of 0.9% to 1.1% significantly enhances the high-temperature strength and creep resistance of the material through solid solution strengthening. Under the working condition of 600℃, its creep fracture strength far exceeds that of ordinary carbon steel, and it can withsta…