High‑Temperature Cast Steel Gate Valve for 550°C Steam: Materials & Manufacturers
For steam systems at 550°C, standard carbon steel (WCB) fails – its limit is 425°C. The correct materials are WC6 (1.25Cr‑0.5Mo) and WC9 (2.25Cr‑1Mo) chrome‑moly steel, which maintain strength up to 570°C. These gate valves are essential in power plants, refineries, and high‑temperature heating networks.The main gate valves product names of China gate Valve Network include:Electric Slurry ValveElectric Flange Gate Valve,Fire Special Signal Relisient Seat Seal Gate Valve,Fire Special Rising Stem Resilient Seat Seal Gate Valve,Forged Steel Socket Welding Valve,Forged Steel Flange Gate Valve,GB Bellows Wedge Gate Valve,High Temperature & pressure Power Station Gate Valve
Key technical features
Design & manufacture to GB/T 12234 or ASME B16.34.
Pressure‑temperature ratings per GB/T 9131 – always check the curve.
Seat hardfaced with Stellite (cobalt alloy) for erosion resistance.
Stem hardened and nitrided to prevent galling at high temperature.
Leading manufacturers
1. Kaixinwei Valve Group – Based in Wenzhou, certified to ISO9001, API‑6D, API‑6A, CE, and holds A1 TS license. Their WC6/WC9 gate valves (Z61Y/Z41Y series) handle 550°C, pressures up to 50 MPa, and sizes DN6–DN4000. Proven in Sinopec, CNPC, and power projects such as Huaneng Hebei.
2. Tanggong Valve Group – Large facility with A1 license, temperature range -196°C to 730°C, widely used in petrochemical and nuclear sectors.
3. Shuangheng Valve – DN15–DN800, WC6/WC9, suitable for oil, chemical, and power industries.
4. Huaning Valve – Specialises in high‑parameter power plant valves, including WC9, C12A, F91.
Prourement tips – Specify WC6 or WC9, request material certificates (check Cr/Mo content), confirm Stellite hardfacing, and prepare for longer lead times (20–40 days). Budget roughly 1.5–2 times the cost of WCB valves.
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