Valve Material Reference
ASTM A217 Grade WC6 Valve
1¼Cr½Mo Alloy Steel WC6ASTM A217 Grade WC6 is a 1.
Form
Cast
Max Temp
+595°C (+1100°F)
Min Temp
−29°C (−20°F)
Category
Alloy Steel
Chemical Composition — ASTM A217 Grade WC6
Temperature Range
+399°C to +595°C (+750°F to +1100°F)
Maximum Temperature
+595°C (+1100°F)
Minimum Temperature
−29°C (−20°F)
Equivalent Grades — ASTM A217 Grade WC6
| Standard | Equivalent Grade |
|---|---|
| ASTM | A217 WC6 |
| EN | GX12CrMo5 / 1.7357 |
| DIN | GS-17CrMo 5 5 |
| BS 1504 | 625 |
Suitable Services
Steam service 400–595°C (power generation, refinery steam headers)
High-temperature hydrocarbon vapour service
Catalytic reformer and hydrotreater hot section
Ethylene cracker transfer line valves
Not Suitable For
Temperatures above 595°C — use A217 C12A or P91 forgings
Cryogenic service (use LCC)
Oxidising acids — chrome-moly has limited acid resistance
Wet H₂S without NACE compliance
Valve Body Applications
Steam turbine inlet stop valves and control valves
HP steam bypass and extraction valves
Refinery hot section valves: atmospheric and vacuum distillation overhead
Coker and FCC unit valves in the 425–595°C range
Trim Applications
Seat rings: 13Cr (410SS) with Stellite hard-facing (Trim 12)
Stem: 13Cr or 17-4PH stainless steel
Typical Valve Types in ASTM A217 Grade WC6
Gate valves: ASME Class 300–2500, steam and hot hydrocarbon service
Globe valves: HP steam service, ASME Class 300–1500
Check valves: boiler feed water, steam drum
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We supply ASTM A217 Grade WC6 (1¼Cr½Mo Alloy Steel WC6) gate valves, globe valves, ball valves, check valves, and more. Full certification documentation — EN 10204 3.1/3.2 MTCs, hydro test certs — as standard.