Chrome-Moly / Alloy Steel Valve Materials
Chrome-molybdenum (alloy) steels are designed for high-temperature and high-pressure service such as power-plant steam and refinery hydroprocessing. Added chromium and molybdenum give creep strength and oxidation resistance well above the limits of plain carbon steel.
When do you use chrome-moly / alloy steel valve materials?
Chrome-molybdenum (alloy) steels are designed for high-temperature and high-pressure service such as power-plant steam and refinery hydroprocessing. Added chromium and molybdenum give creep strength and oxidation resistance well above the limits of plain carbon steel. This family includes 8 grades in our material library, listed below with their service-temperature limits and common designations.
| Grade (ASTM) | Common Name | Form | Min °C | Max °C |
|---|---|---|---|---|
| ASTM A182 F91 | P91 Chrome-Moly (9Cr-1Mo-V) | forged | -18 | +650 |
| ASTM A217 C12A | Grade 91 Cast Steel (C12A) | cast | -29 | +650 |
| ASTM A217 Grade WC6 | 1¼Cr½Mo Alloy Steel WC6 | cast | -29 | +595 |
| ASTM A217 WC9 | Chrome-Moly WC9 (2.25Cr-1Mo) | cast | -18 | +593 |
| ASTM A182 F22 (2¼Cr-1Mo) | F22 Chrome-Moly Alloy Steel | forged | -29 | +593 |
| ASTM A182 F5 | 5Cr-0.5Mo Alloy Steel (Grade F5) | forged | -29 | +593 |
| ASTM A182 F11 | 1.25Cr-0.5Mo Alloy Steel (F11) | forged | -29 | +540 |
| ASTM A217 WC11 (1¼Cr-½Mo) | WC11 Chrome-Moly Alloy Steel | cast | -29 | +538 |
Other alloy families
Connected Engineering
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Browse all grades in the valve material library.