A234 WP11 / WP22 Chrome-Moly Manufacturer & Supplier
Creep resistant chrome-molybdenum fittings for elevated temperature service. WP11 (1.25Cr-0.5Mo) and WP22 (2.25Cr-1Mo) hold strength where carbon steel has already crept — boiler, superheater, refinery and hydrogen lines.
UNS: ASTM A234 WP11 / WP22 | Category: Chrome-Moly Fittings
Size Range
Outer Diameter: NPS 1/2 to 36 · SCH 20 to SCH 160 and XXS
Chemical Composition (%)
| Cr | Mo | C |
|---|---|---|
| 1.00-1.50 (WP11) / 1.90-2.60 (WP22) | 0.44-0.65 (WP11) / 0.87-1.13 (WP22) | 0.05-0.15 |
Mechanical Properties
- Tensile Strength
- 415-585 MPa (WP11), 415 MPa min (WP22)
- Yield Strength
- 205-220 MPa min
- Elongation
- 20% min
- Hardness
- 197 HBW max
Applicable Standards
- ASME B16.9
- ASME B16.28
- MSS SP-75
- ASME B31.3
- EN 10204 3.1
Applications
- Boiler and superheater piping
- Refinery hydro-processing lines
- High temperature steam headers
- Hydrogen service piping
- Power plant main steam and hot reheat lines
Industries Served
- Oil & Gas
- Chemical & Petrochemical
- Power & Energy
- Fertiliser
- Water & Desalination
- Pharmaceutical
Equivalent Grades
- ASTM A234 WP11
- ASTM A234 WP11
- ASTM A234 WP22
- ASTM A234 WP22
- 1.7335
- 1.7335
- 1.7380
- 1.7380
- 10CrMo9-10
- 10CrMo9-10