Description
Traceable alloy butt-weld fitting
ASTM A234 WP22 Alloy Steel 90 Degree Long Radius Elbow
A procurement-ready 90-degree long-radius butt-weld elbow in ASTM A234/A234M WP22 chromium-molybdenum alloy steel, supplied for high-temperature refinery, power and petrochemical service with project-defined dimensions, wall, construction and inspection.
What is a WP22 alloy steel 90 degree long radius elbow?
A 90-degree long-radius elbow redirects a pipeline through a smooth 1.5D nominal centerline radius. It is widely used where layout space permits a longer sweep than a short-radius elbow.
WP22 is selected to match approved 2.25Cr-1Mo piping material classes in refineries, power plants and petrochemical facilities. Final acceptance depends on chemistry, mechanical properties, heat treatment, hardness and project welding requirements.
Technical specification
| Product type | 90-degree long-radius butt-weld elbow |
|---|---|
| Material | ASTM A234/A234M WP22 chromium-molybdenum alloy steel |
| Material family | 2.25Cr-1Mo low-alloy steel |
| Dimensional basis | ASME B16.9 90-degree long-radius elbow |
| Configuration | 90-degree long radius; nominal centerline radius 1.5D for standard ASME geometry |
| Nominal size | Standard ASME sizes and schedules; heavy wall and custom tangent lengths subject to review |
| Wall thickness | Standard schedules, heavy wall and project-specific wall subject to manufacturing review |
| Construction | Seamless or welded as applicable, ordered and permitted by the material class |
| End preparation | Butt-weld bevel matched to connecting pipe wall and approved welding detail |
| Heat treatment | In accordance with ASTM A234 and the ordered WP22 grade/class requirements |
| Documentation | EN 10204 3.1 MTC, heat traceability, PMI, dimensions and additional NDE as ordered |
Available size and wall combinations depend on alloy, forming route, construction and quantity. Confirm the exact pipe outside diameter and wall in the RFQ.
Standards and technical references
Dimensional standard
ASME B16.9 covers standard factory-made wrought butt-weld long-radius elbow dimensions, tolerances, marking and related requirements.
Material specification
ASTM A234/A234M covers wrought carbon and alloy steel fittings for moderate and elevated-temperature service.
Why select WP22?
WP22 is considered for superheated steam, hot hydrogen or hydrocarbon process systems, furnace connections and other services whose piping class specifies 2.25Cr-1Mo fittings.
| Selection point | WP22 | WP11 |
|---|---|---|
| Alloy level | Higher Cr-Mo alloy level | Lower Cr-Mo alloy level |
| Typical selection | Compatible 2.25Cr-1Mo piping | Compatible 1.25Cr-0.5Mo piping |
| Heat treatment | Project-controlled and grade-specific | Project-controlled and grade-specific |
| Substitution | Engineering approval required | Engineering approval required |
Typical applications
| Industry | Typical fitting duty | Why this material is considered |
|---|---|---|
| Power generation | Directional change in process and utility piping | High-temperature steam and boiler-associated piping |
| Refining | Equipment connection where a smooth 90-degree sweep is required | Hot process and hydrogen-service material classes where approved |
| Petrochemical | High-integrity welded line routing with standard long-radius geometry | Elevated-temperature process equipment connections |
Application examples are selection context, not a design approval. Confirm process chemistry, pressure, temperature, weld procedure and governing code.
Manufacturing, inspection and documentation
Long-radius elbow manufacture requires control of angle, center-to-end dimension, centerline radius, wall thinning, ovality and bevel geometry. WP22 procurement should define heat treatment, hardness limits, NDE and any hydrogen-service or creep-service requirements.
Heat-number traceability and PMI when specified.
Angle, center-to-end, radius, OD, wall thinning, ovality and bevel checked.
PT, MT where applicable, UT, RT or third-party witnessing to the ordered scope.
MTC, heat-treatment and inspection records compiled to project requirements.
RFQ checklist
- Complete material grade and UNS where applicable
- ASME B16.9 edition or approved project drawing
- Run, outlet and branch sizes
- Schedule or exact wall thickness at every end
- Seamless or welded construction/class
- Bevel detail and matching pipe dimensions
- Quantity, destination and required delivery date
- EN 10204 3.1, PMI, dimensional and NDE requirements
Frequently asked questions
What is a WP22 alloy steel 90 degree long radius elbow?
It is a 90-degree long-radius butt-weld elbow manufactured from ASTM A234/A234M WP22 chromium-molybdenum alloy steel. For standard 90-degree long-radius elbows, the centerline radius is 1.5 times the nominal pipe size. The ordered material specification controls chemistry, mechanical properties, heat treatment and testing.
Which standard applies to this fitting?
ASME B16.9 covers standard factory-made wrought butt-weld long-radius elbow dimensions, tolerances, marking and related requirements. The material basis is ASTM A234/A234M WP22 chromium-molybdenum alloy steel. The purchase order must state the required edition, construction, size, wall and supplementary examinations.
Where is WP22 typically selected?
WP22 is considered for superheated steam, hot hydrogen or hydrocarbon process systems, furnace connections and other services whose piping class specifies 2.25Cr-1Mo fittings. Material suitability still depends on fluid chemistry, pressure, temperature, fabrication, corrosion allowance and the governing piping code.
Can heavy-wall and welded construction be supplied?
Yes, subject to manufacturing review. Provide the exact outside diameter, wall thickness or schedule, construction class, end preparation, quantity and NDE requirements so feasibility can be confirmed.
What should an RFQ include?
State the complete material grade, dimensional standard or approved drawing, run and branch sizes, schedule or exact wall, seamless or welded construction, bevel detail, quantity, destination, certification and inspection scope.
Product image is representative. Surface appearance varies by alloy, manufacturing route and finish.
Request a technical quotation
Send the material, size combination, wall, quantity, drawing or standard, and inspection requirements for review.
