ASTM A234 WP11 Elbow Tee Redcuer Caps Butt Weld Fitting Specification
ASTM A234 WP11 is the standard specification for wrought alloy steel butt weld pipe fittings used in high-temperature and pressure piping systems.
This page provides an overview of ASTM A234 WP11 buttweld fittings and offers a PDF specification for engineering, procurement, and EPC projects.
What is ASTM A234 WP11?
ASTM A234 WP11 covers chromium-molybdenum alloy steel butt weld fittings designed for elevated temperature service.
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Material: 1.25Cr–0.5Mo alloy steel
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Product form: Butt weld fittings
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Applicable for pressure piping and boiler systems
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Dimensional standards: ASME B16.9 / B16.28
ASTM A234 WP11 Butt Weld Fittings Products range
The ASTM A234 WP11 specification applies to the following fitting types:
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WP11 Elbow (45°, 90°, Long Radius & Short Radius)
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WP11 Tee (Equal Tee & Reducing Tee)
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WP11 Reducer (Concentric & Eccentric)
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WP11 Cap
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WP11 Cross (when specified)
All fittings are manufactured by hot forming, welding, or forging, followed by mandatory heat treatment.
Chemical Composition – ASTM A234 WP11 (Typical)
| Grade and Marking |
Composition, % | |||||||||
| Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Molybdenum | Nickel | Copper | Others | |
| WP11 CL1 | 0.05–0.15 | 0.30–0.60 | 0.030 | 0.030 | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 | … | … | … |
| WP11 CL2,WP11 CL3 | 0.05–0.20 | 0.30–0.80 | 0.040 | 0.040 | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 | … | … | … |
Mechanical Properties
| Property | WP11 CL1 | WP11 CL2 | WP11 CL3 |
| Tensile strength, min ksi [MPa] | 60 [415] | 70 [485] | 75 [520] |
| Yield strength, min ksi [MPa] | 30 [205] | 40 [275] | 45 [310] |
Heat Treatment Requirements
ASTM A234 WP11 fittings shall be supplied in the:
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Normalized and Tempered (N&T) condition
This heat treatment ensures:
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High-temperature strength
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Improved creep resistance
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Stable microstructure for long-term service
Hardness Limit
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Maximum hardness: 235 HB
Testing & Inspection
ASTM A234 WP11 fittings are supplied with:
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Chemical composition analysis
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Mechanical testing
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Heat treatment verification
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Dimensional inspection
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Visual & surface inspection
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EN 10204 3.1 Mill Test Certificate
Size Range & Dimensions
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Nominal Pipe Size (NPS): ½″ – 48″
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Wall Thickness: SCH 10 – SCH XXS
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Dimensions: ASME B16.9
Typical Applications
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Power plant piping systems
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Boilers & heat recovery units
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Petrochemical & refinery piping
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High-temperature pressure systems
Download ASTM A234 WP11 Specification PDF
📄 ASTM A234 WP11 Butt Weld Fittings – Technical PDF Datasheet
✔ Chemical composition
✔ Mechanical properties
✔ Heat treatment
✔ Hardness limits
✔ Testing requirements
✔ Elbow / Tee / Reducer / Cap dimensions
👉 [Download ASTM A234 WP11 butt weld fititngs Specification PDF]