Elbow
ASTM A234 WP11 Alloy Steel Elbow is a chromium-molybdenum alloy steel butt weld fitting manufactured in accordance with ASTM A234 / ASME SA234 and ASME B16.9 for high-temperature and moderate hydrogen service environments.
Product Overview
ASTM A234 WP11 Alloy Steel Elbow is a chromium-molybdenum alloy steel butt weld fitting manufactured in accordance with ASTM A234 / ASME SA234 and ASME B16.9 for high-temperature and moderate hydrogen service environments.
Based on a 1.25Cr-0.5Mo alloy system, WP11 alloy steel elbows provide a balanced combination of high-temperature strength, oxidation resistance and weldability, making them suitable for refinery process piping and hydrogen-containing service.
WP11 is a widely used alloy steel grade for hydrogenation units, hydrocrackers and high-temperature refinery piping operating at temperatures up to approximately 575°C.
Hongcheng supplies ASTM A234 WP11 alloy steel elbows in normalized and tempered condition, with full material traceability, inspection documentation and project-specific technical support.
Material & Heat Treatment
ASTM A234 WP11 shares the same 1.25Cr-0.5Mo alloy system as ASTM A335 P11 seamless pipe and ASTM A182 F11 forgings, which are extensively applied in refinery and petrochemical industries.
Key alloying elements include:
Chromium (Cr)
Molybdenum (Mo)
Manganese (Mn)
Silicon (Si)
Carbon (C)
Chromium provides oxidation resistance, while molybdenum enhances high-temperature strength and resistance to hydrogen attack under moderate hydrogen partial pressures.
Typical heat treatment includes:
Normalizing: 900–1000°C
Tempering: 675–775°C
This produces a stable tempered microstructure suitable for long-term operation in hydrogen-containing and high-temperature process environments.
Manufacturing Process
Steel Billet / Forging Stock → Heating → Hot Forming → Sizing & Calibration → Normalizing & Tempering → UT & MT Inspection → Beveling → Marking → Packing
Hongcheng applies strict manufacturing controls throughout forming, heat treatment and inspection processes to ensure dimensional accuracy, material integrity and consistent performance of every WP11 alloy steel elbow.
Technical Parameters
|
Parameter |
Value |
|
Grade |
ASTM A234 WP11 |
|
Product Type |
Alloy Steel Butt Weld Elbow |
|
Applicable Standards |
ASTM A234 / ASME SA234, ASME B16.9 |
|
Angle |
15°, 22.5°, 30°, 45°, 60°, 90°, 180° |
|
Outside Diameter |
1/2"–48" (DN15–DN1200) |
|
Wall Thickness |
SCH 40, SCH 80, SCH 160, XXS and Custom |
|
Bend Radius |
Long Radius (1.5D) / Short Radius (1D) |
|
Heat Treatment |
Normalized & Tempered |
|
End Type |
Beveled Ends (ASME B16.25) |
|
Surface |
Black Painted / Anti-rust Oil / Natural Finish |
|
Customization |
Custom Angles, Dimensions and Radii Available |
Inspection & Testing
Every ASTM A234 WP11 alloy steel elbow is inspected throughout production to ensure compliance with ASTM A234, ASME SA234, dimensional requirements and customer specifications.
Available inspections and testing include:
EN 10204 Type 3.1 Material Test Certificates (MTC) are available for each production batch.
Third-party inspection, additional non-destructive testing and project-specific documentation can be provided according to customer requirements.
Applications
ASTM A234 WP11 alloy steel elbows are widely used in:
• Hydrogenation units and hydrocrackers
• Refinery high-temperature process piping
• Petrochemical reactor feed lines
• Catalytic reformer systems
• High-temperature heat exchanger piping
• Coal chemical process units
WP11 alloy steel elbows are selected for applications requiring a balance of high-temperature strength, weldability and moderate hydrogen resistance under elevated-temperature service conditions.
For hydrogen service applications, material selection and heat treatment should be confirmed according to API RP 941 (Nelson Curves) and applicable project specifications.
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FAQs
What is the difference between WP11 and WP22?
WP11 and WP22 are both chromium-molybdenum alloy steel grades used for high-temperature refinery service.
WP11 is a 1.25Cr-0.5Mo alloy steel, while WP22 is a 2.25Cr-1Mo alloy steel with higher chromium and molybdenum content.
WP22 provides better high-temperature strength and hydrogen resistance, whereas WP11 offers improved weldability and cost-effectiveness for moderate-temperature and moderate-hydrogen service.
Does WP11 require PWHT?
Yes. Welded WP11 piping systems generally require preheating and post-weld heat treatment (PWHT) according to applicable construction codes, qualified welding procedures and project specifications.
What is the maximum service temperature of WP11?
WP11 is designed for high-temperature service and is commonly applied in systems operating up to approximately 575°C.
For hydrogen service, the allowable temperature and pressure conditions should be verified using API RP 941 (Nelson Curves).
Can custom angles and radii be supplied?
Yes. Hongcheng can manufacture custom WP11 alloy steel elbows according to customer drawings and technical specifications.
What standards are supported?
Products can be manufactured according to ASTM A234, ASME SA234, ASME B16.9 and ASME B16.25.
Wuliyao Industrial Zone, Yanshan County, Cangzhou City, Hebei Province, China.
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