ASTM A234 WP22-S 180 Degree Elbow/ Return Bend For Refinery Process Piping

ASTM A234 WP22-S 180 Degree Elbow/ Return Bend For Refinery Process Piping

An ASTM A234 WP22 180-Degree Elbow is a high-performance, alloy steel, U-turn pipe fitting used to change the direction of flow in high-temperature and high-pressure piping systems. Its specific material composition (Chrome-Moly) makes it strong, durable, and resistant to heat, oxidation, and creep, ensuring the safety and integrity of critical industrial infrastructure.

Here are some detailed breakdowns:

1. Chemical Composition (Heat Analysis) of ASTM A234 WP22

The chemical composition is the key factor that defines the WP22 grade. The values are percentages by weight.

Note: The material must also conform to the rules for product analysis tolerances as specified in the ASTM A234 specification.

2. Mechanical Properties of ASTM A234 WP22

These properties are the minimum required for the material after undergoing the appropriate heat treatment (normalize and temper, or anneal).

Important Notes on Mechanical Properties:

• Test Specimens: The test specimen must conform to the required dimensions specified in ASTM A234.
• Heat Treatment: WP22 fittings are supplied in the normalized and tempered or annealed condition to achieve these mechanical properties and a suitable microstructure for service.
• Hardness: While not always a required minimum property, maximum hardness limits may be specified (e.g., 197 Brinell HBW max is common for P22 material) to ensure good weldability and service performance.

3. Key Characteristics and Manufacturing

• Connection Method: Butt-Weld. The ends of the elbow are bevelled to match the pipe, allowing for a full-penetration weld. This creates a smooth bore and the strongest possible connection.
• Size Range: Available in a wide range of sizes, from small (e.g., 1/2 inch) to very large (e.g., 48 inches) Nominal Pipe Size (NPS).
• Schedule / Wall Thickness: They are manufactured to match the wall thickness of the pipe they connect to (e.g., Schedule 40, 80, 160, XXS).
• Center-to-End Dimension: The most common standard for dimensions is ASME B16.9, which defines the precise center-to-center distance for a 180-degree elbow.

4. Why This Specific Fitting is Chosen (The "Why")

The application is dictated by the synergy of its three features:

5. Common Applications

This fitting is used in demanding industrial environments where high temperature and pressure are present:

• Power Generation: Main steam lines, reheat lines, and other critical piping in coal, nuclear, and natural gas power plants.
• Oil & Gas Refineries: Refinery process piping, heater tubes, and catalytic cracking units.
• Petrochemical Plants: Processing equipment that operates at elevated temperatures and pressures.
• Boiler Systems: Piping systems connecting various parts of industrial boilers.

Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories,  the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

Our factories main products as below : 
Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

Yuhong Holding Group also has gained rich experience for project package( products contain:Pipes, Fittings, Flanges, heat exchanger, furnace, fired heater, air cooler, boiler) , YUHONG brand has marked its global presence in more than 85 countries, like, Korea, USA, Canada, Mexico, Colombia, Bolivia, Chile, Argentina, Brazil, Ecuador, Austria, New Zealand, Singapore, Malasyia, Indonesia, Thailand, Vietnam, Ukraine, Turkey,Sauid Arabia, Qatar, U.A.E,Israel,India, UK, France, Italy, Gernmany, Poland, Spain,... We have successfully implemented the orders of Cross Country Pipelines for our valuable customers. In addition, we have also developed a huge network of contacts and strategic alliances with most important manufacturers as stockists around the world.