ASTM A403 WP304H-S Stainless Steel 180 Degree Return Bend For Power Plant

ASTM A403 WP304H-S Stainless Steel 180 Degree Return Bend For Power Plant

The 180-degree return bend is a specific type of pipe fitting used to change the direction of pipe flow by 180 degrees.
- It forms a U-shaped curve, reversing the flow direction completely.
- These bends are commonly used in applications such as heat exchangers, condensers, and complex piping systems that require compact designs.

ASTM A403 WP304H-S 180° Return Bend is a type of stainless steel pipe fitting used in high-temperature and corrosive environments. Here's a detailed breakdown:

1. Material ASTM A403 WP304H

Chemical Composition (ASTM A403 / ASME SA403 WP304H)

The composition complies with ASTM A403 (wrought fittings) and matches ASTM A182 F304H (forged fittings) and ASTM A312 TP304H (pipe).

Key Notes:

• Higher carbon (0.04–0.10%) improves creep resistance at elevated temperatures (compared to 304/304L).
• Low sulfur/phosphorus enhances weldability and corrosion resistance.

Mechanical Properties (ASTM A403 WP304H-S)

Meets ASTM A403 for solution-annealed (softened) condition.

Key Notes:

• High ductility (≥35% elongation) ensures good formability.
• Solution annealing (quenching) ensures optimal corrosion resistance.
• Hardness limits prevent brittleness in welded/pressurized systems.

2. Type: 180° Return Bend

A U-shaped pipe fitting that redirects flow by 180 degrees, commonly used in:

Heat exchangers

Boiler systems

Refineries & chemical plants

Available in short-radius (SR) or long-radius (LR) configurations.

The ASTM A403 WP304H-S Stainless Steel 180° Return Bend is designed for high-temperature and corrosive environments, leveraging the superior creep resistance and strength of 304H stainless steel. Below are its key applications:

1. High-Temperature Steam & Power Plants

Boiler systems: Handles high-pressure steam (500°C+/932°F+) due to 304H’s enhanced carbon content (0.04–0.10% C) for creep resistance.

Heat exchangers: Used in U-bend sections where steam or hot fluids change direction.

Turbine bypass systems: Manages extreme thermal cycling.

2. Petrochemical & Refining

Cracker units: Withstands corrosive hydrocarbons and sulfur compounds at elevated temps.

Refinery piping: Transfers hot oils, gases, and acids (resists oxidation and scaling).

Catalytic reforming systems: 304H’s austenitic structure resists carburization.

3. Chemical Processing

Acid/alkali transport: Resists nitric acid, organic acids, and dilute chlorides (but not highly reducing acids like sulfuric).

Polymer production: Used in high-temp reaction loops.

4. Food & Pharmaceutical

Sanitary process lines: Smooth 180° return bends prevent bacterial buildup (polished finishes available).

Sterilization systems: Handles superheated steam cleaning.

5. Nuclear & Energy

Auxiliary coolant lines: 304H’s stability suits moderate radiation environments (not for core components).

Geothermal plants: Resists scaling from mineral-rich brines.

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.