YUHONG HOLDING GROUP CO., LTD
YUHONG HOLDING GROUP CO., LTD
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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).
| Element | Composition (% Weight, max unless specified) |
| Carbon (C) | 0.04 – 0.10 (higher C for high-temp strength) |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 11.00 |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance (~66-74%) |
Key Notes:
Mechanical Properties (ASTM A403 WP304H-S)
Meets ASTM A403 for solution-annealed (softened) condition.
| Property | Value |
| Tensile Strength (UTS) | ≥ 515 MPa (75 ksi) |
| Yield Strength (YS) | ≥ 205 MPa (30 ksi) |
| Elongation (% in 50mm) | ≥ 35% (minimum) |
| Hardness (Brinell/Rockwell) | HBW ≤ 201 / HRB ≤ 92 |
| Impact Test (Charpy V-Notch) | Not typically required (unless specified for low-temp use) |
Key Notes:
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.
