YUHONG HOLDING GROUP CO., LTD
| Payment Terms | TT, LC |
| Supply Ability | According to Clients' requirements |
| Delivery Time | Generally within 30 Days |
| Packaging Details | Ply-wooden Cases/Pallets |
| Product Name | 180 Degree Return Bend/180 Degree Elbow |
| Specification | ASTM A403 |
| Material | WP321H-S |
| Radius | LR or SR (Depend on Customer's Requirements) |
| Surface | Sand Tumbling or Sand Blasting |
| Test | Size Inspection, NDE Test... |
| Size Standard | ASME B16.9 |
| Application | High-Temperature & Corrosive Environments; Food & Pharmaceutical Industries; Aerospace & Automotive Exhaust Systems; Nuclear & Cryogenic Applications... |
| Brand Name | Yuhong |
| Model Number | ASTM A403 WP321H-S |
| Certification | ABS, BV, DNV, CCS, LR |
| Place of Origin | China |
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Product Specification
| Payment Terms | TT, LC | Supply Ability | According to Clients' requirements |
| Delivery Time | Generally within 30 Days | Packaging Details | Ply-wooden Cases/Pallets |
| Product Name | 180 Degree Return Bend/180 Degree Elbow | Specification | ASTM A403 |
| Material | WP321H-S | Radius | LR or SR (Depend on Customer's Requirements) |
| Surface | Sand Tumbling or Sand Blasting | Test | Size Inspection, NDE Test... |
| Size Standard | ASME B16.9 | Application | High-Temperature & Corrosive Environments; Food & Pharmaceutical Industries; Aerospace & Automotive Exhaust Systems; Nuclear & Cryogenic Applications... |
| Brand Name | Yuhong | Model Number | ASTM A403 WP321H-S |
| Certification | ABS, BV, DNV, CCS, LR | Place of Origin | China |
| High Light | Stainless 180 Degree Return Bend ，ASTM A403 Return Bend ，ASTM A403 WP321H-S Return Bend | ||
ASTM A403 WP321H-S Stainless Steel 180 Degree Return Bend For Oil & Gas Refineries
The A403 WP321H-S 180° Elbow is a high-performance pipe fitting designed for demanding industrial applications. Below is a detailed breakdown of its specifications, material properties, and typical uses:
1. Definition & Specifications
Standard: ASTM A403 (Standard for wrought stainless steel fittings for pressure piping).
Grade: WP321H (321H Stainless Steel, "H" denotes high carbon content for elevated temperature service).
Type: 180° Elbow (U-shaped bend that reverses flow direction by 180 degrees).
"S" Suffix: Indicates seamless construction (superior for high-pressure/temperature applications).
2. Material Properties (321H Stainless Steel)
Composition: Austenitic stainless steel with titanium (Ti) added to prevent chromium carbide precipitation (resists sensitization during welding/high-temp exposure).
Key Features:
(a) Chemical Composition (ASTM A403 / ASTM A182 WP321H)
The chemical composition of 321H stainless steel must meet the following limits (weight %):
| Element | Composition Range (%) |
| Carbon (C) | 0.04 – 0.10 (High carbon for high-temp strength) |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.0 – 20.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5×C% (min. 0.40) (Ti stabilizes against sensitization) |
| Iron (Fe) | Balance |
Key Notes on Composition:
Titanium (Ti) prevents chromium carbide precipitation (sensitization) during welding or high-temp exposure.
Higher carbon (C) improves creep resistance at elevated temperatures compared to standard 321.
(b). Mechanical Properties (ASTM A403 / ASTM A182 WP321H)
| Property | Value (Typical) |
| Tensile Strength (UTS) | ≥ 515 MPa (75 ksi) |
| Yield Strength (YS) | ≥ 205 MPa (30 ksi) |
| Elongation (% in 50mm) | ≥ 30% |
| Hardness (Brinell HB) | ≤ 201 HB (Annealed) |
| Impact Resistance | Good (Charpy V-notch tested for low-temp apps) |
High-Temperature Performance:
Max Operating Temp: ~900°C (1650°F) (continuous service).
Oxidation Resistance: Excellent due to high Cr content.
Creep Strength: Superior to 304H/316H at temps above 600°C (1112°F).
3. Why Choose a Seamless ("S") 180° Elbow?
4. Comparison to Similar Grades
| Feature | 321H (WP321H-S) | 304H (WP304H-S) | 347H (WP347H-S) |
| Stabilizer | Titanium (Ti) | None | Niobium (Nb) |
| Max Temp | ~900°C (1650°F) | ~815°C (1500°F) | ~980°C (1800°F) |
| Best For | Welded high-temp apps | General high-temp use | Extreme heat (e.g., furnaces) |
5. Key Applications
Due to its corrosion resistance and high-temperature stability, this elbow is commonly used in:
a) High-Temperature & Corrosive Environments
b) Food & Pharmaceutical Industries
c) Aerospace & Automotive Exhaust Systems
d) Nuclear & Cryogenic Applications
Conclusion
The A403 WP321H-S 180° elbow is a critical component for systems requiring heat resistance, corrosion protection, and high structural integrity, especially in power generation, oil/gas, and chemical industries. Its seamless construction and titanium stabilization make it a reliable choice for extreme conditions.
Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
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. &n... 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. &n...
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