Stainless Steel Elbow A403 WP321H For High Temperature Piping Systems
A403 WP321H Stainless Steel Elbow - High-Temperature Corrosion Resistant Pipe Fitting
Product Introduction
A403 WP321H Stainless Steel Elbows are ASME B16.9/B16.25 compliant butt-weld fittings engineered for extreme environments. The addition of Titanium (Ti) stabilizes the alloy against carbide precipitation, making it ideal for continuous high-temperature service (450°C–900°C) and corrosive media. These elbows are solution-annealed & quenched to maximize intergranular corrosion resistance in acidic, chloride-rich, and oxidizing conditions.
Key Advantages
Superior Heat Resistance – Maintains structural integrity up to 900°C
Stress Corrosion Cracking (SCC) Resistance – Critical for chemical/petrochemical applications
ASTM A403 & ASME B16.9 Certified – Guaranteed dimensional/tolerance compliance
Weld-Ready Design – Beveled ends ensure full-penetration weld integrity
Chemical Composition (ASTM A403 WP321H)
| Element | Content (%) | Function |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Controls strength & hardness |
| Chromium (Cr) | 17.0–19.0 | Corrosion/oxidation resistance |
| Nickel (Ni) | 9.0–12.0 | Austenite stability & toughness |
| Manganese (Mn) | ≤ 2.00 | Deoxidization & sulfur control |
| Silicon (Si) | ≤ 1.00 | Deoxidization & fluidity |
| Phosphorus (P) | ≤ 0.045 | Impurity control |
| Sulfur (S) | ≤ 0.030 | Machinability improvement |
| Titanium (Ti) | ≥ 5xC min | Prevents sensitization during welding |
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A403 / ASME SA403 |
| Grade | WP321H (Wrought Product, High-Temperature Service) |
| Dimensions | ASME B16.9: 1/2" to 48" (DN15–DN1200) |
| Angles | 90°, 45°, 180° (LR/SR options) |
| Wall Thickness | Sch 5S, 10S, 40S, 80S, 160S |
| Surface Finish | Pickled & Passivated (ASTM A380) |
| Testing | Hydrostatic Test, PMI, RT (per EN 10204 3.1/3.2) |
Applications
Engineered for Demanding Industrial Service
- Petrochemical: Crackers, reformers, FCC units (resists sulfidation)
- Chemical Processing: Acid reactors, nitric acid condensers
- Power Generation: Boiler superheaters, steam lines (>500°C)
- Pharmaceutical: USP/EP-compliant CIP/SIP systems
- Nuclear: Secondary cooling circuits (ASME III qualified)
- Pulp & Paper: Digester liquor handling
Get in Touch
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