ASME SA213 TP347H Niobium Stabilized Superheater Tube 50.8mm OD for USC Boiler
ASME SA213 TP347H is a niobium-stabilized austenitic stainless steel designed for elevated temperature service in ultra-supercritical (USC) boiler superheaters and reheaters. The niobium stabilization prevents chromium carbide precipitation during welding and high-temperature operation, ensuring superior resistance to intergranular corrosion and sensitization.
- Niobium Stabilized: Eliminates sensitization risk during welding, no post-weld heat treatment required
- High-Temperature Strength: Superior creep rupture strength compared to TP304H and TP321H at temperatures above 600°C
- Oxidation Resistance: Excellent resistance to steam oxidation and flue gas corrosion in USC boiler environments
- Long Service Life: Proven track record in supercritical and ultra-supercritical power plants worldwide
- Full Traceability: EN 10204 3.1 / 3.2 certification with complete chemical and mechanical test reports
| Parameter | Specification |
|---|---|
| Material Standard | ASME SA213 / ASTM A213 TP347H |
| UNS Designation | S34709 |
| Chemical Composition | C: 0.04-0.10, Cr: 17.0-19.0, Ni: 9.0-13.0, Nb: 8xC-1.0% |
| Tensile Strength | ≥515 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥35% |
USC boiler superheater tubes, reheater tubes, header connections, high-temperature steam piping, and pressure parts in thermal and combined cycle power plants.
100% ultrasonic and eddy current testing, PMI verification, hydrostatic pressure testing per ASME standards. EN 10204 Type 3.1 certificates provided as standard; Type 3.2 available with third-party inspection.
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