ASTM A312 TP347H Niobium Stabilized Stainless Steel Seamless Pipe SCH80 for High Temperature Power Plant Applications
ASTM A312 TP347H is the high carbon niobium stabilized grade, with a carbon range of 0.04% to 0.10%. It offers higher creep and stress rupture strength than standard TP347, making it ideal for the most demanding elevated temperature service.
Supplied solution annealed with a controlled coarse grain size, TP347H pipe is a proven material for superheater and reheater tubing and high temperature steam piping in power generation plants.
| Element | ASTM A312 TP347H (%) |
|---|---|
| Carbon (C) | 0.04 - 0.10 |
| Silicon (Si) | 0.75 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 17.0 - 19.0 |
| Nickel (Ni) | 9.0 - 13.0 |
| Niobium + Tantalum (Nb+Ta) | 8 x C min, 1.10 max |
| Property | Unit | Value |
|---|---|---|
| Tensile Strength, min. | MPa (ksi) | 515 (75) |
| Yield Strength (0.2% offset), min. | MPa (ksi) | 205 (30) |
| Elongation in 2 in. or 50 mm, min. | % | 35 |
| Hardness, max. | HRB | 90 |
- Power plant superheater and reheater tubing
- High temperature steam piping and headers
- Refinery and petrochemical high temperature service
- Furnace, radiant tube and heat treatment equipment
- Chemical plant high temperature reactors and piping
- Industrial boilers and heat recovery systems
For ASTM A312 TP347H stainless steel pipe, please send us your required size (OD x WT), schedule, surface finish and quantity. Our team replies within 24 hours with a competitive quotation and full mill test certificates.
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