ASTM A312 TP347 Niobium Stabilized Stainless Steel Seamless Pipe Annealed SCH40 for High Temperature Applications
ASTM A312 TP347 is a niobium (columbium) stabilized austenitic stainless steel seamless pipe. The niobium addition ties up the carbon as stable carbides, preventing chromium depletion at grain boundaries and giving the material excellent resistance to intergranular corrosion.
TP347 pipe is a robust choice for high temperature and severely corrosive service, and it is especially well suited to applications involving repeated thermal cycling and welded fabrication.
| Element | ASTM A312 TP347 (%) |
|---|---|
| Carbon (C) | 0.08 max |
| 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) | 10 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 |
- High temperature chemical and petrochemical service
- Boiler tubes and superheater tubing
- Aircraft and rocket engine exhaust systems
- Heavy duty heat exchangers and process piping
- Nuclear and power plant components
- Petroleum refining equipment and furnace parts
For ASTM A312 TP347 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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