ASTM A312 TP321 UNS S32100 1.4541 Seamless Stainless Steel Pipe For Power Generation
ASTM A312 TP321 seamless stainless steel pipe is a titanium-stabilized 18Cr-10Ni austenitic stainless steel pipe with UNS S32100 / EN 1.4541 / JIS SUS321 equivalents. It is supplied mainly in solution-annealed and pickled condition, with bright annealed or polished finishes available. The key advantages of TP321 stainless steel seamless pipes are good high-temperature strength, oxidation resistance, weldability, and resistance to intergranular corrosion after sensitizing exposure. TP321 grade is particularly known for its titanium stabilization, which improves resistance to intergranular corrosion after exposure to elevated temperatures and reduces the need for post-weld solution annealing in many applications. Typical sizes of this stainless steel pipes range from about 6-630 mm OD, wall thickness 0.5-50 mm, and lengths of 5-7 m random or 6 m fixed, with dimensional tolerances according to ASTM A312/A312M. It is widely used in chemical, petrochemical, power, heat-exchanger, furnace, aerospace, and high-temperature piping applications.
Chemical Composition, %:
| C |
Mn |
P |
S |
Si |
Cr |
Ni |
Ti |
| 0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
17.00–19.00 |
9.00–12.00 |
≥5×C, ≤0.70 |
Mechanical Properties:
| Tensile Strength, min |
515 MPa (75Ksi) |
| Yield Strength (0.2% offset), min |
205 MPa (30Ksi) |
| Elongation (50 mm gauge length), min |
35% |
| Hardness, max |
HBW 217 / HRB 95 |
Surface Finishes:
Pickled & Annealed (PA)
Solution annealing followed by acid pickling. Matte silver-grey surface, removes oxide scale. Most common finish for industrial piping. Good corrosion resistance.
Bright Annealed (BA)
Annealed under protective inert atmosphere, no pickling. Smooth, semi-bright metallic surface, thin passive film. No surface oxide, suitable for clean service.
Polished Surface
Mechanical polishing (e.g. 180#, 240#, 320#).
Main Features of ASTM A312 TP321 Seamless Pipes:
Excellent high-temperature strength
Good creep and rupture strength
Good ductility and weldability
Good formability and toughness
Good general corrosion resistance
Typical Applications:
High-temperature steam piping, boiler superheater tubes, reheater tubes
Oil and gas refining: furnace tubes, heater coils
Power generation: thermal power plant high-temperature process piping
Chemical and petrochemical industry: reactors, heat exchangers, high-temperature process pipelines
Aerospace exhaust components
Automotive exhaust manifolds
Food processing equipment under elevated temperature
Cryogenic and high-temperature pressure vessels piping
Waste incineration plant high-temperature flue gas piping
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