Our ASTM A269 TP321 seamless stainless steel tubes (UNS S32100, EN 1.4541, AISI 321) are titanium-stabilized austenitic tubes engineered for general corrosion-resisting and high/low-temperature service. The titanium addition locks up carbon as stable titanium carbides, preventing chromium carbide precipitation and intergranular corrosion after welding. Supplied in solution-annealed (bright annealed or pickled) condition with full Mill Test Certificate (EN 10204 3.1).
Key Features
Titanium-stabilized austenitic grade - resists intergranular corrosion / sensitization after welding.
Excellent high-temperature strength and oxidation resistance up to ~870 °C (1600 °F).
Good toughness from cryogenic to elevated temperatures; high creep rupture strength.
Weldable by standard procedures without post-weld sensitization risk.
Seamless manufacture - no weld seam, superior pressure integrity and uniform quality.
Broad resistance to many aggressive media in chemical and process industries.
Specifications
|
Parameter |
Value |
|
Standard |
ASTM A269 / ASME SA269 |
|
Grade |
TP321 |
|
UNS No. |
S32100 |
|
Product Form |
Seamless Stainless Steel Tube |
|
Outer Diameter (OD) |
3.18 mm (1/8") – 323.9 mm (12"); larger sizes on request |
|
Wall Thickness |
0.5 mm – 12 mm (up to 60 mm on request) |
|
Length |
6 m standard, up to 12 m; cut-to-length / random lengths |
|
Schedules |
5S, 10S, 40S, 80S, 160, XXS |
|
Surface Finish |
Annealed & Pickled, Bright Annealed (BA), Polished (180/240/320/400 grit) |
|
Ends |
Plain End (PE), Beveled End (BE) |
|
Heat Treatment |
Solution Annealed ≥ 1040 °C, water quenched |
Chemical Composition
|
Element |
Composition |
|
Carbon (C) |
≤ 0.08 |
|
Manganese (Mn) |
≤ 2.00 |
|
Silicon (Si) |
≤ 1.00 |
|
Phosphorus (P) |
≤ 0.045 |
|
Sulfur (S) |
≤ 0.030 |
|
Chromium (Cr) |
17.0 – 19.0 |
|
Nickel (Ni) |
9.0 – 12.0 |
|
Titanium (Ti) |
≥ 5×(C+N), ≤ 0.70 |
|
Nitrogen (N) |
≤ 0.10 |
|
Iron (Fe) |
Balance |
Mechanical & Physical Properties
|
Property |
Value |
|
Tensile Strength |
≥ 515 MPa (75 ksi) |
|
Yield Strength (0.2% offset) |
≥ 205 MPa (30 ksi) |
|
Elongation (in 50 mm / 2 in.) |
≥ 35% |
|
Hardness |
≤ 95 HRB (≤ 217 HBW) |
|
Density |
8.0 g/cm³ (8027 kg/m³) |
|
Modulus of Elasticity |
193 GPa |
|
Melting Point |
1400 – 1450 °C (2550 – 2640 °F) |
|
Mean CTE (0–538 °C) |
16.6 – 18.6 ×10⁻⁶ /°C |
|
Thermal Conductivity (100 °C) |
16.1 – 16.3 W/m·K |
|
Solution Annealing |
≥ 1040 °C (≥ 1900 °F), water quenched |
Equivalent Grades
|
Standard |
Grade / Designation |
|
ASTM A / ASME SA |
TP321 |
|
UNS |
S32100 |
|
EN / DIN Werkstoff |
1.4541 (X6CrNiTi18-10) |
|
AISI |
321 |
|
BS |
321S31 |
|
JIS |
SUS 321 |
|
GB |
06Cr18Ni11Ti (S32168) |
|
Swedish SS |
2337 |
Manufacturing & Quality Assurance
Manufacturing: seamless tubes are produced by hot extrusion followed by cold drawing / cold rolling for tight tolerances and superior surface quality. All tubes are solution-annealed (≥1040 °C) and water quenched to ensure optimum corrosion resistance.
Testing & Certification:
Hydrostatic / pneumatic pressure test
Eddy current test (ET)
Positive Material Identification (PMI)
Flattening & flaring test
Intergranular corrosion (IGC) test - ASTM A262
Chemical & mechanical testing per heat
Mill Test Certificate per EN 10204 3.1 (3.2 / third-party inspection on request)
Applications
Petrochemical & refinery equipment
Oil & gas, including offshore platforms
Heat exchangers & condensers
Chemical processing plants
Power generation (incl. FGD / desulfurization systems)
Aerospace & high-temperature exhaust systems
Food & pharmaceutical processing
Pulp & paper industry
Desalination & seawater systems
High-temperature piping and furnace components
Packaging & Shipping
Tubes are bundled and protected with plastic end caps, wrapped in waterproof material, and packed in wooden cases or bundles. Shipped by sea (FCL/LCL), air, or land per Incoterms (FOB, CIF, EXW). Standard export packaging protects against moisture and transit damage.
Frequently Asked Questions
What is ASTM A269 TP321 seamless stainless steel tube?
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It is a titanium-stabilized austenitic stainless tube made to ASTM A269 for general corrosion-resisting and high/low-temperature service. "Seamless" means it is formed without a weld seam, giving higher pressure integrity.
Is TP321 the same as UNS S32100 and 1.4541?
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-
Yes. TP321 is the ASTM/ASME grade name; UNS S32100 is the unified numbering; 1.4541 (X6CrNiTi18-10) is the European EN/DIN equivalent; AISI 321 is the common name.
What temperature can A269 TP321 tube withstand?
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It offers excellent oxidation resistance up to ~870 °C (1600 °F) in continuous service and resists sensitization after welding, making it ideal for high-temperature and thermal-cycling duty.
Can ASTM A269 TP321 be welded?
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Yes. The titanium stabilization prevents chromium carbide precipitation during welding, so it can be welded by standard methods without post-weld sensitization (annealing after welding is generally not required).
What sizes are available?
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OD ranges from 3.18 mm (1/8") to 323.9 mm (12"), wall thickness 0.5–12 mm (up to 60 mm on request), lengths up to 12 m or cut-to-length. Custom sizes are available.
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