321 Stainless Steel Tube
Stellanox Steel is a trusted supplier of 321 Stainless Steel Tubes, specially designed to perform in high-temperature environments while maintaining superior resistance to oxidation and intergranular corrosion. Stabilized with titanium, 321 tubes are ideal for use in heat exchangers, thermal oxidizers, exhaust manifolds, and high-temperature piping systems.
321 stainless steel is a variation of 304 with the addition of titanium (Ti), which improves resistance to carbide precipitation during welding and prolonged exposure to elevated temperatures.
What is 321 Stainless Steel Tube?
321 Stainless Steel Tubes are titanium-stabilized austenitic stainless steel products that resist sensitization — a form of corrosion that occurs in welded or heat-treated stainless steel. This makes them ideal for applications involving repeated heating within the range of 427–870°C.
321 tubes are commonly used in high-temperature aerospace and industrial applications, where thermal cycling and stress corrosion are major concerns.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 321 Stainless Steel Tube
- Titanium Stabilized Structure: Prevents carbide formation at high temperatures.
- Superior High-Temperature Strength: Withstands continuous use up to 870°C.
- Weld-Ready: Excellent weldability without post-weld annealing.
- Good Creep Resistance: Maintains dimensional stability under load at elevated temperatures.
- Excellent Oxidation Resistance: Performs well in oxidizing atmospheres.
- Non-Magnetic in Annealed State: Preferred in instrumentation and exhaust applications.
Specification Chart – 321 Stainless Steel Tube
| Property | Details |
|---|---|
| Grade | 321 (UNS S32100) |
| Standards | ASTM A213, A312, A269, A249, EN 10216-5 |
| Size Range (OD) | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 12 mm |
| Tube Types | Seamless, Welded, Cold Drawn, U-Bend |
| Surface Finishes | 2B, Bright Annealed, Polished, Pickled |
| End Types | Plain End (PE), Beveled End (BE), Threaded |
| Certifications | EN 10204 3.1 / 3.2, NACE, ISO, PED |
Chemical Composition – 321 Stainless Steel Pipe
| Element | Composition (%) |
|---|---|
| Chromium | 17.0 – 19.0 |
| Nickel | 9.0 – 12.0 |
| Carbon | ≤ 0.08 |
| Manganese | ≤ 2.0 |
| Silicon | ≤ 0.75 |
| Phosphorus | ≤ 0.045 |
| Sulfur | ≤ 0.030 |
| Titanium | 5x (C%) min to 0.70 |
| Iron | Balance |
Mechanical Properties – 321 Stainless Steel Pipe
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 95 |
| Modulus of Elasticity | 193 GPa |
| Density | 7.90 g/cm³ |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 321 |
| EN | 1.4541 |
| JIS | SUS 321 |
| UNS | S32100 |
| DIN | X6CrNiTi18-10 |
321 Stainless Steel Pipe Weight Chart
| OD (mm) | Wall Thickness (mm) | Weight per Meter (kg) | Weight per 6m (kg) |
|---|---|---|---|
| 12.7 | 1.2 | 0.28 | 1.68 |
| 19.05 | 1.5 | 0.50 | 3.00 |
| 25.4 | 2.0 | 0.95 | 5.70 |
| 38.1 | 2.5 | 1.71 | 10.26 |
| 50.8 | 3.0 | 2.78 | 16.68 |
| 63.5 | 3.0 | 3.53 | 21.18 |
| 76.2 | 3.5 | 4.92 | 29.52 |
Applications of 321 Stainless Steel Tube
- Aircraft exhaust manifolds and engine parts
- Heat exchangers and furnace tubes
- Chemical processing piping
- Expansion joints and bellows
- Oil and gas tubing
- High-temperature industrial ducting
- Food-grade systems exposed to steam or heat
Benefits of 321 Stainless Steel Tube
- Titanium-stabilized for welding and long-term heat exposure
- Reduces intergranular corrosion during and after welding
- Maintains strength and form at elevated temperatures
- Withstands thermal shock and cyclic heating
- Ideal for pressure-containing applications at high heat
- Smooth finish for sanitary and aesthetic applications
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