321 Stainless Steel Pipe
Stellanox Steel supplies high-performance 321 Stainless Steel Pipes designed for extreme heat resistance, exceptional weldability, and long-term corrosion protection. As a titanium-stabilized austenitic stainless steel, 321 pipes are ideal for use in high-temperature and welded environments—particularly in petrochemical, aerospace, power generation, and thermal processing industries.
321 pipes are especially effective where prolonged exposure to high temperatures and oxidation is expected, making them a preferred alternative to 304 stainless steel in such applications.
What is 321 Stainless Steel Pipe?
321 Stainless Steel Pipe is an austenitic stainless steel alloy with a composition similar to 304 stainless steel but stabilized with titanium. The titanium forms stable carbides and prevents chromium depletion at grain boundaries, which improves resistance to intergranular corrosion—especially after welding or during long-term exposure to elevated temperatures (up to 870°C).
These pipes are widely used for exhaust manifolds, pressure vessels, heat exchangers, and welded components exposed to stress and thermal cycling.
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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 Pipe
- Titanium Stabilization: Prevents carbide precipitation during welding and stress-relief processes.
- High-Temperature Strength: Performs effectively at elevated temperatures up to 870°C.
- Resistance to Intergranular Corrosion: Maintains integrity after welding or long-term heat exposure.
- Superior Oxidation Resistance: Protects against scaling in high-heat industrial settings.
- Excellent Weldability: Suitable for use in pressure vessels and heat-affected zones.
- Non-Magnetic in Annealed Condition: Ideal for sensitive instrumentation and aerospace use.
- Low Maintenance & Long Service Life: Reduces repair costs in harsh conditions.
Specification Chart – 321 Stainless Steel Pipe
| Property | Details |
|---|---|
| Grade | 321 (UNS S32100) |
| Standard | ASTM A312 / ASME SA312 |
| Size Range | 1/8" NB to 24" NB (DN6 to DN600) |
| Wall Thickness | SCH 5 to SCH 160 / XXS |
| Length | 6m, 12m, or custom lengths |
| Types Available | Seamless, Welded, ERW, EFW |
| End Finishes | Plain End (PE), Beveled End (BE), Threaded End |
| Surface Finishes | Annealed, Pickled, Polished |
| Certifications | EN 10204 3.1 / 3.2, NACE, ISO, IBR, PED |
Chemical Composition – 321 Stainless Steel Pipe
| Element | Symbol | Composition (%) |
|---|---|---|
| Chromium | Cr | 17.0 – 19.0 |
| Nickel | Ni | 9.0 – 12.0 |
| Carbon | C | ≤ 0.08 |
| Manganese | Mn | ≤ 2.0 |
| Silicon | Si | ≤ 0.75 |
| Phosphorus | P | ≤ 0.045 |
| Sulfur | S | ≤ 0.030 |
| Titanium | Ti | ≥ 5x(C + N) to 0.70 |
| Iron | Fe | 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) |
|---|---|---|---|
| 21.3 | 2.77 | 1.26 | 7.56 |
| 33.4 | 3.38 | 2.61 | 15.66 |
| 42.2 | 3.56 | 3.64 | 21.84 |
| 48.3 | 3.68 | 4.46 | 26.76 |
| 60.3 | 3.91 | 6.17 | 37.02 |
| 73.0 | 5.16 | 10.14 | 60.84 |
| 88.9 | 5.49 | 13.10 | 78.60 |
| 114.3 | 6.02 | 20.40 | 122.40 |
Applications of 321 Stainless Steel Pipe
- High-temperature steam piping
- Heat exchangers and thermal oxidizers
- Exhaust manifolds in aerospace and automotive industries
- Expansion joints and furnace components
- Oil & gas refinery piping systems
- Power generation boiler and superheater tubing
- Chemical processing pipelines
Benefits of 321 Stainless Steel Pipe
- Maintains strength and corrosion resistance in elevated temperatures
- No post-weld heat treatment required
- Excellent fatigue and creep resistance
- Non-magnetic and stable for instrumentation uses
- Long lifecycle with minimal maintenance
- Fully recyclable and sustainable for industrial applications
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