TP321 Stainless Steel Hexagonal Hollow Tube 321 Stainless Steel Hex Pipe S14 - S75mm
TP321 Stainless Steel Hexagonal Hollow Tube 321 Stainless Steel Hex Pipe S14 - S75mm
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Commodity
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304 316 321 Hollow Hexagonal Stainless Steel Pipe
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Grade
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Austenitic: 304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L, 904L
Duplex steel: S31803,S32205,S32750,S32760 |
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Standard
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ASTM A213, A312, ASTM A269,ASTM A778, ASTM A789, DIN 17456,DIN 17457,DIN 17459, JIS G3459, JIS G3463, GOS T9941,EN 10216, BS3605,
GB13296,etc. |
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Technique
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Hot Rolled / Cold Drawn
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Type
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Seamless pipe
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Size
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S14*6-8 - S80*55-70mm
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Length
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custom any length as request
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Packing
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In bundles, Nylon bags, wooden cases or as required
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Delivery Time
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Ready stocks 3-7 days, customized 7-10 days for customized size
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MOQ
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1 Ton
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Export To
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Singapore, Canada, Indonesia, Korea, USA, UK, Thailand,Saudi Arabia, Vietnam,India, Peru, Ukraine ,Brazil,South Africa, etc.
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321 Stainless Steel Hexagonal Pipe – Technical Overview
1. Introduction
321 stainless steel hexagonal pipe is a hollow hexagonal bar made from titanium-stabilized austenitic stainless steel (321). The addition of titanium (Ti) enhances its resistance to intergranular corrosion, particularly in high-temperature environments (up to 900°C). It is widely used in aerospace, chemical processing, heat exchangers, and exhaust systems due to its excellent thermal stability and oxidation resistance.
2. Specifications
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Shape & Dimensions:
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Hexagonal across flats (S): 6mm to 50mm
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Wall thickness (T): 0.5mm to 5mm
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Length: 1m to 6m (custom lengths available)
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Surface Finish: Smooth, polished, or matte finish options.
3. Standards Compliance
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International Standards:
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ASTM A312/A269 (Seamless & Welded Pipes)
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ASTM A554 (Welded Mechanical Tubing)
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EN 10296-2 (European Standard)
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Chinese Standards:
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GB/T 12770 (Welded Stainless Steel Pipes)
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GB/T 14976 (Seamless Stainless Steel Pipes)
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4. Chemical Composition (%)
| Element | C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr | Ni | Ti | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 321 | 0.08 | 0.75 | 2.00 | 0.045 | 0.03 | 17.0-19.0 | 9.0-12.0 | ≥5×C% | Balance |
Key Feature: Titanium (Ti) ≥ 5×C% prevents chromium carbide precipitation, improving high-temperature performance.
5. Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 321 | ≥520 | ≥205 | ≥40 | ≤187 |
Note: Retains strength at elevated temperatures (up to 900°C).
6. Manufacturing Process
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Material Preparation: 321 stainless steel billets (with Ti stabilization).
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Forming:
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Seamless Pipes: Hot extrusion or cold drawing.
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Welded Pipes: Rolled into hexagonal shape and TIG welded.
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Heat Treatment: Solution annealing (920–1150°C) followed by rapid cooling to dissolve carbides.
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Surface Treatment: Pickling, passivation, or polishing for corrosion resistance.
7. Key Features
✅ High-Temperature Resistance: Stable up to 900°C (avoids sensitization).
✅ Intergranular Corrosion Resistance: Titanium prevents chromium depletion.
✅ Oxidation Resistance: Forms a protective Cr₂O₃ layer in oxidizing atmospheres.
✅ Good Weldability: Suitable for welded structures.
8. Packaging
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Standard: Plastic end caps, bundled with steel straps, waterproof wrapping.
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Special: Wooden crates for heavy-duty protection.
9. Applications
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Aerospace: Jet engine components, exhaust systems.
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Chemical Industry: High-temperature pipelines, reactors.
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Heat Exchangers: Boilers, condensers.
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Automotive: Exhaust manifolds, catalytic converters.
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Architecture: Decorative structures requiring heat resistance.
Summary
321 stainless steel hexagonal pipe is ideal for high-temperature and corrosive environments, offering superior thermal stability and mechanical strength. Its titanium stabilization ensures long-term performance in critical applications.
Need customization or testing reports? Contact us for details!
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