321 Stainless Steel Tube – Titanium-Stabilised High-Temperature Champion for 870 °C Welded Tubing
When your tubing system must survive continuous exposure between 425 °C and 850 °C, only 321 Stainless Steel Tube eliminates the risk of sensitisation and intergranular corrosion. The deliberate addition of titanium (≥5×C) locks up carbon as harmless TiC, preventing chromium depletion along grain boundaries during welding or long-term thermal cycling. This unique mechanism delivers full corrosion resistance after welding, excellent creep strength to 870 °C, and complete compatibility with standard welding procedures—making 321 stainless steel tube the undisputed standard for aircraft exhaust tubing, furnace coils, thermal oxidizers, and high-temperature sanitary lines worldwide.
Caption: 321 Stainless Steel Coil Tube – Up to 3000 m Continuous, Perfect for Furnace & Heat Exchanger CoilsKey Features & Benefits
- Titanium stabilised (Ti ≥ 5×C) – immunity to sensitisation 425–850 °C
- Continuous service to 870 °C; intermittent to 900 °C with minimal scaling
- Excellent creep & stress-rupture strength above 600 °C
- Superior weldability – no post-weld stabilising heat treatment required for most services
- Fully austenitic – non-magnetic, even after severe cold work
- Available in seamless, welded, coil, and sanitary variants – full 321 stainless steel tube manufacturers range
- Full compliance – ASTM A213, A269, A312, A249, EN 10216-5, AMS 5570, PED 2014/68/EU
Technical Specifications
Table 1 – Chemical Composition (ASTM A213)
| Element | 321 % | 321H % | 304 % | 347 % |
|---|---|---|---|---|
| Cr | 17.0–19.0 | 17.0–19.0 | 18.0–20.0 | 17.0–19.0 |
| Ni | 9.0–12.0 | 9.0–12.0 | 8.0–10.5 | 9.0–13.0 |
| Ti | ≥5×C | ≥4×C | 0 | 0 |
| Nb | 0 | 0 | 0 | 10×C |
| C (321) | ≤0.08 | 0.04–0.10 | ≤0.08 | ≤0.08 |
| Fe | Balance | Balance | Balance | Balance |
Table 2 – Mechanical & Elevated-Temperature Properties
| Property | Room Temp. | 650 °C | 870 °C |
|---|---|---|---|
| Tensile Strength | ≥515 MPa | ≥320 MPa | ≥150 MPa |
| Yield Strength (0.2 %) | ≥205 MPa | ≥150 MPa | ≥85 MPa |
| Elongation in 2" | ≥40 % | ≥28 % | ≥30 % |
| Hardness HRB | ≤92 | — | — |
| Density | 8.0 g/cm³ (0.289 lb/in³) | — | — |
| Thermal Expansion | 17.2 µm/m·K (20–100 °C) | — | — |
Full Size Range Table
Round Tube
| OD (mm) | WT (mm) | Length (m) | Type | Standard |
|---|---|---|---|---|
| 6 | 0.8–2.0 | 6 or coil | Seamless | ASTM A269 |
| 25 | 1.5–4.0 | 6 or coil | Seamless | ASTM A312 |
| 89 | 2.8–8.0 | 6 or coil | Seamless | ASTM A312 |
| 219 | 3.0–20.0 | 6 or 12 | Welded | ASTM A358 |
321 Stainless Steel Coil Tube
| OD (mm) | WT (mm) | Length (m) | Coil ID | Standard |
|---|---|---|---|---|
| 6–25 | 0.8–3.0 | Up to 3000 | 508 mm | ASTM A269 |
| 25–50 | 1.5–4.0 | Up to 1000 | 610 mm | ASTM A249 |
321 Sanitary Seamless Stainless Steel Tube
| OD (mm) | WT (mm) | Ra (µm) | Standard | Certificate |
|---|---|---|---|---|
| 12.7–101.6 | 0.5–3.0 | ≤0.6 | ASTM A270 | 3A, FDA |
| 25.4–63.5 | 1.0–2.0 | ≤0.4 | EN 10217-7 | PED |
Custom oval, square, and rectangular sections available.
Product Range & Market Info
As one of the world’s largest 316 stainless steel tube manufacturers and most reliable 316 stainless steel tube supplier (with dedicated UK/Europe warehouse for 316 stainless steel tube uk customers), we operate a 120 000 t/year mill with five continuous mandrel mills and seven ERW lines dedicated to 316 stainless steel tube production. Our 200 000 m² facility keeps 50 000 t of ready 316 stainless steel tube for sale in Shanghai and Houston, ensuring immediate availability for global distributors. Whether you need one coil of 6 mm × 1 mm or a full vessel of 219 mm × 8 mm, our mill-direct pricing and ABS/DNV-approved quality give you the competitive edge. Contact our export team today for the most updated quotation and downloadable 3.1 MTC.
Specialty products include complete 316 stainless steel coil tube – up to 3000 m continuous length, bright annealed, manufactured under ASTM A269.
Caption: 321 Sanitary Seamless Stainless Steel Tube – Ra≤0.6 µm, Aviation & High-Temp Hygienic ApprovedMain Applications
- Aircraft exhaust tubing – collector rings, turbo-charger ducts
- Furnace coils – radiant tubes, muffles, baskets
- Thermal oxidizer tubing – flare stacks, reactor liners
- High-temperature heat exchangers – shell-and-tube, plate-frame
- Refinery flare lines – welded joints, expansion loops
- Superheater tubes – power station boilers
- Expansion loops – high-temp chemical process at 500–900 °C
- 321 stainless steel coil tube – up to 3000 m continuous length
- 321 sanitary seamless stainless steel tube – high-temp dairy/pharma lines
Caption: Global Supply from Top 321 Stainless Steel Tube Manufacturers – High-Temperature Grade for Aerospace & Industrial ApplicationsWhy Choose Us – Marine & High-Temp Specialist
- ASME/PED/TUV certified mill – EN 10204 3.1 & 3.2 MTC supplied
- ABS/DNV aviation approvals – accepted by Boeing & Airbus Tier-1 suppliers
- 120 000 tons annual capacity – 5-day lead time for standard sizes
- UK local stock + same-day dispatch – 316 stainless steel tube uk warehouse
- Bright annealing + 100 % PMI & eddy current testing – defect-free mirror finish
- Real-time stock portal – 24/7 visibility for any 316 stainless steel tube supplier
Grade Comparison Table: 321 vs 304 vs 316 vs 310S vs 347 vs 321H
| Grade/Type | Ti % | Mo % | Max Temp (°C) | Weld Post-Treat | Relative Cost | Best Use |
|---|---|---|---|---|---|---|
| 321/321H | ≥5×C | 0 | 870 | Not needed | 1.1× | High-temp welded |
| 304 | 0 | 0 | 800 | Not needed | 1.0× (base) | General service |
| 316 | 0 | 2–3 | 870 | Not needed | 1.35× | Marine chloride |
| 310S | 0 | 0 | 1150 | Not needed | 1.4× | Furnace radiant |
| 347 | Nb≥10×C | 0 | 870 | Not needed | 1.2× | Nuclear welded |
FAQ – 321 Stainless Steel Tube
-
Price vs 304/316?
Mill-direct FOB China USD 2.60–3.00/kg depending on nickel surcharge; fixed for 48 h. -
Maximum service temperature?
870 °C continuous; intermittent to 900 °C with acceptable scaling. -
Coil tube length limits?
321 stainless steel coil tube up to 3000 m continuous, 6–50 mm OD. -
Sanitary certification?
321 sanitary seamless stainless steel tube meets 3A, FDA, Ra ≤0.6 μm. -
UK delivery time?
Same-day dispatch from 316 stainless steel tube supplier warehouse; 24–48 h to mainland UK. -
Minimum order quantity?
One coil or bundle for stock sizes; full container (≈25 t) for mill-direct. -
Which certificates accompany the shipment?
EN 10204 3.1/3.2 MTC, ABS/DNV, FDA, and third-party inspection (SGS/TÜV/BV). -
Do you export worldwide?
Yes, to 80+ countries including UK, Germany, Norway, UAE, USA, and Australia.
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