321 Aircraft Stainless Steel Tubing
Surface Finish：Custom
Type:Seamless/Welded Pipe
Wall Thickness:Custom
Thickness:8mm - 50mm or Customized
Surface Finish:2b, Pickled, Bright Annealed, Polished,Brushed, Ep
Inspection:TUV, SGS, BV, ABS, Lr and So on
Delivery Time:7-40 Days
What is 321 Aircraft Stainless Steel Tubing?
321 aircraft stainless steel tubing is a high-precision aerospace-grade tube made from Type 321 stainless steel (an American grade containing approximately 18% chromium, 10–12% nickel, and titanium as a stabilizing element; equivalent to China's 06Cr18Ni11Ti). Manufactured through cold rolling or cold drawing processes, these tubes offer tight dimensional tolerances (within ±0.05 mm) and a smooth internal surface finish (Ra ≤ 0.8 μm).
With excellent intergranular corrosion resistance and a wide operating temperature range from -196°C to 700°C, 321 stainless steel tubes are certified to aerospace standards such as AMS 5557, AMS 5570, and MIL-T-8808 and undergo rigorous testing, including eddy current testing and hydrostatic pressure testing at ≥20 MPa.
321 aircraft tubing
What makes 321 better than 304 in aircraft tubing?
321 exhaust tubing for aerospace applications contains titanium, which forms titanium carbides instead of chromium carbides. This prevents chromium carbide precipitation at grain boundaries during welding or high-temperature exposure-solving the issue of intergranular corrosion common in 304 stainless steel.
What is the applications of SS 321 aerospace pipe?
Aircraft exhaust systems
Jet engine components
Heat exchangers & manifolds
Hydraulic return lines
High-temperature ducting systems
Aerospace structural tubing
321 Aerospace structural tubing Specification
Grade: AISI 321 / UNS S32100
Type: Titanium-stabilized austenitic stainless steel
Standard equivalents: AMS 5557, AMS 5570, ASTM A269, MIL-T-8808, AMS 5510
Dimensional Specifications
| Parameter | Typical Range |
|---|---|
| Outer Diameter (OD) | 1/8" to 2" (3.18 mm to 50.8 mm) |
| Wall Thickness (WT) | 0.020" to 0.120" (0.5 mm to 3.0 mm) |
| Length | Up to 6 meters (custom lengths available) |
| Tolerance (OD) | ±0.05 mm |
| Surface Finish (ID/OD) | ≤ Ra 0.8 µm |
| Processing | Cold drawn / cold rolled seamless or welded |
Mechanical Properties (Annealed Condition)
| Property | Value (Typical) |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation | ≥ 35% |
| Hardness | ≤ 90 HRB |
| Impact Toughness | ≥ 27 J at -196°C |
Temperature Performance
| Condition | Value |
|---|---|
| Operating Temperature | -196°C to +700°C |
| Oxidation Resistance | Excellent up to 870°C (short-term) |
| Thermal Expansion (20–100°C) | 16.6 µm/m·K |
Get a Competitive Quote Today!
Each pipe supplied by GNEE is AMS 5510 certified and has undergone 16 testing processes including eddy current testing and 20MPa hydraulic testing. The defect rate is almost zero, ensuring zero tolerance for flight safety.
Choosing GNEE means choosing aviation quality! Contact us now to enjoy exclusive customized services + free material testing reports!
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