ASTM A269 TP321 Stainless Steel Tubes (UNS S32100)
ASTM A269 TP321 (UNS S32100) Stainless Steel Tubes are stabilized austenitic stainless steel tubes designed for high-temperature service and exceptional resistance to intergranular corrosion. Alloyed with titanium, TP321 resists carbide precipitation during welding, making it suitable for continuous high-temperature exposure. These tubes demonstrate outstanding mechanical strength, thermal stability, and resistance to oxidation, making them ideal for chemical processing, refinery equipment, heat exchangers, and high-temperature piping systems.
Key Features
- Excellent High-Temperature Strength due to titanium stabilization.
- Superior Resistance to Intergranular Corrosion even after welding and exposure to high temperatures.
- High Oxidation Resistance up to 870°C (1600°F).
- Good Mechanical Strength & Toughness in both cryogenic and elevated temperatures.
- Improved Weldability without risk of carbide precipitation.
- Suitable for Aggressive Environments including petrochemical and thermal processing industries.
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S32100 |
| WNR | 1.4541 |
| BS | 321S31 |
| EN | X6CrNiTi18-10 |
| JIS | SUS 321 |
Available Sizes
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Outer Diameter (OD): 3.2 mm – 114.3 mm
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Wall Thickness: 0.5 mm – 10 mm
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Length: Up to 12 meters
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Custom Sizes available on request
ASTM A269 TP321 Chemical Composition – ASTM A269 TP321
| Element | % Composition |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C min, ≤ 0.70 |
| Nitrogen (N) | ≤ 0.10 |
ASTM A269 TP321 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (Rockwell B) | ≤ 92 HRB |
| Density | 8.0 g/cm³ |
ASTM A269 TP321 Physical Properties
| Property | Value |
|---|---|
| Melting Point | 1400 – 1425°C |
| Thermal Conductivity | 16.3 W/m-K (at 100°C) |
| Electrical Resistivity | 0.72 µΩ-m |
| Thermal Expansion | 16.6 × 10⁻⁶ /°C |
| Modulus of Elasticity | 193 GPa |
Types of ASTM A269 TP321 Stainless Steel Tubes
- Seamless Tubes
- Welded Tubes
- ERW Tubes
- Bright Annealed (BA) Tubes
- Electropolished Tubes
- Heat Exchanger Tubes
- Condenser Tubes
- Instrumentation Tubes
- Capillary Tubes
Applications
- Petrochemical & Refineries
- Heat Exchangers & Condensers
- High-Temperature Piping Systems
- Chemical Processing Equipment
- Food & Pharmaceutical Processing
- Thermal Oxidizers
- Power Generation
- Aerospace Exhaust Systems
- Oil & Gas Processing Units
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