ASTM A269 TP321H Stainless Steel Tubes (UNS S32109)
ASTM A269 TP321H (UNS S32109) Stainless Steel Tubes are high-carbon, titanium-stabilized austenitic stainless steel tubes designed for excellent performance in high-temperature environments. The “H” variant contains a higher carbon content, which provides enhanced high-temperature strength and improved creep resistance. TP321H stainless steel tubes are widely used in heat exchangers, superheaters, refineries, chemical processing, and thermal equipment where long-term exposure to elevated temperature is expected.
Key Features
- Enhanced High-Temperature Strength due to higher carbon content.
- Excellent Creep Resistance for long-term elevated temperature service.
- Superior Oxidation Resistance up to 870°C (1600°F).
- Titanium Stabilization minimizes carbide precipitation during welding.
- Outstanding Intergranular Corrosion Resistance after welding or heat exposure.
- Good Weldability & Fabricability for complex engineering designs.
- Ideal for High-Temperature, High-Stress Environments in refineries, power plants, and petrochemical units.
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S32109 |
| WNR | 1.4541 (Related) |
| EN | X6CrNiTi18-10 |
| BS | 321S51 |
| JIS | SUS 321H |
Available Sizes
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OD: 3.2 mm to 114.3 mm
-
Wall Thickness: 0.5 mm to 12 mm
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Length: Up to 12 meters
-
Custom Sizes available on special order
ASTM A269 TP321H Chemical Composition
| Element | % Composition |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| 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 |
| Nitrogen (N) | ≤ 0.10 |
| Titanium (Ti) | ≥ 5 × C min to 0.70 |
ASTM A269 TP321H 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 TP321H 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 TP321H Tubes
- Seamless Stainless Steel Tubes
- Welded Stainless Steel Tubes
- Bright Annealed (BA) Tubes
- Electro-Polished Tubes
- Heat Exchanger & Condenser Tubes
- Instrumentation Tubes
- Capillary Tubes
- Hydraulic Tubes
- U-Bent Tubes
Applications
- Oil & Gas Refining Units
- Petrochemical & Chemical Processing
- Power Plant Heat Exchangers
- Superheaters & Boiler Tubes (Non-pressure)
- Thermal Processing Equipment
- Furnace Components
- Exhaust Systems & High-Temperature Piping
- Pharmaceutical and Food Industry Fluid Transfer
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