ASTM A312 TP321 Austenitic Stainless Steel Pipes (UNS S32100)
ASTM A312 TP321 (UNS S32100) is a titanium-stabilized austenitic stainless steel grade designed to resist intergranular corrosion, especially after welding and exposure to elevated temperatures. TP321 is particularly suitable for applications involving repeated heating up to 900°C. It provides excellent overall corrosion resistance, high mechanical strength, and good weldability, making it ideal for chemical, refinery, and high-temperature service applications.
Key Features
- Titanium-stabilized to prevent carbide precipitation
- Excellent resistance to intergranular corrosion
- Superior high-temperature oxidation resistance
- Good mechanical strength and stability during thermal cycling
- Performs well in environments containing acids and chlorides
- Excellent weldability and fabrication properties
- Suitable for use between 425°C–900°C
- Available in seamless, welded, and EFW forms
Product Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP321 |
| UNS Number | UNS S32100 |
| Material | Titanium-Stabilized Austenitic Stainless Steel |
| Pipe Type | Seamless / Welded / EFW |
| Forms | Round / Square / Rectangular |
| Schedule | SCH 5S – SCH XXS |
| Size Range | 1/8” NB to 24” NB |
| End Finish | Plain End / Beveled End / Threaded |
| Surface Finish | Annealed / Pickled / Polished |
| Length | SRL / DRL / Custom Cut Lengths |
| Certification | EN 10204 3.1 / 3.2 |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP321 |
| UNS | S32100 |
| WNR | 1.4541 |
| EN | X6CrNiTi18-10 |
| JIS | SUS 321 |
| BS | 321S12 |
Available Sizes
- Outer Diameter (OD): 6 mm to 610 mm
- Wall Thickness: 1.2 mm to 60 mm
- Nominal Bore: 1/8” NB to 24” NB
- Lengths: SRL, DRL, Custom up to 12 meters
ASTM A312 TP321 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C (%) and ≤ 0.70% |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP321 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | 35% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP321 Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Range | 1398 – 1450°C |
| Thermal Conductivity | 16.3 W/m·K (100°C) |
| Electrical Resistivity | 0.73 µΩ·m |
| Coefficient of Expansion | 16.5 µm/m°C (20–100°C) |
Types of TP321 Stainless Steel Pipes
- Seamless Pipes
- Welded Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Heat Exchanger & Superheater Tubes
- Custom Fabricated Pipes
Applications
- High-temperature boiler & heater tubes
- Petrochemical and refinery piping
- Heat exchangers & superheaters
- Chemical processing plants
- Furnace and thermal processing equipment
- Pulp & paper industries
- Food and pharmaceutical processing lines
- Oil and gas pipelines
- Exhaust and high-temperature gas systems
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