ASTM A213 TP321 Stainless Steel Tube (UNS S32100)
ASTM A213 TP321 (UNS S32100) Stainless Steel Tube are titanium-stabilized austenitic stainless steel tubes designed for high-temperature service and superior resistance to intergranular corrosion. Unlike standard 304/316 grades, TP321 contains titanium, which stabilizes the structure and prevents carbide precipitation during welding and prolonged exposure to elevated temperatures. This makes TP321 highly suitable for heat exchangers, superheaters, and boiler tubes that operate in continuous high-temperature environments.
The grade exhibits exceptional resistance to oxidation, scaling, and thermal fatigue, making it ideal for high-temperature steam systems and refinery heater tubes. TP321 is also well-known for its excellent performance in environments where repeated thermal cycling and corrosive media are present. Its strong mechanical properties, excellent weldability, and dimensional stability make it one of the preferred materials for critical fabrication and engineering applications across multiple industries.
Key Features
- Titanium-stabilized grade for improved high-temperature strength
- Outstanding resistance to intergranular corrosion after welding
- Excellent oxidation & scaling resistance up to 900°C
- Strong mechanical properties and thermal stability
- Superior weldability and formability
- Excellent performance in cyclic temperature environments
- Long-lasting corrosion resistance in steam & acidic media
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S32100 |
| WNR | 1.4541 |
| EN | X6CrNiTi18-10 |
| JIS | SUS 321 |
| BS | 321S31 |
Available Sizes
-
Outer Diameter: 6 mm to 101.6 mm
-
Wall Thickness: 0.5 mm to 12.7 mm
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Length: Up to 12 meters
(Custom boiler & heat exchanger tubes available as per requirement)
ASTM A213 TP321 Chemical Composition
| Element | % |
|---|---|
| C | 0.08 max |
| Mn | 2.00 max |
| Si | 1.00 max |
| P | 0.045 max |
| S | 0.030 max |
| Cr | 17.0–19.0 |
| Ni | 9.0–12.0 |
| Ti | 5 × C min (0.20 max) |
| N | 0.10 max |
| Fe | Balance |
ASTM A213 TP321 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 35% min |
| Hardness | 90 HRB max |
| Temperature Resistance | Excellent up to 900°C |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1390–1440°C |
| Thermal Conductivity | 16.3 W/m·K |
| Modulus of Elasticity | 193 GPa |
Type of ASTM A213 TP321 Tube
- TP321 Seamless Heat Exchanger Tubes
- TP321 Boiler & Superheater Tubes
- TP321 High-Temperature Tubing
- TP321 Condenser Tubes
- TP321 Instrumentation Tubes
Application
- High-Temperature Boilers & Superheaters
- Petrochemical & Refinery Heaters
- Heat Exchangers & Condensers
- Power Generation Steam Systems
- Chemical Processing Plants
- Aerospace Exhaust & Thermal Systems
- Furnace & Heater Tubing
- Automotive & Industrial Exhaust Systems
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