ASTM A213/ ASME SA213 TP321 (1.4541) Seamless Stainless steel Tube
Titanium-Stabilized Stainless Steel Tubes for High-Temperature Applications
ASTM A213 / ASME SA213 TP321 seamless stainless steel tubes, equivalent to EN 1.4541, are titanium-stabilized austenitic stainless steel tubes engineered for high-temperature, high-pressure, and corrosive environments. The addition of titanium prevents chromium carbide precipitation, ensuring excellent resistance to intergranular corrosion during welding or prolonged exposure to elevated temperatures.
TP321 seamless tubes are widely used in boilers, superheaters, heat exchangers, pressure vessels, and refinery piping systems.
ASTM A213 / ASME SA213 Standard Overview
ASTM A213 (ASME designation SA213) is the standard specification for seamless ferritic and austenitic alloy-steel tubes used in:
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Boilers
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Superheaters
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Heat exchangers
It defines requirements for chemical composition, mechanical properties, heat treatment, dimensional tolerances, and testing and is fully compatible with ASME Boiler & Pressure Vessel Code (BPVC) applications.
Download ASTM A213 Standard in PDF
Material Grade: TP321 / EN 1.4541
TP321 is a stabilized version of Type 304 stainless steel. Titanium binds with carbon to prevent carbide precipitation, improving performance at temperatures above 425°C.
Key Properties of TP321 Seamless Tubes
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Excellent resistance to intergranular corrosion
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Good oxidation resistance at elevated temperatures
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Improved thermal stability compared to TP304 / TP304L
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Good creep strength for continuous high-temperature service
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Excellent weldability without post-weld heat treatment
ASTM A213 TP321 Tube Size Range
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Outside Diameter: 6.35 mm – 114.3 mm (1/4″ – 4-1/2″)
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Wall Thickness: 0.5 mm – 12.7 mm
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Length: Random or fixed length
ASTM A213 TP321 Chemical Composition – TP321 (Typical, wt %)
| Element | % |
|---|---|
| Carbon | ≤ 0.08 |
| Chromium | 17 – 19 |
| Nickel | 9 – 12 |
| Manganese | ≤ 2.0 |
| Silicon | ≤ 1.0 |
| Titanium | ≥ 5 × C |
The addition of titanium stabilizes the microstructure and prevents chromium depletion at grain boundaries.
Mechanical Properties (Room Temperature)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
These mechanical properties provide reliable performance in high-temperature and high-pressure operating conditions.
ASTM A213 TP321 Heat Treatment
TP321 seamless tubes are supplied in the solution-annealed condition, ensuring a stable austenitic structure and optimal corrosion resistance for high-temperature service.
ASTM A213 TP321 Testing & Inspection
ASTM A213 / ASME SA213 TP321 tubes are supplied with full quality control, including:
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Chemical analysis
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Tensile testing
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Flattening and flaring tests
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Eddy current or hydrostatic testing
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Dimensional and visual inspection
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Certification: EN 10204 3.1 / ASME MTR
Applications of TP321 Seamless Stainless Steel Tubes
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Boilers and superheaters
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Heat exchangers and condensers
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Power generation plants
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Oil refineries and petrochemical units
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High-temperature steam and process piping
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Pressure vessels and thermal equipment
TP321 vs TP321H vs TP347 Tubes
| Grade | Stabilizer | High-Temp Strength | Typical Use |
|---|---|---|---|
| TP321 | Ti | Good | General high-temp service |
| TP321H | Ti (high C) | Better | Continuous high-temp service |
| TP347 | Nb | Excellent | Severe high-temp service |
Equivalent Material Grades
| Standard | Grade |
|---|---|
| ASTM / ASME | TP321 |
| UNS | S32100 |
| EN | 1.4541 |
| DIN | X6CrNiTi18-10 |
| JIS | SUS321 |
These international equivalents ensure compatibility with global engineering standards.
ASTM A213 / ASME SA213 TP321 (EN 1.4541) seamless stainless steel tubes offer excellent resistance to intergranular corrosion, stable mechanical properties, and reliable performance in high-temperature boiler and heat-exchanger applications. Fully compliant with ASTM and ASME standards, TP321 seamless tubes are a trusted solution for power plants, refineries, and critical pressure systems.
ASTM-A213-ASME-SA213-TP321-1.4541-Seamless-Tube
ASTM A213-ASME SA213 TP321-1.4541-Seamless-Stainless steel Tube
Related Stainless Steel Tube Grades
Other stainless steel tube grades commonly used in similar applications include:
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ASTM A213 TP304 / TP304L Tubes
- ASTM A312 TP321 Seamless Pipe
- ASTM A312 TP321H Seamless Pipe
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ASTM A213 TP310S Tubes
