Product Overview – ASTM A213 TP309 Seamless Tubes
ASTM A213 TP309 is a heat-resistant stainless steel grade containing higher chromium and nickel compared to 304 series grades. This composition significantly improves oxidation resistance and scaling resistance at elevated temperatures.
These seamless tubes are manufactured through hot finished or cold drawn processes, ensuring uniform wall thickness and structural integrity required for high-temperature environments.
TP309 seamless tubes are commonly used in furnace components, radiant tubes, combustion chambers, and thermal processing equipment.
Compared to TP304H, TP309 provides superior oxidation resistance at higher service temperatures.
Standard & International Identification - ASTM A213 TP309 Seamless Tubes
Technical Specifications – TP309 Seamless Tubes
| Tube Type: | Seamless / Cold Drawn / Hot Finished |
| Outer Diameter Range: | 6 mm to 273 mm |
| Wall Thickness: | 1 mm to 25 mm |
| Length: | Random / Cut Length / U-Bend Tubes |
| Surface Finish: | Bright Annealed / Pickled & Annealed |
| Testing: | Plain End (PE), Beveled End (BE) |
| Testing: | Hydrostatic Test, Eddy Current Test, PMI |
| Certification : | EN 10204 3.1 / 3.2 MTC |
Suitable for Furnace & High Temperature Applications
All specifications are in accordance of ASTM A213 / ASME SA213 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition of ASTM A213 TP309 Seamless Tubes
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C) | 0.20% |
| Manganese (Mn) | 2.00 % |
| Silicon (Si) | 1.00% |
| Phosphorus (P) | 0.045 % |
| Sulfur (S) | 0.030 % |
| Chromium (Cr) | 22.0 – 24.0% |
| Nickel (Ni) | 12.0 – 15.0% |
| Iron : | Balance |
Note: Higher chromium enhances oxidation and scaling resistance.
Mechanical Properties – ASTM A213 TP309 Seamless Tubes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength | 205 MPa |
| Elongation | 40% |
TP309 maintains mechanical stability under continuous elevated temperature service.
High Temperature & Oxidation Resistance Benefits- ASTM A213 TP309 Seamless Tubes
SS 309 seamless tubes offer:
For furnace and heat treatment systems, TP309 is widely preferred.
Major Industrial Applications of TP309 Seamless Tubes
- 🔸Boiler tubes
- 🔸Radiant and recuperator tubes
- 🔸Heat exchanger systems
- 🔸Thermal power plants
- 🔸Chemical processing units
- 🔸Oil & gas industry
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