Product Overview – ASTM A269 TP309S Welded Tubes
ASTM A269 TP309S welded stainless steel tubes are designed for applications requiring excellent resistance to oxidation and corrosion in high-temperature environments.
The grade contains higher chromium and nickel content compared with 304 stainless steel, which significantly improves heat resistance and corrosion protection.
The “S” designation indicates low carbon content, which enhances weldability and reduces the risk of carbide precipitation during welding.
TP309S welded tubes are manufactured from high-quality stainless steel strips that undergo precision rolling, automatic welding, heat treatment, and pickling to ensure consistent mechanical properties and corrosion resistance.
Due to their excellent heat resistance, ASTM A269 TP309S tubes are widely used in furnace components, heat treatment equipment, refinery processing units, petrochemical plants, and high-temperature piping systems.
Standard & International Identification - ASTM A269 TP309S Welded Tubes
Technical Specifications – TP309S Welded Tubes
| Tube Type: | Welded Stainless Steel Tubes |
| Manufacturing Process: | Cold Rolled Strip → Automatic Welding → Heat Treatment → Pickling & Passivation |
| Outer Diameter: | 6 mm to 114 mm |
| Wall Thickness: | 0.5 mm to 6 mm |
| Length Options: | Random / Cut Length / Custom Fabricated Tubes |
| Surface Finish: | Bright Annealed / Pickled & Annealed / Polished Finish Available |
| Testing & Inspection: | Hydrostatic Test, Eddy Current Test,Flattening Test, PMI, Flaring Test |
| Certification : | EN 10204 3.1 / 3.2 MTC |
Third Party Inspection Available
All specifications are in accordance of ASTM A269 / ASME SA269 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – Stainless Steel TP309S Welded Tubes
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.08% |
| 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: The high chromium and nickel content provide superior oxidation resistance and high temperature performance.
Mechanical Properties – ASTM A269 TP309S Tubes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength | 205 MPa |
| Elongation | 35% |
These mechanical properties ensure durability and reliability in heat-resistant industrial applications.
High Temperature Resistance of SS 309S Tubes
SS 309S tubes are widely recognized for their ability to perform in extreme thermal environments.
Key performance advantages include:
Because of these characteristics, TP309S tubing is commonly used in high temperature industrial processing systems.
Major Industrial Applications of TP309S welded stainless steel tubes
- ASTM A269 TP309S welded stainless steel tubes are widely used in:
- 🔸Industrial Furnace Equipment
- 🔸Heat Treatment Plants
- 🔸Petrochemical Processing Units
- 🔸High Temperature Piping Systems
- 🔸Power Generation Plants
- 🔸Thermal Processing Industries
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