Product Overview – ASTM A312 TP309 Welded Pipes
ASTM A312 TP309 is an austenitic stainless steel grade containing higher chromium and nickel compared to 304. This composition significantly improves oxidation resistance at elevated temperatures.
TP309 welded pipes are manufactured by rolling stainless steel strip and longitudinally welding using TIG or automated welding processes. These pipes are primarily used in furnace and thermal processing systems where continuous exposure to high temperatures occurs.
Unlike 304 or 316 grades, SS 309 is specifically engineered for heat resistance rather than general corrosion resistance.
Standard & International Identification - ASTM A312 TP309 Welded Pipes
ASTM A312 TP309 Welded Pipe Specifications
| Manufacturing Type : | Welded / ERW |
| Available Sizes: | 1/8″ NB to 36″ NB |
| Schedules: | 5S, 10S, 40S, 80S |
| Length: | 6m, 12m, Custom Length |
| Finish: | Annealed & Pickled |
| End Type: | Plain End (PE), Beveled End (BE) |
| Testing : | Hydrostatic, Weld Seam Testing, PMI |
| Certification : | EN 10204 3.1 / 3.2 MTC |
| Dimensional compliance: | ASME B36.19M. |
All specifications are in accordance of ASTM A312 / ASME SA312 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition of ASTM A312 TP309 Welded Pipe
(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 (Fe) | Balance |
Note: The higher chromium content enhances oxidation resistance.
Mechanical Properties of TP309 Welded Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | 40% |
SS 309 maintains structural stability at elevated temperatures.
High Temperature Performance & Advantages of TP309 Welded Pipes
SS 309 welded pipes provide:
For furnace and burner systems, TP309 is often specified.
Applications of ASTM A312 TP309 Welded Pipes
- 🔸Industrial furnaces
- 🔸Kilns and heat treatment equipment
- 🔸Burner components
- 🔸High temperature ducting
- 🔸Boiler baffles
- 🔸Thermal processing plants
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