Product Overview – ASTM A312 TP304H Welded Pipes
ASTM A312 TP304H is the high carbon version of 304 stainless steel. The controlled higher carbon range enhances high-temperature tensile strength and creep resistance.
TP304H welded pipes are manufactured by rolling stainless steel strip and longitudinally welding using advanced TIG or automatic welding processes. These pipes are commonly specified for boilers, superheaters, and refinery piping systems where elevated temperature performance is required.
Unlike 304L, this grade is not selected for corrosion-sensitive welding applications — it is selected for strength under heat.
Standard & International Identification - ASTM A312 TP304H Welded Pipes
ASTM A312 TP304H 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 TP304H Welded Pipe
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10% |
| Manganese (Mn) | 2.00 % |
| Silicon (Si) | 1.00 % |
| Phosphorus (P) | 0.045 % |
| Sulfur (S) | 0.030 % |
| Chromium (Cr) | 18.0 – 20.0% |
| Nickel (Ni) | 8.0 – 11.0% |
| Iron (Fe) | Balance |
Note: The increased carbon level improves high-temperature performance.
Mechanical Properties of TP304H Welded Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
304H provides improved creep strength compared to 304 and 304L.
High Temperature Performance & Advantages ASTM A312 TP304H Welded Pipes
SS 304H welded pipes offer:
For elevated temperature service, 304H is preferred over standard 304.
Applications of ASTM A312 TP304H Welded Pipes
- 🔸Boiler systems
- 🔸Superheaters and reheaters
- 🔸Heat exchangers
- 🔸Oil & gas refinery piping
- 🔸Power plant process lines
- 🔸Pressure vessel fabrication
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