What is ASTM A312 TP304H Stainless Steel Pipe?
ASTM A312 TP304H Stainless Steel Pipe is a high-carbon austenitic stainless steel pipe designed for elevated temperature service. It complies with ASTM A312 / ASME SA312 standards and is widely used in boilers, heat exchangers, superheaters, and pressure vessels.
The higher carbon content (0.04%–0.10%) improves high-temperature strength compared to 304 and 304L.
Also known as:
🔸 304H Stainless Steel Pipe
🔸 High Temperature 304H Pipe
🔸 ASTM A312 304H Seamless Pipe
ASTM A312 TP304H Pipe Specification
| Product Type : | Stainless Steel Pipe |
| Grade : | TP304H |
| Manufacturing Type : | Seamless & Welded |
| Certification : | EN 10204 3.1 / 3.2 MTC |
| Dimensional Standards | ASME B36.19M / B36.10M |
| Nominal Pipe Size (NPS) | 1/8″ to 30″ |
| Length | 6m, 12m, Custom Cut |
| End Types | Plain End, Beveled End |
| Country Supply | India & Global Export |
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 Stainless Steel Pipe
| Element | Max (%) |
|---|---|
| Carbon (C) | 0.04 - 0.10 |
| Manganese (Mn) | 2.00 |
| Phosphorus (P) | 0.045 |
| Sulfur (S) | 0.030 |
| Silicon (Si) | 1.00 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Iron (Fe) | Balance |
The higher carbon content differentiates 304H from 304 and 304L.
Mechanical Properties of 304H Stainless Steel Pipe
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| High Temperature Strength | Improved compared to 304L |
304H offers superior creep resistance at high temperatures.
Available Sizes & Dimensions
ASTM A312 TP304H stainless steel pipes are available in:
- 🔸Seamless 304H pipe
- 🔸Welded 304H pipe
- 🔸Schedule 40 304H pipe
- 🔸Schedule 80 304H pipe
- 🔸Heavy wall 304H pipe
Sizes range from 1/8″ NB to 30″ NB as per ASME B36.19M.
Custom cutting, polishing and finishing available.
Applications of ASTM A312 TP304H Pipes
- 🔸Power generation plants
- 🔸Superheaters and reheaters
- 🔸Heat exchangers
- 🔸Oil & gas refineries
- 🔸Chemical processing plants
- 🔸Boiler tubes
Best suited for high temperature piping systems.
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