304H stainless steel provides a solution when pipework is often exposed to high temperatures. Designed for demanding high-temperature service, it avoids costly creep deformation. Ensure reliable performance of your stainless steel pipe and stainless steel fittings.
What Is 304H Stainless Steel?
Stainless steel 304H (UNS S30409) is a high-carbon version of stainless steel 304. It is an austenitic chromium-nickel alloy. The high carbon content increases strength at high temperatures and enhances creep resistance. This makes 304H stainless steel ideal for applications above 500 degrees Celsius (932 degrees Fahrenheit).
Key Advantages of 304H Stainless Steel
Stainless Steel 304H retains its strength at very high temperatures and resists deformation under load.
Higher carbon content increases creep strength. It resists slow, permanent deformation over time.
The chromium content creates a protective oxide layer that prevents surface degradation. This ensures longevity in oxidising environments.
Despite its high carbon content, Stainless Steel 304H is easy to weld.
The 304H Steel is used in many industries. It is used in chemical processing, power generation and refining, and can handle corrosive media at high temperatures.
Chemical Composition
| Element | Cr | Ni | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|
| Content (%) | 18.0 – 20.0 | 8.0 – 10.5 | 0.04 – 0.10 | ≤2.00 | ≤0.75 | ≤0.045 | ≤0.030 |
What We Do
Typical Mechanical Properties
| Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness (HRB) | Density | Melting Range |
|---|---|---|---|---|---|
| ≥515MPa(75ksi) | ≥205MPa(30ksi) | ≥40 | ≤92 | 8.0g/cm³ | 1400−1450°C |
304H Stainless Steel in High-Temperature Piping Applications
- Pressure Vessels: Handling of high temperature and high pressure vessels including steam headers and heat exchangers.
- Boiler components: The 304H steel is used for superheater and reheater pipework. They can withstand high heat and steam pressures.
- Refinery Piping: Commonly found in petrochemical plants, it handles hot process fluids. This includes furnaces and crackers.
- Power Plants: Components exposed to flue gases or hot steam can be made of 304H Stainless Steel.
- Industrial Furnaces: Used in radiant tubes, mufflers and heat treatment units. Because it prevents scaling and oxidation at very high temperatures.
Sourcing 316H Stainless Steel Pipe and Fittings
Check for compliance with ASTM standards. ASTM A312 covers seamless and welded stainless steel pipe. ASTM A403 covers wrought austenitic stainless steel fittings.
Ensure that pipes and fittings meet the required dimensions. This includes specifications (e.g., Sch 10S, Sch 40S). Proper fit is critical.
View Stainless Steel Tube Specification Document
Work with reputable manufacturers who offer reliable 304H steel products and have certifications(e.g. ISO 9001 and CE-PED).
Always ask for Material Test Reports, which confirm chemical composition and verify mechanical properties.
304H is designed for high temperatures, but specific welding procedures are also important. Please ensure proper post-weld treatment.
Contact Us
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
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