304H Stainless Steel
304H is a high-carbon variant of the popular 304 austenitic stainless steel. Its key composition includes 18-20% chromium, 8-10.5% nickel, and a carbon content of 0.04-0.10%—higher than standard 304’s maximum 0.08%.
This elevated carbon content enhances its high-temperature strength and creep resistance, making it ideal for sustained use in elevated thermal environments. It maintains structural stability at temperatures up to 870°C (1600°F), outperforming regular 304 in such conditions.
Chemical Composition
|
C |
Si |
Mn |
P |
S |
Cr |
Ni |
|
|
Min |
0.04 |
- |
- |
- |
- |
18 |
8 |
|
Max |
0.1 |
1 |
2 |
0.045 |
0.03 |
20 |
11 |
Material Properties
|
Density |
Melting Point |
Minimum Mechanical Properties at Room Temperature |
||
|
Tensile Strength |
Yield Strength |
Elongation |
||
|
g/cm3 |
℃ |
Rm N/mm2 |
Rp0.2 N/mm2 |
A5% |
|
8 |
1400~1450 |
515 |
205 |
40% |
Feature
304H is the high-carbon variant (0.04%~0.10% C) of 304 stainless steel, specifically engineered for high-temperature applications. The elevated carbon content enhances its high-temperature strength and creep resistance, making it suitable for service above 525°C (up to 800°C maximum).
While solution-annealed 304H exhibits corrosion resistance and workability comparable to standard 304, prolonged exposure to the sensitization temperature range (425~860°C) may lead to intergranular corrosion.
Applications
Applicable to heat-resistant scenarios above 500°C.
High-Temperature Equipment: Pressure-bearing components such as boilers, heat exchangers, and superheater pipes.
Energy Industry: High-temperature pipelines and structural parts for power plants and petrochemical installations.
Machining & Manufacturing: Fasteners and transmission components requiring higher strength.
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