347H Stainless Steel
Stainless Steel 347H is a high-carbon, titanium-stabilized austenitic stainless steel variant of the standard 347 grade, specifically engineered to deliver enhanced high-temperature strength and creep resistance. This alloy retains the core corrosion resistance benefits of 347 while offering superior mechanical performance in prolonged elevated-temperature service, making it a critical material in high-heat industrial applications.
Chemical Composition
|
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Nb |
|
|
Min |
0.04 |
- |
- |
- |
- |
17 |
9 |
0.32 |
|
Max |
0.1 |
1 |
2 |
0.045 |
0.03 |
19 |
13 |
1.1 |
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% |
|
7.96 |
1400~1450 |
515 |
205 |
40% |
Feature
347H is a high-carbon modified version (0.04%~0.10% C) of 347 stainless steel, specifically optimized for high-temperature applications. By combining niobium stabilization (Nb≥8×C%) with controlled carbon content, it achieves both excellent resistance to intergranular corrosion and superior high-temperature strength. The niobium effectively binds carbon atoms, preventing intergranular corrosion during welding and high-temperature service (450~900℃).
Applications
Power Plant Systems: Boiler superheater tubes, cracking furnace tubes (long-term service above 800°C)
Petrochemical Core Equipment: Hydrogenation reactors, high-temperature/pressure pipelines
Aerospace Propulsion: Jet engine combustion chamber components
Nuclear Energy Applications: Fast neutron reactor high-temperature structural parts
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