321H Stainless Steel
321H is a high-carbon, titanium-stabilized austenitic stainless steel (UNS S32109), engineered for elevated temperature service. Its composition includes 17.0-19.0% Cr, 9.0-12.0% Ni, minimum 0.15% Ti, with carbon controlled at 0.04-0.10%—higher than standard 321.
The increased carbon enhances high-temperature creep strength and rupture resistance, critical for sustained operation at 650-900°C. Titanium stabilizes against carbide precipitation, eliminating intergranular corrosion in welded/heat-affected zones.
Chemical Composition
|
C |
Si |
Mn |
P |
S |
Cr |
Ni |
N |
|
|
Min |
0.04 |
- |
- |
- |
- |
17 |
9 |
- |
|
Max |
0.1 |
1 |
2 |
0.045 |
0.03 |
19 |
12 |
0.1 |
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% |
|
7.92 |
1400~1450 |
515 |
205 |
40% |
Feature
321H is a high-carbon variant (0.04%~0.10% C) of 321 stainless steel, specifically developed for high-temperature service. While retaining the fundamental properties of 321, it achieves combined resistance to intergranular corrosion and enhanced high-temperature strength through controlled higher carbon content and titanium stabilization
Applications
High-Temperature Pressure Components for Extreme Conditions:
Aerospace: Aircraft engine exhaust pipes, boiler superheaters (long-term service below 800°C)
Petrochemical Systems: Cracking furnace tubes, high-temperature reactors
Thermal Processing Equipment: Heat treatment furnace rollers, high-temperature fasteners
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