321H Stainless Steel
321H is a titanium stabilized austenitic stainless steel and the high carbon variant of the 321 series. Titanium improves resistance to intergranular corrosion and high temperature stability for welded, high pressure service. The source describes good performance in oxidizing media such as nitric acid and hot steam, but lower corrosion resistance in chloride environments such as seawater. Its combination of titanium stabilization and higher carbon supports intergranular corrosion resistance, high temperature strength at the 800℃ level, and processing adaptability for petrochemical, energy, and aerospace equipment.
Product details
Chemical composition
| 321H | C | Si | Mn | P | S | Cr | Ni | N | Ti |
|---|---|---|---|---|---|---|---|---|---|
| min | 0.04 | – | – | – | – | 17 | 9 | – | 0.7 |
| max | 0.1 | 1 | 2 | 0.045 | 0.03 | 19 | 12 | 0.1 | 4*（C+N) |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| 321H | S32109 | 1.4878 | SUS321H | 07Cr19Ni11Ti 1Cr18Ni11Ti | X12CrNiTi 18-9 X8CrNiTi 18-10 X6CrNiTiB 18-10 SS2337 |
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Physical properties
| Density g/cm³ | 7.96 |
|---|---|
| Melting range ℃ | 1398-1427 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 16.2 |
| Specific heat J/kg•℃ | 500 |
| Elastic modulus GPa | 196 |
| Electrical resistivity μΩ•m | 0.75-0.78 |
| Linear expansion coefficient a/10-6℃-1 | 16.5 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥520 |
|---|---|
| Yield strength RP0.2 N/mm | ≥205 |
| Elongation % | ≥40 |
| Hardness HB | ≤187 |
| *After solution heat treatment | |
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Applications
- Boiler systems for power generation
- Petrochemical heat-exchange systems
- High-temperature aerospace-engine components
- Corrosion-resistant chemical-process equipment
- Heavy-industrial exhaust systems
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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