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) |
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 |
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 |
Mechanical properties
| Tensile strength Rm N/mm | ≥520 |
|---|---|
| Yield strength RP0.2 N/mm | ≥205 |
| Elongation % | ≥40 |
| Hardness HB | ≤187 |
| *After solution heat treatment | |
Available product forms
- Round Bar
- Plate
- Pipe & Tube
- Welding Consumables
- Flanges
- Hex Bolts
- Threaded Rod
- Nuts & Washers
Technical values are transcribed and translated from the supplied Milike Chinese catalogue. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
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