310S
UNS S31008
Overview
High-chromium, high-nickel austenitic stainless steel designed for continuous high-temperature service up to 1150°C. The 25% Cr / 20% Ni composition provides exceptional oxidation resistance and carburization resistance. 310S (low carbon, 0.08% max) resists sensitization and maintains ductility after prolonged high-temperature exposure. Widely used in furnace components, heat treatment equipment, and thermal processing.
Chemical Composition (wt%)
| Element | Min | Max |
|---|---|---|
| C (Carbon) | — | 0.08 |
| Mn (Manganese) | — | 2 |
| Si (Silicon) | — | 1.5 |
| P (Phosphorus) | — | 0.045 |
| S (Sulfur) | — | 0.03 |
| Cr (Chromium) | 24 | 26 |
| Ni (Nickel) | 19 | 22 |
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) | — |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) | — |
| Elongation | ≥ 40% | — |
| Hardness | ≤ 90 HRB | annealed |
| Density | 7.9 g/cm³ | — |
Physical Properties
| Property | Value |
|---|---|
| Melting Range | 1400 – 1455 °C |
| Max Service Temp | 1150°C (continuous) |
| Thermal Conductivity | 14.2 W/m·K (at 100°C) |
Corrosion Resistance
Outstanding oxidation resistance in air up to 1150°C — significantly better than 304/316 at elevated temperatures. Excellent resistance to carburizing and nitriding atmospheres. Good resistance to molten salts and sulfidation. Not intended for wet corrosion service — use 316 or duplex grades for chloride environments at ambient temperatures.
Typical Applications
Related Standards
Available Products in This Material
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