Stainless steel 310S is austenitic chromium, nickel stainless steel (.08% max carbon) with good oxidation resistance and strength at high temperatures. It resist oxidation in continuous service up to 2000ºF gave decreasing sulphur gasses are not present. It is additionally utilized for intermittent service at temperatures up to 1900°F due to it resists rescaling and has a low coefficient of expansion. This factor reduces the tendency of the steel to warp in heat service. 310s are same as 310 aside from lower carbon content to minimize carbide precipitation during welding.Cyclic conditions reduce its oxidation resistance, and a maximum operating temperature of 1900°F is generally recommended if cycling is involved.
Having a lower coefficient of expansion than most 300 stainless steels, 310S may be used in operations involving moderately severe thermal cycling, such as rapid air cooling. It is not usually recommended for liquid quenching. Although 310S has less resistance to absorption of carbon and nitrogen than the higher alloys such as 330 and 333, it is widely used in moderately carburizing atmospheres such as encountered in petro-chem plants.
Because of ts high chromium and medium nickel contents, 310S may be used in atmospheres containng moderate amounts of sulfur.
Specifications – Stainless Steel 310S
- ASTM: A312, A403, A182
- ASME: SA312, SA403, SA182
Chemical properties of SS 310 / 310S
Weight % (all values are maximum unless a range is otherwise indicated)| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
|---|---|---|---|---|---|---|---|---|---|
| SS 310 | 0.015 max | 2.0 max | 0.15 max | 0.020 max | 0.015 max | 24.00 – 26.00 | 0.10 max | 19.00 – 21.00 | 54.7 min |
| SS 310S | 0.08 max | 2.0 max | 1.00 max | 0.045 max | 0.030 max | 24.00 – 26.00 | 0.75 max | 19.00 – 21.00 | 53.095 min |
Mechanical properties of SS 310 / 310S
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|
| 7.9 g/cm3 | 1402 °C (2555 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 0.4 |
Stainless steel 310/310s sheets & plates equivalent grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 310 | 1.4841 | S31000 | SUS 310 | 310S24 | 20Ch25N20S2 | - | X15CrNi25-20 |
| SS 310S | 1.4845 | S31008 | SUS 310S | 310S16 | 20Ch23N18 | - | X8CrNi25-21 |
Design Features – Stainless Steel 310S
- Austenitic stainless steel with excellent high temperature oxidation resistance.
- Good for continuous exposure to 2100°F, intermittent service to 1900°F.
- Better elevated temperature creep strength than the 18-8 grades.
- Good resistance to both carburizing and reducing environments.
- General corrosion resistance better than Types 304 and 309.
- May be susceptibe to chloride stress corrosion cracking.
- Ease of fabrication.
Typical Applications – Stainless Steel 310S
- Sulfur bearing gas atmospheres
- Molten salt applications
- Heat exchangers
- Heat recuperator tubing
Tensile Requirements – Stainless Steel 310S
- Tensile Strength (KSI): 75
- Yield Strength (KSI): 30