SS 310S vs SS 316 difference in composition & properties.
SS 316 contains molybdenum (2–3%); SS 310S has no minimum for it (≤0.75%). Nickel: SS 310S 19–22% against SS 316 10–14%.
310S or 316: heat or corrosion?
SS 310S, with about 25% chromium and 20% nickel, is chosen for oxidation resistance at high temperature, up to about 1100 °C in furnaces and burners. SS 316, with molybdenum, is chosen for corrosion resistance in chlorides and chemicals at normal temperatures.
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Key differences between SS 310S and SS 316
- SS 316 contains molybdenum (2–3%); SS 310S has no minimum for it (≤0.75%).
- Nickel: SS 310S 19–22% against SS 316 10–14%.
- Chromium: SS 310S 24–26% against SS 316 16–18%.
SS 310S vs SS 316 chemical composition (weight %)
| Element | SS 310S | SS 316 |
|---|---|---|
| C | ≤0.08 | ≤0.08 |
| Si | ≤1.5 | ≤0.75 |
| Mn | ≤2 | ≤2 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.03 | ≤0.03 |
| Cr | 24–26 | 16–18 |
| Ni | 19–22 | 10–14 |
| Mo | ≤0.75 | 2–3 |
| N | – | ≤0.1 |
Mechanical properties, equivalents and uses
| Property | SS 310S | SS 316 |
|---|---|---|
| Family | Austenitic stainless | Austenitic stainless |
| Tensile strength, MPa | ≥515 | ≥515 |
| Yield strength, MPa | ≥205 | ≥205 |
| Elongation, % | ≥40 | ≥40 |
| Hardness | ≤217 HB | ≤217 HB |
| Density, g/cm³ | 7.98 | 7.98 |
| UNS | S31008 | S31600 |
| EN | X8CrNi25-21 | X5CrNiMo17-12-2 |
| W.Nr | 1.4845 | 1.4401 |
| JIS | SUS310S | SUS316 |
| IS (India) | X04Cr25Ni20 (IS 6911) | X04Cr17Ni12Mo2 (IS 6911) |
| AISI / ASTM | AISI 310S | AISI 316 |
| Typical uses | Furnace parts, radiant tubes, burners | Chemical, marine, pharma, chloride service |
Mechanical values: Annealed plate, sheet, strip (ASTM A240 / ASME SA240). Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between SS 310S and SS 316?
SS 316 contains molybdenum (2–3%); SS 310S has no minimum for it (≤0.75%). Nickel: SS 310S 19–22% against SS 316 10–14%. Chromium: SS 310S 24–26% against SS 316 16–18%.
Where are SS 310S and SS 316 used?
SS 310S: Furnace parts, radiant tubes, burners. SS 316: Chemical, marine, pharma, chloride service.
Can SS 316 replace SS 310S?
Only if the purchase specification allows it. Check the governing standard, chemistry limits and mechanical properties against the order, and confirm on the mill test certificate.
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Mill test certificate (EN 10204 3.1) supplied with material; third-party inspection on request.
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.