A concise material reference for grade identity, chemistry and service considerations.
Values below are general grade limits commonly associated with 310S. The certified material test report and applicable product standard govern supplied material.
| Element | Mass % |
|---|---|
| Carbon (C) | ≤ 0.08% |
| Chromium (Cr) | 24.0–26.0% |
| Nickel (Ni) | 19.0–22.0% |
| Manganese (Mn) | ≤ 2.00% |
| Silicon (Si) | ≤ 1.50% |
| Phosphorus (P) | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% |
| Iron (Fe) | Balance |
310S is intended for elevated-temperature service and offers very good oxidation resistance. A commonly cited upper service temperature is about 1050°C (1922°F) in dry air, but thermal cycling and the process atmosphere can lower the practical limit.
The grade is primarily selected for heat resistance. Its wet-corrosion performance must be assessed against the specific medium; it is not a universal substitute for molybdenum-bearing grades.
310S can be formed and welded using procedures appropriate for high-alloy austenitic stainless steels. Welding consumables, heat input and post-fabrication cleaning should be specified for the service.
Solution-annealed 310S is generally non-magnetic. Cold work and fabrication may produce a small magnetic response.
Grade identifiers and high-temperature guidance were checked against Outokumpu Therma 310S/4845 data. Purchase requirements should reference the current applicable ASTM, EN or project specification.
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