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| Grade | Code | UNS | Austenitic Stainless Steel |
| AISI 310S | 1.4845 | S31008 |
AISI 310S is an austenitic stainless steel grade capable of maintaining mechanical stability and oxidation resistance at elevated temperatures. Its good performance under thermal cycling, ability to retain structural integrity at high temperatures, and good weldability make it suitable for more demanding thermal conditions than standard austenitic stainless steels.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Fe % |
| ≤ 0.08 | ≤ 1.50 | ≤ 2.00 | ≤ 0.045 | ≤ 0.03 | 24.00 – 26.00 | 19.00 – 22.00 | Balance |
| Form | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar | ≥ 210 | 500–700 | ≥ 35 | ≤ 192 | 7.8 |
| Plate | ≥ 210 | 500–700 | ≥ 35 | ≤ 192 | 7.8 |
| Sheet | ≥ 210 | 500–700 | ≥ 33 | ≤ 192 | 7.8 |
| Pipe | ≥ 220 | 530–750 | ≥ 35 | — | 7.8 |
| Sector | Products |
| Furnace & Heat Treatment | Radiant tubes, muffle tubes, furnace internal supports/carriers |
| Petrochemical & Refining | Furnace tubes, pipe hangers, burner components |
| Power & Boiler Systems | Superheater tubes, boiler tube hangers, air heaters |
| Steel & Metal Processing | Annealing boxes, heat-treatment baskets, thermocouple sleeves |
| Cement & Heavy Industry | Burner components, high-temperature ducts, furnace structural components |
| Chemical & Process Industry | Recuperators, heat-exchanger components, high-temperature process equipment |
AISI 310S is a reliable stainless steel grade for components required to operate for extended periods at high temperatures. Its good resistance to rapid heating and cooling conditions, suitability for welded fabrication, and ability to retain its shape at elevated temperatures are among its main advantages. In operating conditions where temperature changes continuously, it can provide a longer service life than standard stainless steels.
AISI 310S, EN 1.4845, X8CrNi25-21, UNS S31008
| Product Form | ASTM Specification | Description |
| Bar | ASTM A276 / A276M | General-purpose hot- or cold-worked stainless steel bars and shapes |
| Bar | ASTM A479 / A479M | Stainless steel bars for boiler and pressure vessel applications |
| Plate | ASTM A240 / A240M | Stainless steel plate for pressure vessels and general use |
| Sheet | ASTM A240 / A240M | Stainless steel sheet and strip products |
| Pipe | ASTM A312 / A312M – TP310S | Seamless, welded, and heavily cold-worked austenitic stainless steel pipes |
AISI 309S / EN 1.4833 – Offers slightly lower temperature capability than AISI 310S but is one of the closest alternatives where high-temperature oxidation resistance is required.
AISI 314 / EN 1.4841 – Provides strong oxidation resistance at high temperatures and is a close alternative to AISI 310S, particularly for hot-service applications such as furnace equipment.
AISI 316Ti / EN 1.4571 – Does not match the high-temperature capability of AISI 310S but can be considered for lower-temperature hot-service and welded applications.
Outokumpu – Therma 310S / 4845
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
