.png){kind=small}
| Grade | Code | UNS | Austenitic Stainless Steel |
| AISI 314 | X15CrNiSi25-21 | S31400 |
AISI 314, an austenitic heat-resistant stainless steel, provides good resistance to oxidation and scaling at elevated temperatures. It can offer scaling resistance in air up to approximately 1150 °C; however, the permissible service temperature must be determined according to the atmosphere, mechanical load, thermal cycling and exposure time. Its weldability and formability are generally good; the risk of structural embrittlement during prolonged exposure within the 600–950 °C range should be considered.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | N % | Fe % |
| ≤ 0.20 | 1.50–2.50 | ≤ 2.00 | ≤ 0.045 | ≤ 0.015 | 24.00 – 26.00 | 19.00 – 22.00 | ≤ 0.11 | Bal. |
| Form | Size range | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar | ≤ 160 mm | ≥ 230 | 550–750 | ≥ 30 | ≤ 223 | 7.90 |
| Plate | 3 ≤ * ≤ 75 mm | ≥ 230 | 550–750 | ≥ 30 | ≤ 223 | 7.90 |
| Sheet | 0.5 ≤ * < 3 mm | ≥ 230 | 550–750 | ≥ 28 | ≤ 223 | 7.90 |
*Thickness
| Sector | Most common products |
| Industrial furnaces and heat treatment | Heat-treatment baskets, hardening and annealing boxes, furnace grates |
| Iron, steel and non-ferrous metals | Furnace conveyor belts, high-temperature hangers and hooks, burner nozzles |
| Energy and steam boilers | Superheater hangers, combustion chamber covers, boiler heating tubes |
| Glass, ceramics and enamel | Glass-furnace grates, porcelain firing baskets, enamelling grates |
| Chemical and petrochemical | Pyrolysis furnace components, high-temperature valves, flanges |
| Cement | In-furnace support components, grate plates, heat-resistant chains |
| Waste incineration plants | Incinerator inner linings, burner support components, heat shields |
| Mechanical and plant engineering | High-temperature fans, guide plates, thermal-process carriers |
AISI 314 has a higher coefficient of thermal expansion and lower thermal conductivity than carbon steels. Therefore, expansion allowances should be provided in large furnace components, and distortion should be controlled in welded structures. This grade cannot be hardened by heat treatment and gains hardness only through cold working. Owing to its austenitic structure, it is essentially non-magnetic in the solution-annealed condition and generally does not require post-weld heat treatment.
AISI 314, UNS S31400, 1.4841, X15CrNiSi25-21
| Product form | ASTM | EN |
| Bar | ASTM A276/A276M – Type 314; ASTM A314 for bars intended for forging | EN 10095 – 1.4841 / X15CrNiSi25-21 |
| Plate | — | EN 10095 – 1.4841 / X15CrNiSi25-21 |
| Sheet | — | EN 10095 – 1.4841 / X15CrNiSi25-21 |
AISI 310S is the closest alternative to AISI 314 in terms of high-temperature and oxidation resistance.
AISI 309S is a more economical alternative that provides sufficient heat resistance at lower service temperatures.
AISI 316Ti may be considered for applications where the service temperature is lower and corrosion resistance becomes the priority.
Acerinox – EN 1.4841 / ACX 325
Swiss Steel Group – 1.4841 / AISI 314
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
