X8CrNi25-21 (material number 1.4845) is the EN designation for AISI 310S, a heat-resistant austenitic stainless steel with high chromium (~25%) and nickel (~20%) content. It offers outstanding oxidation resistance, thermal stability, and scaling resistance up to 1100–1150°C.
| Standard | Equivalent Grade |
|---|---|
| EN (Europe) | 1.4845 / X8CrNi25-21 |
| AISI / ASTM | 310S |
| UNS | S31008 |
| JIS (Japan) | SUS310S |
| GB (China) | 0Cr25Ni20 / 06Cr25Ni20 |
| BS (UK) | 310S31 |
| ISO | X8CrNi25-21 |
| Element | Content (%) |
|---|---|
| C | ≤ 0.08 |
| Cr | 24.0 – 26.0 |
| Ni | 19.0 – 22.0 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.50 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Fe | Balance |
| Grade : | X8CrNi25-21 | ||||
| Number: | 1.4845 | ||||
| Classification: | Austenitic heat-resisting steel | ||||
| Density: | 7.9 g/cm ³ | ||||
| Standard: |
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Both 310 and 310S are 25Cr-20Ni high chromium nickel austenitic stainless steels. The main difference lies in the carbon content (310≤0.25%, 310S≤0.08%). 310S has significantly improved high-temperature intergranular corrosion resistance and weldability due to its low carbon characteristics, and is more suitable for high-temperature equipment such as industrial furnace components that require frequent welding; 310 has slightly higher room temperature strength in non-welding scenarios due to its higher carbon content. Both can exhibit excellent oxidation resistance above 1000℃.
310S Seamless and Welded Pipes
1.4845 Stainless Steel Plates & Sheets
X8CrNi25-21 Rods, Bars, Fittings
Custom polished or pickled surface (Ra ≤ 0.8μm)
All products are available with EN 10204 3.1/3.2 MTC, and certifications like PED, DNV, TUV upon request.These products are available in a wide variety of sizes. For detailed specifications and product information, please visit the following website.
Products:https://www.gneestainless.com/
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We offer cut-to-size 1.4845 stainless steel pipes and plates with competitive pricing, fast delivery, and full traceability.
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