310S / X8CrNi25-21
1.4845High-chromium, high-nickel austenitic for the highest service temperatures among standard austenitics. Oxidation resistance to ~1100°C (continuous). Higher Cr/Ni than 309S. Used for furnace parts, radiant tubes, heat treatment baskets, kiln liners, and high-temperature flue gas equipment.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 310S | S31008 | REF |
| 🇪🇺 | EN | Europe | X8CrNi25-21 | 1.4845 | 100% |
Sources: ASTM A240, EN 10088-2
Chemical composition comparison (wt%)
Side-by-side: 310S / X8CrNi25-21 (EN) (EN 10088-2) vs X8CrNi25-21 (EN) (EN 10088-2)
| Element | 310S / X8CrNi25-21 (EN) | X8CrNi25-21 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.1% | 0–0.1% | OK |
| Si | 0–1.5% | 0–1.5% | OK |
| Mn | 0–2% | 0–2% | OK |
| Cr | 24–26% | 24–26% | OK |
| Ni | 19–22% | 19–22% | OK |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–700 | MPa |
| Yield Strength | ≥ 210 | MPa |
| Elongation | ≥ 35 | % |
| Elastic Modulus | ≥ 196 | GPa |
| Density | ≥ 7.9 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1030–1100 °C | water | Rapid cooling required | Avoid prolonged 600-900°C exposure — sigma phase risk |
Compatibility verdict
310S / X8CrNi25-21 and X8CrNi25-21: 100% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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