X8CrNi25-21
1.4845Heat-resistant austenitic stainless steel with 25% chromium and 21% nickel. Maximum continuous service temperature up to 1050°C in oxidizing atmospheres. Standard material for furnace construction, heat treatment baskets and fixtures, radiant tubes, muffles, and high-temperature chemical processing. Good resistance to sulfur-containing atmospheres. Equivalent to AISI 310S.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 310S | S31008 | REF |
| 🇫🇷 | AFNOR | France | Z8CN25-20 | — | 95% |
Sources: ASTM A240, NF EN 10095
Chemical composition comparison (wt%)
Side-by-side: X8CrNi25-21 (EN) (EN 10095:1999) vs Z8CN25-20 (AFNOR)
| Element | X8CrNi25-21 (EN) | Z8CN25-20 (AFNOR) | Overlap |
|---|---|---|---|
| C | ≤ 0.1% | — | — |
| Si | ≤ 1.5% | — | — |
| Mn | ≤ 2% | — | — |
| P | ≤ 0.045% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 24–26% | — | — |
| Ni | 19–22% | — | — |
| N | ≤ 0.11% | — | — |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–700 | MPa |
| Yield Strength | ≥ 210 | MPa |
| Elongation | ≥ 35 | % |
| Hardness HB | ≤ 192 | HB |
| Density | ≥ 7.9 | g/cm3 |
| Elastic Modulus | ≥ 200 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1050–1150 °C | water | — | Rapid cooling required |
Compatibility verdict
X8CrNi25-21 and Z8CN25-20: 95% 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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