X10CrAlSi25
1.4762High-chromium ferritic stainless steel (23–26% Cr) with aluminum (1.2–1.7%) and silicon (0.7–1.4%) additions for maximum scaling resistance up to 1150°C. The highest oxidation resistance among ferritic stainless steels. Non-hardenable. Resistant to sulfur compounds and reducing gases. Used for furnace linings, kiln rollers, burner parts, thermocouple protection tubes, steam boiler superheater elements, and extreme-temperature components. Equivalent to AISI 446.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 446 | S44600 | REF |
Sources: ASTM A276
Chemical composition comparison (wt%)
Side-by-side: X10CrAlSi25 (EN) (EN 10095:1999) vs ASTM
| Element | X10CrAlSi25 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.12% | — | — |
| Si | 0.7–1.4% | — | — |
| Mn | ≤ 1% | — | — |
| P | ≤ 0.04% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 23–26% | — | — |
| Al | 1.2–1.7% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 520–720 | MPa |
| Yield Strength | ≥ 280 | MPa |
| Elongation | ≥ 10 | % |
| Hardness HB | ≤ 220 | HB |
| Density | ≥ 7.7 | g/cm3 |
| Elastic Modulus | ≥ 220 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 800–900 °C | air | — | Not hardenable by heat treatment. Ferritic structure. |
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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