X15CrNiSi20-12
1.4828Heat-resistant austenitic stainless steel with high silicon content (1.5–2.5%) for exceptional scaling resistance up to 1000°C. The silicon creates a protective SiO₂ layer supplementing the chromium oxide barrier. Excellent resistance to carburization and sulfidation. Used for furnace parts, burner nozzles, kiln furniture, hardening boxes, annealing baskets, and high-temperature industrial process components. Equivalent to AISI 309.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 309 | S30900 | REF |
| 🇫🇷 | AFNOR | France | Z17CNS20-12 | — | 95% |
Sources: ASTM A240, NF EN 10095
Chemical composition comparison (wt%)
Side-by-side: X15CrNiSi20-12 (EN) (EN 10095:1999) vs Z17CNS20-12 (AFNOR)
| Element | X15CrNiSi20-12 (EN) | Z17CNS20-12 (AFNOR) | Overlap |
|---|---|---|---|
| C | ≤ 0.2% | — | — |
| Si | 1.5–2.5% | — | — |
| Mn | ≤ 2% | — | — |
| P | ≤ 0.045% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 19–21% | — | — |
| Ni | 11–13% | — | — |
| N | ≤ 0.11% | — | — |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–750 | MPa |
| Yield Strength | ≥ 230 | MPa |
| Elongation | ≥ 30 | % |
| Hardness HB | ≤ 220 | HB |
| Density | ≥ 7.9 | g/cm3 |
| Elastic Modulus | ≥ 200 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1050–1150 °C | air | — | Fast cooling in air or water. Embrittlement risk at 600-900°C. |
Compatibility verdict
X15CrNiSi20-12 and Z17CNS20-12: 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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