X15CrNiSi25-21
1.4841Heat-resistant austenitic stainless steel with 25% Cr and 21% Ni for outstanding oxidation resistance up to 1150°C in continuous service. Higher Si content (1.5-2.5%) enhances scaling resistance. Used for furnace parts, heat treatment baskets, muffles, radiant tubes, burner nozzles, thermocouple sheaths, and kiln furniture. The standard material for furnace construction. Similar to AISI 310/314. Not recommended for sulphur-containing atmospheres.
Chemical composition comparison (wt%)
Side-by-side: X15CrNiSi25-21 (EN) (EN 10095) vs ASTM
| Element | X15CrNiSi25-21 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.2% | — | — |
| Si | 1.5–2.5% | — | — |
| Mn | ≤ 2% | — | — |
| P | ≤ 0.045% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 24–26% | — | — |
| Ni | 19–22% | — | — |
| N | ≤ 0.11% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–750 | MPa |
| Yield Strength | ≥ 210 | MPa |
| Elongation | ≥ 30 | % |
General
| Property | Value | Unit |
|---|---|---|
| Density | ≥ 7.85 | g/cm3 |
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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