X2CrNiMoN17-13-5
1.4439High-molybdenum austenitic stainless steel with 4.0-5.0% Mo — significantly higher than 316L (2.0-2.5%). Provides substantially improved resistance to pitting and crevice corrosion in chloride environments (PREN ~35, vs ~25 for 316L). Low carbon (≤0.03%) and N addition for sensitization resistance and strength. Used for chemical processing in aggressive chloride media, flue gas desulfurization, pulp & paper bleach plants, and seawater-cooled heat exchangers where 316L is insufficient but duplex is not desired.
Chemical composition comparison (wt%)
Side-by-side: X2CrNiMoN17-13-5 (EN) (EN 10088-2) vs ASTM
| Element | X2CrNiMoN17-13-5 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.03% | — | — |
| Si | ≤ 1% | — | — |
| Mn | ≤ 2% | — | — |
| P | ≤ 0.045% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 16.5–18.5% | — | — |
| Mo | 4–5% | — | — |
| Ni | 12.5–14.5% | — | — |
| N | 0.12–0.22% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 580–780 | MPa |
| Yield Strength | ≥ 270 | MPa |
| Elongation | ≥ 35 | % |
| Hardness HB | ≤ 220 | HB |
General
| Property | Value | Unit |
|---|---|---|
| Density | ≥ 8 | 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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