X2CrNiMoN17-13-5
1.4439High-Mo austenitic stainless — 4-5% Mo (vs 2-2.5% for 316L). N addition for strength and PREN. Superior pitting and crevice corrosion resistance in chloride environments compared to 316L/317L. PREN ~34-38. UNS S31726 / AISI 317LMN. Used for chemical plant, pharmaceutical equipment, pulp bleach plants, and FGD systems where 316L would fail. Resistant to intergranular corrosion even after welding.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS S31726 / 317LMN | S31726 | REF |
| 🇪🇺 | EN | Europe | X2CrNiMoN17-13-5 / 1.4439 | 1.4439 | 100% |
Sources: ASTM A240, EN 10088-2
Chemical composition comparison (wt%)
Side-by-side: X2CrNiMoN17-13-5 (EN) (EN 10088-2) vs X2CrNiMoN17-13-5 / 1.4439 (EN) (EN 10088-2)
| Element | X2CrNiMoN17-13-5 (EN) | X2CrNiMoN17-13-5 / 1.4439 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.03% | 0–0.03% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| Cr | 16.5–18.5% | 16.5–18.5% | OK |
| Mo | 4–5% | 4–5% | OK |
| Ni | 12.5–14.5% | 12.5–14.5% | OK |
| N | 0.12–0.22% | 0.12–0.22% | OK |
Mechanical properties
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 580–780 | MPa |
| Yield Strength | ≥ 270 | MPa |
| Elongation | ≥ 35 | % |
| Elastic Modulus | ≥ 200 | GPa |
| Density | ≥ 8 | g/cm3 |
Compatibility verdict
X2CrNiMoN17-13-5 and X2CrNiMoN17-13-5 / 1.4439: 100% 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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