317L / X2CrNiMo18-15-4
1.4438Low-carbon austenitic with 3-4% Mo — higher Mo than 316L (2-3%). Better pitting and crevice corrosion resistance (PREN ~30 vs ~25). Used in aggressive chemical environments where 316L is borderline: pharmaceutical, dye production, and organic acid processing.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 317L | S31703 | REF |
| 🇪🇺 | EN | Europe | X2CrNiMo18-15-4 | 1.4438 | 100% |
Sources: ASTM A240, EN 10088-2
Chemical composition comparison (wt%)
Side-by-side: 317L / X2CrNiMo18-15-4 (EN) (EN 10088-2) vs X2CrNiMo18-15-4 (EN) (EN 10088-2)
| Element | 317L / X2CrNiMo18-15-4 (EN) | X2CrNiMo18-15-4 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.03% | 0–0.03% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–2% | 0–2% | OK |
| Cr | 17.5–19.5% | 17.5–19.5% | OK |
| Mo | 3–4% | 3–4% | OK |
| Ni | 13–16% | 13–16% | OK |
| N | 0–0.11% | 0–0.11% | OK |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–700 | MPa |
| Yield Strength | ≥ 200 | MPa |
| Elongation | ≥ 40 | % |
| Elastic Modulus | ≥ 200 | GPa |
| Density | ≥ 7.98 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1050–1120 °C | water | Rapid cooling required | Higher Mo requires higher solution temp than 316L |
Compatibility verdict
317L / X2CrNiMo18-15-4 and X2CrNiMo18-15-4: 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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