317 | 317L Stainless Steel: Forms, Composition
Jan 29, 2026
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Equivalent Grades of 317 Stainless Steel
UNS: S31700
EN: X3CrNiMo18-12-3 (1.4449)
JIS: SUS317
317 Standards
ASTM A240
ASTM A276
ASTM A312
ASTM A479
Chemical Composition of 317 Stainless Steel
317 stainless steel contains high levels of chromium, nickel and molybdenum, which provides excellent corrosion resistance and strong mechanical properties.
| Element | Composition Range |
| Carbon (C) | ≤ 0.08% |
| Manganese (Mn) | ≤ 2.00% |
| Silicon (Si) | ≤ 1.00% |
| Chromium (Cr) | 18.0% – 20.0% |
| Nickel (Ni) | 11.0% – 15.0% |
| Molybdenum (Mo) | 3.0% – 4.0% |
| Nitrogen (N) | ≤ 0.10% |
| Sulfur (S) | ≤ 0.03% |
| Phosphorus (P) | ≤ 0.045% |
Properties of 317 Stainless Steel
Key Features
The key features of 317 stainless steel are its excellent corrosion resistance, strength and machinability, making it an excellent performer in demanding environments.
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