317 vs 316
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
317
Stainless Steel
317 increases molybdenum to 3–4% over 316, giving a further step in pitting and acid resistance for aggressive chemical service. It sits between 316L and the 6% molybdenum super-austenitics.
Standards: DIN 1.4449 · AISI 317 · JIS SUS317 · GB 06Cr19Ni13Mo3
316
Stainless Steel
316 adds 2–3% molybdenum to the 18-10 base of 304, which markedly improves pitting and crevice corrosion resistance in chloride media. It is the standard marine and chemical-process stainless.
Standards: DIN 1.4401 · AISI 316 · JIS SUS316 · GB 06Cr17Ni12Mo2
Chemical composition compared (%)
| Element | 317 | 316 |
|---|---|---|
| C | ≤0.08 | ≤0.08 |
| Si | ≤0.75 | ≤0.75 |
| Mn | ≤2.00 | ≤2.00 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
| Cr | 18.00–20.00 | 16.00–18.00 |
| Ni | 11.00–15.00 | 10.00–14.00 |
| Mo | 3.00–4.00 | 2.00–3.00 |
| N | — | ≤0.10 |
Properties compared
| Property | 317 | 316 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Hardness | ≤217 HB (annealed) | ≤217 HB (annealed) |
| Tensile strength | 515–690 MPa | 515–690 MPa |
| Density | 7.90 g/cm³ | 7.90 g/cm³ |
| Yield strength | — | ≥205 MPa |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 317 · 316. Substitution decisions for certified parts stay with the design authority.