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Stainless steel 317LN is a nitrogen alloyed austenitic stainless steel having high nitrogen content than other austenitic stainless steels. It has higher yield and tensile strength than 317L. This low carbon grade steel provides resistance to sensitization during welding and thermal processes. Low carbon content in its composition makes the alloy resistant to inter granular corrosion. It also offers excellent corrosion resistance to organic, sulfuric and phosphoric acids.
| Element | Content (%) |
|---|---|
| Iron, Fe | 63.43 |
| Chromium, Cr | 18.2 |
| Nickel, Ni | 14 |
| Molybdenum, Mo | 4.2 |
| Nitrogen, N | 0.15 |
| Carbon, C | 0.02 |
| Grade | UNS | DIN | EN | AMS |
|---|---|---|---|---|
| 317LN | UNS S31753 | - | 1.4439 | - |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | ≥590 MPa | ≥85600 psi |
| Yield strength | ≥285 MPa | ≥41300 ksi |
| Modulus of elasticity | 200 GPa | 29000 ksi |
| Shear modulus | 77 GPa | 11200 ksi |
| Poissons ratio | 0.299 | 0.299 |
| Elongation at break | ≥40% | ≥40% |
| Property | Density: kg/dm³ | Hardness: HB (<=35mm) | Magnetizable | Polishable |
|---|---|---|---|---|
| Value | 8,1 | <=350 / B90 | No | Good |
The properties of 317LN are similar to other conventional austenitic stainless steels. Heat treatment can be carried out at temperatures ranging from 1080 to 1175°C (1975 to 2150°F) followed by rapid water quenching. This grade is not hardenable.
Main Applications: 317LN stainless steel is ideal for medical device manufacturing. It is lead-free, non-toxic, and has excellent corrosion resistance. Specifically, it is used for surgical instruments, medical equipment, and implantable medical devices as it maintains hygiene performance and prevents contamination.
