BÖHLER P504 is a wrought nitrogen strengthened 21chromium—10nickel—3manganese—2.5molybdenum stainless steel for surgical implants. It is a highly corrosion resistant non-magnetisable stainless austenitic steel – nitrogen alloyed – resistant to intergranular corrosion. Compared to standard Cr-Ni-Mo steel, it offers increased strength and thus also better fatigue properties. The steel is produced as remelt grade and thus fulfils the usual requirements for steel purity as specified for implant material.
| Market grade | UNS |
|---|---|
| REX 734 | S31675 |
| ASTM | Others |
|---|---|
| F1586 | ISO 5832-9 |
| C | Si | Mn | P | S | Cr | Mo | Ni | Cu | Nb | N | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| max. 0.08 | max. 0.75 | 2.00 to 4.25 | max. 0.025 | max. 0.01 | 19.5 to 22.0 | 2.0 to 3.0 | 9.0 to 11.0 | max. 0.25 | 0.25 to 0.80 | 0.25 to 0.50 |
