Stainless steel for medical implants - The high level of nitrogen in BioDur 108 stainless steel provides enhanced mechanical and physical properties for medical implants

摘要

Higher strength, better corrosion resistance, and improved biocompatibility compared with other BioDur alloys have been demonstrated by BioDur 108, an essentially nickel-free stainless steel alloy designed for medical implants. As Table 1 shows, nitrogen is present at levels >0.90%, compared with 0.10 to 0.50% for the other Biodur alloys, and nickel levels are no higher than 0.05%, compared with 9 to 15%. The alloy also includes manganese in the range of 21 to 24%, much higher than the 2 to 6% manganese levels of the other BioDur alloys. The higher manganese content is required to maintain austenite stability in high-nitrogen strengthened alloys such as Biodur 108.