This superalloy is typically double melted to remove impurities.
A reducing atmosphere is preferred for thermal treatment but inert gas can be used. MP35N will fully anneal at 1010-1177°C in just a few minutes. For optimum mechanical properties, cold worked MP35N should be aged at 583-593°C for four hours.
MP35N is an excellent combination of strength and corrosion resistance. Typically used in the cold-worked condition, tensile strengths are comparable to 304. End uses in the medical field are pacing leads, stylets, catheters and orthopaedic cables.
Cobalt based alloys develop a highly polished appearance as they are drawn to fine diameters. Surface roughness can be less than 5 microinches RMS when processed using dies and measured with a profilometer. Diameters over 0.040" are finished with polycrystalline dies and exhibit a rougher surface than natural diamond dies. Diameters over 0.100" have an even rougher surface because they are drawn with carbide dies. Additional finish treatments can enhance the surface of the wire.