ASTM F562 / UNS R30035 / MP35N Surgical Implant

ASTM F562-13 is a sub-type specification of Cobalt MP35N, a Multiphase cobalt-based alloy with ultra-high-strength of 260 ksi to 300 ksi (1790 mPa to 2070 mPa). This specification covers requirements of wrought 35cobalt-35nickel-20chromium-10molybdenum alloy (UNS R30035) in the form of bar and wire, used for the manufacture of surgical implants. This alloy depends on combinations of work strengthening and aging to attain a variety of combinations of strength and ductility.

Thanks to the unique qualities of ASTM F562-13, it is used for the medical industry, mainly for surgical implants, such as bone plates, screws, pins. The good ductility and work-strengthening of this alloy make it useful in orthodontic and prosthetic applications, such as dental braces or replacement body parts. ASTM F562-13 also finds use in other fields that require high corrosion resistance, and it can be used for the manufacturing of chemical equipment or seawater equipment.

 

Like similar cobalt-nickel alloys, ASTM F562-13 can be work-strengthened by extruding, drawing, rolling, and swaging. The highest tensile strength can be obtained by combining work-strengthening with an additional aging process at 1200° F (540° C to 650° C). That said, for best sulfide resistance, the aging process should take place at 425° F (220° C).