Manufacturer introduction Cobalt chromium molybdenum alloy
Publish Time:
2020-10-30
CoNiCrMo alloy is one of the promising forged cobalt-based alloys, originally known as MP35N. It exhibits high corrosion resistance in seawater (containing chloride ions) under stress. Cold working increases the alloy's strength, but is quite difficult, especially for large components like hip stems; hot forging is more suitable.
Forged CoNiCrMo alloy has similar wear resistance to cast CoCrMo alloy, offering good fatigue resistance and high tensile strength. This makes it suitable for applications requiring long lifespan and resistance to fracture or stress fatigue, such as artificial joints in hip replacements. This advantage is significant for the difficult and expensive surgery of deeply implanting the prosthesis into the femoral medullary canal.
The elastic modulus of cobalt-based alloys does not change with the maximum tensile strength; its value ranges from 220 to 234 GPa, higher than other materials such as stainless steel.
CoCrMo alloys are particularly susceptible to work hardening, so they cannot be manufactured using the same processes as other metals and require vacuum investment casting. Controlling the mold temperature controls the grain size of the casting; higher temperatures result in coarser grains, reducing strength but also producing more widely spaced and larger carbides, reducing material brittleness.
Currently, the main domestic units producing, researching, and promoting cobalt-chromium-molybdenum alloys include the Iron and Steel Research Institute and Beijing Rongdian Metal Co., Ltd.
keyword： Alloy,Elasticity,Catheter
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