cobalt based alloy

Cobalt is a metal element, the element symbol Co, atomic number 27, belongs to group VIII. Cobalt is a silver-gray lustrous metal with a melting point of 1495°C and a boiling point of 2870°C, It is ductile and ferromagnetic, and cobalt is relatively stable in air at room temperature. When the temperature is higher than 300 °C, cobalt begins to oxidize in air. Cobalt is widely used in aerospace, machinery manufacturing, electrical, chemistry, ceramics and other industrial fields because of its good high temperature resistance, corrosion resistance and magnetic properties, etc..

Cobalt-based alloy is a cemented carbide that is resistant to various types of wear and corrosion, as well as high temperature oxidation. Cobalt-based alloys are commonly known as cobalt-chromium-tungsten or cobalt-chromium-molybdenum alloy or Stellite alloy (Stellite alloy was invented by American Elwood Hayness in 1907). Cobalt-based alloys use cobalt as the main component, contain a considerable amount of nickel, chromium, tungsten, and a small amount of alloying elements such as molybdenum, niobium, tantalum, titanium, lanthanum, and occasionally iron. According to the different components in the alloy, they can be made into welding wire, castings and forgings and powder metallurgy parts.

According to the classification of use, cobalt-based alloys can be divided into cobalt-based wear-resistant alloys, cobalt-based high-temperature alloys and cobalt-based wear-resistant and aqueous corrosion-resistant alloys. Under normal working conditions, it is actually both wear and high temperature resistance or wear and corrosion resistance. Some working conditions may also require high temperature resistance, wear and corrosion resistance at the same time. The more complicated environments, the advantages of cobalt-based alloys can be more reflected.


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