Introduction to Stellite Alloy:
Cobalt alloys (cobalt-based superalloys) are hard alloys that are resistant to various types of wear and corrosion and high temperature oxidation. The so-called cobalt chromium tungsten alloy or Stellite alloy was invented by American Elwood Hayness in 1907.
Cobalt alloy classification:
According to the purpose of use, cobalt 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-resistant and high-temperature resistant or wear-resistant and corrosion-resistant. In some cases, the workpiece may also require high temperature resistance, wear resistance and corrosion resistance, and the more complicated Under the working conditions, the more the advantages of cobalt alloys can be realized.
Basic theory of cobalt alloys:
The cobalt alloy matrix is a Co-Cr alloy solid solution of a face-centered cubic fcc structure. According to the W and C contents, a considerable amount of chromium-rich carbide (M7C3 type) precipitates on the substrate, and thus has a good metal- The wear resistance of metal wear and wear resistance, the hardness of the alloy increases with the increase of W and C content. The alloy strength and hardness can be maintained above 800 ° C, with good resistance to wear, high temperature, corrosion, cavitation and other comprehensive properties. Cobalt chromium tungsten and cobalt chromium molybdenum are two major categories. Cobalt-chromium-tungsten focuses on high-temperature wear resistance; cobalt-chromium-molybdenum focuses on high-temperature corrosion resistance.
WR6B, Stellite Alloy 12 is one of the most famous cobalt-based wear-resistant alloys. It has excellent wear resistance and toughness. It can adapt to most working conditions and has wide application. The hardness is 37-45HRC. It is mainly used for chemical wear plates and wear-resistant. Rod, steam chemical valve seat, turbine blade protection, flushing bushing, hot dip galvanized sunken roll, etc.
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