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What is the difference between high-speed steel twist drills and cobalt-containing twist drills?
Cobalt-containing twist drills refer to cobalt-containing high-speed steel twist drills. High-speed steel and cobalt-containing high-speed steel are originally a series of raw materials. However, high-speed steel does not contain cobalt, but cobalt-containing high-speed steel has cobalt. Impurities that enhance tool performance. Cobalt [gǔ] [1], element symbol Co, silver-white ferromagnetic metal, silvery white with a pale pink surface, is located in Period 4 of the Periodic Table, Group VIII, atomic number 27, atomic weight 58.9332, closely packed hexagon The common valence is +2, +3. Cobalt is a shiny steel gray metal, which is relatively hard and brittle. It has ferromagnetism. When it is heated to 1150 ° C, the magnetism disappears. The valence of cobalt is +2 and +3. It does not interact with water at normal temperature and is stable in humid air. It is oxidized to CoO when heated to above 300 ℃ in the air, and burns to Co3O4 when it is white hot. The fine metal cobalt powder produced by the hydrogen reduction method can spontaneously ignite into cobalt oxide in the air. Cobalt is an important raw material for the production of heat-resistant alloys, hard alloys, anticorrosive alloys, magnetic alloys and various cobalt salts. High-speed steel twist drills are actually no different from cobalt-containing high-speed steel twist drills. The difference is that one has cobalt and one does not. Cobalt belongs to the higher-end materials of high-speed steel. For example, high-speed steels such as M35 and M42 are cobalt-containing. , And M2, 6542, 4241, 4341 below M35 are all high speed steel without cobalt.
隐藏域元素占位
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What are the main applications of diamond grinding wheels and their characteristics
Diamond grinding wheels are the hardest substance known, both natural and man-made. Subjects: mechanical engineering (first-level discipline); abrasives (second-level discipline); abrasives (third-level discipline) diamond is commonly known as "diamond diamond" It is a mineral composed of pure carbon II.
隐藏域元素占位