Hard alloy is a kind of or several refractory carbide (tungsten carbide, titanium carbide, etc.) powder as the main component, adding as an adhesive metal powder (cobalt, nickel, etc.), by powder metallurgy method and made of alloy. It is mainly used in the manufacture of high-speed cutting tools and hard and tough material cutting tools, as well as the production of cold work die, measuring tools and high [SCALE STEEL]wear-resistant parts that are not affected by impact and vibration. The hardness, wear resistance and red hardness of high cemented carbides at room temperature hardness up to 86 ~ 93HRA, equivalent to 69 ~ 81HRC. It can maintain high hardness at 900 ~ 1000℃ and has excellent wear resistance. Compared with high speed tool steels, the cutting speed can be 4 ~ 7 times higher, the life can be 5 ~ 80 times longer, and the hardness can be cut up to 50HRC hard materials.
When manufacturing cemented carbide, the raw material powder particle size is between 1 to 2 microns, and the purity is very high. Raw materials according to the provisions of the composition of the proportion of the ingredients, add alcohol or other media in the wet ball mill wet grinding, so that they are fully mixed, crushed, after drying and screening to add wax or glue and other forming agents, and then [SCALE STEEL]after drying, sieving the mixture. Then, the mixture is granulated, pressed, heated to close to the melting point of the bonding metal (1300 ~ 1500℃), the hardening phase and the bonding metal will form eutectic alloy.
Cemented carbide is also long used in the production of cold drawing die, cold punching die, cold extrusion die, cold pier die and other cold [SCALE STEEL]die. Moulds made of cemented carbide can better withstand impact and have better impact toughness, fracture toughness, fatigue strength, bending strength and wear resistance. Usually, the cemented carbides used in the production of molds are medium and high cobalt and medium and coarse grain grades, such as YG15C, etc.
Cemented carbide has good corrosion resistance, oxidation resistance and high temperature resistance. Cutting tools made of [SCALE STEEL]cemented carbide usually have good resistance to corrosion caused by atmosphere, acid, alkali, etc., are not prone to oxidation, and can remain hard at temperatures of 900 to 1000 degrees.
The linear expansion coefficient of [SCALE STEEL]cemented carbide is very small, which leads to its stable shape and size during machining.
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