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　　Hard alloy (tungsten steel) is made up of refractory metal hard compounds and binding metal through powder metallurgy technology made of an alloy material.

Hard alloy (tungsten steel) with high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and a series of excellent properties, especially its high hardness and wear resistance, even under the temperature of 500 ℃ is basic remains the same, there are still very high hardness at 1000 ℃.

　　Carbide can be used to make the drilling tools and mining tools, drilling tools, measuring gage, wear-resistant parts, metal abrasive, cylinder liner, precision bearings, nozzle, hardware mold (such as wire drawing die, bolt moulds, nut moulds, as well as a variety of fastener moulds, hard alloy of good performance gradually replaced the previous steel mold).

　　High hardness (86 ~ 93 hra, equivalent to 69-81 HRC);

　　Good red hardness (up to 900 ~ 1000 ℃, 60 HRC);

　　Good abrasion resistance.

　　Carbide cutting tools 4 ~ 7 times higher than the high speed steel cutting speed and tool life high 5 ~ 80 times. Manufacture of moulds, measuring tool, 20 ~ 150 times higher than alloy tool steel. Can be hard material cutting around 50 HRC.

　　But carbide brittleness is big, cannot undertake machining, hard to make complex shape overall tool, so often made into different shapes of blades, the methods of welding, bonding, mechanical clamping installed on the blade or mold concrete use.

　　The preparation methods

　　(1) the production of powder. Powder production process including the production, powder powder mixed steps. To improve the formability of the powder and plasticity are usually add oil, rubber or paraffin plasticizer, etc.

　　(2) pressure molding. Powder in the 15-600 mpa pressure, pressure into the required shape.

　　(3) the sintering. In a protective atmosphere of high temperature furnace and vacuum furnace. Sintering is different from the metal melting, sintering at least one element is still in the solid state. Between the sintering process of powder particles by diffusion, recrystallization, welding, chemical combination, dissolution and so on a series of physical and chemical process, become a certain porosity of metallurgical products.

　　(4) post-processing. In general, good sintering parts can be used directly. But for some size requirements of high precision and has high hardness, wear resistance of sintered reprocessing parts. Post-processing including pressure, rolling, extrusion, surface quenching, quenching, oiled, and melt infiltration, etc.

　　Warmly welcome the customers friends to visit need to roll!

　　Ordering hotline: 0317-2675818 15933287588 15933287588

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