Commonly used cemented carbide with WC as the tension factor, according to whether to participate in other carbides and is divided into the following three categories:
(1) Tungsten-cobalt (WC+Co) Cemented Carbide (YG) "As long as processing pig iron" It consists of WC and Co, with high bending strength, toughness, good thermal conductivity, but poor heat resistance and wear resistance, and is used for processing cast iron and non-ferrous metals. Fine grain YG type cemented carbide (such as YG3X, YG6X), in the cobalt content Ray at the same time, its hardness and abrasion resistance is higher than YG3, YG6, strength and toughness is a little poorer, is practical for processing hard cast iron, austenitic stainless steel, heat-resistant alloys, hard bronze and so on.
(2) tungsten, titanium and cobalt (WC + TiC + Co) cemented carbide (YT) "intense processing of cooked iron" Due to the hardness and melting point of TiC than WC are higher than YG, compared with its hardness, wear resistance, red hardness increase, bonding temperature is high, oxidation resistance is strong, and at high temperatures will generate TiO 2, can be eliminated bonding. But the thermal conductivity is poor, low flexural strength, so it is practical for processing steel and other tough materials.
(3) tungsten, titanium, tantalum and cobalt (WC + TiC + TaC + Co)) Cemented Carbide (YW YS) "intense processing of heat-resistant steel, high manganese steel, stainless steel and other difficult to process materials".
TaC(NbC) is added on the basis of YT type of cemented carbide, which improves the bending strength, striking toughness, high temperature hardness, oxygen resistance and wear resistance. It can process steel, cast iron and non-ferrous metals. Therefore, it is often called general-purpose cemented carbide.
