Commonly used cemented carbides are classified into three categories according to their composition and performance characteristics: tungsten and cobalt, tungsten, titanium and cobalt, and tungsten-titanium-niobium (tantalum). Tungsten-cobalt and tungsten-titanium-cobalt carbides are widely used in production.

(1) Tungsten cobalt type hard alloy

The main components are tungsten carbide (WC) and cobalt, and the grades are coded by the code number YG ("hard" and "cobalt"). For example, YG6 is a tungsten cobalt alloy with a cobalt content of 6%. The tungsten carbide content is 94%.

(2) Tungsten Titanium Cobalt Carbide

The main components are tungsten carbide (WC), titanium carbide (TiC) and cobalt, and the grades are coded with the code YT ("hard" and "titanium" are the Chinese Pinyin prefixes) and the percentage of titanium carbide is added. For example, YT15 represents tungsten-titanium-cobalt-based hard alloy with a titanium carbide content of 15%.

(3) Tungsten-titanium-antimony-tellurium alloys

This kind of hard alloy is also called general-purpose hard alloy or universal hard alloy. The main component is tungsten carbide (WC), titanium carbide (TiC), tantalum carbide (TaC), or niobium carbide (NbC) and cobalt. Grades are coded with the code number YW ("hard" and "million" words in Pinyin).

Application of cemented carbide

(1) Tool Material

Carbide is used as the largest number of tool materials and can be used to make turning tools, milling cutters, planers, and drills. Among them, tungsten cobalt alloys are suitable for short-cut processing of ferrous metals and non-ferrous metals, and processing of non-metallic materials such as cast iron, cast brass, and bakelite; tungsten-titanium-cobalt-based hard alloys are suitable for use in steels such as ferrous metals. Chip processing. In the same type of alloy, cobalt content is more suitable for rough processing, and cobalt content is less suitable for finishing. General-purpose hard alloys have a much longer service life for hard-to-machine materials such as stainless steel than other hard alloys.

(2) mold material

Cemented carbide is mainly used as a cold die, a cold die, a cold die, and a cold die.

Carbide cold heading die under wear-resistant working conditions under the impact or strong impact, the commonality is that the hard alloy has good impact toughness, fracture toughness, fatigue strength, bending strength and good wear resistance. Usually medium and high cobalt and medium and coarse grain alloy grades are commonly used, such as YG15C.

In general, the relationship between wear resistance and toughness of cemented carbide is contradictory: the improvement of the wear resistance will lead to a decrease in toughness, and the increase in toughness will inevitably lead to a decrease in wear resistance. Therefore, in the selection of alloy grades, it is necessary to meet specific application requirements according to the processing object and processing working conditions.

If the selected grade is easy to cause early cracking and damage during use, it is better to use a brand with higher toughness; if the selected grade is prone to early wear and damage during use, it is better to use a grade with higher hardness and better wear resistance. . The following grades: YG6C, YG8C, YG15C, YG18C, YG20C from left to right, hardness decreases, wear resistance decreases, toughness increases; otherwise, the opposite.

(3) Measuring Tools and Wear Parts

Carbide alloys are used in wear-resistant surface mounts and parts, grinder precision bearings, centerless grinder guides and guide bars, lathe tips and other wear parts.