Tungsten steel (carbide) has 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 ℃.
Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide and tantalum carbide are common components of tungsten steel. The grain size of carbide components (or phases) is usually between 0.2 and 10 microns. Carbide grains are bonded together by a metal binder, The binder is usually cobalt metal (Co). But for some special purposes, Nickel (Ni), iron (Fe), or other metals and alloys may also be used. For a combination of carbide and binder phases to be determined it is referred to as a "mark".
Tungsten steel is classified according to ISO standards. This classification is based on the material type of the workpiece (e.g. P,M,K,N,S,H). The main components of the bonding phase are strength and corrosion resistance. The tungsten steel matrix consists of two parts: one is the hardening phase; The other part is the bond metal. Bonding metals are generally iron group metals, commonly used are cobalt, nickel. Hence tungsten-cobalt alloys, tungsten-nickel alloys, and tungsten-titanium cobalt alloys.
Tungsten steel, such as high speed steel and hot die steels, The tungsten content in steel increases the hardness and heat resistance of steel remarkably, but the toughness decreases sharply. Tungsten are also the mainly apply to hard alloy, namely tungsten steel. Cemented carbide, known as the teeth of modern industry, tungsten steel products are widely used.