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cemented carbide ring
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High Quality Tungsten Carbide Products Made in China   1,Made of tungsten carbide

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3,Competitive price

Tungsten carbide (chemical formula: WC) is an inorganic chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes for use in industrial machinery, cutting tools,abrasives, armor-piercing rounds, other tools and instruments, and jewelry.

Tungsten carbide is approximately two times stiffer than steel, with a Young's modulus of approximately 550 GPa,[2] and is much denser than steel or titanium. It is comparable with corundum (α-Al2O3) orsapphire/ruby in hardness and can only be polished and finished with abrasives of superior hardness such as cubic boron nitride and diamond, in the form of powder, wheels, and compounds.


Historically referred to as Wolfram Wolf Rahm, wolframite ore discovered by Peter Woulfe was then later carburized and cemented with a binder creating a composite now called "Cemented Tungsten Carbide".[3]

Colloquially among workers in various industries (such as machining and carpentry), tungsten carbide is often simply called carbide (without precise distinction from other carbides) despite the inaccuracy of the usage. Among the lay public, the growing popularity of tungsten carbide rings has led to some consumers calling the material justtungsten, despite the inaccuracy of the usage.

There are two well characterized compounds of tungsten and carbon, WC and tungsten semicarbide, W2C. Both compounds may be present in coatings and the proportions can depend on the coating method.[7]

At high temperatures WC decomposes to tungsten and carbon and this can occur during high-temperature thermal spray, e.g., in high velocity oxygen fuel (HVOF) and high energy plasma (HEP) methods.[8]

Oxidation of WC starts at 500–600 °C (932-1112˚F).[4] It is resistant to acids and is only attacked by hydrofluoric acid/nitric acid (HF/HNO3) mixtures above room temperature.[4] It reacts with fluorine gas at room temperature and chlorine above 400 °C (752 °F) and is unreactive to dry H2 up to its melting point.[4]WC dissolves readily in dilutedhydrogen peroxide.[9]

There are two forms of WC, a hexagonal form, α-WC (hP2, space group P6m2, No. 187),[1][19]and a cubic high-temperature form, β-WC, which has the rock salt structure.[20] The hexagonal form can be visualized as made up of a simple hexagonal lattice of metal atoms of layers lying directly over one another (i.e. not close packed), with carbon atoms filling half the interstices giving both tungsten and carbon a regular trigonal prismatic, 6 coordination.[19] From the unit cell dimensions[21] the following bond lengths can be determined; the distance between the tungsten atoms in a hexagonally packed layer is 291 pm, the shortest distance between tungsten atoms in adjoining layers is 284 pm, and the tungsten carbon bond length is 220 pm. The tungsten-carbon bond length is therefore comparable to the single bond in W(CH3)6 (218 pm) in which there is strongly distorted trigonal prismatic coordination of tungsten.[22]

Molecular WC has been investigated and this gas phase species has a bond length of 171 pm for 184W12C.[23]