The tungsten alloy counterweight is formed by adding elements such as Fe, Ni, Cu, Co, Mo and Cr into tungsten serving as the matrix (the content of W is 85 to 99 percent). Tungsten alloy called high density alloy because its density is up to 16.5 to 19.0g/cm3. It also has the characteristics of high specific gravity, high strength, strong ray absorption capability, high thermal conductivity, small thermal expansion coefficient, good electrical conductivity, and good weldability and machinability, wherein the specific gravity is usually 16.5 to 18.75g/cm3; the tensile strength is 700 to 1,000Mpa; the ray absorption capability is 30 to 40 percent higher than that of lead; the thermal conductivity is 5 times that of mould steel; and the thermal expansion coefficient is only one second to one third of that of Fe or steel. In view of its excellent functions, the high density alloy is widely applied to the industries of aerospace, aviation, war, oil drilling, electrical appliances and meters, medicine and so on.
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