Do you know High density tungsten alloy ball?

High density tungsten alloy ball (tungsten alloy) material is a kind of tungsten matrix (W content 85-99%), and added Ni, Cu, Co, Fe and other elements of the alloy.  According to the alloy composition characteristics and uses are divided into W-Ni-Fe, W-Ni-Cu, W-Co, W-WC-Cu, W-Ag and other main series, its density is as high as 16.5-19.0g /cm3, and is known as the high specific gravity alloy, it also has a series of excellent characteristics, than the major:  General proportion is 16.5-18.75g/cm3, 

high strength: tensile strength is 700-1000mpa, strong ray absorption ability: its ability is 30-40% higher than lead, large thermal conductivity: 5 times of die steel;  Small thermal expansion coefficient: only iron or steel 1/2-1/3, good conductivity;  Good weldability and machinability.