... low amounts of Ni,Fe ,Cu,Co,Mo,Cr etc(less then 15%). Luoyang achemetal Co., Ltd produce Tungsten Heavy Alloys with density ... heavy alloys are generally refractory metal, which have two-phase composites consisting of W-Ni- Fe or W-Ni- Cu or ... W-Ni-Cu-Fe, some tungsten alloy is added with Co,Mo,Cr, etc. They have very high melting point and ...