... W2,WAL1,WAL2 Purity : 99.95%min ISO9001:2000 Tungsten rods and barsTechnique: Forged Surface:polished standard:GB4187-84 material ... barrel of advanced automobile, ingredient of kinds of heat-resistent steel and electrode, mainly used to guns, artillery,rockets, ... the pole , wire drawing , or doing steel-making additive used for drawing tungsten wires, electrodes, heaters in high temperature vacuum ...