Grade: YD05 density :14.7 to 15.0 Flexural strength: 1350 Hardness: 92.0 Uses: suitable for heat-resistant steel, alloy steel, cast iron and normal wear parts production. Tungsten steel Application: contacts tungsten copper and copper surfaces rely on the joint surface of tungsten and copper into the mutual diffusion of two elements, a combination of very high intensity, copper tungsten arc erosion resistance as the face of the copper layer as base brazing surface or riveting face, truly two different composite materials.