... Applications: 1.EDM electrodes are made of carbide.Increase the surface of ferrous metal up to HV1100-1400 (HRC70-72 °). ... , and corrosion resistance, extend usage life 1-3 times. Mainly for surface hardening, like cold stamping, forging & pressing, bending, extrusion, stretching ... mould, rubber mould. 4.Dimension repair: the thickness of surface may increase by 20-60mm after hardening; therefore it can ...