1.surface strengthening, 2. strengthen cold stamping, forging & pressing, bending, extrusion, stretching, die-casting ... life 1-3 times. Mainly for surface hardening, like cold stamping, forging & pressing, bending, extrusion, stretching, die-casting moulds ... be applied to hardening and repairing abrasion part of moulds, cutters and tongs. Characteristic of XKS-350 hardening machine:portable power, ...