... quenching, depth of quenching less than 1.2mm. Application: machine parts quenching, depth of quenching less than 1.2mm. minor ... inside bore quenching, iron,copper, aluminium ,metalwelding, cemented carbide thermal spraying and so on.Example : 1.Φ40X30 length 2m square bar ... , depth of quenching 1-1.2mm deflection little. 2. machine tool guideways dovetail groove quenching 3.Φ3mm drill bit heating ...