... before forging and stamping, extrusion [Application]It can be used for surface hardening of the following products:1. Surface hardening ... of gears, chain wheels, flywheels and gear rings.2. Surface hardening of spline shafts, bent axles, ... Quenching of rotors of plunger and rotor pumps, reversing shafts of valves, gears of gear pumps, and so on.8. Quenching of machine ...