... by TUV 3)small order accepted Process availablesilica sol and sodium silicate (soluble glass)Material availablestainless steel, carbon steel, Alloy Steel, ... , quench+tempering, induction quenching, case hardening and Nitriding per material spec MachiningMachine the castings by CNC according to drawing spec ... pack the parts into plywood or iron case for transportation. silica sol casting steel flange