... certification:ISO 2000 weight:0.1-50kg Precision casting ofSpecification1, investment casting ,precision casting2, carbon steel / alloy steel ... Flush grind6, Heat treatmentHeat treat are used to control hardness ,mechanical properties ,corrosion resistance ,and surface ... wax Assemblies –Best for certain configurations ,but tolerance control suffers4) Soluble Cores :Requires additional die and labor5 ...