The practical difficulties encountered in the manufacture of high-nickel alloys have been enumerated.Some properties of the core sand , facing and backing sands used for moulding have been given. Suitable fluxes are mentioned, but only the proprietary flux acted as a degassing agent and for deoxidation. It has been noticed that despite
adoption of all precautions, porosity could not be
entirely eliminated. Author has invited remedial
suggestions to solve difficulties