Method for producing melt supply pipe for aluminum die casting

A method for producing a melt supply pipe, composed of an inner ceramic pipe and an outer steel pipe fitted to the inner pipe, for connecting a melting furnace and a plunger sleeve of a die casting machine, comprising the steps of:

• forming a Ni alloy layer over the inner circumferential surface of the outer steel pipe;
• burying the outer pipe with the Ni alloy layer in TiC powder, and heating the pipe and the powder under vacuum in a vacuum heating oven to a temperature at which a liquid phase is generated from the Ni alloy, thereby bonding the TiC particles to the surface of the Ni alloy layer;
• and
• fitting the inner ceramic pipe into the outer pipe with the TiC particles bonded to the inner circumferential surface, thereby assembling the melt supply pipe.