inner pipe 10 outer pipe 12 integral structure of the melt supply pipe is obtained by fitting the outer pipe 12 to the inner pipe 10 as shown in fig2 which is an enlarged view of the portion a of fig1 the entire inner circumferential surface of the outer steel pipe 12 is coated with a ni alloy layer 13 and the surface of the ni alloy layer 13 is covered with a myriad of titanium carbide tic particles the tic particles 14 are bonded in a particulate state to the ni alloy layer 13 such that they partly protrude from the surface of the ni alloy layer 13 preferably the gaps in the tic particles are filled in with fine ceramic particles 15 comprising at least one of boron nitride bn alumina al 2 o 3 zirconia zro 2 and silicon nitride si 3 n 4 as shown in fig3 the fine ceramic particles 15 can improve the melting loss resistance of the base ni alloy layer 13 to which the tic particles 14 are bonded according to the melt supply pipe of this embodiment which employs the combination of the inner ceramic pipe 10 and the outer steel pipe 12 the outer steel pipe 12 can protect the inner ceramic pipe 10 from external mechanical impact and in addition enables application of a sufficient clamp load on the terminal connecting portions of the melt supply pipe thereby preventing leakage of a molten aluminum alloy furthermore the tic particles 14 are bonded to the ni alloy layer 13 formed over the inner circumferential surface of the outer steel pipe 12 the tic particles 14 have the property of repelling a molten aluminum alloy by.