Mandrel for continuous casting of hollow ingots

摘要

A downwardly tapered section of a mandrel is given a coating of a metal whose coefficient of thermal conductivity is lower than that of the metal from which the mandrel is manufactured. The thickness of the coating diminishes uniformly downwardly along the length of the tapered section the mandrel in the direction of motion of a downwardly conveyed ingot, the ratio of the thickness of the coating at the upper end of the tapered section relative to the thickness of the coating at the lower end thereof ranging from 1:50 to 1:150.