Gas-blowing upper nozzle and continuous casting method

Abstract

A gas-blowing upper nozzle that can prevent a gas leak and a continuous casting method using this nozzle. The gas-blowing upper nozzle includes a refractory including a gas-permeable material, and a metal case surrounding an outer circumference of the refractory, and has an upper-end metal case that extends inward from an upper end part of the metal case. An upper end of a sealing mortar part between the refractory and the metal case is covered by the upper-end metal case. In the continuous casting method, this gas-blowing upper nozzle is installed at the bottom of a tundish, and molten steel is poured from the tundish into a mold through the gas-blowing upper nozzle while an inert gas is blown into the gas-permeable material.

Dependencies are inferred from the claim text.