Gas injection nozzle refractory and gas injection nozzle
AssigneesJfe Steel Corporation, Shinagawa Refractories Co., Ltd.
InventorsSeiji Hosohara, Atsuhisa Iida, Atsushi Torigoe, Ryoma Fujiyoshi
Life of this patent
Estimating the term…
Abstract
A gas injection nozzle refractory with one or more gas injection small metal tubes buried therein has improved durability. The gas injection nozzle refractory includes a MgO—C central refractory with a small metal tube buried therein, and a MgO—C peripheral refractory surrounding the central refractory. The central refractory on a plane of the gas injection nozzle refractory has an external shape of a circle with a radius in the range of R+10 to R+150 mm concentric with a virtual circle with a minimum radius surrounding all buried small metal tubes, R mm being a radius of the virtual circle.
Claims12
A gas injection nozzle refractory with at least one gas injection small metal tube buried in a carbon-containing refractory, the gas injection nozzle refractory comprising:
- a central refractory with the at least one small metal tube buried therein, the central refractory being a MgO—C refractory with a carbon content in the range of 40% to 80% by mass, a metal Al content in the range of 3% to 8% by mass, and a mass ratio of a metal Si content to the metal Al content in the range of 0.30 to 1.0, and
- a peripheral refractory surrounding the central refractory, the peripheral refractory being a MgO—C refractory with a carbon content in the range of 10% to 25% by mass,
- wherein the central refractory on a plane of the gas injection nozzle refractory has an external shape of a circle with a radius in the range of R+10 to R+150 mm concentric with a virtual circle with a minimum radius surrounding the at least one buried small metal tube, R mm being a radius of the virtual circle.
Dependencies are inferred from the claim text.