Anti-corrosion method for oxygen lance nozzle and oxygen lance nozzle

Abstract

The invention discloses an anti-corrosion method for oxygen lance nozzles and an oxygen lance nozzle, belonging to the technical field of steel smelting in a converter. According to the invention, the technology of extrusion molding is employed, which enables crystal grains at a nozzle head face to arrange more compactly and enables the nozzle head face to have enhanced capacity of resisting erosion and immersion by slag and molten steel; an alloy heat insulation material is sprayed on the nozzle head face to form a thermal insulation layer, thereby enhancing heat insulation and radiation insulation functions of the nozzle head face, avoiding binding of copper and steel at a high temperature and enabling the oxygen lance nozzle to have better high temperature resistance performance. Therefore, the method provided in the invention enables the service life of the oxygen lance nozzle to be substantially prolonged and production cost to be reduced.

Description

technical field [0001] The invention relates to an oxygen lance nozzle for converter steelmaking and an anti-corrosion method for the oxygen lance nozzle. Background technique [0002] Oxygen in converter steelmaking is supplied to the converter molten pool through the oxygen lance nozzle with complex shape for smelting operation. The oxygen lance nozzle with reasonable structure can obtain the best smelting operation, easy to slag, and the blowing process is stable, reducing splashing, metal The yield is high, and the utilization rate of oxygen is improved. As the key component of the oxygen lance, the nozzle is made of copper with good thermal conductivity through forging or casting. The working environment of the nozzle is extremely harsh, and the temperature of the reaction zone formed after the oxygen flow is sprayed is as high as about 2000 degrees, and the nozzle is easily damaged in this environment. The reasons for nozzle damage are as follows: (1) Scouring and ra...

AI Technical Summary

Problems solved by technology

The nozzle is scoured and soaked by the high temperature and continuous splashing of molten slag and molten steel, and gradually melts and becomes thinner; due to the frequent rapid cooling and heating of the temperature, cracks occur at the end of the nozzle, and the cracks gradually expand with the continuation of use time. Until the end seeps water or even leaks and scraps; (2) Poor cooling

The crystal grains on the surface of the nozzle are heated and grow up. After the damage, the grains in the center of the nozzle grow 5 to 10 times compared with the new nozzle. Due to the growth of the grains, the nozzle hole is deformed and the performance of the oxygen jet is deteriorated.

(3) The end face of the nozzle is glued to steel

However, to add a protective cover on the end face, because the material for making the protective cover has not been determined, the operability of this technology is not strong at present; and the forging-casting combination technology is to cast the copper material into a certain shape, and then perform multiple forgings under heating. Processing can improve the crystallinity and density of copper, but the metal material will produce fatigue phenomena such as cracks and fractures under the action of multiple alternating stress loads. This technology cannot fundamentally solve the problem of easy damage to the nozzle.

Images