Two-stage treating method for accretion in carbon jacket hearth roll of continuous annealing furnace

Abstract

The invention discloses a two-stage treating method for accretion in a carbon jacket hearth roll of a continuous annealing furnace. According to the invention, moisture inlets and hand-operated valve control switches are additionally installed at a second radiant tube heating zone and a second soaking zone, and when accretion occurs in the carbon jacket hearth roll, the hand-operated valve control switch is opened and moisture is directly blown in for roll grinding of the carbon jacket hearth roll. The method provided by the invention has the advantages of a simple and practical process, convenient operation and controlling and capacity of effectively controlling accretion in a carbon jacket of the hearth roll and realizing rapid on-line treatment of the accretion in the carbon jacket hearth roll; therefore, an operating rate of a unit and surface quality of products are improved, a life cycle of the carbon jacket hearth roll is prolonged, energy consumption is reduced, and the qualified rate of the products is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to an on-line treatment method for nodulation of carbon sleeve hearth rolls of a two-stage continuous annealing furnace for oriented silicon steel. Background technique [0002] The continuous annealing furnace for oriented silicon steel generally uses a two-stage horizontal continuous annealing furnace, and the two-stage horizontal continuous annealing furnace is provided with two radiant tube heating sections and two soaking sections. At present, most silicon steel sheet manufacturers use graphite carbon sleeves as the hearth rollers of continuous annealing furnaces. Carbon sleeve hearth rolls are prone to "nodules" when used for a long time in the high temperature environment in the continuous annealing furnace, which will cause defects such as bright marks, scratches and dents on the strip steel. [0003] The continuous annealing furnace for interme...

AI Technical Summary

Problems solved by technology

[0004] However, due to the high temperature and clean atmosphere of the furnace section controlled by the dry atmosphere, nodules are easily formed on the carbon sleeve hearth roll, which directly affects the surface quality of the strip steel.

At present, the treatment methods for the nodules of the carbon sleeve hearth rolls in various silicon steel production plants are to reduce the control temperature of each furnace section, and then adjust the relative speed of the furnace roll and the strip steel for grinding and repairing. The process is complicated and the treatment time is long. and difficult to control