High-temperature quick heat treatment furnace bottom roller nodule removing method

Abstract

The invention provides a high-temperature quick heat treatment furnace bottom roller nodule removing method. According to the method, through the reasonable furnace wading system, temperature rising and lowering in the production process are not needed, a steel plate for furnace wading moves back and forth in a furnace, a furnace bottom roller rubs against the steel plate for furnace wading, the temperature of the surface of the furnace bottom roller is lowered, part of nodules can be disengaged by means of the difference between the nodule expansion coefficient and the furnace bottom roller expansion coefficient, and the furnace bottom roller nodules are quickly removed; and the influence on production efficiency and cost wasting which are caused by nodule treatment are effectively reduced. Compared with traditional methods, the high-temperature quick heat treatment furnace bottom roller nodule removing method has the characteristics that the treatment time is short, operation is easyand convenient, and additional equipment is not needed. The production efficiency is improved, wasted energy sources are deceased, and the surface quality of the steel plate is effectively improved.

Description

Technical field [0001] The invention relates to the technical field of wide and thick plate heat treatment furnaces, in particular to a method for quickly removing nodules on the bottom rollers of a heat treatment furnace at high temperature. Background technique [0002] Roller hearth heat treatment furnace is used for normalizing, quenching and tempering heat treatment of steel plate, steel pipe, section steel and wire rod. The roller hearth heat treatment furnace has good heat treatment quality, high output, high degree of mechanization and automation, and its application in heat treatment is increasing. [0003] In actual production, major domestic steel mills all have the problem of indentation on the lower surface of the steel plate caused by nodulation of the bottom roller of the heat treatment furnace. Research has found that the main reasons that cause the roller nodules in the roller hearth heat treatment furnace are as follows: (1) The lower surface of the steel plate i...

AI Technical Summary

Problems solved by technology

After research, it is found that the main reasons for the nodulation of the roller hearth heat treatment furnace roller are as follows: (1) The shot blasting on the lower surface of the steel plate is not thorough, and the iron oxide scale in the rolling process is not effectively removed, resulting in the iron oxide scale in the furnace. nodules

(2) After shot blasting, the shot material and metal dust adhere to the bottom surface of the steel plate and are brought into the furnace, resulting in oxidation and nodules

(3) The furnace door leaks from the furnace door frame, and water vapor enters the furnace, causing the steel plate to oxidize and nodulate

This method requires a specially processed support plate, which is costly and requires about 8 hours of support, which takes a long time and has a great impact on production efficiency

CN102914174A discloses a treatment method for preventing hearth rolls from forming nodules in a heat treatment furnace. In this method, the front and rear furnace doors are opened at a high temperature of 800°C, and the furnace bottom rolls are formed by repeated movements in the furnace using thick-sized support plates. Rolled into thin sheets and pasted on the furnace roller, this method will lead to more and more nodules with the continuous increase of oxide scale until it fails

CN101968320A discloses a method for removing nodules on the hearth rolls of a heat treatment furnace. The method uses the friction between the support plate and the hearth rolls at a temperature of 500°C to remove nodules. However, the method is complicated to operate and requires auxiliary equipment such as hoists. higher cost