Method for alleviation of nodulation degree of furnace roller and aftertreatment of nodules of furnace roller

Abstract

The invention relates to a method for alleviation of the nodulation degree of a furnace roller and aftertreatment of nodules of the furnace roller. The method is applicable to production of cold-rolled silicon steel and comprises the following steps: 1) strictly controlling the scale of a steel plate used as a hot rolling raw material; 2) controlling the heating temperature of a normalizing furnace; 3) controlling an oxidizing atmosphere; 4) controlling the temperature of a tapped steel plate; 5) controlling the sequence of production operations; 6) grinding the roller regularly; and 7) measuring the diameter of the furnace roller regularly and adjusting the number of revolution of the furnace roller which is changed in diameter after wearing. The method provided by the invention is optimized in process flow and process parameters, and different treatment measures are adopted according to the nodulation situation of the furnace roller, so the nodulation degree of the furnace roller canbe effectively alleviated, the rhythm of production is accelerated, the yield of cold rolled silicon steel is improved, and production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of cold-rolled silicon steel production, in particular to a method for alleviating the degree of nodulation of furnace rolls and post-treatment of furnace roll nodules. Background technique [0002] In iron and steel products, cold-rolled silicon steel is used as the iron core of various motors and transformers. It is an indispensable and important soft magnetic alloy in electric power, electronics and military industry. It is also an important energy-saving metal functional material and a high-tech that is urgently needed in China. Due to its complex production process and many control difficulties, its production can be used as a manifestation of the comprehensive strength of a country's steel production. [0003] The production of cold-rolled silicon steel requires heat treatment in a normalizing furnace to ensure uniform structure and stable performance. At the same time, descaling treatment is performed...

AI Technical Summary

Problems solved by technology

In actual production and operation, since the plate temperature of the cold-rolled silicon steel strip is about 1130°C, the part of the strip steel in contact with the furnace roll will adhere to the furnace roll to form nodules; after the furnace roll nodules form on the surface of the roller table Bumps, when the high-temperature steel plate passes, the pressure between the steel plate and the furnace roll is the largest at the bumps. In the early stage of production, the lower surface of the steel plate will appear due to the indentation of the nodulation bumps; if the production continues at high temperatures, it will Further aggravating the nodulation of the furnace roll will eventually cause the lower surface of the steel plate to tear and form pitting on the lower surface, commonly known as "nodule marks", which become a serious quality defect; this kind of defect cannot be eliminated in the rolling process, so it will cause a lot of waste

[0004] In the current conventional production process, roller grinding is often used for furnace roller nodulation treatment, that is, for the defective furnace rollers that have been off the production line, use the cooling gap to go online again for shot blasting and pickling when the production is over, which not only delays the production rhythm, and increased production costs