Fine structure silicon steel hearth roller sleeve and preparation method thereof

Abstract

The invention relates to a fine structure hearth roller sleeve and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps of: by taking 65-80 wt% coke powder and 20-35 wt% of intermediate temperature asphalt as raw materials, adding the intermediate temperature asphalt at 140-170 DEG C into the coke powder, after mixing and grinding, extruding to pug blocks, cooling, and grinding to blank powder with the particle size of less than 0.1 mm; pressing the blank powder into a fine structure silicon steel hearth roller sleeve green, thermally insulating at the reducing atmosphere at 750-1100 DEG C for 18-32 hours, burning to a sintering blank, digesting the sintering blank through the intermediate temperature asphalt, and thermally insulating at the reducing atmosphere at 1950-2400 DEG C for 8-48 hours so as to obtain a sintering blank; machining to a blank, carrying out antioxidant treatment, drying, and precisely machining to obtain the fine structure hearth roller sleeve lastly. The fine structure silicon steel hearth roller sleeve, provided by the invention, has the characteristics of fine inner structure, low porosity, no nodule and long service life, and capability of improving the production benefit of a silicon steel plate.

Description

Technical field [0001] The present invention is the technology field of roller sleeves at the bottom of the furnace.In particular, it involves a fine -structured silicon steel furnace bottom roller sleeve and its preparation method. Background technique [0002] Since the 1980s, the steel industry has developed a continuous annealing system to produce high -quality steel plates, which has generated demand for high -quality furnace bottom rollers, and this demand has increased with the development of the steel industry.Because the silicon steel sheet has special performance, the continuous annealing furnace producing silicon steel plates has more unique requirements for the bottom roller sleeve tube. At present, the tube used in the bottom roller of the silicon steel furnace is mostly carbon material sleeve. [0003] At present, at home and abroad (JP577137419A, JP57140377A, 1092324A, CN1117479, CN1994967, CN2199206), respectively disclosed the silicon steel furnace roller sleeve ...

AI Technical Summary

Problems solved by technology

However, many years of production and application show that there are also some outstanding problems: due to the large pores, the surface of the casing is noduled, and the nodules are easy to scratch the surface of the silicon steel plate, affecting the electromagnetic properties of the silicon steel plate and resulting in waste products; the wear resistance is not good. Well, after a period of use, the middle of the casing is worn and thinned to form a "dumbbell shape", which causes the silicon steel plate to deform and produce defective products; the oxidation resistance is not good, and it is gradually affected by the high temperature H in the furnace under the high temperature condition of heat treatment silicon steel Sub>2O gas is oxidized, making the surface of the carbonaceous hearth roller sleeve loose, pitting, reducing wear resistance, and shortening the service life. question

[0004] The applicant has authorized the invention patent technology of "C-Si-N silicon steel hearth roller casing and its preparation method" (CN101885615 A), although it is in use Good application results have been achieved, but the C-Si-N silicon steel hearth roller casing needs high-temperature nitriding reaction sintering, and the production technology is difficult