Durable silicon steel furnace bottom roller sleeve and preparation method thereof

Abstract

The invention relates to a silicon steel furnace bottom roller sleeve and a preparation method thereof. The technical scheme of the invention is as follows: 2-10wt% of dense carbon material large particles, 2-10wt% of dense carbon material small particles, 80-95wt% of dense carbon material fine powder and 0.3-2.0wt% of Si micro powder are mixed together and are then ground for 20 to 30 minutes with the addition of 8-20wt% of bonding agent of the above materials; a silicon steel furnace bottom roller sleeve blank is manufactured after the mixed grinding and is baked for 4 to 8 hours after heat preservation under the temperature of 1,400 to 1,450 DEG C; then the silicon steel furnace bottom roller sleeve blank is placed in a pressure vessel and is maintained for 15 to 30 minutes under the pressure of 10,000 to 20,000Pa, tar is filled until the sleeve blank is completely soaked, and then the sleeve blank is pumped to the vacuum degree of 10,000 to 20,000Pa and is maintained for 15 to 30 minutes; finally, the sleeve blank is heat-preserved for 8 to 12 hours under the high temperature of 1,950 to 2,150 DEG C and is processed by machinery until the surface roughness is smaller than or equal to 12.5. The durable silicon steel furnace bottom roller sleeve has the characteristics of long service life, good oxidation resisting performance, high strength, good wear-resisting property, low porosity, no accretion and high quality of silicon steel plates.

Description

technical field [0001] The invention belongs to the technical field of preparing high-temperature-resistant metallurgical materials from carbonaceous raw materials. In particular, it relates to a durable silicon steel hearth roller casing and a preparation method thereof. Background technique [0002] Since the 1980s, the steel industry has developed a continuous annealing system to produce high-quality steel plates, which has created a demand for high-quality hearth rolls, and this demand has grown with the development of the steel industry. Due to the special properties of silicon steel sheets, the continuous annealing furnace for producing silicon steel plates has more unique requirements for the hearth roll sleeves. At present, the sleeves used for silicon steel hearth rolls are carbonaceous material sleeves. [0003] Patents JP57137419A, JP57140377A, 1092324A, CN1117479, CN1994967, and CN2199206 respectively describe silicon steel hearth roller sleeves and their prepar...

AI Technical Summary

Problems solved by technology

However, after years of production and application, it has been shown that there are also some outstanding problems, mainly as follows: surface nodules occur during use, scratch the surface of the silicon steel plate, affect the electrical properties of the silicon steel plate and cause waste products; poor wear resistance Well, after a period of use, the middle of the casing is worn and thinned to form a "dumbbell shape", causing deformation and defective products; the oxidation resistance is not good, and it is gradually destroyed by the high temperature H in the furnace under the high temperature conditions of heat treatment silicon steel. 2 Oxidation by O gas makes the surface of the carbonaceous hearth roller casing loose and pitted, reduces wear resistance, and shortens the service life. At the same time, problems such as aggravating nodules and affecting the quality of silicon steel plates will also occur.