Silicon steel hearth roll sleeve and preparation method thereof

Abstract

The invention relates to a silicon steel hearth roll sleeve and a preparation method thereof. The technical scheme of the method comprises the following steps of: mixing 2 to 10 weight percent of large particles of a dense carbon raw material, 2 to 10 weight percent of small particles of the dense carbon raw material, 80 to 95 weight percent of fine powder of the dense carbon raw material, and 0.3 to 2.0 weight percent of Si micro-powder, as well as 5 to 15 weight percent of phenolic resin based on the total amount of the raw materials; pressing the mixture into a blank of the silicon steel hearth roll sleeve after mixing and rolling, preserving the heat for 4 to 8 hours at the temperature of between 180 and 220 DEG C, placing the blank in a pressure vessel, maintaining the state for 15 to 30 minutes at the vacuum degree of between 10,000 and 20,000Pa, injecting liquid-state phenolic resin into the pressure vessel, pumping air until the vacuum degree is between 10,000 and 20,000Pa, and maintaining the state for 15 to 30 minutes; and finally, preserving the heat for 8 to 12 hours at the high temperature of between 1,950 and 2,150 DEG C, and machining the blank until the surface roughness is less than or equal to 12.5. The method has the advantages of simple process and low energy consumption; and the prepared product has the characteristics of high oxidation resistance, high strength, high abrasion resistance, low porosity, no nodule and capability of improving the quality of the silicon steel plate.

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 silicon steel hearth roller casing and a preparation method thereof. Background technique [0002] Since the 1980s, the iron and steel industry has developed a continuous annealing system to produce high-quality steel plates, and the carbonaceous hearth roll sleeves used in the continuous annealing furnace for the production of silicon steel plates play a key role. Due to the special properties of silicon steel sheets, there are very unique performance requirements for hearth roll sleeves. Therefore, the production process of hearth roll sleeves is very complicated, with long cycle times and high energy consumption. As described in patents JP57137419A, JP57140377A, 1092324A, CN1117479, CN1994967, and CN2199206, the silicon steel hearth roller sleeve and its preparation and surface ...

AI Technical Summary

Problems solved by technology

Due to the special properties of silicon steel sheets, there are very unique performance requirements for hearth roll sleeves. Therefore, the production process of hearth roll sleeves is very complicated, not only long in cycle but also high in energy consumption.

As described in patents JP57137419A, JP57140377A, 1092324A, CN1117479, CN1994967, and CN2199206, the silicon steel hearth roller sleeve and its preparation and surface treatment methods all go through batching, compression molding, roasting, vacuum infiltration, ultra-high temperature firing, and mechanical processing. Silicon steel hearth roller sleeves are prepared by other processes, the production process is complicated, the cycle is long, and the energy consumption is high