A kind of refractory material for the end cover of centrifugal large bar roll and the manufacturing method of the end cover

Abstract

The invention provides a refractory material for a large centrifugal bar roll end cover and a manufacturing method of the end cover containing the refractory material. The refractory material is prepared from components in percentage by mass as follows: 25%-35% of bauxite, 8%-10% of zircon powder, 12%-15% of high-alumina cement, 35%-45% of silica powder and 5%-10% of water, wherein the bauxite comprises components in percentage as follows: 10%-15% of bauxite with the granularity being 3-8 mm and 15%-25% of bauxite with the granularity being 1-3 mm. The refractory material for the roll end cover has the characteristics of high strength and refractoriness, has good adhesion force with the end cover and cannot easily fall off when a large centrifugal bar roll is poured, the end cover cannot be damaged, molten iron cannot leak out, the problem of slag inclusion in the roll compositing area is effectively solved, and the production safety and the product quality are well guaranteed.

Description

technical field [0001] The invention belongs to the technical field of centrifugal rolls, and in particular relates to a refractory material for an end cover of a centrifugal large bar roll and a method for manufacturing the end cover. Background technique [0002] Roll is an important metallurgical equipment in steel rolling production, and it is also one of the main consumption equipment. The consumption of roll is about 5-15% of the production cost of steel rolling. In order to improve the quality of rolls and reduce the production cost of rolls, existing domestic and foreign roll companies generally adopt centrifugal casting to produce rolls. The quality of the roll is not only related to the production cost of steel rolling and the production efficiency of the rolling mill, but also affects the quality of the rolled material to a large extent. With the continuous development of roll production technology, the wear resistance, strength and toughness of existing rolls ha...

AI Technical Summary

Problems solved by technology

However, this kind of refractory cement layer has the defects of poor strength and low refractoriness. During the production process of centrifugal large bar rolls, the temperature of the molten metal generally reaches a high temperature above 1200°C. The high-speed rotation under the ground makes the refractory cement layer prone to wear and thermal fatigue, the high temperature resistance strength and thermal shock resistance are not enough, and the adhesion between the refractory cement layer and the end cover is not enough, the refractory cement layer is easily impacted by the high temperature molten metal After falling off, the end cover molding sand is easily damaged, and the internal molten metal is easy to overflow, causing safety hazards, and causing the problem of slag inclusion in the roll composite area