Reinforced chilled roll and preparation method thereof

Abstract

The invention discloses a reinforced chilled roll. The reinforced chilled roll comprises an outer alloy layer and a core portion, and a medium layer is arranged between the outer alloy layer and the core portion. By the aid of the medium layer arranged between the outer alloy layer and the core portion, combination instability of an original outer alloy layer and the core portion is improved. In addition, graphite form and number of the alloy outer layer can be obtained and improved in the ideal form by means of adding a preliminary inoculation processing procedure and a microalloying processing procedure to a casting process and controlling nodulizer explosion time. Besides, the performance of the reinforced chilled roll is improved by means of refined crystalline strengthening and strain strengthening of microalloy beneficial elements, quality problems of slag dropping and small spalling are avoided, and steel passing quantity is increased obviously.

Description

technical field [0001] The invention belongs to the technical field of steel rolling rolls, and in particular relates to a reinforced chilled roll and a preparation method thereof. Background technique [0002] The CCAIC material rolls in the current roll industry are widely used because of their high hardness and good wear resistance, and are quite popular with users. However, due to the problems of the base material, there are the following deficiencies: [0003] 1. The strength of the material matrix has not been improved by micro-alloying, and the hardness cannot be higher, otherwise the quality problems of block dropping and chipping will often occur; [0004] 2. The shape of carbides in the material is not very ideal, the rolling stress buffer energy storage is not ideal, the fatigue cracks expand rapidly, and the amount of grinding each time is too large; [0005] 3. The metallurgy combined with ultrasonic flaw detection of the alloy outer layer and the core often h...

AI Technical Summary

Problems solved by technology

[0003] 1. The strength of the material matrix has not been improved by micro-alloying, and the hardness cannot be higher, otherwise the quality problems of block dropping and chipping will often occur;

[0004] 2. The shape of carbides in the material is not very ideal, the rolling stress buffer energy storage is not ideal, the fatigue cracks expand rapidly, and the amount of grinding each time is too large;

[0005] 3. The metallurgy combined with ultrasonic flaw detection of the alloy outer layer and the core often has over-limit defects, and the scrap rate is about 6.9%;

[0006] 4. When the product is used and grinded close to the scrapped diameter, it is easy to cause quality problems such as peeling and falling off, resulting in rolling accidents