High-carbon high-vanadium powder high-speed steel composite roll collar and manufacturing method thereof

Abstract

The invention discloses a high-carbon high-vanadium powder high-speed steel composite roll collar. The high-carbon high-vanadium powder high-speed steel composite roll collar comprises an inner-layersteel pipe (1) and outer-layer powder high-speed steel (2), wherein the inner-layer steel pipe (1) is a prefabricated cylindrical inner steel pipe, and the outer-layer powder high-speed steel (2) is acylindrical high-speed steel pipe which wraps the periphery of the inner-layer steel pipe (1) through a hot isostatic pressing method; and the ratio of the thickness of the inner-layer steel pipe (1)to the thickness of the outer-layer powder high-speed steel (2) is 1: (0.6-1.5). The high-carbon high-vanadium powder high-speed steel composite roll collar has high wear resistance, good red hardness and high compressive strength of powder metallurgy high-speed steel, and the manufacturing cost can be effectively reduced. The invention further discloses a manufacturing method of the high-carbonhigh-vanadium powder high-speed steel composite roll collar.

Description

technical field [0001] The invention relates to the technical field of metal materials and metallurgical rolls, in particular to a high-carbon and high-vanadium powder high-speed steel composite roll ring and a method for manufacturing the high-carbon and high-vanadium powder high-speed steel composite roll ring. Background technique [0002] The roll is a commonly used equipment part in the metallurgical and mechanical processing industries, and it is also an industrial material that is easily consumed. Compared with the traditional roll rings of other materials, the cemented carbide roll ring has high hardness, high compressive strength, Good wear resistance, good corrosion resistance, small friction coefficient, low thermal conductivity, long service life, high precision and good quality of rolled products, etc. It is often used in high-speed wire rolling, but at the same time, the weight of cemented carbide roll ring is large , difficult processing, high scrap rate, larg...

AI Technical Summary

Problems solved by technology

[0002] The roll is a commonly used equipment part in the metallurgical and mechanical processing industries, and it is also an industrial material that is easily consumed. Compared with the traditional roll rings of other materials, the cemented carbide roll ring has high hardness, high compressive strength, Good wear resistance, good corrosion resistance, small friction coefficient, low thermal conductivity, long service life, high precision and good quality of rolled products, etc. It is often used in high-speed wire rolling, but at the same time, the weight of cemented carbide roll ring is large , difficult processing, high scrap rate, large waste of alloy resources, high price, poor impact and shock resistance, under the influence of high-speed rolling speed, rolling pressure and thermal shock load, it is easy to generate cracks and expand rapidly, resulting in Surface flaking and roll crushing occurs

[0003] At present, high-speed steel rolls and high-speed steel roll rings / roll sleeves mostly adopt the process of centrifugal casting roll body and core casting roll shaft, which mainly has the following disadvantages: ① When the boron content in the outer layer of the roll is high, borides formed with other elements There is a density difference with the iron matrix. During centrifugal casting, due to the centrifugal force, high-density borides and carbides will segregate to the surface of the roll; ②The interface between the inner and outer layers is poorly bonded; ③Alloy elements in the outer layer are easy to diffuse to the core to form a large amount of The carbides in the core will increase the brittleness of the core ductile iron material and reduce the impact resistance, and roll breakage accidents are prone to occur during the rolling process; ④The overall quenching process is adopted, the hardness gradient is large, the heat treatment cycle is long, and the cost is high; ⑤The outer layer is high-speed After the steel material is worn out, the roller core can only be recycled by remelting, resulting in waste of materials and energy

[0005] Compared with traditional casting high-speed steel, powder metallurgy high-speed steel still has the characteristics of high raw material price and complicated process, so it has not been widely used in the field of roll technology

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