A method for compound centrifugal casting high-speed steel roll

Abstract

The invention relates to a method for composite centrifugal casting of high-chromium steel rolls, which is characterized in that a semi-steel intermediate transition layer is set between the high-chromium working layer and the ductile iron core, and the chemical composition weight of the semi-steel intermediate transition layer The percentages are: C 1.0~2.4%, Si 0.4~1.5%, Mn 0.4~1.5%, P 0~0.1%, S 0~0.03%, Cr 0~0.2%, Ni 1.0~2.0%, Mo 0~0.2% , and the rest is Fe. The beneficial effects of the invention are: the bonding strength between the high chromium working layer and the core nodular cast iron is improved, and the peeling of the bonding layer of the high chromium composite cast steel roll and the occurrence of roll breaking accidents are prevented.

Description

technical field [0001] The invention relates to the technical field of composite cast steel rolls, in particular to a method for composite centrifugally cast high-speed steel rolls. Background technique [0002] At present, the common problem in the method of composite casting high-speed steel rolls is that the bonding quality between the outer high-speed cast steel and the core ductile iron is difficult to guarantee. During composite casting, the working layer of the outer high-speed steel roll contains a large amount of chromium, molybdenum, Carbide forming elements such as vanadium and tungsten, while the core is ductile iron, the composition of these two materials is very different, the outer material containing a large amount of carbide forming elements must form a large amount of carbon with the core ductile iron Carbide exists in the bonded layer, which makes the bonded layer very low in strength, and it is easy to cause peeling accidents of the bonded layer of the ro...

AI Technical Summary

Problems solved by technology

[0002] At present, the common problem in the method of composite casting high-speed steel rolls is that the bonding quality between the outer high-speed cast steel and the core ductile iron is difficult to guarantee. During composite casting, the working layer of the outer high-speed steel roll contains a large amount of chromium, molybdenum, Carbide-forming elements such as vanadium and tungsten, and the core is ductile iron. The composition of these two materials is very different. The outer material containing a large amount of carbide-forming elements must form a large amount of carbon with the core ductile iron. Carbide exists in the bonded layer, which makes the bonded layer very low in strength, and it is easy to cause peeling accidents of the roll bonded layer during use; on the other hand, due to the diffusion of the high-speed steel content in the outer layer to the core, the problem of the reduction in the strength of the roll neck is difficult. solve

When composite casting high-speed steel rolls, when the outer layer solidifies and casts the core ductile iron molten iron, the cast core ductile iron molten iron will remelt part of the solidified outer high-speed cast steel, causing the high-speed content to diffuse to the core. Increase the core speed content and increase the whitening tendency of the core, so that more carbides will be precipitated and affect the overall strength of the roll, and roll breakage accidents will easily occur when the roll is used