Compound high speed steel roll and its making process

Abstract

The present invention discloses compound high speed steel roll and its making process. The compound high speed steel roll consists of roll body and roll core compounded through central casting. The roll body is made of high speed steel comprising chemically C 1.8-2.8 (in wt%, same as below), Mo 4.0-8.0, V 3.0-7.0, Nb 1.5-4.0, Cr 6.0-12.0, RE 0.1-0.25, Ti 0.15-0.40, N 0.08-0.20, K 0.06-0.18, Si<2.0, Mn<2.0, S<0.05 and P<0.05, except Fe and inevitable impurity. The roll core is made of high strength nodular cast iron comprising chemically C 3.2-3.6 (in wt%, same as below), Si 1.8-2.4, Mn 0.4-0.8, Ni 0.3-1.2, Cr 0.3-0.8, Mo 0.2-0.5, Mg 0.03-0.08, RE 0.05-0.14, P<0.08 and S<0.03, except Fe and inevitable impurity. The compound high speed steel roll has high wear resistance, simple making process and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a manufacturing method of a roll, in particular to a high-speed steel composite rolling roll and a manufacturing method thereof. Background technique [0002] Hot rolling rolls are key tools in steel rolling production, and they are used under extremely harsh conditions and must be able to withstand quite strong force and heat. In addition to high strength and toughness to prevent the roll from breaking during use, the surface should also have good wear resistance and heat resistance. A single roll material is difficult to meet the requirements of hot rolls. Composite rolls composed of roll core materials with good strength and toughness and high-speed steel roll body materials with good wear resistance and heat resistance are the main direction of roll development. Commonly used roll compounding methods mainly include: flushing compound casting meth...

AI Technical Summary

Problems solved by technology

However, because high-speed steel contains more alloying elements such as W, Cr, Mo, and V, and the density difference between these elements and the carbides formed is very large, under ordinary centrifugal casting conditions, the alloy elements of high-speed steel rolls are seriously segregated. , the outer layer has a low V content, while the W and Mo contents are high, and the inner layer is just the opposite, which seriously affects the use of the roll

In addition, in the process of centrifugal casting of high-speed steel composite rolls, the action of centrifugal force is likely to cause cracks in the rolls

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