Electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material

Abstract

The invention discloses a material of the working layer of an electromagnetic centrifugal casting high speed steel composite roller, the composition mass percentage of which is as follows: 1.8 to 2.5 of C, 3 to 10.0 of W, 2 to 4 of Mo, 4.0 to 7.0 of Cr, 0.5 to 2 of V, 0.03 to 0.5 of RE, less than or equal to 1 of Si, less than or equal to 1 of Mn, and marginal Fe and unavoidable impurities; wherein, an electromagnetic field with the magnetic strength of 0.21T to 0.30T is applied during the centrifugal casting and solidifying process of the roll barrel working layer. The high carbon, high tungsten and high speed steel material of the invention can produce high carbon, high tungsten and high speed steel composite rollers by adopting an electromagnetic centrifugal casting technique and by replacing V with W, thereby not only eliminating the macroscopic segregation of a cast structure and effectively controlling the even distribution of MC carbide, but also obviously improving the service performance of the high speed steel composite roller.

Description

technical field [0001] The invention relates to the field of metallurgical rolls, in particular to an electromagnetic centrifugal casting high-speed steel composite roll working layer material used for hot rolling work rolls. Background technique [0002] Due to the harsh operating conditions of the hot-rolled work rolls, which are subject to high temperature, impact loads and the circulation of cooling water, especially the front-end stand, the performance requirements for the work rolls are very high. [0003] In recent years, due to the excellent characteristics of centrifugal casting high-speed steel composite hot rolling rolls, it has been rapidly popularized and applied. The feature of this composite roll is that it has a working layer made of high-speed steel. A large amount of alloying elements such as Cr, Mo, V, W, and Nb are added to the high-speed steel material, which can form MC, M 2 C and M 6 Various types of alloy carbides such as C have high hardness, are u...

AI Technical Summary

Problems solved by technology

[0009] Chinese patent 93103678.X is a composite roll and its production method invented by Hitachi Metals Co., Ltd. The composition of cast iron in the working layer is by weight: 1.0-3.0% C, 2.0% or less Si, 2.0% or less Mn, 2.0-15.0% Cr, 10.0% or less Mo, 2.0-8.0% V, and the rest are Fe and unavoidable impurities. The invented material does not contain W and Nb, so there must be structure segregation and The problem of poor wear resistance

This invention has the advantages of low cost, high hardness, good wear resistance, long service life, and high operating rate of the rolling mill, but the content of W and Nb is controlled at a low level, which will inevitably affect its performance

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