Novel high carbon graphite steel roll ring and preparation method thereof

Abstract

The invention relates to a preparation method of a novel high carbon graphite steel roll ring. The roll ring is prepared by the following steps: adopting a centrifugal three-layer composite casting process, by adding alloy of special carbide elements V, Nb, Mo and the like, tapping when the temperature of a liquid phase reaches +120-150 DEG C, carrying out spheroidization treatment with 0.30-0.60 percent of BaCa, carrying out inoculation with 0.50-0.60 percent of CaSi as an inoculant after spheroidization, then carrying out killing for 3-8min and pouring, and carrying out special heat treatment by cold opening a box to obtain a finished product with the roll ring surface hardness and the matrix microstructure according with the requirements. Compared with an ordinary roll ring, according to the novel high carbon graphite steel roll ring, by adding the special carbide elements, through spheroidization treatment by the BaCa and inoculation by the CaSi as the inoculant, special fine grained carbides which are distributed uniformly and spheroidal graphite with the antioxidant capacity and the lubrication action are cultivated, so that the comprehensive performance of the roll ring is improved, and the service life of the roll ring is prolonged.

Description

technical field [0001] The invention relates to a novel high-carbon graphite steel roll ring and a preparation method thereof. Background technique [0002] The development of economic construction puts forward higher requirements on the quantity and quality of the roll ring. The existing roll ring is prone to serious segregation of alloy elements in the production process. The elements with high density are enriched in the outer layer of the roll ring, and the elements with low density are rich It is integrated in the inner layer of the roller ring, which makes the roller ring have problems such as low hardness, poor wear resistance, long preparation period, and prone to thermal cracks and poor thermal fatigue resistance, which directly affects the output and quality of the roller ring. Therefore, it is necessary to develop a new type to solve the above drawbacks. SUMMARY OF THE INVENTION [0003] In view of the above drawbacks, the present invention first provides a tec...

AI Technical Summary

Problems solved by technology

[0002] The development of economic construction has put forward higher requirements for the quantity and quality of the roll ring. The existing roll ring is prone to severe segregation of alloy elements during the production process. The elements with high density are enriched in the outer layer of the roll ring, and the elements with low density are rich in Collected in the inner layer of the roll ring, which makes the roll ring have low hardness, poor wear resistance, long production cycle, and prone to thermal cracks and poor thermal fatigue resistance, which directly affect the output and quality of the roll ring