Centrifugally-cast high alloy furnace roller body

Abstract

The invention discloses a centrifugally-cast high alloy furnace roller body, comprising the following elements by weight percent: 0.38-0.45 percent of C, 1.00-2.00 percent of Si, 0.50-1.50 percent ofMn, 24.0-26.0 percent of Cr, 33.0-35.0 percent of Ni, 1.2-1.8 percent of Nb, less than or equal to 0.03 percent of S, less than or equal to 0.045 percent of P, 0.03-0.05 percent of Zr, 0.05-0.10 percent of Ti and the balance of Fe and inevitable impurities. The lower limit of the content of the C in the material is properly increased, and microelements of the Ti and Zr are added in the original materials, after centrifugally casting and crystallizing, small carbides are formed to be dispersed in an austenitic matrix. During using, the austenitic matrix of the material is prevented from creeping at the high temperature, and the carbides are gradually transferred and gathered at the high temperature, thereby improving the high-temperature creeping strength and the oxidation resistance of thematerial; the centrifugally-cast furnace body with the large diameter has high strength without deformation, and the time of creeping and breaking at the high temperature is prolonged by over 10%.

Description

technical field [0001] The invention relates to a centrifugal casting furnace roll, in particular to a roll body of a large-diameter centrifugal casting high-alloy furnace roll used for cold-rolling and heat-treating plates in the metallurgical industry. Background technique [0002] With the rapid development of industrial economy and technology, all walks of life have higher and higher requirements for raw materials, such as steel strips for automobiles, which must be heat treated before use. In order to achieve continuous annealing of steel strips, to improve For the work efficiency of heat treatment, furnace rollers are installed in the heat treatment furnace to push the steel strip forward. Since the temperature of the heat treatment is carried out in the range of 600-1200°C and under a weakly oxidizing atmosphere, the furnace roller must be able to maintain the ability to transport the high-temperature steel strip during long-term continuous operation. Under such hars...

AI Technical Summary

Problems solved by technology

Under such harsh conditions, the furnace rolls will have the following defects: 1. Wear on the surface of the furnace roll, 2. Oxide or iron dust particles adhere to the surface of the furnace roll. When these particles reach a certain level, they will seriously affect the annealed steel. belt surface quality

On the one hand, due to its high content of Cr and Ni, the production cost is high. On the other hand, the material has obvious advantages in making small-diameter furnace rolls, but when making large-diameter furnace rolls, segregation is prone to occur, and its oxidation resistance is poor. , the strength of the cast furnace roll cannot meet the requirements, it is easy to deform and produce ellipse, and the wall thickness is uneven after the overall finishing

Bending deformation will occur during high temperature and high tension operation in the furnace, which will affect the operation of the steel strip and the surface quality of the steel strip, and the service life is only about 10 months