Large-diameter centrifugal casting furnace roller

Abstract

The invention discloses a large-diameter centrifugal casting furnace roller for cold-rolling heat treatment of automobile plates in the metallurgical industry. The roller comprises the elements in percentage by weight: 0.15 to 0.35 percent of C, 0.50 to 2.50 percent of Si, 0 to 2.00 percent of Mn, 8.00 to 10.00 percent of Ni, 17.00 to 19.00 percent of Cr, 0 to 0.04 percent of P, 0 to 0.03 percentof S, 0.80 to 1.20 percent of Nb, 0.20 to 0.50 percent of Ti, 0.50 to 0.80 percent of Sc, and the balance of Fe. On the basis of adopting a GX25CrNiSi18-9 material, an appropriate amount of Nb-Ti microalloy elements and Sc rare earth elements is added to the material so as to thin the grain size of steel, improve As-cast structure, increase high-temperature creep strength and anti-oxidation capacity of the roller and meet the requirements of heat treatment furnaces. The large-diameter furnace roller centrifugally cast and manufacture with the material is widely applied to various heat treatment furnaces.

Description

technical field [0001] The invention relates to a centrifugal casting furnace roll, in particular to a large-diameter centrifugal casting furnace roll for cold-rolling and heat-treating automobile plates and the like in the metallurgical industry. Background technique [0002] With the rapid development of the automobile industry, the requirements for steel strips used in automobiles are getting higher and higher, and heat treatment must be carried out before use. In order to achieve continuous annealing of steel strips and improve the efficiency of heat treatment, a furnace The roller pushes the steel belt 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 harsh conditions, the furnace rolls will have the following defects: 1. Wear on the s...

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

Large-scale steel enterprises such as Baosteel and Anshan Iron and Steel have to import furnace rolls from abroad every year for their wide-strip rolling mills. At present, GX25CrNiSi18-9 material is mainly used to make furnace rolls in China to improve the wear resistance of furnace rolls. This material is used to make small-diameter furnace rolls. Rolls have obvious advantages, but when making large-diameter furnace rolls, segregation is easy to occur, and its oxidation resistance is poor. The strength of the cast furnace rolls cannot meet the requirements, and it is easy to deform and produce ellipses. After the overall finishing, the wall thickness is uneven.

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