Gradient centrifugal casting process for large-diameter furnace rollers

Abstract

The invention discloses a gradient centrifugal casting process for cold-rolling heat treatment of large-diameter furnace rollers in the metallurgical industry. The process comprises the steps of adopting a steel-forging die for casting, finishing casting, coating the inner wall of a furnace roller with an insulating layer to lower the temperature of the furnace roller sequentially from outside to inside and cooling to between 100 and 120 DEG C within 10 to 15 minutes. As the furnace roller is cooled sequentially from outside to inside in the cooling process, the distribution ratio of columnar grains to equiaxed grains is improved, and the compactness of crystallization structure is increased so as to improve the high-temperature creep strength and oxidation resistance of materials. The large-diameter furnace rollers centrifugally cast are high in strength, free from deformation and uniform in surface hardness, have tensile strength Rm greater than or equal to 460 N / mm at room temperature, have yield strength RP0.2 greater than or equal to 240 N / mm, and have elongation A after fracture greater than or equal to 15 percent.

Description

technical field [0001] The invention relates to a centrifugal casting furnace roll, in particular to a large-diameter furnace roll centrifugal casting process 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 for automobiles are getting higher and higher, and heat treatment must be carried out before use. Roller to push the steel belt forward. Since the heat treatment temperature is in the range of 600-1200 °C and in a weakly oxidizing atmosphere, the furnace roll must be able to maintain the ability to transmit high-temperature steel strips in a long-term continuous operation; my country's furnace roll manufacturing industry has developed for nearly ten years. , has achieved good results, with the continuous innovation of science and technology, the requirements for furnace rollers are getting higher and higher...

AI Technical Summary

Problems solved by technology

In this way, the center structure of the cast furnace roll is loose, which reduces the mechanical properties of the steel pipe. The furnace roll is prone to deformation under thermal load operation, and the service life is short, which increases the cost of the steel plant.