Melt treating method of high-vanadium high-speed steel roller material for various rolling machines

Abstract

The invention discloses a melt processing method of high-speed steel rolls containing high vanadium used for various rolling mills. When molten steel in transportation, ferrovanadium granules are added with flowing, the addition amount of the ferrovanadium granules is 0.80-1.20 percent of total weight of the molten steel. Before the molten steel is poured over a pouring ladle, yttrium based rare earth magnesium alloy, nitriding ferrochrome, potassium salt and metal aluminum are added into the pouring ladle in advance; wherein, the addition amount of the yttrium based rare earth magnesium alloy is 0.30-0.80 percent of the weight of the molten steel, the addition amount of the nitriding ferrochrome is 0.20-0.50 percent of the weight of the molten steel, the addition amount of the potassium salt is 0.30-0.80 percent of the weight of the molten steel and the addition amount of the metal aluminum is 0.30-0.60 percent of the weight of the molten steel. When the temperature of the molten steel reaches between 1450-1480 DEG C, the molten steel in a centrifuge is directly cast into rollers; during the process of casting molten steel, the ferrovanadium granules and ferrotitanium granules with granule dimension between 5mm-8mm are added with flowing, wherein, the addition amount of the ferrovanadium granules and the ferrotitanium granules is respectively 0.30-0.80 percent and 0.40-1.00 percent of the total weight of the molten steel. The centrifugal casting high-speed steel rolls containing high vanadium of the invention has less segregation, no casting cracks, high rigidity and good abrasion resistance.

Description

technical field [0001] The invention belongs to the field of metal material smelting and casting, and relates to a melt processing method for iron and steel materials, in particular to a melt processing method for high-vanadium high-speed steel roll materials used in various rolling mills. Background technique [0002] Rolls are the main consumable spare parts in steel rolling production. The quality of rolls directly affects the quality of rolled materials and the production rate of steel rolling equipment. Improving roll quality and prolonging the service life of rolls is a subject of constant concern to roll development, production and use departments. For a long time, infinitely chilled cast iron and high-chromium white cast iron have been the main materials of choice for hot rolls. Because of their simple melting and casting processes, they have been widely used in roll production. However, these two types of roll materials also have disadvantages such as low high-tempe...

AI Technical Summary

Problems solved by technology

However, because high-speed steel contains more alloying elements such as W, Cr, Mo, and V, and the density difference between these elements and the carbides formed is very large, under ordinary centrifugal casting conditions, the alloy elements of high-speed steel rolls are seriously segregated. , the outer layer has a low V content, while the W and Mo contents are high, and the inner layer is just the opposite, which seriously affects the use of the roll

In addition, in the process of centrifugal casting of high-speed steel composite rolls, the action of centrifugal force is likely to cause cracks in the rolls

Therefore, after high-speed steel is smelted by ordinary methods, it is directly cast into rolls on a centrifugal casting machine. Due to the existence of segregation and the appearance of cracks, the pass rate of roll production is low and the use effect is poor.

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