Steel roller thermal refining process

Abstract

The invention discloses a steel roller thermal refining process. The steel roller thermal refining process comprises the specific thermal refining steps that when liquid metal is smelted, yttrium-based heavy rare earth alterant is added to iron liquid according to the proportion that 2-3 kilograms of the yttrium-based heavy rare earth alterant is added to every ton of the iron liquid; and the materials are fully mixed to be uniform, so that harmful elements of P, S, H and O are removed through the yttrium-based heavy rare earth alterant, grains are refined, and the micro-structure is improved.By means of the steel roller thermal refining process, strength and impact toughness of a roller material are improved, fatigue wear is reduced, and the service life of a roller is prolonged; in addition, a uniform, continuous and smooth oxidation film is pushed to be formed and maintained on the surface of the roller material, and thus wear resistance and corrosion resistance are improved; by means of an integral method, the adding amount of expensive alloying elements of molybdenum and nickel can be reduced, the alkalization heat treatment process can be improved, and the roller still has good comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of metallurgical processing, in particular to a quenching and tempering process for steel rolls. Background technique [0002] The variety and manufacturing process of steel rolls are constantly developing with the progress of metallurgical technology and the evolution of steel rolling equipment. Low-strength gray cast iron rolls were used in the rolling of soft non-ferrous metals in the Middle Ages. In the middle of the 18th century, Britain mastered the production technology of chilled cast iron rolls for rolling steel plates. In the second half of the 19th century, the progress of European steelmaking technology required the rolling of larger tonnage steel ingots, and the strength of the gray cast iron or chilled cast iron rolls could no longer meet the requirements. Ordinary cast steel rolls with a carbon content of 0.4% to 0.6% were born accordingly. The emergence of heavy forging equipment has furth...

AI Technical Summary

Problems solved by technology

In the second half of the 19th century, the progress of European steelmaking technology required the rolling of larger tonnage steel ingots, and the strength of the gray cast iron or chilled cast iron rolls could no longer meet the requirements.