A liquid core rolling production process of steel for wear-resistant balls

Abstract

The invention provides a with-liquid-core rolling manufacturing technique for steel for wear-resisting balls. Induction heating of a tundish is adopted for stabilizing continuous casting molten steeltemperature, and stabilization of the liquid core position of a continuous casting slab is guaranteed; and through control over secondary cooling and the pull speed, it is guaranteed that the continuous casting slab enters a withdrawal and straightening machine and a bar continuous mill in the with-liquid-core state, soft press and with-liquid-core rolling of the continuous casting slab are achieved, and the internal product quality of the steel balls is improved. Induction heating of the continuous casting slab in the high temperature state aims to prevent the low casting slab temperature anduneven temperature, an induction heating device conducts in-time supplementary heating on the casting slab after being tightly distributed on a continuous casting machine, a heating furnace is omitted, and it is guaranteed that the continuous casting slab directly enters the casting machine to be rolled in the state that the interior is provided with a liquid core; with-liquid-core rolling is carried out on the casting slab, the casting slab is provided with the liquid core, the resistance to deformation is greatly reduced, and conditions are created to large-deflection deformation; and through the heavy reduction deformation, deformation of the casting slab during rolling goes deep into and permeates the interior, and sufficient welding on loosening and shrinkage cavity defects inside the casting slab.

Description

technical field [0001] The invention relates to the field of production technology of wear-resistant ball steel, in particular to a production technology of rolling with liquid core for wear-resistant ball steel. Background technique [0002] In order to make the material have high wear resistance and long life, the wear-resistant ball steel usually uses high-carbon steel. Sometimes in order to obtain the corresponding structure after heat treatment, some alloying elements are added. The chemical composition of the typical steel is: C: 0.75 %, Si: 1.3%, Cr: 1.0%. Due to the high content of carbon and alloy elements, the solid-liquid phase temperature range is wide, which easily leads to the generation of shrinkage cavities. The so-called shrinkage cavity is a "bridge" phenomenon caused by overdeveloped columnar crystals during the solidification process of the slab. The volume shrinkage caused by the continuous cooling of the solidified part in the center of the billet can...

AI Technical Summary

Problems solved by technology

[0005] Technical problem to be solved: This application mainly solves the problem that the terminal electromagnetic stirring technology in the prior art is difficult to accurately locate the solidification end position, and can only solve segregation, but cannot solve the problem of porosity; overcome the small amount of reduction of the light reduction technology, which is very important for improving Technical problems of central shrinkage cavity and small porosity