Rolling technology for high-carbon steel in thin slab casting and rolling

Abstract

The invention provides a rolling technology for high-carbon steel in thin slab casting and rolling. The rolling technology includes the processes of continuous casting, heat evening, scale removing, rolling, inter-stand cooling, laminar cooling, reeling and insulation cover slow cooling. The rolling technology is characterized in that the rolling process includes three stages of Austenite perfect recrystallization rolling, non-recrystallization area Austenite rolling and two-phase area rolling. Medium-and-high-carbon steel structures rolled through the rolling technology are even and fine ferrite and particular pearlite, banded structures can be improved, the mechanical property is good, the annealing process does not need to be conducted before forming, cost is reduced, and quite high practicability is achieved.

Description

technical field [0001] The invention belongs to the field of steel rolling technology, and specifically refers to a thin slab continuous casting and rolling medium-high carbon steel rolling technology. Background technique [0002] Medium-high carbon steel has the characteristics of high hardness and high wear resistance after heat treatment, and is widely used in important pillar industries of the national economy such as mining, machinery, automobiles, and decoration. Since thin slab continuous casting and rolling has the characteristics of fast solidification speed, low heating temperature, and short heating time, it has unique advantages in controlling segregation and decarburization, which can significantly increase the yield of finished products and reduce production costs, making more and more steel mills Transfer medium and high carbon steel to the thin slab continuous casting and rolling production line, such as Zhujiang Iron and Steel (such as CN 101773930 A), Lian...

AI Technical Summary

Problems solved by technology

[0003] However, high carbon steel has high carbon content and thin slab cooling rate is fast, so medium and high carbon steel produced by thin slab continuous casting and rolling process generally have higher strength and hardness

However, hot-rolled medium-high carbon steel usually needs to be formed and then heat-treated after cold rolling. Therefore, in order to reduce the strength and hardness of medium-high carbon steel, an annealing process is usually added after hot rolling, which leads to an increase in product process and cost. Reduced production efficiency

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