Hot rolling control method for scale on edges of low-carbon aluminum killed steel

Abstract

The invention discloses a hot rolling control method for scale on edges of low-carbon aluminum killed steel, and belongs to the technical field of steel rolling. The hot rolling control method comprises the following steps: first, rolling 15 to 20 pieces of common steel, and carrying out rolling to obtain low-carbon aluminum killed steel billets, wherein the piece number of the low-carbon aluminum killed steel billets in the same roller period is lower than 50; heating the low-carbon aluminum killed steel billets, wherein the total time when the low-carbon aluminum killed steel billets are in a heating furnace is controlled to be 160 to 240 min, the temperature at the end of the first heating period is 1090 to 1110 DEG C, the temperature at the end of the second heating period is 1200 to 1260 DEG C, and the steel discharging temperature is 1180 to 1240 DEG C; conducting primary descaling on the heated low-carbon aluminum killed steel billets, wherein the primary descaling adopts double-row descaling; conducting rough rolling on the primarily descaled low-carbon aluminum killed steel billets; conducting finish rolling on the low-carbon aluminum killed steel billets suffered to rough rolling, and controlling the scale on edges of the low-carbon aluminum killed steel billets suffered to finish rolling. The hot rolling control method has the advantages that the surface quality of edges of strip steel can be improved effectively; the production efficiency is improved; and a foundation is laid for energy consumption and cost reduction in a pickling process.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for controlling hot rolling of an oxide scale at the edge of low-carbon aluminum-killed steel. Background technique [0002] Low-carbon aluminum-killed steel (such as SPHC) is a common cold-rolled base material and a large amount of raw material used by cold-rolled plate manufacturers. As profits in the steel industry decline, end customers are increasingly demanding product surfaces. Cold rolling mills have gradually increased their requirements for yield and production efficiency. It is no longer feasible to directly deliver parts that are not easy to pickle at the original edge, reduce the pickling speed and adopt edge trimming. The cold-rolled base material generally has a high coiling temperature. After the strip is coiled, the cold-rolling speed and oxygen content are inconsistent between the center and the edge of the strip, resulting in inconsistent scale...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for hot-rolling control of the iron scale at the edge of low-carbon aluminum-killed steel, which solves or partially solves the problem that the iron scale at the edge of the strip steel in the prior art is not easy to be pickled and needs to reduce the pickling speed and increase the pickling speed. Technical issues to ensure the surface quality of steel coils such as trimming amount

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