Method for rectangular continuous casting production of low-carbon low-silicon steel

Abstract

The invention discloses a method for rectangular continuous casting production of low-carbon low-silicon steel. The method includes the procedures of smelting of a converter, LF refining and rectangular blank continuous casting. In the procedure of smelting of the converter, manganese alloying is performed through low-carbon ferromanganese, and the terminal point carbon content of the converter is controlled to be 0.04 or below; in the steel discharging process, aluminum ingots are adopted for deoxidization; in the LF refining procedure, manganese component adjustment is performed through low-carbon ferromanganese, deoxidization is performed through an aluminum-based deoxidization agent, aluminum component adjustment is performed through an aluminum wire, molten steel calcium treatment is performed through a calcium and ferrum wire, and the soft blow time is not shorter than 10 min before leaving; in the rectangular blank continuous casting procedure, an argon-sealed protective sleeve is adopted for a large pack, integrated tundish is adopted for protective casting, a carbon-free covering agent is added in the initial stage of casting of a continuously-cast first pack, and the superheat degree of tundish molten steel is controlled to be 20-40 DEG C. According to the method, by reasonably controlling the aluminum content of molten steel, continuous casting bubble defects are avoided, it is also avoided that castability of high-aluminum-content molten steel is poor, and cost of a deoxidization agent is reduced.

Description

technical field [0001] The invention relates to a steelmaking method, in particular to a method for producing low-carbon and low-silicon electrode flat steel by rectangular continuous casting. Background technique [0002] Electrode flat steel, also known as cathode flat steel, is a special steel used to make electrolytic aluminum cathode rods. Electrode flat steel is generally low-carbon and low-silicon steel. When smelting low-carbon and low-silicon steels, in order to avoid excessive silicon content in steel, aluminum deoxidizers are often used for deoxidation of molten steel. The amount of aluminum deoxidizer added is a difficult point in production. If the amount of aluminum deoxidizer added is insufficient, the aluminum content in the steel is low, and the continuous casting billet is prone to produce subcutaneous air bubbles, which will cause bubble defects in the rolled material after rolling; the aluminum content in the steel is high. Continuous casting submerged ...

AI Technical Summary

Problems solved by technology

If the welding wire rod H08A is used to control a certain oxygen activity in molten steel to produce low-carbon and low-silicon electrode flat steel, because the oxygen content in molten steel is higher than that of aluminum-killed steel, the purity is low, and the compression ratio is small, the rolling The defects existing in the continuous casting slab during the manufacturing process are difficult to roll together, resulting in defects