Production method of ultra-low-carbon, low-silicon, low-manganese and low-aluminum steel continuous casting blank

Abstract

The invention relates to a production method of ultra-low-carbon, low-silicon, low-manganese and low-aluminum steel continuous casting blank. The continuous casting blank is composed of the followingchemical components of, in percentage by mass, less than or equal to 0.004% of C, less than or equal to 0.006% of Si, less than or equal to 0.06% of Mn, less than or equal to 0.010% of P, less than orequal to 0.010% of S, less than or equal to 0.004% of Alt, less than or equal to 0.02% of Cu, less than or equal to 0.02% of Cr and less than or equal to 0.02% of Ni, and the balance Fe and inevitable impurities; and the production process route of the continuous casting blank comprises the following steps of molten iron pretreatment, desulfurization, converter smelting, LF refining, RH vacuum treatment and continuous casting. Through the converter smelting, the LF refining, the RH vacuum treatment and the continuous casting technology, so that the chemical components are obtained to meet therequirement of the molten steel, the deoxidization effect and the liquidity of the molten steel are ensured, and casting by a small square billet continuous casting machine to obtain a steel billet with good surface and internal quality.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a production method for continuous casting slabs of ultra-low carbon, low silicon, low manganese and low aluminum steel. Background technique [0002] Ultra-low-carbon, low-silicon, low-manganese and low-aluminum steels have good electrical conductivity and ductility. After being rolled into wire rods, they are drawn and copper-plated to make metal composite materials. The composite materials have the strength and toughness of steel, copper Excellent conductivity and high-frequency characteristics, it is a replacement product of all copper materials used in the communication and electronics industries. [0003] It is very difficult to make ultra-low carbon, low silicon, low manganese and low aluminum steel. On the one hand, the molten steel needs to use RH vacuum furnace to remove carbon to a very low level by blowing oxygen. After decarburization, the dissolved o...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current production of continuous casting slabs of ultra-low carbon steel has a large amount of aluminum deoxidation during the smelting process, which makes it difficult to control the total oxygen and total aluminum of molten steel, resulting in poor castability of molten steel, and prone to sprue knots in the continuous casting process. and because of the low content of Al and Si in molten steel, resulting in poor deoxidation during continuous casting, resulting in bubbles in the slab