Refining method of low-carbon and low-silicon manganese-contained aluminum killed steel liquid

Abstract

The invention discloses a refining method of low-carbon and low-silicon manganese-contained aluminum killed steel liquid, and belongs to the technical field of steel and iron metallurgy. The refining method properly controls the quantity of slag through adding lime and refining slag, and accurately feeds into a calcium line through Ca-Al-Si mass correlation to stably control an inclusion state of the steel liquid, so that the casting capacity of continuous casting steel liquid of this steel is improved, the quality of continuous casting products is guaranteed, the economic benefit is higher, and the popularization and application prospect is excellent.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for refining low-carbon, low-silicon and manganese-containing aluminum-killed molten steel. Background technique [0002] In the field of steel plates, cold-rolled complex deformed parts, such as parts used in wheels, automobile beams, etc., require weight reduction and weight reduction, require a certain strength and complex deformation. In order to meet the performance requirements, the general composition design feature of this type of steel is low-carbon, low-silicon, and manganese-containing aluminum-killed steel. The general basic composition range is [C]: 0.05%-0.17%, [Si]: 0.00%- 0.15%, [Mn] 0.50%-1.60%, [Als] 0.015%-0.08%. [0003] The Al content in this type of steel is high, which is easy to cause secondary oxidation of molten steel, and the castability of molten steel is poor. The difference in the conditions of the molten stee...

AI Technical Summary

Problems solved by technology

At present, the methods to solve the castability problem of this type of steel are basically divided into two categories. One is slag treatment, that is, top slag modification, that is, adding various deoxidizers to the slag surface, adding CaO, Al 2 o 3 However, the problem with this type of method is that it is necessary to strictly control the initial slag amount of the steelmaking converter, to thoroughly reform the ladle slag, and to take desulfurization into consideration. None of them have a good solution to the castability of molten steel, and the operation is difficult and requires a lot of refining time. For the continuous casting process, it is difficult to match the flexibility of production, and it is difficult to be generally accepted by the plate steel production process. Another big method is to carry out calcium treatment. According to the Al content required by the steel type, add the Ca component, that is, Ca / Al is controlled at about 0.1-0.15, but the actual results are biased towards theory, poor operability, and It does not conform to the general characteristics of various steel types, and it is difficult to be generally accepted by steel mills