Desulfurizing agent and adding method thereof

Abstract

The invention discloses a desulfurizing agent and an adding method thereof. The desulfurizing agent disclosed by the embodiment of the invention is an alloy consisting of 15-20 weight percent of magnesium, 40-45 weight percent of aluminum and 35-40 weight percent of iron. The desulfurizing agent disclosed by the invention has the melting point of 500 to 550 DEG C. The adding method of the desulfurizing agent disclosed by the invention comprises the following steps: adding the desulfurizing agent into molten steel in a wire feeding mode during RH vacuum refining, and processing the desulfurizing agent into metal wires with the diameter of 10-15mm, wherein the addition amount is 2-5kg / ton steel. The desulfurizing agent does not contain corrosive ingredients, temperature drop of the molten steel is reduced, and the desulfurizing rate is increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting desulfurization, in particular to a desulfurizer composed of an alloy and a adding method thereof. Background technique [0002] The presence of sulfur in steel will cause hot embrittlement of steel and reduce the mechanical properties, corrosion resistance and weldability of steel. From the perspective of steelmaking, the core of developing high-quality, high-value-added products is to improve the purity and uniformity of steel, especially to reduce the sulfur content of steel. For example, high-grade pipeline steel and oil pipeline steel require sulfur content Below 30ppm~50ppm. In the conventional smelting process route of molten iron pretreatment→converter→RH refining→continuous casting, it is not enough to control the sulfur content only by relying on deep desulfurization of molten iron or reducing the sulfur return of the converter. Since the converter is affected by raw mat...

AI Technical Summary

Problems solved by technology

[0009] The use of the above desulfurizers requires strict control of the (FeO+MnO) content in the slag to be below 5% to 10% in order to achieve a desulfurization rate of more than 30% to 60%. For this reason, the amount of slag discharged from the converter should be reduced, and the ladle slag should be carried out. Modification treatment, otherwise the desulfurization rate is not ideal, it is difficult to meet the requirements of deep desulfurization of molten steel, and the addition of a large amount of desulfurizer will cause a large degree of cooling of molten steel