A preparation method of slow-release magnesium alloy for molten steel magnesium treatment

Abstract

A method for preparing a slow-release magnesium alloy for magnesium treatment of molten steel, belonging to the field of steelmaking and alloy preparation for steelmaking. The preparation method adopts a two-step method: 1) Preparation of Mg‑Al alloy: After weighing the ingredients, use a vacuum induction furnace to smelt Mg‑Al ingots, and remove the oxide layer of the ingot for later use; 2) Preparation of Mg‑Al‑Fe alloy: Weigh After taking the ingredients, use a vacuum induction furnace to smelt the Al-Fe alloy solution; after cooling down the furnace, add Mg-Al ingots to the Al-Fe alloy solution, stir and cast, and remove the oxide layer of the ingot for later use. The preparation method of the present invention adds molten steel in the form of alloy, controls appropriate Mg, Al, and Fe contents, has a certain dilution function for magnesium metal, and is beneficial to the dissolution, diffusion and reaction of metallic magnesium; in the magnesium alloy prepared by the present invention, The presence of metallic iron can not only increase the melting temperature of the alloy, slow down the release of metallic magnesium, but also increase the density of the alloy, making it less likely to float out of the molten steel and cause burnage during use.

Description

technical field [0001] The invention belongs to the field of steelmaking and alloy preparation for steelmaking, and in particular relates to a preparation method of a slow-release magnesium alloy for magnesium treatment of molten steel. Background technique [0002] With the development of various fields of the national economy, the requirements for the performance of steel are constantly increasing. The cleanliness of steel and the quantity, particle size, shape and distribution of non-metallic inclusions in steel have an important impact on the performance of steel. With the gradual development of steelmaking theories and techniques such as converter steelmaking, external refining and continuous casting, the control level of molten steel cleanliness has been continuously improved, but there are still problems such as high total oxygen content of steel, excessive size of inclusions and poor stability of cleanliness control. The problems lead to the low pass rate of flaw det...

AI Technical Summary

Problems solved by technology

The method of the present invention is mainly aimed at the aluminum deoxidized steel with the largest commercial production volume, and its purpose is to control the release rate of metal magnesium in molten steel, realize the side melting, side dissolution and side reaction of metal magnesium, thereby control the gasification amount of metal magnesium, This is not only conducive to increasing the yield of magnesium metal, improving the effect of magnesium treatment, but also avoiding secondary oxidation of molten steel, nitrogen absorption and environmental pollution.

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