Solid metal magnesium alloy core-spun yarn for steelmaking desulfuration and manufacture method of solid metal magnesium alloy core-spun yarn

Abstract

The invention discloses a solid metal magnesium alloy core-spun yarn for steelmaking desulfuration. The solid metal magnesium alloy core-spun yarn comprises an external-layer steel pipe, an intermediate passivation layer and an internal core, wherein the internal core is a solid metal magnesium alloy wire with the total weight sum of impurities of not more than 0.2wt percent. A method for manufacturing the solid metal magnesium alloy core-spun yarn for steelmaking desulfuration comprises the following steps of: simultaneously sending the solid metal magnesium alloy wire and a steel belt into an argon arc welding unit, compacting, welding and drawing to form the internal core, and making the steel belt into a seamless steel pipe to be used as an external layer for wrapping the internal core. According to the solid metal magnesium alloy core-spun yarn, the gasification speed of metal magnesium can be reduced, the insertion depth of the magnesium alloy wire and the time of absorbing the metal magnesium by molten steel are increased, the quantity of the magnesium participating in the reaction is increased, the problem of low yield of magnesium power is overcome, harmful elements in the magnesium powder are avoided being dragged in, and thus the yield of the metal magnesium is greatly increased.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a solid magnesium alloy cored wire for steelmaking desulfurization and a manufacturing method thereof. Background technique [0002] Magnesium is silvery white and belongs to alkaline earth metal elements. Its chemical reaction is weaker than other alkaline earth metals such as K, Na, and Ca, and it is easy to combine with many elements such as O, N, and S to form MgO and MgS. These two oxides are stable compounds with high melting points and low specific gravity. When Mg is added to molten steel, it will undergo the transformation process of Mg(s)→Mg(l)→Mg(g)→[Mg], and dissolution, deoxidation, and desulfurization reactions will occur, and some parts will be burned during the addition process. Moreover, Mg has a low boiling point and high vapor pressure. The solubility in molten steel at 1873K is 0.1%, and its vapor pressure is 2.238MPa. Such a high vapor pressure makes magn...

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Problems solved by technology

Since the magnesium powder is used by special equipment to spray the magnesium powder into the molten steel to reach its bottom for reaction, since the gasification point of magnesium is only 1080°C, while the temperature of the molten steel reaches about 1500°C, when the magnesium powder passes through the molten steel , the magnesium powder will instantly reach its gasification point and form magnesium vapor. At the same time, because the surface area of ​​the magnesium powder is too large, too much magnesium will participate in the reaction, resulting in a large amount of magnesium gasification. The magnesium vapor formed by these two reasons is in the The molten steel gathers to form a large vapor pressure, causing a large amount of magnesium to escape from the molten steel, causing an explosion accident, and some magnesium is eventually burned in the furnace

This not only causes a waste of magnesium, but also because the contact time between magnesium and molten steel is too short, the amount of magnesium participating in the reaction is reduced, and there is not enough magnesium to fully react with the S element in molten steel, so the content of S element cannot be minimized

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