Seamless aluminum-containing core-spun yarn

Abstract

The invention belongs to a refining technique outside a steelmaking furnace, and particularly relates to a seamless aluminum-containing core-spun yarn for molten steel disoxidation calcium treatment. The core-spun yarn is composed of an outer cladding and an inner core, wherein the outer cladding is coated on the external surface of the inner core; the outer cladding is composed of a steel belt which is 0.3-0.8mm thick; and the inner core is prepared from one or both of aluminum and calcium. The thickness of the outer cladding steel belt can be adjusted according to the size of the ladle, so that the calcium metal can be fed to the depth of molten steel, and the static pressure on the calcium metal is increased; and since the aluminum metal and the calcium metal can form an aluminum-calcium complex element in the molten steel, the mutual protection enhances the oxidation resistance. The introduction of the aluminum enhances the boiling point of the calcium metal and reduces the gasification of the calcium metal, thereby increasing the yield of the calcium metal and aluminum metal, and thoroughly solving the problem of splashing in the molten steel calcium treatment process.

Description

[0001] technical field [0002] The invention belongs to the refining technology outside the steelmaking furnace, and in particular relates to a seamless aluminum-containing cored wire for deoxidizing calcium treatment of molten steel. Background technique [0003] In the iron and steel smelting process, the refining process outside the furnace has been widely used. The refining process outside the furnace can further desulfurize, deoxidize and denature the inclusions to produce higher-quality ordinary steel and alloy steel to meet the needs of industrial and agricultural development and construction. Calcium treatment of molten steel is an out-of-furnace refining technology that adds metal calcium or alloys to the deep part of molten steel by spray metallurgy or wire feeding to achieve metallurgical effects such as deoxidation, desulfurization, and denaturation of non-metallic inclusions. Due to the low melting point (845°C) and low boiling point (1450°C) of metallic calci...

AI Technical Summary

Problems solved by technology

[0004] Several existing types of cored wires containing calcium or calcium alloys still have the following defects: silicon-containing low-calcium alloy cored wires, such as CaSi, have the disadvantage of increasing silicon in molten steel during the refining process outside the furnace

The disadvantage is that the solubility of high-purity calcium metal in molten steel is very small, even if the feeding rate is deep and the yield increases, there is still splashing when feeding in small and medium ladles

In addition, when the cored wire enters the depth of the molten steel and the outer cladding melts, the Ca metal directly contacts the molten steel that has not been completely deoxidized, and part of the Ca reacts violently with the oxygen in the steel, which further intensifies the splashing of the molten steel.