Cored wire of carbonate composite pure metal

Abstract

The invention discloses a cored wire of carbonate composite pure metal, and belongs to the technical field of melt purification and calcium treatment of steel metallurgy. The cored wire, from outside to inside, sequentially consists of an outer-layer steel belt, a middle steel belt layer, a carbonate powder layer and a pure metal wire. By virtue of a layered structure composed of the outer-layer steel belt and the middle steel belt layer, which have a metallurgical function of simultaneously completing calcium treatment and removing fine impurities, heat transfer is retarded, strength and frictional property are guaranteed, and a wire feeding speed is increased, so that content can react in the deep of molten steel. The carbonate powder can simultaneously generate liquid-phase and gas-phase small particles, so that a great number of micro impurities with dimensions of 5-50 [mu] m are effectively removed and purity of molten steel is improved in a promoted mode. By virtue of segmentation of a pure metal wire, a calcium wire or a magnesium wire is gasified section by section, and dimensions of generated metal bubbles are reduced, thereby reducing reaction severe degree and increasing a pure metal utilization rate. The cored wire disclosed by the invention can be applied to a secondary refining production process of various molten steel, and also realizes the purpose of completing calcium treatment and removing fine impurities.

Description

technical field [0001] The invention relates to the technical field of melt purification and calcium treatment of iron and steel metallurgy, in particular to a cored wire of carbonate composite pure metal, especially with the ability to simultaneously complete calcium treatment and remove fine inclusions during the refining process outside the furnace Function. Background technique [0002] The key to producing pure steel is to control the quantity and shape of inclusions. For high-grade steel grades, the latest research shows that if the inclusions larger than 5 μm can be removed, the small-sized inclusions are safe for the quality of the steel. Removing large-sized inclusions within 60 minutes of secondary refining is one of the key means to solve the problem. As the last resort of common secondary refining, calcium treatment is a metallurgical technology that adds calcium or calcium alloy to molten steel to deoxidize and desulfurize molten steel, control the shape of mo...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a carbonate composite pure metal cored wire, which overcomes the defects of the existing cored wire, can control the reaction speed of calcium treatment, and can produce liquid phase and gas phase tiny particles to promote a large number of size 5 ~50μm microscopic inclusions are effectively removed, thereby improving the purity of molten steel

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