Rare earth calcium core-spun yarn

Abstract

The invention provides a rare earth calcium core-spun yarn. The rare earth calcium core-spun yarn comprises a rare earth calcium core-spun material, a trapping agent and a metal shell protection tube. According to the method, the effect and the purpose that the molten steel is subjected to rare earth alloying by directly using the rare earth oxide without a special reduction smelting link by utilizing the excess (or surplus) temperature of the molten steel are achieved; the metal silicon is adopted as a reducing agent to convert rare earth oxide into rare earth metal for alloying, and the metal aluminum is adopted as a reducing agent to reduce calcium oxide into metal calcium (steam), so that the effects of deoxidizing the molten steel, removing inclusions and changing the morphology of the inclusions are achieved. The method has the characteristics of high rare earth yield, low cost, economy, practicability and convenience in large-scale production. The method has great positive significance in reducing the alloying cost of the molten steel, improving the quality of the molten steel, improving the utilization efficiency of the rare earth and saving rare earth resources.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a rare earth calcium cored wire. Background technique [0002] At present, when using rare earth alloys for deoxidation, alloying, changing the shape of inclusions, and improving the properties of steel, rare earth alloys or rare earth metals are usually used. Environmental pollution and other deficiencies, in addition, due to the small proportion of rare earth metals and rare earth alloys, floating between the molten steel in the ladle and the liquid steel slag above the liquid steel surface, the liquid steel slag directly oxidizes rare earth metals seriously, and the yield of rare earth metals is low. Disadvantages of waste of rare earth metals or rare earth alloys; the rare earth alloy powder or rare earth metal wire used in the existing cored wire, although the effect of deoxidation and alloying with rare earths in molten steel has been improved, it still needs time-c...

AI Technical Summary

Problems solved by technology

[0002] At present, when using rare earth alloys for deoxidation, alloying, changing the shape of inclusions, and improving the properties of steel, rare earth alloys or rare earth metals are usually used. Environmental pollution and other deficiencies, in addition, due to the small proportion of rare earth metals and rare earth alloys, floating between the molten steel in the ladle and the liquid steel slag above the liquid steel surface, the liquid steel slag directly oxidizes rare earth metals seriously, and the yield of rare earth metals is low. Disadvantages of waste of rare earth metals or rare earth alloys; the rare earth alloy powder or rare earth metal wire used in the existing cored wire, although the effect of deoxidation and alloying with rare earths in molten steel has been improved, it still needs time-consuming, labor-intensive and complicated smelting links After obtaining metallic rare earth metal or alloy block, the active rare earth elements (such as lanthanum and cerium) are planed (cut) and passivated to prepare rare earth metal powder (or processed into silk), which has complicated procedures and smelting. High processing costs, safety hazards such as metal powder explosion during rare earth powder processing, therefore, if a method is invented that utilizes the excess (or rich) temperature of molten steel and does not require a special reduction smelting process, it can directly use rare earth oxides for molten steel Deoxidation, rare earth alloying, high rare earth yield, removal of inclusions, good effect of changing the shape of inclusions, rare earth calcium cored wire, can reduce the cost of molten steel, improve the quality of molten steel, increase the efficiency of rare earth utilization, and save rare earth resources. very positive

Images