Method for manufacturing solid cored-wires made of high purity calcium metal

Abstract

A method for manufacturing solid cored-wires made of high purity calcium metal is characterized by comprising the following operating steps: (1) manufacturing calcium metal into calcium metal pumps; (2) processing calcium wires; and (3) synchronously drawing the calcium wires. The invention manufactures the calcium steel common core wires closely integrating inner solid cored-wires made of calcium metal and an outer steel jacket. The calcium steel common core wires do not have the problem of calcium oxidation, thus the shelf life can be prolonged by 3-5 years. The wires are standard in diameter, uniform in density and accurate in measurement. The thickness of the outer steel jacket is 1-2mm which is about 3 times that of the steel strips for the existing products. The outer jacket has high strength, thus avoiding broken wire accidents. The thickness can ensure the product to enter and melt near the ladle bottom plate in the molten steel under the temperature over 1600 DEG C. The calcium reacts in the deep part of the molten steel, the molten steel is fully processed, less calcium is lost and the calcium absorption rate is high. The solid cored-wires are made of electrolytic calcium metal with purity of 99% and have high purity, less impurities and high calcium absorption rate.

Description

technical field [0001] The invention relates to the technical field of out-of-furnace refining, in particular to a method for manufacturing high-purity metallic calcium solid cored wire used in the out-of-furnace refining process of iron and steel enterprises. Background technique [0002] The current status of the application of calcium metal cored wire: [0003] Metal calcium cored wire is a product used in the refining process outside the furnace of iron and steel enterprises. Refining technology outside the furnace is a mature technology commonly used by iron and steel enterprises at home and abroad to improve the quality of molten steel and produce high-quality steel products. Calcium treatment of molten steel in the process of refining outside the furnace can change the inclusion Al 2 o 3 , MnS form, lower its melting point, improve the fluidity of aluminum-killed molten steel, improve the castability of molten steel in the continuous casting process, and solve the p...

AI Technical Summary

Problems solved by technology

[0013] ① The steel strips are not tightly bonded to each other, and the internal metal calcium particles are loose. The calcium particles are easy to oxidize and deteriorate, and the storage period is short.

[0014] ②At present, when producing calcium metal cored wire, 50-60% of the original iron powder must be mixed in to increase the linear density. Since the loose density of calcium metal particles and iron powder is relatively large, and most of them are artificially mixed, the mixed materials The uniformity of the cored wire cannot be guaranteed objectively, and the calcium content of the unit cored wire is inconsistent, resulting in the inability to accurately measure the amount of metal calcium added.

[0015] ③Due to the objective limitations of wire covering technology, the thickness of the steel strip is generally 0.3-0.6mm, which is likely to cause frequent wire breakage accidents during wire feeding. It cannot be melted near the bottom of the ladle, but melted in advance, resulting in short reaction time between calcium and molten steel, insufficient treatment of molten steel, large loss of calcium, and low calcium absorption rate

[0016] ④ At present, the domestic production of calcium metal cored wire generally adopts the reduced calcium particles produced by the aluminothermic reduction method. Since there is no purification technology, the purity of calcium is between 80-90%, resulting in low calcium absorption rate and secondary damage to molten steel. Pollution