Method for manufacturing calcium metal core-spun yarn of high purity

Abstract

The invention relates to a method for manufacturing calcium mental core-spun yarn of high purity; the key technical point is as follows: the method comprises the following processing steps: purifying and pouring process of calcium metal; passivating and sealing process of calcium metal bar; coating and molding process of packing steel belt; machine shaping process of solid calcium line. The calcium core of the calcium mental core-spun yarn is made of electrolytic calcium mental of 99% purity with properties of high purity, little impurity and non pollution; as mental calcium solid line, the line core is even in density and accurate in measure and the oxidation problem of calcium is under maximum control by the passivating and coating process, which lengthens the storage life for 3-5 years; the line diameter and the thickness of the steel belt can adjust when the proportioning requirement of the calcium mental core is met; the technology for heating processing can enhance the intensity of the core-spun yarn to avoid line breaking accident, and meanwhile guarantee that the product penetrates the slag interface quickly and reaches the inward of the steel molten bath and delay the melt of calcium when added to the molten steel; the reaction of calcium happens deep in the molten steel, so that absorptivity of the calcium is high and the loss of calcium is little and the molten steel is completely treated.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for manufacturing a high-purity calcium metal cored wire used for deoxidation and alloying in the steelmaking 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 field of iron and steel metallurgy and steelmaking. Calcium treatment process 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. Reliable process measures for chemical fine-tuning. In particular, it can change the shape and quantity of inclusions in the steel, so that the oxide and sulfide inclusions can be transformed into calcium-aluminate spherical composite inclusions with a low melting point, and the inclusions are refined and evenly distributed, which sign...

AI Technical Summary

Problems solved by technology

[0013] ①Calcium metal cored wire produced in China generally adopts the reduced calcium alloy produced by the aluminothermic reduction method. Since there is no purification technology, the purity of calcium is between 80% and 90%, and the calcium absorption rate has not reached the ideal effect. Impurities entering are easy to cause secondary pollution to molten steel

[0014] ② At present, calcium metal particles or calcium-iron alloy powder are mostly used as core materials in the production of calcium metal cored wire. There are gaps between the particles, and the density is difficult to guarantee. Therefore, the calcium content per unit cored wire will be inconsistent, resulting in metal The amount of calcium added cannot be accurately measured

[0015] ③In the production of cored wire, most of the steel strips are wrapped by pressing, and the joints are not tightly pressed together, which easily leads to loose metal calcium particles and insufficient density; the sealing effect is poor, the calcium particles are easy to oxidize and deteriorate, and the storage period is short

[0016] ④Due to the objective limitations of wire wrapping technology, the thickness of the steel strip is generally 0.3-0.6mm, which is likely to cause wire breakage accidents during wire feeding

At the same time, the overall strength of the cored wire cannot guarantee that it can quickly pass through the steel slag interface and enter the molten steel pool before melting. Instead, it melts in advance, resulting in a short reaction time between calcium and molten steel, insufficient treatment of molten steel, and a large loss of calcium. , low absorption rate