Method for improving yield of iron casting product inoculation nodulizer

Abstract

The invention discloses a method for improving the yield of an iron casting product inoculation spheroidizing agent, and belongs to the technical field of in-ladle inoculation spheroidizing of iron casting products. Covering chips, a nucleating agent and a spheroidizing agent are placed on the downstream side of the bottom of the steel ladle; and during tapping, the smelting furnace taps iron at the maximum furnace turning speed, after tapping is completed, the steel ladle is hoisted to rotate to remove slag from the backwater side of the steel ladle, and after the pouring temperature is reached, the steel ladle is hoisted for pouring. By optimizing the steel ladle structure, adjusting the position and height of the ladle bottom dam and changing the components and dosage of the covering agent, the yield of the ladle bottom spheroidizing agent is stabilized at 85% or above and can reach 90% at most, the quality risk caused by oxidation slag inclusion of the spheroidizing agent is greatly reduced, the slag inclusion defect of a casting is reduced, the molten iron inoculation quality is improved, and the production cost is reduced. And the molten iron quality is effectively improved.

Description

technical field [0001] The invention relates to the technical field of inoculation spheroidization of cast iron products, in particular to a method for improving the yield of inoculation spheroidizers of cast iron products. Background technique [0002] Ductile iron is a valuable high-strength cast iron material developed on the basis of gray cast iron. Due to the spherical distribution of graphite in ductile iron, the splitting effect on the matrix is ​​greatly reduced, its mechanical properties are significantly improved compared with gray cast iron, and its comprehensive properties are close to those of steel. It is based on its excellent performance that it has been successfully used to cast some parts with complex stress and high requirements for strength, toughness and wear resistance. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. [0003] At present, in the production process of nodular cast ir...

AI Technical Summary

Problems solved by technology

However, the density of the nodulizer is much lower than that of molten iron, and it will float to the surface in the molten iron. The unreacted nodulizer contacts with air and oxidizes to form slag inclusions. Improper handling of slag removal will easily cause slag inclusions inside the casting and affect the quality of the casting product.

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