A process method for flat-bottom plug-rod bottom injection molten steel ladle spheroidization treatment

Abstract

The invention provides a process method for spheroidizing a flat-base stopper rod type bottom pouring steel ladle. The process method comprises the following steps of installing and checking of a stopper rod of the flat-base stopper rod type bottom pouring steel ladle, filling of a spheroidizing agent, a nucleating agent and a covering agent, baking of the steel ladle, spheroidizing control and pouring. The process method for directly spheroidizing and inoculating the flat-base stopper rod type bottom pouring steel ladle overcomes the defects that after general ladle rocking and spheroidizing are carried out, in the slag removing and pouring processes, as slag on the upper surface of molten iron can not be removed thoroughly and enters a cavity easily, slag inclusion scrapping of a casting is caused, or after the common ladle rocking and spheroidizing are carried out, as the molten iron is transferred into a teapot ladle and then injected into the casting, the temperature drop of the molten iron is large, and operation is complex.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a process of spheroidizing and inoculating before the furnace of nodular cast iron. Background technique [0002] The spheroidizing treatment method mainly refers to the method of adding the spheroidizing agent. The spheroidizing treatment method is different, the spheroidizing agent is absorbed by the molten iron, and the spheroidizing effect is quite different. At present, the commonly used spheroidization treatment methods mainly include flushing method, self-built pressure adding magnesium method, subcontracting method, cover bag method, in-mold method, bell jar method, sealed flow method and on-mold method. [0003] Among the existing spheroidization treatment methods, the most commonly used method is the flushing method. The spheroidizer is broken into small pieces and put into the bottom side of the treatment bag, or a dike or pit is set at the bottom of the t...

AI Technical Summary

Problems solved by technology

The disadvantage is that the absorption rate of magnesium is low, generally only 30-40%, and the soot flash is serious

At present, this method is widely used in the production of ductile iron castings of various production scales at various temperatures and sulfur contents. The molten iron treated by this flushing method is generally shaken ladle, which cannot completely remove the scum and easily enters the cavity, causing slag inclusions in the casting. Scrap or use ordinary shaker bags for spheroidization and then transfer to teapot bags to inject castings, resulting in large temperature drop of molten iron, complicated operation, and prone to spheroidization decline