Process for prompting seaming of pore defect of continuous cast billet

Abstract

The invention relates to the technical field of production of large-section bars through continuous cast billets, in particular to a process for prompting seaming of a pore defect of a continuous cast billet. An exposed pore in the end face of the continuous cast billet is machined to form a blind hole, an active metal material is placed in the blind hole, sealed welding is carried out at the end face of the continuous cast billet through a steel plate, and the continuous cast billet is forged and rolled after being heated. Gas and the active metal are sealed in the through pore in the billet through the steel plate, and gas circulation is avoided. Since the active metal have high smelting points and boiling points, the active metal can be reacted with primary constituents, namely, O2 and N2, in the gas sealed in the billet, a formed reaction product has stable chemical properties under high temperature, no new gas is generated, the product yield can be effectively increased, and the product quality is improved remarkably.

Description

technical field [0001] The invention relates to the technical field of producing large-section rods from continuous casting slabs. Background technique [0002] During the solidification process of the large cross-section continuous casting slab, since there is no riser to feed the shrinkage cavity and porosity at the axis, there are often serious penetrating hole defects in the central area. In order to deal with the above-mentioned problems, people have been carrying out various attempts. At present, the repair of such hole defects is usually divided into two stages: firstly, the surface of the hole is brought into a state of macroscopic contact under the action of stress and strain, which is called the stage of hole closure; Metallurgical bonding is achieved through diffusion, recrystallization, etc. under the condition of time, which is the welding stage. Through the plastic processing technology of the closing and welding process of the above method, the surfaces to b...

AI Technical Summary

Problems solved by technology

In addition, the pressure generated by the gas in the closed pores will also inhibit the shrinkage of the pores and hinder the bonding of the interface

In the end, it is difficult for the traditional closing and welding process to eliminate hole defects efficiently and completely, forming gap residues, affecting the effective bearing capacity of forgings, becoming the defect source of part failure, and seriously affecting the mechanical properties and quality of products