Device for controlling electric slag remelted atmosphere and method thereof

Abstract

The present invention is electroslag remelting apparatus and method with reduced oxygen content. The electroslag remelting apparatus has crystallizer, sealing cover over the crystallizer with oxygen pressure gauge, flow meter, vacuum set, etc. and features that the conducting rod and the consumable electrode are set inside the sealing cover and combined with sealing ring via sliding sealing. The atmosphere protection method for the remelting process includes vacuum pumping the inside of the sealing cover to 0.1-100 Pan and filling inert gas through the freeze drying machine into inside at pressure of 0.1-0.13 MPa. During the remelting process, the inert gas feeding amount or gas exhaust are controlled automatically. The present invention has reduced oxygen content in the remelting alloy and homogeneous alloy components as well as stable flow rate and constant pressure of inert gas in the remelting chamber.

Description

[0001] Field [0002] The invention belongs to the field of preparation methods for electroslag remelting by adopting air protection technology in the metallurgical industry. It is more suitable for reducing oxygen pollution in the electroslag remelting process by controlling the inert gas inlet and discharge in the melting chamber according to the set gas volume value. Background technique [0003] In the prior art, the preparation process of electroslag remelting is generally used in the air or in order to prevent the rise of hydrogen content, and the protection remelting is carried out in dry air, which will lead to the remelting of ingots. Oxygen content remains high. In addition, there is often a method of adding deoxidizers to the slag pool during remelting, such as Al, CaSi, FeSi, Mg, etc. When the slag is continuously deoxidized, the composition of the slag will inevitably change, resulting in Inconsistencies in the content of easily oxidizable elements in remelted i...

AI Technical Summary

Problems solved by technology

However, the latest ESR protection atmosphere method uses the method of directly filling inert gas during the ESR process. The disadvantage is that the atmosphere in the melting chamber is quite different between the initial and later stages of smelting during remelting. Due to the control accuracy The purity of the alloy ingot after remelting still cannot meet the requirements of use due to the low level, and it is also easy to cause inconsistency in the purity of the remelting alloy ingot in the height direction and the content of active elements

Therefore, this method cannot fundamentally solve the high oxygen content and the large burning loss of active elements (such as Al, Ti) in the traditional electroslag remelting alloy process, especially the active element content of the large ingot head and tail. more biased issues

Images