Electroslag remelting oxygenation inhibition method

Abstract

The invention relates to the technical field of electroslag remelting, in particular to an electroslag remelting oxygenation inhibition method. The method specifically comprises the following steps: 1) treating the surface of a consumable electrode, specifically, treating the surface of the consumable electrode by a mechanical polishing treatment mode so that the surface roughness of the consumable electrode reaches 50-150 [mu] m; 2) preparing coating component and carrying out proportioning, specifically, adopting corundum powder and aluminum powder as coating materials, and preparing the corundum powder and the metal aluminum powder according to a mass ratio of 1:4-1:6; 3) setting a spraying mode and parameters, specifically, carrying out surface spraying treatment on the consumable electrode by an electrostatic powder spraying process; and 4) carrying out other operations according to a conventional oxygenation inhibition process, specifically, enhancing inert gas protection to stop contact between air and slag; and adding a deoxidizing agent to inhibit slag oxygenation and molten steel oxygenation. The method is simple in process, safe, reliable, low in cost and efficient, and can effectively inhibit electroslag remelting molten steel oxygenation.

Description

technical field [0001] The invention relates to the technical field of electroslag remelting, in particular to a method for suppressing oxygen increase in electroslag remelting. Background technique [0002] Electroslag Remelting (ESR for short) is one of the main methods of special metallurgy and belongs to the secondary refining technology, so it is also called electroslag refining. The purpose of electroslag remelting is to remove harmful impurity elements and non-metallic inclusions in metals, purify metals, and obtain steel ingots with uniform and dense crystal structure. Electroslag remelting steel has the characteristics of high purity, low sulfur content, few inclusions, dense metallographic structure and uniform chemical composition. It has been widely used in aerospace, military industry, nuclear power, automobile, petrochemical and other key fields. The electroslag remelting furnace has simple structure, low production cost, convenient operation, and high metal y...

AI Technical Summary

Problems solved by technology

[0003] Whether it is dissolved oxygen or combined oxygen, they will bring a series of hazards to molten steel or solid steel: 1) The dissolved oxygen in molten steel can oxidize the added alloy elements, such as aluminum, boron, zirconium, rare earth, etc. Ineffective, and at the same time, endogenous non-metallic and sundries will be generated; during the solidification process of molten steel, the solubility of oxygen decreases as the temperature decreases, and the precipitated oxygen reacts with carbon to form carbon monoxide bubbles, which cause the steel ingots and castings to rise and lead to scrapping; during the solidification process Oxygen precipitated in the form of FeO can form a eutectic with a melting point of 940°C with FeS, and precipitate along the grain boundary, causing hot cracks in the steel ingot during hot processing

2) After the molten steel is solidified, most of the dissolved oxygen is transformed into non-metallic inclusions in the steel, causing great harm to the processing performance and serviceability of the steel

This patent uses physical methods to block the air and slag, which can effectively prevent the oxygenation of the slag, but it cannot be effectively controlled, because the oxides in the slag cause the oxygenation of the steel sample

[0006] In short, the existing technologies all suppress the oxygenation of the electroslag remelting process by means of blocking the air and changing the composition of the slag, but none of them can effectively suppress the oxygenation of the molten steel caused by the slag oxides.