Mold steel electroslag re-melting slag system and use method of mold steel electroslag re-melting slag system

Abstract

The invention provides a mold steel electroslag re-melting slag system and a use method of the mold steel electroslag re-melting slag system and belongs to the technical field of metallurgy engineering refining. The slag system consists of the following ingredients in percentage by mass: 65 to 70 percent of CaF2, 20 to 25 percent of Al2O3, 5 to 10 percent of SiO2 and 5 to 10 percent of MgO. A slag required by the refining is prepared according to the mass percentage being 4 to 6 percent of the mass of a mold steel electrode ingot to be refined. The use method comprises the following process steps of preparation and baking of electroslag re-melting slag, preparation of re-melting self consumption electrodes, arc smelting of electroslag re-melting, normal smelting of electroslag re-melting, smelting later-period feeding filling, electroslag steel ingot slow cooling heat insulation and electroslag re-melting steel ingot demolding. After the electroslag ingot heat insulation is completed, the demolding is immediately converted into the subsequent nodulizing annealing treatment. When the system and the method provided by the invention are adopted for refining, the sulfur and phosphor contents in mold steel are further reduced, in addition, the contents of active elements such as C, Si and Mn in the steel do not basically generate burnt loss, and the quality of the mold steel electroslag re-melting steel ingot is further improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical engineering refining. Background technique [0002] Electroslag remelting (Electroslag remelting) is a method of smelting using the resistance heat generated when the current passes through the slag as a heat source. The steel cast or forged from the converter, electric arc furnace, and induction furnace is used as a consumable electrode. Heat for secondary refining. During the refining process, the consumable electrode rises at a certain speed. Under the protection of the slag solution and the water cooling of the external crystallizer, the molten steel crystallizes and solidifies continuously from bottom to top to form a refined electroslag ingot. During the refining process, the molten slag is a resistance heating element and also plays a protective role. The molten slag is suspended on the upper surface of the molten steel, separating the molten steel from the atmosphere, and the liquid...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a mold steel electroslag remelting slag system and its use method to solve most of the steel types targeted by the prior art, which are not specific, and are all high-temperature slag systems with high melting points. The high temperature of liquid slag is not conducive to dephosphorization, and the dephosphorization effect is not obvious. It can reduce the content of harmful elements sulfur and phosphorus in electroslag ingots, protect active elements from burning, and improve the quality of mold steel electroslag remelting ingots.