Method for ensuring high sulfur yield and uniform distribution of sulfur content during electroslag remelting process of sulfur-bearing steel

Abstract

The invention provides a method for ensuring high sulfur yield and uniform distribution of the sulfur content during the electroslag remelting process of sulfur-bearing steel. The method comprises the following steps: an electroslag remelting process is adopted, the sulfur-bearing steel is used as a consumable electrode, returned slag and new remelted slag are used as electro slag, the moving of sulfur in the sulfur-bearing steel to the electro slag can be inhibited during the remelting process, and the loss of sulfur during the electroslag remelting process of the sulfur-bearing steel is reduced, so that the sulfur retaining purpose is achieved, wherein the returned slag is electro slag recovered after the electroslag remelting process of the sulfur-bearing steel. When the electro slag of the sulfur-bearing steel is remelted by the method, the fluctuation range of the sulfur content in an obtained steel ingot is controlled to be seven per mille, the sulfur retaining rate is controlled to be more than 84%, the sulfur retaining effect is good, the sulfur content in the steel ingot is uniformly distributed, the favorable and reliable performance of the sulfur-bearing steel is ensured, and the yield of the sulfur-bearing steel is improved.

Description

technical field [0001] The invention belongs to the technical field of electrometallurgy of ferrous metal materials, relates to the technical field of electrometallurgy, and in particular relates to a method for high sulfur yield and uniform distribution of sulfur-containing steel electroslag remelting. Background technique [0002] Free-cutting steel is an alloy steel that adds a certain amount of one or more free-cutting elements such as sulfur, phosphorus, lead, calcium, selenium, and tellurium to the steel to improve its machinability. Sulfur-containing steel is a free-cutting steel kind of. There is still a certain gap between the free-cutting steel produced in my country and the free-cutting steel imported from abroad, mainly reflected in the poor control of the type, quantity and shape of inclusions, resulting in cutting performance and mechanical properties that cannot meet the requirements of users, especially It is unable to meet the steel requirements of key compo...

AI Technical Summary

Problems solved by technology

Check the materials in the prior art that use electroslag remelting to prepare sulfur-containing steel. Most of them use ternary or quaternary acid slag. Although some protective measures are taken in the remelting process, the surface quality of the steel ingot is poor The yield is relatively low, especially the uneven longitudinal distribution of sulfur in the entire steel ingot, which directly affects the performance of the product; and in the existing electroslag remelting technology, according to the characteristics of electroslag The sulfur in the slag phase enters the slag phase and establishes a chemical equilibrium with the slag liquid phase. This process causes serious sulfur burning loss in the sulfur-containing steel, which in turn makes the steel ingots produced have low sulfur content and low quality.