Electric furnace smelting method of steel for welding wire

Abstract

The invention discloses an electric furnace smelting method of steel for welding wires. The method comprises an electric furnace smelting working procedure, a ladle refining working procedure and a small square billet continuous casting working procedure. The key process technology comprises an electric furnace smelting efficient deep dephosphorization technology, and particularly comprises a slagging system, a temperature system and a slag flowing system of earlier-stage efficient dephosphorization; a ladle refining efficient dephosphorization technology prohibits using aluminium deoxidation in the whole smelting process and particularly comprises control on refining slag components and control on soft stirring time; and the small square billet continuous casting working procedure comprises control on continuous casting superheat degree and pulling rate and control on cooling process. The electric furnace smelting method of steel for welding wires has the advantages that the operation is simple; the production cost is low; and low-silicon low-aluminium low-phosphorus continuous casting slabs for steel for highly pure welding wires, containing less than 0.03% of silicon, less than 0.003% of aluminium, less than 0.008% of phosphorus and less than 0.006% of sulphur can be provided.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to an electric furnace smelting method for steel for welding wire. Background technique [0002] Due to the harsh operating environment of the power station structure, it is required to have a very high safety factor, so more stringent requirements are put forward for the construction materials, such as the extremely high purity requirements for the steel materials and supporting welding materials used. S, P, Al, Si and other elements can increase the brittleness of welded joints and increase the tendency of weld cracking. Therefore, some welding wire steels for power stations are required to have lower S, P, Al, and Si contents. Since the dephosphorization reaction in the molten steel smelting process needs to be carried out in a high alkalinity and highly oxidizing slag environment, it is easy to cause overoxidation of the molten steel during dephosphorization, so it is nec...

AI Technical Summary

Problems solved by technology

Since the dephosphorization reaction in the molten steel smelting process needs to be carried out in a high alkalinity and highly oxidizing slag environment, it is easy to cause overoxidation of the molten steel during dephosphorization, so it is necessary to strengthen deoxidation during subsequent smelting, and Al and Si are strong deoxidizing elements. , when its content is low, it will easily lead to insufficient deoxidation, which will further affect the desulfurization reaction

Therefore, it is difficult to control the dephosphorization, deoxidation and desulfurization reactions of molten steel when producing low-Si and low-P steel, and it is difficult to smelt high-purity welding wire steel in the end.