A method for smelting molten steel with high carbon content and high manganese content using an argon-oxygen decarburization furnace

Abstract

A method for smelting molten steel with high carbon content and high manganese content in an argon-oxygen decarburization furnace. Liquid metal raw materials, ferromanganese, solid metal materials, slagging materials, recarburizers, lime and / or dolomite are placed in argon-oxygen decarburization In the furnace, a decarburization step is also included. During the decarburization period, the carbon content in the blown molten steel is greater than or equal to 1.5%, and the temperature of the molten steel is higher than 1450°C; the decarburization period includes at least one of the following stages, the first stage The oxygen / argon ratio is ≤ 3:1, decarburization to 0.8%~1.2%; second stage oxygen / argon ratio ≤1:1, decarburization to 0.5%~0.8%; third stage oxygen-argon ratio ≤1:4, decarburization to product specifications The lower limit or the lower limit minus 0.1%~0.2%; then stop blowing oxygen and change to blowing argon; also include the steps of reduction, desulfurization, composition and temperature adjustment, when the carbon content is 0.35%~1.5%, and the manganese content is 10%~ Tapping at 26%. The invention has low production cost, high efficiency and is convenient for large-scale production.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for smelting steel, specifically a method for smelting molten steel with high carbon and high manganese content in an argon-oxygen decarburization furnace. Background technique [0002] Vehicle lightweight is the main measure to reduce vehicle exhaust emissions, reduce fuel consumption, and achieve the goal of producing environmentally friendly vehicles. Twin-induced plasticity (TWIP) steel has a good combination of strength and plasticity, and is the most suitable new steel type for automotive steel among various automotive steel schemes that have been proposed so far. [0003] As far as the various TWIP steel systems studied by countries in the world are concerned, they are all concentrated in the high manganese Fe-Mn-C base system containing 18% to 33% manganese, and on this basis, different amounts of Al, Si, Ni, V, Mo, Cu, Ti, Nb, Cr and other elements. Among...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for smelting high-carbon and high-manganese molten steel with an argon-oxygen decarburization furnace. The method solves the technical problem that manganese is easily oxidized during smelting of high-manganese TWIP steel in the prior art, and the yield is low during alloying, and simultaneously solves the technical problem of high cost during large-scale production of high-carbon high-manganese TWIP steel