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

An argon-oxygen decarburization furnace and carbon content technology are applied in the smelting of steel, and the argon-oxygen decarburization furnace is used to smelt molten steel with high carbon and high manganese content, which can solve the problems of high cost, easy oxidation of manganese, low yield and the like, Achieve the effect of high production efficiency, reduced raw material cost, raw material cost and operating cost reduction

Inactive Publication Date: 2017-08-25
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 200 kg of lime into the argon-oxygen decarburization furnace, and add 5.5 tons of molten steel provided by the induction furnace. The composition is shown in Table 1.

[0033]Table 1 Composition of AOD molten steel (mass fraction, %)

[0034] C mn Si P S 2.52 0.54 0.32 0.010 0.009

[0035] Add 3.1 tons of high-carbon ferromanganese, add 40 kg of ferrosilicon, add lime in two batches during the oxidative decarburization period, add 200 kg in each batch, and add 30 kg of fluorite in each batch.

[0036] Temperature measurement, temperature 1506 ℃.

[0037] Oxygen decarburization is carried out with an oxygen / argon ratio of 2:1, and the carbon content in molten steel is 0.85%. Use oxygen / argon ratio of 1:3 for oxygen blowing decarburization, blow to molten steel with carbon content of 0.53%, add lime. Use the oxygen / argon ratio of 1:6 for oxygen blowing decarburization, the carbon content of blowing into molten steel is 0.38%, and the tempe...

Embodiment 2

[0048] Add 200 kg of lime into the argon-oxygen decarburization furnace, and add 5.4 tons of molten steel provided by the induction furnace, the composition of which is shown in Table 4.

[0049] Table 4 Composition of AOD molten steel (mass fraction, %)

[0050] C mn Si P S 2.5 0.46 0.23 0.012 0.006

[0051] Add 1.56 tons of high-carbon ferromanganese, add 40 kg of ferrosilicon, add lime in two batches during the oxidation decarburization period, add 200 kg in each batch, and add 30 kg of fluorite in each batch.

[0052] Temperature measurement, temperature 1513 ℃.

[0053] Oxygen decarburization is carried out with an oxygen / argon ratio of 2:1, and the carbon content in the molten steel is 0.92%. , Temperature measurement 1701 ℃. Sampling, the composition of molten steel is shown in Table 5.

[0054] Table 5 Composition of molten steel at the end of AOD oxygen blowing decarburization period (mass fraction, %)

[0055] C mn Si P S ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068
Inventor 陈建斌孙功超陈麒忠栾怀壮李金光胡继业孙亚琴盛赵敏刘晓荣
Owner SHANGHAI INST OF TECH
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