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A method for smelting high-manganese twip steel using an argon-oxygen decarburization furnace

An argon-oxygen decarburization furnace and oxygen blowing decarburization technology, applied in the field of metallurgy, can solve the problems of high cost, achieve high production efficiency, facilitate large-scale industrial production, and mature technology

Active Publication Date: 2017-03-22
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 manganese TWIP steel in an argon-oxygen decarburization furnace using the "substituting nitrogen for argon" process that replaces the conventionally used argon with nitrogen, The method of smelting high-manganese TWIP steel by "substituting nitrogen for argon" process in the argon-oxygen decarburization furnace solves the technical problem of high cost in AOD smelting high-manganese TWIP steel in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The carbon content in the molten steel before blowing is 2.98%, and the manganese content is adjusted to 24% according to the 92% yield, and the temperature is 1510°C.

[0020] Use 1:1 oxygen / nitrogen ratio for oxygen blowing decarburization, blowing the carbon content in molten steel to 0.83%; use 1:3 oxygen / nitrogen ratio for oxygen blowing decarburization, blowing the carbon content in molten steel to 0.55% ; Add 2% lime of the charging amount. The oxygen / nitrogen ratio of 1:6 was used for oxygen blowing decarburization, and the carbon content in molten steel was blown to 0.37%;

[0021] Table 1 Composition of molten steel at the end of AOD oxygen blowing decarburization period (mass fraction, %)

[0022] C mn Si P S N 0.37 24.32 0.54 0.027 0.013 0.272

[0023] Stop blowing oxygen, only blow argon, add 1% of molten steel calcium silicon, 0.6% of molten steel calcium silicon powder for deoxidation.

[0024] Remove the slag and make new s...

Embodiment 2

[0031] The carbon content in the molten steel before blowing is 2.93%, and the manganese content is adjusted to 24% according to the 92% yield, and the temperature is 1502°C.

[0032] Use 1:1 oxygen / nitrogen ratio for oxygen blowing decarburization, and blow the carbon content in molten steel to 0.85%; use 1:3 oxygen / nitrogen ratio for oxygen blowing decarburization, and blow the carbon content in molten steel to 0.53% ; Add 2% lime of the charging amount, and use an oxygen / nitrogen ratio of 1:6 for oxygen blowing decarburization, and blow the carbon content in molten steel to 0.38%; measure the temperature at 1703°C;

[0033] Table 3 Composition of molten steel at the end of AOD oxygen blowing decarburization period (mass fraction, %)

[0034] C mn Si P S N 0.38 24.37 0.51 0.029 0.012 0.281

[0035] Stop blowing oxygen, only blow nitrogen, add 1% silicon calcium powder of molten steel, 0.6% silicon calcium powder of molten steel for deoxidation. ...

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Abstract

The invention discloses a method for smelting high-manganese TWIP steel by adopting an argon-oxygen decarburization furnace. The method comprises the following steps: putting a raw material in the argon-oxygen decarburization furnace, then performing an oxygen blowing decarburization step, performing a reduction step, performing a desulphurization step and performing a component and temperature adjusting step to obtain qualified high-manganese TWIP steel; the oxygen blowing decarburization step adopts an oxygen and nitrogen mixed gas blowing method to smelt, and consists of multiple phases; in each phase, oxygen and nitrogen mixed gas is blown into molten steel in the argon-oxygen decarburization furnace from a bottom blowing or side blowing wind port; in the oxygen and nitrogen mixed gas, the oxygen-nitrogen volume ratio is within 3: 1-1: 10; and in the high-manganese TWIP steel, the carbon content is 0.35-1.2%, the manganese content is 15-33%, and the nitrogen content is lower than or equal to 0.1%. The method is low in smelting cost, convenient for operation and convenient for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a method for smelting steel, in particular to a method for smelting high-manganese TWIP steel by using 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%~33% manganese, and on this basis, different amounts of Al, Si, Ni, V, Mo, Cu, Ti, Nb, Cr and other elements. Among them: C 0.35%~1.05%, Mn 15%~26%, Si≤3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C22C33/04C22C38/04
Inventor 陈麒忠陈建斌栾怀壮李金光胡继业孙亚琴初荣孙功超陈锟徐春梅盛赵敏刘晓荣
Owner SHANGHAI INST OF TECH
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