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WO2018123808A1 - Procédé de production de ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone et ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone - Google Patents

Procédé de production de ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone et ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone Download PDF

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Publication number
WO2018123808A1
WO2018123808A1 PCT/JP2017/045933 JP2017045933W WO2018123808A1 WO 2018123808 A1 WO2018123808 A1 WO 2018123808A1 JP 2017045933 W JP2017045933 W JP 2017045933W WO 2018123808 A1 WO2018123808 A1 WO 2018123808A1
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WIPO (PCT)
Prior art keywords
medium
carbon ferromanganese
ferromanganese
low carbon
low
Prior art date
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Ceased
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PCT/JP2017/045933
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English (en)
Japanese (ja)
Inventor
慶喜 筒井
匡伸 増川
敏生 塩田
達月 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mizushima Ferroalloy Co Ltd
Original Assignee
Mizushima Ferroalloy Co Ltd
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Publication date
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Priority to MYPI2019003264A priority Critical patent/MY190117A/en
Priority to JP2018559121A priority patent/JP6962934B2/ja
Publication of WO2018123808A1 publication Critical patent/WO2018123808A1/fr
Priority to ZA2019/04059A priority patent/ZA201904059B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting

Definitions

  • the present invention relates to a method for producing medium-low carbon ferromanganese having a low nitrogen concentration and medium-low carbon ferromanganese.
  • This method is a method in which a silicon manganese melt having a target carbon content is first prepared in an electric furnace or the like, and then a manganese oxide such as manganese ore is added to the melt to oxidize and remove silicon in the silicon manganese melt. is there.
  • This method has a problem in that the power cost increases because an electric furnace is used.
  • Patent Document 1 uses a converter type reaction vessel to blow an oxygen gas from an upper blowing lance while blowing an inert gas from the furnace bottom tuyere and stirring the molten metal.
  • a method for producing medium-low carbon ferromanganese by oxidizing and removing carbon in molten high-carbon ferromanganese is disclosed.
  • Medium-low carbon ferromanganese is used as a manganese source in the steelmaking process in the ironmaking process. Since nitrogen becomes an impurity with respect to steel, it is preferable that the nitrogen concentration of the medium-low carbon ferromanganese is low. However, the lower limit of the nitrogen concentration of the medium-low carbon ferromanganese produced by the production method disclosed in Patent Document 1 is about 400 ppm.
  • nitrogen concentration can be reduced if silicon is contained in medium-low carbon ferromanganese.
  • the nitrogen concentration of the medium / low carbon ferromanganese can be reduced to 300 ppm or less by setting the silicon concentration of the medium / low carbon ferromanganese to about 1% by mass.
  • silicon concentration is low.
  • the present invention has been made in view of the above problems, and the object of the present invention is to provide a method for producing medium and low carbon ferromanganese capable of producing medium and low carbon ferromanganese having a low silicon concentration and a nitrogen concentration of 300 ppm or less, and nitrogen. It is to provide a medium and low carbon ferromanganese having a low concentration and a low silicon concentration.
  • a reaction vessel equipped with a top blowing lance and a bottom blowing tuyere is charged with molten high carbon ferromanganese, and an oxygen-containing gas is blown from the top blowing lance, and an inert gas is fed from the bottom blowing tuyere.
  • the silicon-containing alloy raw material is used as the high-carbon ferromanganese molten metal or the medium-low carbon ferromanganese molten metal so that the silicon concentration of the medium-low carbon ferromanganese is 0.01% by mass or more and 0.5% by mass or less.
  • (3) The silicon-containing alloy raw material is used as the high-carbon ferromanganese molten metal and the medium-low carbon ferromanganese molten metal so that the silicon concentration of the medium-low carbon ferromanganese is 0.01% by mass or more and 0.5% by mass or less.
  • the method for producing medium-low carbon ferromanganese according to (1) which is added.
  • the method for producing medium-low carbon ferromanganese according to (2) wherein the silicon-containing alloy raw material is added to the molten medium-low carbon ferromanganese after completion of decarburization refining.
  • medium-low carbon ferromanganese By implementing the method for producing medium-low carbon ferromanganese according to the present invention, it is possible to produce medium-low carbon ferromanganese having a silicon concentration of 0.5% by mass or less and a low nitrogen concentration.
  • FIG. 1 is a schematic cross-sectional view showing a state where a high carbon ferromanganese molten metal is decarburized and refined using a converter-type reaction vessel.
  • FIG. 2 is a cross-sectional view showing a state in which a molten medium-low carbon ferromanganese melt is used as a mold.
  • FIG. 3 is a graph showing the relationship between the elapsed time from the end of decarburization refining and the maximum temperature of the ferromanganese surface.
  • the present inventors have found that the following three points are important for lowering the nitrogen concentration of medium-low carbon ferromanganese. 1. To reduce the amount of nitrogen absorbed when tapping the medium and low carbon ferromanganese melt. 2. 2. Argon gas is blown from the bottom blowing tuyere to lower the nitrogen partial pressure of the medium and low carbon ferromanganese melt. Use raw materials with low nitrogen content in the production of medium and low carbon ferromanganese.
  • the present inventors have shown that the nitrogen concentration of the medium-low carbon ferromanganese can be stably reduced by adding silicon within a range where the silicon concentration of the medium-low carbon ferromanganese satisfies 0.5% by mass or less. As a result, the present invention was completed.
  • the present invention will be described through embodiments of the present invention.
  • the high carbon ferromanganese is ferromanganese having a carbon concentration exceeding 2.0 mass%.
  • Medium carbon ferromanganese is ferromanganese having a carbon concentration exceeding 1.0 mass% and not more than 2.0 mass%, and low carbon ferromanganese is ferromanganese having a carbon concentration of 1.0 mass% or less. .
  • FIG. 1 is a schematic cross-sectional view showing a state in which a high-carbon ferromanganese molten metal is decarburized and refined using a converter-type reaction vessel.
  • the reaction vessel 10 is a converter-type reaction vessel, and includes a vessel main body 12 that accommodates the molten high carbon ferromanganese 20 and an upper blowing lance 16 that blows the oxygen-containing gas 24 onto the molten high carbon ferromanganese 20. .
  • a tap 14 for pouring the molten medium and low carbon ferromanganese after refining treatment, and a bottom blowing tuyere 18 for blowing argon gas 26 into the high carbon ferromanganese melt 20 at the bottom.
  • a plurality are provided.
  • the high carbon ferromanganese melt 20 reduced and smelted in the vertical smelting furnace is charged into the container body 12.
  • the high carbon ferromanganese molten metal 20 is blown with argon gas 26 from the bottom blowing tuyere 18 and stirred, and an oxygen-containing gas 24 is blown from the top blowing lance 16 to oxidize and remove carbon.
  • the oxygen-containing gas 24 blown from the upper blowing lance 16 is, for example, a mixed gas of oxygen and a non-oxidizing gas that lowers the oxygen partial pressure, such as a rare gas, or an oxygen gas containing only oxygen.
  • the argon gas 26 blown from the bottom blowing tuyere 18 is an example of an inert gas.
  • the slag 22 may be formed by adding a faux material in advance to the container body 12.
  • the molten high carbon ferromanganese 20 may be produced by reduction smelting in an electric furnace.
  • the high carbon ferromanganese molten metal 20 it is preferable to stir the high carbon ferromanganese molten metal 20 by setting the flow rate of the argon gas 26 blown into the high carbon ferromanganese molten metal 20 from the bottom blowing tuyere 18 to 0.01 Nm 3 / t ⁇ min or more. Blowing the argon gas 26 from the bottom blowing tuyere 18 lowers the nitrogen partial pressure of the high carbon ferromanganese melt 20, so the nitrogen concentration of the high carbon ferromanganese melt 20 also decreases.
  • the flow rate of the argon gas 26 blown from the bottom blowing tuyere 18 is more than 0.20 Nm 3 / t ⁇ min, the argon gas 26 is blown through as it is without contributing to the stirring of the molten high carbon ferromanganese 20. For this reason, it is preferable that the flow rate of the argon gas 26 blown into the high carbon ferromanganese molten metal 20 from the bottom blowing tuyere 18 is 0.20 Nm 3 / t ⁇ min or less.
  • “Nm 3 / t ⁇ min” means the blowing amount of argon gas per minute in the high carbon ferromanganese molten metal 1t.
  • the blowing of the oxygen-containing gas 24 and the blowing of the argon gas 26 are continued until the carbon concentration of the high carbon ferromanganese melt 20 is lowered to a predetermined concentration.
  • decarburization is performed until the carbon concentration of the molten high carbon ferromanganese 20 becomes 2.0 mass% or less.
  • decarburization is performed until the carbon concentration of the molten high carbon ferromanganese 20 becomes 1.0 mass% or less.
  • the carbon concentration of the high carbon ferromanganese molten metal 20 during the decarburization treatment is determined by the measured value of the carbon concentration of the high carbon ferromanganese molten metal 20 discharged from the vertical smelting furnace and the oxygen-containing gas 24 blown from the top blowing lance 16. It can be estimated from the supply amount and the decarbonation efficiency of the molten ferromanganese obtained empirically. For this reason, the supply amount of oxygen calculated from the measured value of the carbon concentration of the high carbon ferromanganese melt 20, the decarbonation efficiency, and the target carbon concentration is supplied, so that the high carbon ferromanganese melt It is determined that 20 carbons have been reduced to the carbon concentration described above.
  • the high carbon ferromanganese molten metal 20 may be collected to measure the carbon concentration, and it may be confirmed whether there is a difference between the estimated value of the carbon concentration of the high carbon ferromanganese molten metal 20 and the measured value.
  • the blowing of the oxygen-containing gas 24 from the top blowing lance 16 is stopped and the decarburization refining is finished.
  • the silicon-containing alloy raw material is added to the molten medium-low carbon ferromanganese so that the silicon concentration of the medium-low carbon ferromanganese after cooling is 0.01% by mass or more and 0.5% by mass or less.
  • ferrosilicon or silicomanganese may be used as the silicon-containing alloy material.
  • the amount of the silicon-containing alloy raw material added to the medium-low carbon ferromanganese molten metal is determined by considering the oxidation rate of silicon in the molten metal, and the silicon concentration of the medium-low carbon ferromanganese after cooling is 0.01 mass% or more and 0.5 mass. It may be determined empirically to be less than or equal to%.
  • the silicon-containing alloy raw material so that the silicon concentration of ferromanganese is less than 0.01% by mass because the effect of reducing the nitrogen concentration of molten manganese is reduced. Since silicon becomes an impurity in steel, when the silicon-containing alloy raw material is added in an amount where the silicon concentration of ferromanganese exceeds 0.5% by mass, the silicon concentration as an impurity in the steel increases and the medium-low carbon ferromanganese This is not preferable because the value of is lowered.
  • FIG. 2 is a cross-sectional view showing a state in which the molten medium and low carbon ferromanganese is discharged from a mold.
  • the medium-low carbon ferromanganese molten metal 21 decarburized and added with the silicon-containing alloy raw material is discharged from the outlet 14 into the mold 30 through the jar 28 with the container body 12 tilted. .
  • the medium-low carbon ferromanganese melt 21 is sprinkled and air cooled in the mold 30.
  • the medium and low carbon ferromanganese molten metal 21 is 15 from the time when the blowing of the oxygen-containing gas 24 from the top blowing lance 16 is stopped and the decarburization refining is completed.
  • the maximum temperature of the ferromanganese surface exposed from the mold 30 is cooled to 800 ° C. or lower.
  • Ferromanganese has been nitrogen-absorbed even after solidifying in the mold, and the nitrogen-absorption rate is fast until the temperature reaches about 800 ° C. For this reason, the time until the surface temperature of the ferromanganese becomes 800 ° C.
  • the nitrogen absorption amount of ferromanganese decreases, and the nitrogen concentration of medium-low carbon ferromanganese can be reduced to 300 ppm or less.
  • the above-described rapid cooling of the medium-low carbon ferromanganese molten metal 21 can be performed by water spray cooling.
  • the surface temperature of ferromanganese can be measured using a radiation thermometer.
  • FIG. 3 is a graph showing the relationship between the elapsed time from the end of decarburization refining and the maximum temperature of the ferromanganese surface.
  • the horizontal axis is the elapsed time (min) from the end of decarburization refining
  • the vertical axis is the maximum temperature (° C.) of the ferromanganese surface.
  • the solid line in FIG. 3 is the surface temperature profile when water spray cooling is performed so that the maximum temperature of the ferromanganese surface is 800 ° C. or less within 15 minutes from the end of decarburization refining. It is a surface temperature profile at the time of cooling the maximum temperature of a manganese surface to near 800 degreeC.
  • the nitrogen concentration of ferromanganese cooled with the surface temperature profile shown by the solid line in FIG. 3 was lower than the nitrogen concentration of ferromanganese cooled with the surface temperature profile shown by the broken line.
  • high-temperature molten manganese and solidified manganese at 800 ° C. or higher have a high nitrogen absorption rate.
  • at least the maximum temperature of the ferromanganese surface exposed from the mold 30 that can come into contact with air is cooled to 800 ° C. or less within 15 minutes from the end of decarburization refining. Thereby, the amount of nitrogen absorbed by manganese is reduced, and the nitrogen concentration of medium-low carbon ferromanganese can be reduced to 300 ppm or less.
  • the amount of cooling water in the case of sprinkling cooling may be determined by conducting a cooling experiment on the medium-low carbon ferromanganese melt discharged from the mold 30 in advance.
  • medium / low carbon ferromanganese having a low nitrogen concentration can be produced from high carbon ferromanganese by carrying out the method for producing medium / low carbon ferromanganese according to the present embodiment.
  • silicon of medium-low carbon ferromanganese is added by adding a silicon-containing alloy raw material to the medium-low carbon ferromanganese molten metal 21 so that the silicon concentration of ferromanganese is 0.01% by mass or more and 0.5% by mass or less.
  • the nitrogen concentration of the medium-low carbon ferromanganese can be stably reduced while maintaining the concentration at 0.5% by mass or less.
  • a ferromanganese cold material may be added.
  • the temperature of the medium-low carbon ferromanganese molten metal 21 can be rapidly reduced.
  • Example 1 The high-carbon ferromanganese molten metal 26t reduced and smelted in the vertical smelting furnace was charged into the same reaction vessel as the reaction vessel 10 shown in FIG.
  • the components of the high carbon ferromanganese charged into the reaction vessel were: Mn: 73.5% by mass, Fe: 19.0% by mass, Si: 0.4% by mass, C: 7.0% by mass, P: 0 0.013 mass%, and the temperature after charging the reaction vessel was 1350 ° C.
  • argon gas was blown into the ferromanganese melt at a feed rate of 0.07 Nm 3 / t ⁇ min from the bottom blowing tuyere, and oxygen gas was fed from the top blow lance at an oxygen feed rate of 1.5 Nm 3 / t ⁇ min.
  • Decarburization refining was performed by spraying on molten ferromanganese. When the oxygen supply amount reached 80 Nm 3 per metal ton, the blowing of oxygen gas from the top blowing lance was stopped and the decarburization refining was completed.
  • the components are Mn: 75.3% by mass, Fe: 23.2% by mass, Si: 0.3% by mass, C: 1.0% by mass, P: 0.014% by mass, N : 310 ppm of ferromanganese cold material was added so that the molten metal temperature after melting was about 1550 ° C. Thereafter, the molten ferromanganese was poured out into a mold, and the molten ferromanganese was sprinkled and cooled in accordance with the surface temperature profile shown by the solid line in FIG. As a result, the maximum temperature of the ferromanganese surface exposed from the mold became 800 ° C. or less after 9 minutes from the end of decarburization refining.
  • the components of the low carbon ferromanganese produced in this way are: Mn: 75.3% by mass, Fe: 23.1% by mass, Si: 0.3% by mass, C: 1.0% by mass, P: 0 .014% by mass and N: 220 ppm.
  • Example 2 Decarburization refining was performed under the same conditions as in Example 1, and after completion of decarburization refining, the components were Mn: 75.3 mass%, Fe: 23.2 mass%, Si: 0.3 mass%, C: 1.0 A ferromanganese cold material having a mass%, P: 0.014 mass%, N: 310 ppm, and Si: 75.0 mass%, Fe: 24.5 mass% ferrosilicon were added to the molten ferromanganese. .
  • the amount of ferrosilicon added to the molten ferromanganese is such that the silicon concentration of the low-carbon ferromanganese is 0.5% by mass, and the amount of ferromanganese cold material added is after the ferromanganese cold material is dissolved.
  • the amount of the molten metal is about 1550 ° C.
  • the added ferromanganese cold material and ferrosilicon were dissolved, and the molten ferromanganese having a molten metal temperature of about 1550 ° C. was poured out into the mold, and the molten ferromanganese was cooled according to the surface temperature profile of the solid line shown in FIG. As a result, the maximum temperature of the ferromanganese surface exposed from the mold became 800 ° C. or less after 9 minutes from the end of decarburization refining.
  • the components of the low carbon ferromanganese produced in this way are: Mn: 75.3% by mass, Fe: 23.1% by mass, Si: 0.5% by mass, C: 1.0% by mass, P: 0 .014% by mass and N: 200 ppm.
  • Decarburization refining was performed under the same conditions except that the amount of argon gas blown from the bottom blowing tuyere was 0.06 Nm 3 / t ⁇ min.
  • the components were Mn: 75.3 mass%, Fe : 23.3 mass%, Si: 0.3 mass%, C: 1.0 mass%, P: 0.014 mass%, N: 310 ppm ferromanganese cold material was added, but no ferrosilicon was added .
  • the added ferromanganese cold material was melted, and the molten ferromanganese having a molten metal temperature of about 1550 ° C. was poured out into the mold, and the molten ferromanganese was cooled according to the surface temperature profile indicated by the broken line shown in FIG. As a result, the maximum temperature of the ferromanganese surface exposed from the mold decreased to 800 ° C. or less in 23 minutes from the end of decarburization refining.
  • the components of the low carbon ferromanganese produced in this way are: Mn: 75.3% by mass, Fe: 23.3% by mass, Si: 0.3% by mass, C: 1.0% by mass, P: 0 .014% by mass and N: 310 ppm.
  • the low carbon ferromaggan by the method for producing medium to low carbon ferromanganese according to the present embodiment, the medium to low carbon ferro having a low nitrogen concentration of 300 ppm or less and a silicon concentration of 0.5 mass% or less. It can be seen that manganese can be produced.
  • the silicon concentration is 0.01 mass% or more and 0.5 mass% or less, and the nitrogen concentration is 300 ppm or less. It was confirmed that carbon ferromanganese could be produced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

L'invention concerne un procédé de production de ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone avec lequel il est possible de produire un ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone ayant une faible concentration en azote et une faible concentration en silicium ; et un ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone ayant une faible concentration en azote et une faible concentration en silicium. Du ferromanganèse fondu à haute teneur en carbone est chargé dans un récipient de réaction équipé d'une lance de soufflage par le haut et d'une tuyère de soufflage par le bas, et pendant qu'un gaz contenant de l'oxygène est soufflé à l'intérieur depuis la lance de soufflage par le haut, un gaz inerte est soufflé à l'intérieur depuis la tuyère de soufflage par le bas pour décarboniser et raffiner le ferromanganèse fondu à haute teneur en carbone de façon à le transformer en ferromanganèse fondu à faible teneur en carbone ou à teneur moyenne en carbone, et un ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone est produit par coulée du ferromanganèse fondu à faible teneur en carbone ou à teneur moyenne en carbone dans un moule de coulée et par refroidissement de celui-ci, le refroidissement étant effectué de sorte que le ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone exposé à partir du moule de coulée possède une température de surface inférieure ou égale à 800 °C dans les 15 minutes qui suivent l'achèvement de la décarbonisation et du raffinage.
PCT/JP2017/045933 2016-12-27 2017-12-21 Procédé de production de ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone et ferromanganèse à faible teneur en carbone ou à teneur moyenne en carbone Ceased WO2018123808A1 (fr)

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MYPI2019003264A MY190117A (en) 2016-12-27 2017-12-21 Medium- or low-carbon ferromanganese production method and medium- or low-carbon ferromanganese
JP2018559121A JP6962934B2 (ja) 2016-12-27 2017-12-21 中低炭素フェロマンガンの製造方法および中低炭素フェロマンガン
ZA2019/04059A ZA201904059B (en) 2016-12-27 2019-06-21 Medium- or low-carbon ferromanganese production method and medium- or low-carbon ferromanganese

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JP2016-253447 2016-12-27
JP2016253447 2016-12-27

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WO2020152945A1 (fr) * 2019-01-24 2020-07-30 Ｊｆｅスチール株式会社 Procédé de production de ferromanganèse pauvre en carbone
JP2021532260A (ja) * 2018-07-23 2021-11-25 ポスコPosco 合金鋼の製造方法

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CN112961958A (zh) * 2021-02-24 2021-06-15 首钢京唐钢铁联合有限责任公司 一种含硫超高氧超低碳钢的生产方法

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JPH01316437A (ja) * 1988-06-14 1989-12-21 Kawasaki Steel Corp 中、低炭素フェロマンガンの製造方法
JPH06330227A (ja) * 1993-05-18 1994-11-29 Mizushima Goukintetsu Kk 中・低炭素フェロマンガンの製造方法及び製造装置
JP2010248536A (ja) * 2009-04-10 2010-11-04 Sumitomo Metal Ind Ltd 高Ｍｎ含有金属の製造方法

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JPH01316437A (ja) * 1988-06-14 1989-12-21 Kawasaki Steel Corp 中、低炭素フェロマンガンの製造方法
JPH06330227A (ja) * 1993-05-18 1994-11-29 Mizushima Goukintetsu Kk 中・低炭素フェロマンガンの製造方法及び製造装置
JP2010248536A (ja) * 2009-04-10 2010-11-04 Sumitomo Metal Ind Ltd 高Ｍｎ含有金属の製造方法

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HUNSBEDT, LEIF ET AL.: "NITRIDING OF FERROMANGANESE", 51ST ELECTRIC FURNACE CONFERENCE PROCEEDINGS, 1994, pages 129 - 136 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021532260A (ja) * 2018-07-23 2021-11-25 ポスコPosco 合金鋼の製造方法
JP7073574B2 (ja) 2018-07-23 2022-05-23 ポスコ 合金鋼の製造方法
US11549162B2 (en) 2018-07-23 2023-01-10 Posco Co., Ltd Alloy steel manufacturing method
WO2020152945A1 (fr) * 2019-01-24 2020-07-30 Ｊｆｅスチール株式会社 Procédé de production de ferromanganèse pauvre en carbone
JP2020117774A (ja) * 2019-01-24 2020-08-06 Ｊｆｅスチール株式会社 低炭素フェロマンガンの製造方法

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