WO2021177021A1 - 低炭素フェロマンガンの製造方法 - Google Patents

低炭素フェロマンガンの製造方法 Download PDF

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Publication number
WO2021177021A1
WO2021177021A1 PCT/JP2021/005689 JP2021005689W WO2021177021A1 WO 2021177021 A1 WO2021177021 A1 WO 2021177021A1 JP 2021005689 W JP2021005689 W JP 2021005689W WO 2021177021 A1 WO2021177021 A1 WO 2021177021A1
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Prior art keywords
blown
molten metal
blowing
slag
carbon ferromanganese
Prior art date
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Ceased
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PCT/JP2021/005689
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English (en)
French (fr)
Japanese (ja)
Inventor
信彦 小田
勇輔 藤井
新吾 佐藤
川畑　涼
菊池　直樹
敏生 塩田
一平 樋口
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.)
JFE Steel Corp
Mizushima Ferroalloy Co Ltd
Original Assignee
JFE Steel Corp
Mizushima Ferroalloy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp, Mizushima Ferroalloy Co Ltd filed Critical JFE Steel Corp
Priority to MYPI2022004682A priority Critical patent/MY199215A/en
Priority to JP2021520447A priority patent/JP7036993B2/ja
Priority to US17/802,389 priority patent/US12473605B2/en
Priority to KR1020227030926A priority patent/KR102776208B1/ko
Priority to EP21765152.0A priority patent/EP4116443A4/en
Publication of WO2021177021A1 publication Critical patent/WO2021177021A1/ja
Priority to ZA2022/09929A priority patent/ZA202209929B/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • 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
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C35/00—Master alloys for iron or steel
    • C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for producing low carbon ferromanganese.
  • the manganese (Mn) component which is useful as an alloy component of steel products, is added at the end of converter refining in the case of the converter steelmaking method using blast furnace hot metal as the main raw material.
  • the electric furnace steelmaking method using scrap as the main raw material it is added at the time of melting work.
  • a ferromanganese (FeMn) alloy is generally used as the manganese component.
  • This ferromanganese alloy is classified into high carbon ferromanganese (HCFemn), medium carbon ferromanganese (MCFemn), and low carbon ferromanganese (LCFemn) according to the carbon concentration contained, and its chemical composition is defined by the Japanese Industrial Standards (JIS). (See Table 1). Since MCFemn and LCFemn are usually produced by using an expensive silicon manganese (SiMn) alloy and a large amount of electric power, they are ferroalloys that are much more expensive than HCFemn.
  • HCFemn high carbon ferromanganese
  • MCFemn medium carbon ferromanganese
  • LCFemn low carbon ferromanganese
  • desiliconization method a silicon-manganese molten metal having a target carbon content is prepared in an electric furnace or the like, and then manganese oxide such as manganese ore is added to the molten metal to oxidize and remove silicon in the silicon-manganese molten metal. be.
  • This method has a problem that the electric power cost increases because the electric furnace is used.
  • K (a Mn ⁇ P CO ) / (a MnO ⁇ a C ) ⁇ ⁇ ⁇ (2)
  • the notation (R) means that the component of the chemical formula R is in the slag
  • the notation of [M] means that the component of the element M is in the molten ferromanganese
  • a i is the component i.
  • the activity, P j is the partial pressure (atm) of the component j.
  • the values of the equilibrium constants K, a Mn , and a C can be calculated using the thermodynamic data of known literature.
  • the decarburization limit of the ferromanganese molten metal can be known by obtaining the relationship between the equilibrium [C] concentration in the molten metal and the molten metal temperature under the conditions of the following equations (3) and (4).
  • a MnO 1 ... (3)
  • P is the total pressure (1 atm)
  • P Mn is equal to the vapor pressure of Mn at that temperature.
  • atm is a unit of pressure
  • 1 atm 101325 Pa.
  • Patent Document 1 As a method of blowing oxygen gas into a high carbon ferromanganese molten metal to blow it, in Patent Document 1 and Patent Document 2, oxygen gas is blown into the high carbon ferromanganese molten metal from the bottom tuyere of the reactor. A method of oxidizing and removing carbon in the molten metal has been proposed.
  • Patent Document 3 proposes a method of oxidizing and removing carbon in the molten metal by blowing oxygen gas from the top-blown lance while stirring the molten metal by blowing an inert gas from the bottom tuyere. There is.
  • Patent Document 4 proposes a method of blowing oxygen gas from a furnace bottom tuyere to decarburize a high-carbon ferromanganese molten metal by mixing oxygen gas with water vapor and an inert gas in a low coal region. Has been done.
  • Patent Document 5 oxygen gas and an inert gas are mixed and blown from the bottom tuyere to stir the molten metal, and oxygen gas is blown from the top blown lance to decarburize the molten metal of high carbon ferromanganese.
  • a method of reducing the bottom-blown oxygen flow rate and the bottom-blown inert gas flow rate as the smelting progresses has been proposed.
  • Patent Document 6 and Patent Document 7 propose a method in which an inert gas is mixed with top-blown oxygen and sprayed.
  • Patent Document 8 and Patent Document 9 propose a method of controlling the slag composition by adding a slag-forming agent.
  • a slag-forming agent By controlling the slag composition using manganese oxide such as manganese ore and manganese sintered ore so that the activity of MnO in the slag becomes close to 1 during blowing, the Mn yield is improved. be.
  • Patent Documents 1 to 3 have the following problems. That is, in general, manganese has a strong affinity for oxygen and is easily oxidized by oxygen gas to form slag, and since the vapor pressure is high, evaporation becomes active as the molten metal temperature rises, and manganese scatters outside the system as fume dust. It tends to be easy. Therefore, with these technologies, not only is it difficult to decarburize by simply blowing or blowing oxygen gas into the molten metal, but also the yield of Mn is reduced, resulting in medium- and low-carbon ferromanganese. There was a problem that it could not be manufactured economically.
  • Patent Documents 4 to 9 also has the following problems to be solved.
  • high-temperature blowing is performed for decarburization and refining of molten ferromanganese.
  • the method of mixing an inert gas with the top-blown oxygen gas and spraying it onto the ferromanganese molten metal is a fire point (top-blown oxygen gas), which is a site where decarburization is likely to occur at the highest temperature.
  • top-blown oxygen gas top-blown oxygen gas
  • the position where it collides with the molten metal surface will be cooled by the inert gas, and since it is thought that manganese vapor is originally generated at the fire point and the CO partial pressure is lowered, the inert gas is used. The effect of lowering the CO partial pressure is small.
  • an object of the present invention is to blow an oxidizing gas from a molten ferromanganese in a converter type reaction vessel.
  • the purpose of the present invention is to propose a method for producing low carbon ferromanganese that can enjoy a high Mn yield when decarburizing.
  • oxidizing gas is blown from the top-blown slag onto the bath surface of the high-carbon ferromanganese molten metal contained in the reaction vessel provided with the top-blown lance and the bottom-blown tuyere to decarburize.
  • the slag composition is such that the value of (CaO + MgO) / (Al 2 O 3 + SiO 2 ) is 0.4 or more and 5.0 or less based on the mass of the slag composition during blowing.
  • the method for producing low-carbon ferromanganese of the present invention constructed as described above also comprises. a. From the bottom blowing tuyere, the stirring gas is blown so that the stirring power density is 500 W / t or more. b. Adding an auxiliary material containing MgO before or during blowing, Is considered to be a more preferred embodiment.
  • the MnO in the slag when the ferromanganese molten metal is smelted by spraying an oxidizing gas, the MnO in the slag can be efficiently reduced by the carbon in the molten metal by optimizing the slag composition. It is possible to obtain a high Mn yield. In addition, according to the present invention, a higher Mn yield can be obtained by optimizing the stirring power density of the bottom blowing gas.
  • FIG. 1 is an example of equipment effective for carrying out the method of the present invention.
  • HCFemn high carbon ferromanganese
  • the molten high carbon ferromanganese molten metal 2 is charged into the reaction vessel 1 which is an example of the upper bottom blown converter.
  • Oxidizing gas is sprayed from the top blowing lance 3 onto the surface of the molten metal 2 in the container.
  • the oxidizing gas means a pure oxygen gas or an oxygen mixed gas.
  • the bottom blowing tuyere 4 is configured to blow a non-oxidizing gas into the molten metal 2.
  • a pipe 5 for guiding the non-oxidizing gas is connected to the bottom blowing tuyere 4. Then, in the example of FIG. 1, a flow rate control valve 8 is installed in each of the pipe 6 for guiding the non-oxidizing gas to the top blowing lance 3 and the pipe 7 for guiding the oxygen gas.
  • various additive 9s can be charged from the furnace opening.
  • a slag 10 is formed on the molten metal 2.
  • an auxiliary raw material containing MgO, ferromanganese as a coolant, or the like can be used as the additive material 9.
  • top blowing lance 3 it is preferable to use a Laval nozzle for the top blowing lance 3, and when a plurality of nozzles are used, it is preferable to arrange the top blowing lance 3 rotationally symmetrically with respect to the lance axis. Further, since the top-blown lance 3 uses a porous lance, the firing point area is wider than that of the single-hole lance, and oxygen can be efficiently supplied to the molten metal, so that the top-blown lance 3 is suitable for mass production.
  • the molten metal 2 of high-carbon ferromanganese is charged into the reaction vessel 1. Then, from before charging the molten metal 2 to during refining, a required amount of non-oxidizing gas is blown into the molten metal 2 from the bottom blowing tuyere 4 to stir the molten metal 2. After that, the top blowing lance 3 is lowered from above, and an oxidizing gas is blown onto the bath surface of the molten metal 2 to start decarburization blowing. If necessary, an auxiliary raw material containing MgO can be added before the start of blowing.
  • an oxygen mixed gas in which 30 vol% or less of a non-oxidizing gas is mixed with the oxygen gas or the oxygen gas can be used.
  • Ar is preferable as the non-oxidizing gas to be mixed.
  • the top-blown oxidizing gas is more preferably an oxygen mixed gas having a non-oxidizing gas of 10 vol% or less, and more preferably a pure oxygen gas.
  • the non-oxidizing gas blown from the bottom blowing tuyere Ar, CO or CO 2 or a mixed gas thereof may be used from the viewpoint of efficient stirring without increasing the nitrogen concentration in the molten metal. preferable.
  • the value of (CaO + MgO) / (Al 2 O 3 + SiO 2 ) is 0.4 or more and 5.0 or less based on the mass of the slag composition during blowing. Adjust the slag composition.
  • auxiliary raw materials such as alloy, quicklime and dolomite, Mn ore, blast furnace slag and the like may be appropriately added.
  • the value of (CaO + MgO) / (Al 2 O 3 + SiO 2 ) is smaller than 0.4 or larger than 5.0, the solid phase ratio of the slag 10 increases.
  • the viscosity of the slag increases and the fluidity of the slag decreases, which is not preferable because MnO in the slag 10 cannot be efficiently reduced into the molten metal.
  • a more preferable lower limit is 1.0 or more, and a more preferable upper limit is 3.0 or less.
  • the slag composition during slag is the composition at the time when the slag is sufficiently slag, and can be confirmed by the analysis at the end of slag.
  • the activity a MnO of MnO can be kept high, and the activity a MnO in the slag 10 can be maintained at a high level. MnO can be reduced into the molten metal with higher efficiency.
  • the upper limit is not particularly limited, but is less than 1.0.
  • the feathers in the molten metal 2 are winged under the condition that the stirring power density ⁇ of the molten metal 2 represented by the following equation (5) is 500 W / t or more. It is preferable to supply the bottom blowing gas from the mouth 4. This is because the slag-metal reaction can be promoted and the Mn oxide (MnO) in the slag 10 can be recovered in the molten metal by stirring the molten metal at an appropriate stirring power density. More preferably, the stirring power density is 600 W / t or more.
  • ⁇ 6.183 ⁇ (Q ⁇ T l / (60 ⁇ W )) ⁇ [ln ⁇ 1 + h / (1.02 ⁇ 10 -4 ⁇ (101325 ⁇ P)) ⁇ + ⁇ 1- (T g / T l) ) ⁇ ] ⁇ ⁇ ⁇ ⁇ (5)
  • ⁇ bottom blowing gas stirring power density (W / t)
  • Q bottom blowing gas flow rate (Nm 3 / h)
  • W ferromanganese molten metal amount (t)
  • T l ferromanganese molten metal temperature (° C.).
  • T g bottom blowing gas temperature (° C.)
  • h bath depth (distance from the stationary bath surface to the bottom of the reaction vessel) (m)
  • P atmospheric pressure (1 atm).
  • the oxidizing gas is blown from the top blowing lance 3 so that the flow velocity at the time of reaching the bath surface calculated by the following formulas (6) to (9) is 70 m / s or more and 150 m / s or less. Is preferable. The reason is that by operating within this range, oxygen can be blown without being blocked by Mn steam (fume) and while suppressing the scattering of molten metal, so that the decarboxylation efficiency is improved. This is because a high Mn yield can be obtained. More preferably, the flow rate at the time of reaching the bath surface is in the range of 80 m / s or more and 130 m / s or less.
  • P 0 on lance nozzle before the pressure of the oxidizing gas (atm)
  • P e the outlet pressure (atm)
  • U 0 release speed of the oxidizing gas from the top lance (m / s)
  • U Flow velocity (m / s) when the oxidizing gas reaches the bath surface from the top blown lance
  • L Lance height (distance from the nozzle outlet of the top blown lance to the bath surface at rest) (mm)
  • D Top blown Nozzle outlet diameter (mm) of the lance
  • C A constant number (-) representing the spread of a jet of oxidizing gas.
  • the ferromanganese molten metal temperature T l is 1700 ° C. or less when the carbon concentration in the molten metal [C]: 2.0 mass% or more.
  • [C] It is desirable to operate at 1750 ° C. or lower when the temperature is 1.5 mass% or more and less than 2.0 mass%.
  • auxiliary raw materials such as alloys, quicklime and dolomite, Mn ore, slag and the like as the coolant 9 as necessary during this decarburization refining. ..
  • auxiliary raw material containing MgO examples include magnesite (a substance obtained by firing dolomite or magnesite and crushing it and then hardening it with cement or the like) or magnesite (a mineral mainly composed of magnesium carbonate).
  • the above-mentioned top blowing lance 3 is raised to stop the blowing of the oxidizing gas. Further, after the top-blown lance 3 is raised, it is preferable to add a reducing agent such as FeSi or Simn while stirring with the bottom-blown gas to reduce and recover the oxidized Mn (MnO) in the slag.
  • a reducing agent such as FeSi or Simn
  • This example is an example in which 25 tons of molten metal of high carbon ferromanganese (HCFemn) is charged into a cylindrical top-bottom blowing type smelting furnace having an inner diameter of about 2.3 m, and decarburization smelting is performed.
  • the HCFeMn used here corresponded to No. 2 (Mn: 73 mass%, C: 6.9 mass%) shown in Table 1, and the temperature immediately after charging was 1334 to 1341 ° C.
  • Ar was blown from the bottom blowing tuyere, and while stirring the molten metal, pure O 2 was blown from the top blowing lance.
  • the oxygen supply rate was 40 Nm 3 / min from the start to the end of refining.
  • Mn yield W 1 / (W 2 + W 3 + W 4 ) ⁇ 100 ⁇ ⁇ ⁇ (10)
  • ⁇ Mn Mn yield (%)
  • W 1 Mn mass (kg) in the product FeMn
  • W 2 Mn mass (kg) in the HCFeMn molten metal
  • W 3 Mn mass added as the Mn-containing alloy.
  • the stirring power density ⁇ of the bottom blowing gas is at a level of 500 W / t or more (treatment Nos. 9, 20 and 21).
  • the Mn yield ⁇ Mn was higher than the level at which the stirring power density ⁇ was less than 500 W / t (treatment No. 19). It is considered that this is because the slag-metal reaction was promoted and the Mn oxide in the slag could be efficiently reduced and recovered by stirring the molten metal with an appropriate stirring power density ⁇ .

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  • Engineering & Computer Science (AREA)
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  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
PCT/JP2021/005689 2020-03-06 2021-02-16 低炭素フェロマンガンの製造方法 Ceased WO2021177021A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
MYPI2022004682A MY199215A (en) 2020-03-06 2021-02-16 Method for producing low-carbon ferromanganese
JP2021520447A JP7036993B2 (ja) 2020-03-06 2021-02-16 低炭素フェロマンガンの製造方法
US17/802,389 US12473605B2 (en) 2020-03-06 2021-02-16 Method for producing low-carbon ferromanganese
KR1020227030926A KR102776208B1 (ko) 2020-03-06 2021-02-16 저탄소 페로망간의 제조 방법
EP21765152.0A EP4116443A4 (en) 2020-03-06 2021-02-16 PROCESS FOR PRODUCING LOW CARBON FERROMANGANESE
ZA2022/09929A ZA202209929B (en) 2020-03-06 2022-09-06 Method for producing low-carbon ferromanganese

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JP2020-038790 2020-03-06
JP2020038790 2020-03-06

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US (1) US12473605B2 (https=)
EP (1) EP4116443A4 (https=)
JP (1) JP7036993B2 (https=)
KR (1) KR102776208B1 (https=)
MY (1) MY199215A (https=)
WO (1) WO2021177021A1 (https=)
ZA (1) ZA202209929B (https=)

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JPS529616A (en) 1975-07-11 1977-01-25 Elektrometallurgie Gmbh Decarburizing of high carbon ferro mangan mangan or high carbon ferro chrom
JPS5497521A (en) 1978-01-17 1979-08-01 Creusot Loire Refining of ferromanganese
JPS6056051A (ja) 1983-09-06 1985-04-01 Japan Metals & Chem Co Ltd 中・低炭素フエロマンガンの製造方法
JPS61291947A (ja) 1985-06-18 1986-12-22 Kawasaki Steel Corp 中炭素または低炭素フェロマンガンの製造方法
US4662937A (en) * 1984-05-28 1987-05-05 Nippon Steel Corporation Process for production of high-manganese iron alloy by smelting reduction
JPS62230951A (ja) 1986-03-31 1987-10-09 Kobe Steel Ltd 中・低炭素フエロマンガンの製造方法
JPS63290242A (ja) * 1987-03-11 1988-11-28 ティッセン　シュタール　アクチェンゲゼルシャフト 低炭素低シリコンフェロマンガンの製造方法およびその実施のための転炉およびランス
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
JPH02166256A (ja) 1988-12-21 1990-06-26 Kawasaki Steel Corp 中・低炭素フェロマンガンの溶製方法
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JPH11279630A (ja) * 1998-03-26 1999-10-12 Kawasaki Steel Corp 高清浄度鋼の溶製方法
JPH11293332A (ja) 1998-04-10 1999-10-26 Kawasaki Steel Corp フェロマンガン溶湯の脱炭精錬方法
JP2008240126A (ja) * 2007-03-28 2008-10-09 Jfe Steel Kk ステンレス溶鋼の精錬方法

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US4165980A (en) * 1972-01-13 1979-08-28 Gfe Gesellschaft Fur Elektrometallurgie Mit Beschrankter Haftung Method of rapidly decarburizing ferro- alloys with oxygen
US4130417A (en) 1975-07-11 1978-12-19 Gfe Gesellschaft Fur Elektrometallurgie Mit Beschrankter Haftung Process for refining high-carbon ferro-alloys
JPS5620113A (en) 1979-07-30 1981-02-25 Nippon Steel Corp Operating method of converter
JPS6067608A (ja) 1983-09-22 1985-04-18 Japan Metals & Chem Co Ltd 中・低炭素フエロマンガンの製造方法
JPH01123047A (ja) 1987-11-06 1989-05-16 Kawasaki Steel Corp 合金鉄の精錬方法
JP2021028404A (ja) * 2017-11-27 2021-02-25 水島合金鉄株式会社 中低炭素フェロマンガンの製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4879716A (https=) 1972-01-13 1973-10-25
JPS529616A (en) 1975-07-11 1977-01-25 Elektrometallurgie Gmbh Decarburizing of high carbon ferro mangan mangan or high carbon ferro chrom
JPS5497521A (en) 1978-01-17 1979-08-01 Creusot Loire Refining of ferromanganese
JPS6056051A (ja) 1983-09-06 1985-04-01 Japan Metals & Chem Co Ltd 中・低炭素フエロマンガンの製造方法
US4662937A (en) * 1984-05-28 1987-05-05 Nippon Steel Corporation Process for production of high-manganese iron alloy by smelting reduction
JPS61291947A (ja) 1985-06-18 1986-12-22 Kawasaki Steel Corp 中炭素または低炭素フェロマンガンの製造方法
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