WO2018216660A1 - Procédé de fabrication d'un lingot d'acier à haute teneur en manganèse - Google Patents

Procédé de fabrication d'un lingot d'acier à haute teneur en manganèse Download PDF

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WO2018216660A1
WO2018216660A1 PCT/JP2018/019526 JP2018019526W WO2018216660A1 WO 2018216660 A1 WO2018216660 A1 WO 2018216660A1 JP 2018019526 W JP2018019526 W JP 2018019526W WO 2018216660 A1 WO2018216660 A1 WO 2018216660A1
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manganese
steel
molten metal
molten steel
concentration
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PCT/JP2018/019526
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English (en)
Japanese (ja)
Inventor
勇輔 藤井
中井　由枝
信彦 小田
太 小笠原
菊池　直樹
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Ｊｆｅスチール株式会社
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Priority to CN201880032038.3A priority Critical patent/CN110621793A/zh
Priority to JP2019506740A priority patent/JP6551626B2/ja
Priority to EP18806216.0A priority patent/EP3633051B1/fr
Priority to KR1020197033815A priority patent/KR102315999B1/ko
Publication of WO2018216660A1 publication Critical patent/WO2018216660A1/fr

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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
    • C21C1/00—Refining of pig-iron; Cast iron
    • 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
    • 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
    • C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21C7/10—Handling in a vacuum

Definitions

  • the present invention relates to a method for melting high manganese steel.
  • Manganese has the advantage of improving the strength of the steel material by adding it to the steel. Manganese also has the advantage of reacting with sulfur remaining in the steel as an inevitable impurity to form MnS, preventing the formation of harmful FeS and suppressing the influence of sulfur in the steel material. For this reason, most of the steel material contains manganese. In recent years, low-carbon and high-manganese steels with low carbon content and high manganese content that have both high tensile strength and high workability have been developed to reduce the weight of structures. Widely used as steel plates and automotive steel plates.
  • manganese sources used for adjusting the manganese concentration in molten steel include manganese ore, high carbon ferromanganese (carbon content: 7.5 mass% or less), medium carbon ferromanganese (carbon content: 2). 0.0 mass%), low carbon ferromanganese (carbon content: 1.0 mass% or less), silicomanganese (carbon content: 2.0 mass% or less), metal manganese (carbon content: 0.01 mass%) % Or less) is generally used.
  • these manganese sources become expensive as the carbon content decreases, except for manganese ore. Therefore, for the purpose of reducing the manufacturing cost, a method for melting manganese-containing steel using manganese ore or high carbon ferromanganese, which is an inexpensive manganese source, has been proposed.
  • Patent Document 1 as a method of melting high manganese steel, the carbon concentration is 1. when the steel is discharged to a ladle after rinsing with a bottom blowing gas after the completion of the converter blowing.
  • high-carbon ferromanganese of 0% by mass or more is introduced, aluminum is introduced, deoxidation treatment is performed, and then RH gas degassing treatment is performed.
  • Patent Document 2 as a method for melting high manganese steel, manganese ore is used to decarburize and refine hot metal while reducing manganese ore, and after decarburization is finished, deoxidation of molten steel with aluminum is performed.
  • JP 2013-112855 A Japanese Patent No. 4534734 Japanese Patent Laid-Open No. 5-125428
  • the present invention has been made paying attention to the above-mentioned problems, and when producing a high manganese steel containing 5 mass% or more of manganese, a high manganese yield can be obtained, and a high efficiency can be obtained. It aims at providing the manufacturing method of the high manganese steel which can be manufactured.
  • the hot metal is decarburized in the converter to make the hot metal a molten steel with a low carbon concentration.
  • the decarburization step and the decarburization step by adding a manganese source and a silicon source to the molten steel accommodated in the converter, after the reduction step of reducing the molten steel, after the reduction step, A degassing step of vacuum degassing the molten steel with a vacuum degassing device, and in the reduction step, the silicon source so as to satisfy the formula (1) according to the amount of the manganese source added.
  • x Mn Manganese concentration in the manganese source (mass%)
  • xSi silicon concentration (mass%) in the silicon source
  • W Mn Amount of manganese source added (kg / t)
  • W Si Amount of silicon source added (kg / t)
  • a high manganese steel that can provide a high manganese yield and can be smelted with high efficiency when melting high manganese steel containing 5 mass% or more of manganese.
  • a melting method is provided.
  • the decarburization process which decarburizes the molten metal 2 (it is also called "molten iron") which is the molten metal accommodated in the converter 1 is performed (S100).
  • the molten metal 2 is molten iron discharged from the blast furnace, and after being discharged from the blast furnace, it is transferred to a steelmaking factory as a next process in a transfer container that can store molten iron such as a hot metal ladle or a torpedo car.
  • a dephosphorization process for reducing the phosphorus concentration of the hot metal is performed before charging the hot metal into the converter 1. preferable.
  • an oxygen source such as solid oxygen such as iron oxide or gaseous oxygen and a medium solvent containing lime are added to the hot metal contained in the hot metal transfer container, and the hot metal becomes gaseous oxygen or a gas for stirring.
  • the dephosphorization reaction proceeds as a result of stirring.
  • the phosphorus concentration of the hot metal is lower than the upper limit concentration of the final component standard of the high manganese steel.
  • the phosphorus concentration in the hot metal is 0.05 mass above the upper limit of the component standard. It is more preferable to carry out the dephosphorization treatment until it becomes about%, and then remove the slag generated by the treatment (also referred to as “removing”). Furthermore, in order to lower the phosphorus concentration of the hot metal below the upper limit of the component standard, desiliconization is performed before dephosphorization, and silicon that inhibits efficient dephosphorization reaction is removed in advance. Is preferred.
  • the molten metal 2 that is the molten iron conveyed in the conveying container is transferred to the molten iron ladle and then charged into the converter 1 that is the primary refining furnace.
  • scrap serving as an iron source may be charged into the furnace body 10.
  • the converter 1 is a conventional converter facility, and includes a furnace body 10, an upper blowing lance 11, a plurality of bottom blowing nozzles 12, and a chute 13, as shown in FIG.
  • the furnace body 10 is a barrel-type or pear-type refining furnace having a furnace port as an opening at the top, and a refractory is provided inside.
  • the upper blowing lance 11 is disposed above the furnace body 10 and configured to be movable up and down in the vertical direction (up and down direction in FIG. 2).
  • a plurality of nozzle holes are formed at the lower end of the upper blowing lance 11, and the molten metal 2 in which the oxidizing gas containing at least oxygen supplied from a supply facility (not shown) is accommodated in the furnace body 10 from the plurality of nozzle holes.
  • the plurality of bottom blowing nozzles 12 are provided at the bottom of the furnace body 10, and agitation gas that is an inert gas such as argon or nitrogen supplied from a supply device (not shown) is blown into the molten metal 2 accommodated in the furnace body 10.
  • agitation gas that is an inert gas such as argon or nitrogen supplied from a supply device (not shown) is blown into the molten metal 2 accommodated in the furnace body 10.
  • the chute 13 is arranged above the furnace body 10, connected to a plurality of unillustrated furnace hoppers for storing various auxiliary materials such as lime-containing medium solvent and alloyed iron, and auxiliary materials cut out from each furnace hopper. Is added into the furnace body 10.
  • oxidizing gas is injected from the top blowing lance 11 into the molten metal 2 (also referred to as “acid feeding”) while stirring the molten metal 2 accommodated in the furnace body 10 with the stirring gas blown from the bottom blowing nozzle 12.
  • decarburization treatment also referred to as “decarburization blowing”
  • the decarburization reaction proceeds by the oxygen blown into the molten metal 2 by the top blowing lance 11 and the carbon in the molten metal 2 reacting.
  • an auxiliary raw material such as alloy iron containing Cr or Ni is added to the chute 13. Is added to the molten metal 2.
  • decarburization blowing is performed until the carbon concentration of the molten metal 2 falls within a predetermined range, and the molten metal 2 is changed from molten iron having a high carbon concentration to molten steel having a low carbon concentration.
  • the predetermined range of the carbon concentration is preferably 0.05% by mass or more and 0.2% by mass or less.
  • a manganese source and a silicon source are added into the furnace body 10 in which the molten metal 2 is accommodated, and a reduction step is performed in which the molten metal 2 that is molten steel is reduced (S102).
  • Manganese sources are ores, alloys and metals containing manganese.
  • the manganese source for example, manganese ore, high carbon ferromanganese, medium carbon ferromanganese, low carbon ferromanganese, silicomanganese, metal manganese, and the like can be used.
  • the silicon source is an ore, an alloy, or a metal containing silicon (silicon).
  • the silicon source for example, ferrosilicon or silicomanganese can be used.
  • the manganese source and the silicon source may be added from the furnace port via the chute 13 or may be added from the furnace port of the furnace body 10 using a scrap chute (not shown) used for charging the scrap. Good. Further, when adding the manganese source and the silicon source, the molten metal 2 is added while being stirred by blowing a stirring gas from the plurality of bottom blowing nozzles 12.
  • the manganese source is added in an amount corresponding to the target manganese concentration, which is a component standard of high manganese steel. That is, the addition amount of the manganese source is determined by the manganese content of the manganese source, the carbon concentration of the molten metal 2 and the like according to the target manganese concentration. At this time, the record of the yield of the manganese source may be considered. In the reduction process, it is not necessary to set the manganese concentration of the molten metal 2 to a target concentration, and the manganese concentration of the molten metal 2 is set to a lower concentration than the target concentration so that it can be adjusted in the degassing step described later. May be.
  • the addition amount of the manganese source in the reduction step is preferable to increase the addition amount of the manganese source in the reduction step as much as possible relative to the addition amount of the manganese source in the degassing step. Furthermore, from the viewpoint of reducing the cost for processing, it is preferable to use manganese ore or an inexpensive manganese source with a high carbon concentration as much as possible, as long as there is no effect on the adjustment of components other than manganese such as carbon.
  • the silicon source is added in an addition amount that satisfies the following formula (1).
  • x Mn is the manganese concentration (mass%) in the manganese source
  • x Si is the silicon concentration (mass%) in the silicon source
  • WMn is the added amount of the manganese source (kg / t)
  • W Si Indicates the added amount (kg / t) of the silicon source. That is, the silicon source is added in an amount corresponding to the added amount of the manganese source to be added.
  • the stirring gas is blown from the plurality of bottom blowing nozzles 12, and the molten metal 2 is stirred for a predetermined time.
  • the molten metal 2 after the decarburization step has a high oxygen potential, when a manganese source is added to the molten metal 2, manganese in the manganese source is oxidized and not oxidized in the molten metal 2, and manganese oxide (MnO ) And included in the slag 3.
  • the silicon source is added in addition to the manganese source, manganese in the manganese source and manganese oxide in the slag 3 generated by the decarburization process are reduced by the reaction represented by the following formula (2).
  • the manganese concentration of the molten metal 2 becomes high.
  • the oxygen potential of the molten metal 2 is lowered by preferentially oxidizing silicon in the silicon source.
  • the addition amount of the silicon source is lower than the range of the formula (1), that is, when the addition amount of the silicon source is small, the reduction reaction of manganese oxide does not proceed, so the manganese concentration of the molten metal 2 may be increased. become unable.
  • the addition amount of the silicon source becomes higher than the range of the formula (1), that is, when the addition amount of the silicon source is large, the addition amount of lime for adjusting the basicity becomes too large. The cost is high.
  • the silicon concentration of the molten metal 2 becomes high and may exceed the upper limit of a component specification value. In such a case, it is necessary to perform a silicon removal treatment for reducing the silicon concentration of the molten metal 2 in the next step, which is not preferable.
  • the molten metal 2 of the furnace body 10 is transferred to the ladle (also referred to as “tapping steel”).
  • the ladle also referred to as “tapping steel”.
  • lime of 5 kg / t or more and 10 kg / t or less is previously placed in the pan in an amount per 1 t of the molten metal.
  • Preliminary lime in the ladle can prevent the generation of white smoke at the time of steelmaking and suppress the increase in the sulfur concentration of the molten metal 2 due to the sulfurization from the slag 3.
  • the vacuum degassing apparatus 5 performs a vacuum degassing process on the molten metal 2 that is molten steel (S104).
  • the vacuum degassing device 5 is a VOD type degassing device, and performs degassing processing by stirring the molten metal 2 accommodated in the ladle 4 under reduced pressure.
  • the vacuum degassing apparatus 5 includes a vacuum chamber 50, an exhaust pipe 51, a stirring gas supply path 52, an upper blowing lance 53, and a supply port 54.
  • the vacuum chamber 50 is a container that can accommodate the ladle 4 therein, and has a detachable upper lid 500 so that the ladle 4 can be taken in and out.
  • the exhaust pipe 51 is provided on the side surface of the vacuum chamber 50 and is connected to an exhaust device (not shown).
  • the stirring gas supply path 52 is arranged from the outside to the inside of the vacuum chamber 50, and the tip on the inner side of the vacuum chamber 50 is connected to the blowing port 40 of the ladle 4.
  • the stirring gas supply path 52 is connected to a stirring gas supply device (not shown) at the inner end of the vacuum chamber 50, and a stirring gas such as argon gas supplied from the stirring gas supply device is blown into the inlet of the ladle 4. 40.
  • the upper blowing lance 53 is inserted into the center of the upper lid 500 and is configured to be able to move up and down in the vertical direction (vertical direction in FIG. 3).
  • the upper blowing lance 53 has a nozzle hole formed at the lower end, and an oxidizing gas containing at least oxygen supplied from a supply facility (not shown) is supplied from the nozzle hole to the molten metal 2 accommodated in the ladle 4.
  • the supply port 54 is formed in the upper lid 500 and is connected to a plurality of furnace hoppers (not shown) that store various auxiliary materials such as a solvate containing lime and iron alloy, and takes out the auxiliary materials cut out from each of the furnace hoppers. It is an inlet for adding to the molten metal 2 accommodated in the pan 4.
  • the molten gas 2 is stirred by blowing the stirring gas from the blowing port 40, and then the exhaust pipe 51 is evacuated using the exhaust device.
  • Vacuum degassing treatment is performed by reducing the pressure in the chamber 50.
  • the auxiliary component for component adjustment is set so as to be within the target component range according to the components of the molten metal 2 before or during the vacuum degassing process.
  • the raw material is added to the molten metal 2 through the supply port 54.
  • the amount of manganese source such as metal manganese, high carbon ferromanganese, low carbon ferromanganese, etc. necessary for component adjustment Only add to molten metal 2.
  • auxiliary materials containing each component are added to the molten metal 2.
  • secondary materials used for adjusting the composition of slag 3 and promoting desulfurization reaction such as CaO-containing material, MgO-containing material, aluminum-containing material, Al 2 O 3 -containing material, SiO 2 -containing material May be added to the molten metal 2.
  • the stirring power ⁇ (W / t) represented by the following formula (4) is 300 W / t or more and 1300 W / t or less.
  • the stirring power ⁇ is less than 300 W / t, the stirring power becomes small, so that it takes time for the denitrification process and the dehydrogenation process, and the processing time for the vacuum degassing process is extended, which is not preferable.
  • the stirring power ⁇ is larger than 1300 W / t, the amount of slag 3 entrapped in the molten metal 2 increases, and the defect rate due to slag inclusions increases, which is not preferable.
  • Q n is the flow rate of the stirring gas (Nm 3 / min)
  • T l is the temperature (K) of the molten metal 2
  • W m is the weight (t) of the molten metal 2
  • ⁇ l is the molten metal 2 Density (kg / m 3 )
  • h is the height of the molten metal surface (m) which is the depth of the molten metal 2 in the ladle 4
  • P 1 is the atmospheric pressure (Torr)
  • ⁇ is the energy transfer efficiency ( ⁇ )
  • T n Indicates the temperature (K) of the stirring gas.
  • One Torr is (101325/760) Pa.
  • a temperature increasing process for raising the temperature of the molten metal 2 may be performed during the vacuum degassing process.
  • an oxidizing gas containing oxygen is injected from the upper blowing lance 53 onto the molten metal 2.
  • the dynamic pressure P (kPa) of the oxidizing gas jet injected from the top blowing lance 53 is 10 kPa or more and 50 kPa or less. It is preferable to control as described above. By controlling the dynamic pressure P within the above range, the molten metal 2 can be efficiently heated while minimizing the evaporation of manganese from the molten metal 2.
  • ⁇ g is the density of the oxidizing gas (kg / Nm 3 )
  • U is the flow velocity (m / sec) of the oxidizing gas jetted from the nozzle of the top blowing lance 53 at the nozzle tip.
  • F represents the flow rate of the oxidizing gas (Nm 3 / h)
  • S represents the cross-sectional area (m 2 ) of the nozzle of the top blowing lance 53.
  • molten steel with a predetermined target component concentration is produced.
  • a molten slab or the like is continuously cast to produce a high-manganese steel slab having a predetermined shape such as a slab.
  • the vacuum degassing apparatus 5 is a VOD type refining apparatus, but the present invention is not limited to such an example.
  • the vacuum degassing device 5 may be an RH degassing device or a DH degassing device.
  • the vacuum degassing apparatus is an RH type degassing apparatus, in order to suppress the evaporation of manganese, the molten steel represented by the following formula (7) is used under the condition that the space pressure in the vacuum tank is 50 Torr to 100 Torr.
  • the reflux amount Q (t / min) is preferably 150 t / min or more and 200 t / min or less.
  • the treatment may be performed at a tank internal pressure of less than 50 Torr, but after the denitrification and dehydrogenation, the treatment is performed at a tank internal pressure of 50 Torr or more and 100 Torr or less. It is preferable to carry out.
  • K is a constant
  • G is the flow rate (NL / min) of the recirculation gas blown from the dip tube
  • D is the inner diameter (m) of the dip tube
  • P 2 is the external pressure (Torr)
  • P Reference numeral 3 represents the internal space pressure (Torr) of the vacuum chamber.
  • the molten metal 2 which is the molten steel manufactured with the converter 1 was used as the molten metal 2 processed with the vacuum degassing apparatus 5, this invention is not limited to this example.
  • the molten steel manufactured in the converter 1 may be used as the molten metal 2 to be processed by the vacuum degassing device 5 by combining the molten steel melted in another refining furnace.
  • the manganese concentration of the molten steel manufactured by the converter 1 can be lowered by increasing the manganese concentration of the molten steel melted in another refining furnace.
  • the manganese gas and the silicon source are added to the reduction step, and then the stirring gas is blown from the plurality of bottom blowing nozzles 12 to stir the molten metal 2 for a predetermined time.
  • the stirring gas is blown from the plurality of bottom blowing nozzles 12 to stir the molten metal 2 for a predetermined time.
  • oxidizing gas from the top blowing lance 11 may be injected in addition to blowing the stirring gas.
  • the heat treatment may be performed by an oxidation reaction with an oxidizing gas.
  • dephosphorization processing was performed to hot metal before decarburization processing
  • this invention is not limited to this example.
  • a desulfurization treatment for reducing the sulfur concentration in the hot metal may be performed before the dephosphorization process or after the dephosphorization process depending on the equipment configuration.
  • the dephosphorization process was performed with respect to the hot metal accommodated in the hot metal conveyance container, this invention is not limited to this example.
  • the dephosphorization treatment may be, for example, a method of performing treatment by injecting an oxidizing gas from an upper blowing lance to hot metal accommodated in a converter type refining furnace.
  • the method for melting high manganese steel is to decarburize hot metal (molten metal 2) in converter 1 when melting steel containing 5 mass% or more of manganese.
  • a manganese source and a silicon source to the molten steel housed in the converter 1 after the decarburization step (step S100) in which the molten iron has a low carbon concentration (molten metal 2) and the decarburization step
  • a reduction process for reducing the molten steel
  • a degassing process (Step S104) for performing a vacuum degassing process on the molten steel in the vacuum degassing apparatus 5 after the reduction process
  • a manganese source is added according to the target manganese concentration of the steel, and a silicon source is added so as to satisfy equation (1).
  • the reduction reaction of the formula (2) can be promoted, manganese in the added manganese source can be easily retained in the molten metal 2. Further, since the manganese source is added in the converter 1, heat loss (decrease in the temperature of the molten metal 2) due to the addition of the manganese source can be suppressed. Furthermore, since the molten metal 2 can be subjected to a heat treatment in the converter 1 after the addition of the manganese source, the heat treatment can be efficiently performed. Furthermore, it is possible to suppress the addition of an excessive silicon source more than an amount sufficient for promoting the reduction reaction, and it is not necessary to perform a desiliconization process in the degassing process. Can do.
  • the vacuum degassing device 5 As the vacuum degassing device 5, a device for stirring the molten steel by blowing a stirring gas from the bottom of the ladle containing the molten steel is used.
  • the vacuum degassing process is performed while stirring the molten steel under the condition that the stirring power ⁇ represented by the above is 300 W / t or more and 1300 W / t or less.
  • the time required for the denitrification process and the dehydrogenation process can be shortened, and further, the slag 3 can be prevented from being caught in the molten metal 2. For this reason, the processing time of a vacuum degassing process can be shortened.
  • Example 1 performed by the present inventors will be described.
  • the hot metal discharged from the blast furnace was subjected to hot metal pretreatment of desiliconization treatment and dephosphorization treatment, so that the phosphorus concentration was 0.010% by mass.
  • a high manganese steel having a manganese concentration of 5% by mass or more was melted by performing a decarburization process, a reduction process, and a degassing process on the hot metal.
  • the components of the molten high manganese steel are as follows: carbon concentration: 0.145 mass% to 0.155 mass%, manganese concentration: 24 mass% to 25 mass%, silicon concentration: 0.1 mass% or more It was 0.2 mass% or less, sulfur concentration: 0.002 mass% or less, nitrogen concentration: 100 ppm or less, and hydrogen concentration: 5 ppm or less.
  • the molten metal 2 that has been subjected to the hot metal pretreatment is decarburized, and decarburized and blown until the carbon concentration reaches 0.05% by mass to obtain molten steel. .
  • the reduction step high-carbon ferromanganese and metal manganese were added as a manganese source to molten metal 2 that was a decarburized molten steel, and ferrosilicon was added as a silicon source. Then, while stirring the molten metal 2 with the stirring gas, the acid supply from the top blowing lance 11 was continued and the reduction treatment was performed to dissolve the manganese source and increase the manganese concentration of the molten metal 2.
  • the addition amount of the silicon source satisfies the formula (1).
  • lime was added together with the manganese source.
  • the manganese concentration of the molten metal 2 at the end of the reduction treatment was approximately 24% by mass.
  • about 0.8 kg of metal aluminum was added per ton of molten steel to the molten metal 2 to be tapped. .
  • the degassing process was performed on the molten metal 2 that was 150 tons of molten steel that had undergone the reduction step, using the VOD type vacuum degassing device 5 as in the above embodiment.
  • degassing was performed by blowing the Ar gas at a flow rate of 2000 Nl / min into the molten metal 2 from the inlet 40 of the ladle 4 and stirring the molten metal 2 while setting the internal space pressure of the vacuum chamber 50 to 2 Torr.
  • metal manganese and high carbon ferromanganese were added to the molten metal 2 during the degassing process to adjust the components.
  • Example 1 shows the amount of silicon source added in the reduction step, the Mn yield, the silicon concentration of the molten metal 2 during steel output, and the time required for the degassing process in the degassing step as the results of Example 1.
  • the Mn yield in Table 1 indicates how much manganese contained in the manganese source used in the reduction process was added to the molten metal 2, that is, the manganese content in the manganese source was that of the molten metal 2 before and after the reduction process. It shows how much it contributed to the increase in manganese concentration.
  • the silicon contained in the molten metal 2 is oxidized and removed by injecting an oxidizing gas from the top blowing lance 53 onto the molten metal 2.
  • an oxidizing gas from the top blowing lance 53 onto the molten metal 2.
  • Example 2 performed by the present inventors will be described.
  • high manganese steel was melted by a melting method similar to that in Example 1-4 under a plurality of conditions in which the stirring power ⁇ in the degassing step was changed.
  • the components of the molten high manganese steel are as follows: carbon concentration: 0.145 mass% to 0.155 mass%, manganese concentration: 24 mass% to 25 mass%, silicon concentration: 0.1 mass% or more It was 0.2 mass% or less, sulfur concentration: 0.002 mass% or less, nitrogen concentration: 100 ppm or less, and hydrogen concentration: 5 ppm or less.
  • the decarburization process was performed on the molten metal 2 that was the hot metal that had been subjected to the hot metal pretreatment in the converter 1, and the carbon concentration was 0.05 mass%. Until then, decarburization was blown into molten steel.
  • a reduction process similarly to Example 1-4, a 35 kg / t silicon source was added and the molten metal 2 was subjected to a reduction treatment. The manganese concentration of the molten metal 2 at the end of the reduction treatment was approximately 24% by mass.
  • the molten metal 2 was degassed by the vacuum degassing apparatus 5 as in Example 1-4. In the degassing step, the degassing process was performed under a plurality of conditions in which the stirring power ⁇ was arbitrarily changed by adjusting the flow rate of Ar gas blown from the blowing port 40 of the ladle 4.
  • Example 2 As a result of Example 2 shown in Table 2, the amount of silicon source added in the reduction process, the Mn yield, the silicon concentration of the molten metal 2 during steel output, the stirring power in the degassing process, and the time required for degassing in the degassing process Indicates.
  • Table 2 in Example 2, high manganese steel was melted under 10 conditions of Examples 2-1 to 2-10 having different stirring power in the degassing step.
  • the stirring power ⁇ in the degassing step in Example 1-4 corresponds to that in Example 2-1.
  • the other melting conditions were the same as those in Example 1-4.
  • Example 2-1 in which the stirring power ⁇ is less than 300 W / t , 2-2 and stirring power ⁇ exceeding 1300 W / t, it was confirmed that the time required for the degassing treatment was shortened compared to Examples 2-9 and 2-10. This is considered to be because dehydrogenation, denitrogenation, and floating of inclusions in the vacuum degassing process were promoted by applying an appropriate stirring power to the molten metal 2 to perform stirring.

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Abstract

L'invention concerne un procédé de fabrication de lingots d'acier à haute teneur en manganèse, qui permet de fabriquer des lingots de manière hautement efficace et d'obtenir un rendement élevé en manganèse, lors de la fabrication de lingots constitués d'un acier à haute teneur en manganèse qui comprend au moins 5 % en masse de manganèse. Ce procédé comprend, lorsque des lingots d'acier qui comprennent au moins 5 % en masse de manganèse sont fabriqués : une étape de décarburation (étape S100) pour transformer le métal chaud en acier fondu (fusion (2)) à faible concentration en carbone par un traitement de décarburation effectué sur le métal chaud (fusion (2)) dans un four convertisseur (1) ; une étape de réduction (étape S102) pour effectuer un traitement de réduction de l'acier fondu par ajout d'une source de manganèse et d'une source de silicium à l'acier fondu placé dans le four de convertisseur (1) après l'étape de décarburation ; et une étape de dégazage (étape S104) pour réaliser un traitement de dégazage sous vide sur l'acier fondu dans un dispositif de dégazage sous vide (5) après l'étape de réduction. Lors de l'étape de réduction, la source de manganèse est ajoutée en fonction de la concentration cible en manganèse de l'acier, et la source de silicium est ajoutée de manière à satisfaire l'équation (1).
PCT/JP2018/019526 2017-05-25 2018-05-21 Procédé de fabrication d'un lingot d'acier à haute teneur en manganèse WO2018216660A1 (fr)

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EP18806216.0A EP3633051B1 (fr) 2017-05-25 2018-05-21 Procédé de fabrication d'un lingot d'acier à haute teneur en manganèse
KR1020197033815A KR102315999B1 (ko) 2017-05-25 2018-05-21 고망간강의 용제 방법 및 고망간강의 제조 방법

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JPWO2018216660A1 (ja) 2019-06-27
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