CN115369205B - Converting method of low manganese steel converter - Google Patents
Converting method of low manganese steel converter Download PDFInfo
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- CN115369205B CN115369205B CN202211052417.3A CN202211052417A CN115369205B CN 115369205 B CN115369205 B CN 115369205B CN 202211052417 A CN202211052417 A CN 202211052417A CN 115369205 B CN115369205 B CN 115369205B
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 24
- 238000007664 blowing Methods 0.000 claims abstract description 90
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000010079 rubber tapping Methods 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims description 97
- 229910000831 Steel Inorganic materials 0.000 claims description 74
- 239000010959 steel Substances 0.000 claims description 74
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 44
- 229910052748 manganese Inorganic materials 0.000 claims description 38
- 239000011572 manganese Substances 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 36
- 229910052799 carbon Inorganic materials 0.000 claims description 36
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 230000004907 flux Effects 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000010459 dolomite Substances 0.000 description 6
- 229910000514 dolomite Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 208000028659 discharge Diseases 0.000 description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- 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
- C21C5/32—Blowing from above
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a blowing method of a low manganese steel converter, which comprises the following steps: 1) Calculating the demanganization rate of the converter; 2) Determining a converter converting system according to the demanganization rate S of the converter and the target mass percentage content of manganese element in tapping of the converter; the invention relates to a converter smelting process for deep demanganization with low cost and high efficiency.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a low manganese steel converter converting method.
Background
Manganese is one of the most common elements in steel materials, and in general steel, manganese is a beneficial element, so that the strength of the steel can be improved, the brittleness can be reduced, and the harm of sulfur can be reduced. However, for some special steel grades, the increase of the manganese content reduces the toughness and the resistivity of the steel, reduces the conductivity and the temperature coefficient of resistance of the steel, increases the coercive force of the steel, and reduces the saturation magnetic induction, the residual magnetic induction and the magnetic permeability, so that for the special steel grades, the manganese content needs to be reduced to below 0.1 percent.
When the steel adopts the production process of molten iron pretreatment, converter smelting, secondary refining and continuous casting, manganese element is mainly removed in the converter smelting process; with the increase of the manganese content of molten iron and the requirement of low manganese steel for reducing the manganese content of molten steel at the end point of a converter, the requirement on deep demanganization of the converter is higher and higher, so that the research on the deep demanganization technology of the converter has a certain significance.
Chinese patent application publication No. CN108754060a discloses "a method for producing low manganese steel" (hereinafter, abbreviated as document 1). Comprising the following steps: controlling the manganese content of molten iron of a ladle pouring station to be not more than 0.18 percent and the silicon content to be not less than 0.3 percent, controlling the temperature of molten iron to be not less than 1300 ℃ and the scrap steel ratio to be not more than 6 percent, controlling double slag of a converter, the converter converting gun position adopts a low-high-low mode, the oxygen supply intensity is in a low-medium-low-high mode, and the bottom blowing intensity is in a strong-low-strong mode. The casting blank with the manganese content of the finished product not more than 0.035% can be stably produced by adopting the method.
Chinese patent application publication No. CN111440916a discloses "a method for producing ultra-low manganese steel using a high manganese molten iron converter" (hereinafter, referred to as document 2). Comprising the following steps: the smelting is carried out by selecting a furnace number with higher carbon-oxygen accumulation, adjusting the bottom blowing control mode according to the carbon-oxygen accumulation, adjusting the ratio of molten iron to scrap steel to create conditions for slag formation, using a reasonable oxygen gun control mode, using a sublance to measure the temperature of a molten pool at 1535-1570 ℃ and the carbon content at 0.3-0.5% in the middle and later stages of the blowing, and using a converter to blow at the end temperature of 1590-1630 ℃ and the end oxygen at 0.1-0.13%. The casting blank with the finished product manganese not more than 0.03% can be stably produced by adopting the method.
The Chinese patent application with publication number of CN106811567A discloses a method for producing low manganese steel (hereinafter referred to as document 3), wherein a process of combining converter duplex and LF stirring, heating and slag forming is adopted, so that the mass percentage of manganese content in steel tapping of the semisteel after the converter is controlled to be 0.03% -0.04%, and after LF treatment, the mass percentage of manganese content in molten steel is controlled to be below 0.02%, and the manganese content in finished products is controlled to be below 0.025%.
The Chinese patent application with publication number of CN108998614A discloses a smelting method of ultralow manganese steel (hereinafter referred to as document 4), which adopts a production process route of molten iron pretreatment-converter-LF furnace-RH, wherein a converter adopts a duplex process, full slag retention and double slag slagging technology, the oxygen value of the converter end point is controlled to be 0.06-0.08%, and the temperature of the converter end point is controlled to be 1660-1680 ℃. The mass percentage of manganese in the molten iron is required to be less than 0.16 percent. By adopting the process, the ultra-low manganese steel with the manganese content not more than 0.025 percent can be produced.
However, the above-mentioned document 1 does not limit the basicity of the semi-steel slag, the carbon and oxygen contents at the end point of the converter, and these factors have a determining influence on the demanganizing effect of the converter. In document 2, the oxygen content of molten steel tapped from the transfer furnace is 0.1% -0.13%, and such a high oxygen content affects the cleanliness of molten steel. Both the document 3 and the document 4 adopt a converter duplex method to match with secondary refining demanganization of molten steel, the process route is longer, and the production cost is higher.
Disclosure of Invention
The invention provides a converter blowing method of low manganese steel, which determines a converter blowing system according to the demanganization rate of a converter and the target mass percentage of manganese element in steel tapping of the converter, and is a converter smelting process with low cost and high efficiency and deep demanganization.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the blowing method of the low manganese steel converter specifically comprises the following steps:
1) Calculating the demanganization rate of the converter;
the calculation formula is as follows:
wherein: s- -demanganization rate of the converter;
Q iron (Fe) -weight of molten iron, t;
Q scrap steel -scrap weight, t;
Q furnace burden -the weight of other burden, t;
a- -the blowing rate of the converter,%;
X target object -the target mass percent of manganese element in converter tapping;
X iron (Fe) -manganese element mass percent in molten iron,%;
X scrap steel -manganese element mass percent in scrap steel,%;
X furnace burden -manganese element mass percent in other furnace charges;
2) According to the demanganization rate S of the converter and the target mass percentage content X of manganese element in tapping of the converter Target object And determining the converter blowing system.
Further, the manganese content of the low manganese steel is less than or equal to 0.1 percent.
Further, when S is less than or equal to 0.65 and X Target object When the carbon content of molten steel is more than or equal to 0.06, the converter blowing is operated by adopting a single slag method, and the carbon content of molten steel at the end point of the converter blowing is controlled to be less than or equal to 006%, the temperature of molten steel at the end of converter blowing is less than or equal to 1690 ℃.
Further, when S is less than or equal to 0.65 and X Target object When the carbon content of molten steel at the end point of converter blowing is less than or equal to 0.04%, the temperature of molten steel at the end point of converter blowing is less than or equal to 1670 ℃ by adopting a single slag method for converter blowing when the carbon content is less than 0.06.
Further, the single slag method operation means that slag skimming or deslagging is not carried out from the beginning of converter blowing to the beginning of tapping.
Further, when S is more than 0.65 and less than or equal to 0.85 and X Target object When the viscosity of the semisteel slag is more than 0.06, the converter blowing is operated by adopting a double slag method, the alkalinity of the semisteel slag is controlled to be 1-1.5, and the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s; the carbon content of the molten metal is controlled to be 2-3.5% during slag skimming, and the ratio of the amount of the skimmed slag to the total amount of the slag is more than or equal to 0.5; the carbon content of molten steel at the end of converter blowing is less than or equal to 0.05 percent, and the temperature at the end of converter blowing is less than or equal to 1690 ℃.
Further, when S is more than 0.65 and less than or equal to 0.85 and X Target object When the viscosity of the semisteel slag is less than 0.06, the converter blowing is operated by adopting a double slag method, the alkalinity of the semisteel slag is controlled to be 1-1.5, and the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s; the carbon content of the molten metal is controlled to be 2.5-3.5% during slag skimming, and the ratio of the amount of the skimmed slag to the total amount of the slag is more than or equal to 0.6; the carbon content of molten steel at the end of converter blowing is less than or equal to 0.03 percent, and the temperature at the end of converter blowing is less than or equal to 1650 ℃.
Further, the double slag method operation is an operation method that part of slag is poured out in the converter smelting process, and then flux is added for slag making.
Further, the mass percentage of manganese element of the flux added in the converter converting process is less than or equal to 1 percent.
Compared with the prior art, the invention has the beneficial effects that:
1) The manganese content of molten steel at the converting end point of the converter is mainly related to the carbon content of molten steel and the temperature of molten steel, the demanganization rate of the converter is closely related to the operation process of the converter, and the converter converting system is determined according to the demanganization rate of the converter and the manganese element target mass percent content of the tapping steel of the converter on the premise of comprehensively considering the factors, so that the cost of deep demanganization of the converter is low and the efficiency is high;
2) The influence of the manganese content in molten iron, scrap steel, other furnace burden and flux on the target manganese content of converter tapping is fully considered in the calculation of the converter demanganization rate, and the method is easy to implement, strong in operability and obvious in implementation effect.
Detailed Description
The invention relates to a blowing method of a low manganese steel converter, which comprises the following steps:
1) Calculating the demanganization rate of the converter;
the calculation formula is as follows:
wherein: s- -demanganization rate of the converter;
Q iron (Fe) -weight of molten iron, t;
Q scrap steel -scrap weight, t;
Q furnace burden -the weight of other burden, t;
a- -the blowing rate of the converter,%;
X target object -the target mass percent of manganese element in converter tapping;
X iron (Fe) -manganese element mass percent in molten iron,%;
X scrap steel -manganese element mass percent in scrap steel,%;
X furnace burden -manganese element mass percent in other furnace charges;
2) According to the demanganization rate S of the converter and the target mass percentage content X of manganese element in tapping of the converter Target object And determining the converter blowing system.
Further, the manganese content of the low manganese steel is less than or equal to 0.1 percent.
Further, when S is less than or equal to 0.65 and X Target object When the carbon content of molten steel at the end point of converter blowing is not more than 0.06%, the temperature of molten steel at the end point of converter blowing is not more than 1690 ℃ by adopting a single slag method to operate the converter blowing.
Further, when S is less than or equal to 0.65 and X Target object When the carbon content of molten steel at the end point of converter blowing is less than or equal to 0.06, the converter blowing is operated by adopting a single slag method, and the carbon content of the molten steel at the end point of converter blowing is controlled to be less than or equal to0.04 percent, and the temperature of molten steel at the end of converter blowing is less than or equal to 1670 ℃.
Further, the single slag method operation means that slag skimming or deslagging is not carried out from the beginning of converter blowing to the beginning of tapping.
Further, when S is more than 0.65 and less than or equal to 0.85 and X Target object When the viscosity of the semisteel slag is more than 0.06, the converter blowing is operated by adopting a double slag method, the alkalinity of the semisteel slag is controlled to be 1-1.5, and the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s; the carbon content of the molten metal is controlled to be 2-3.5% during slag skimming, and the ratio of the amount of the skimmed slag to the total amount of the slag is more than or equal to 0.5; the carbon content of molten steel at the end of converter blowing is less than or equal to 0.05 percent, and the temperature at the end of converter blowing is less than or equal to 1690 ℃.
Further, when S is more than 0.65 and less than or equal to 0.85 and X Target object When the viscosity of the semisteel slag is less than 0.06, the converter blowing is operated by adopting a double slag method, the alkalinity of the semisteel slag is controlled to be 1-1.5, and the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s; the carbon content of the molten metal is controlled to be 2.5-3.5% during slag skimming, and the ratio of the amount of the skimmed slag to the total amount of the slag is more than or equal to 0.6; the carbon content of molten steel at the end of converter blowing is less than or equal to 0.03 percent, and the temperature at the end of converter blowing is less than or equal to 1650 ℃.
Further, the double slag method operation is an operation method that part of slag is poured out in the converter smelting process, and then flux is added for slag making.
Further, the mass percentage of manganese element of the flux added in the converter converting process is less than or equal to 1 percent.
When S is more than 0.65 and less than or equal to 0.85 and more than 0.06 and when S is more than 0.65 and less than or equal to 0.85 and less than 0.06, the alkalinity of the semisteel slag is controlled to be 1-1.5, because the distribution ratio of manganese among slag and gold is the largest at this time, if the alkalinity is lower than 1, the furnace lining is severely eroded, and if the alkalinity is higher than 1.5, the distribution ratio of manganese among slag and gold is remarkably reduced. The alkalinity of the semisteel slag is controlled to be 1-1.5, so that manganese can enter the slag to the greatest extent.
When S is more than 0.65 and less than or equal to 0.85 and more than 0.06, and when S is more than 0.65 and less than or equal to 0.85 and less than 0.06, the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s, and the slag skimming effect is ideal, so that slag skimming is difficult due to excessive viscosity, and once the slag skimming amount is insufficient, manganese in the rear semisteel slag reenters into molten metal, so that the demanganization effect is reduced.
When S is more than 0.65 and less than or equal to 0.85 and more than 0.06, the carbon content of the molten metal is controlled to be 2% -3.5%, and when S is more than 0.65 and less than or equal to 0.85 and less than 0.06, the carbon content of the molten metal is controlled to be 2.5% -3.5%, because the manganese element is basically oxidized into the slag at the moment, and the oxidation of the carbon element is also in a suppressed stage, and the slag can realize that the manganese element is discharged out of the furnace to the maximum extent at the moment. When the carbon content is lower than the above range during slag skimming, the carbon reduces manganese element in slag, so that manganese reenters molten metal, and the demanganization effect is reduced.
Further, the manganese content of the low manganese steel is less than or equal to 0.1 percent.
Further, the single slag method operation means that slag skimming or deslagging is not carried out from the beginning of converter blowing to the beginning of tapping.
Further, the double slag method operation is an operation method that part of slag is poured out in the converter smelting process, and then flux is added for slag making.
Further, the mass percentage of manganese element of the flux added in the converter converting process is less than or equal to 1 percent.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples.
[ example 1 ]
In the embodiment, the blowing process of the low manganese steel converter is as follows:
(1) 254 tons of molten iron, 0.23 percent of molten iron manganese content, 27 tons of scrap steel, 0.13 percent of scrap steel manganese content, 5 percent of converter blowing loss, 0.1 percent of converter tapping target manganese content and 0.56 percent of converter demanganization rate through calculation.
(2) The converter blowing adopts a single slag method to operate, the converter flux comprises 8.5 tons of lime, 4.5 tons of dolomite and 2.5 tons of limestone, the lance position in the early stage of blowing is controlled to be 2.4-2.6 meters, the lance position in the middle stage of blowing is controlled to be about 3 meters, the lance position in the final stage of blowing is controlled to be 2.2-2.4 meters, the carbon content of molten steel at the end point of converter blowing is 0.045 percent, and the temperature of molten steel at the end point of converter blowing is 1678 ℃.
(3) And (3) taking a water sample of converter converting end point steel for detection, wherein the manganese content of the water sample is 0.087%.
[ example 2 ]
In the embodiment, the blowing process of the low manganese steel converter is as follows:
(1) 245 tons of molten iron, 0.1 percent of molten iron manganese, 33 tons of scrap steel, 0.12 percent of scrap steel manganese, 5 percent of converter blowing loss, 0.04 percent of target manganese in converter tapping, and 0.62 percent of converter demanganization rate through calculation.
(2) The converter blowing adopts a single slag method to operate, the converter flux comprises 8.5 tons of lime, 4.5 tons of dolomite and 2.5 tons of limestone, the lance position in the early stage of blowing is controlled to be 2.4-2.6 meters, the lance position in the middle stage of blowing is controlled to be about 3 meters, the lance position in the final stage of blowing is controlled to be 2.2-2.4 meters, the carbon content of molten steel at the end point of converter blowing is 0.03%, and the molten steel temperature at the end point of converter blowing is 1660 ℃.
(3) And (3) taking a water sample of converter converting end point steel for detection, wherein the manganese content of the water sample is 0.037%.
[ example 3 ]
In the embodiment, the blowing process of the low manganese steel converter is as follows:
(1) 255 tons of molten iron, 0.3 percent of molten iron manganese content, 32 tons of scrap steel, 0.13 percent of scrap steel manganese content, 5 percent of converter blowing loss, 0.09 percent of converter tapping target manganese content and 0.69 percent of converter demanganization rate through calculation.
(2) The converter blowing is operated by adopting a double slag method, the front semisteel converter flux comprises 3.5 tons of lime, 3 tons of dolomite and 2.5 tons of limestone, the gun position is controlled to be 2.5-2.8 m in 1-3 min after the blowing is started, the gun position is controlled to be 2.3-2.5 m in 3-4 min after the blowing is started, and the gun position is controlled to be 2.5-3.0 m after 4min after the blowing is started; the oxygen flow rate was 45000Nm 3 /h, oxygen accumulation of 5000Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The viscosity of the semisteel slag is controlled to be 0.32 Pa.s; and after the blowing of the semisteel is finished, slag discharge treatment is carried out, the slag discharge amount is 8 tons, a semisteel sample is taken to detect that the carbon content is 2.8%, and a semisteel slag sample is taken to detect that the alkalinity is 1.2.
(3) Adding 3 tons of dolomite and 1.2 tons of lime after the blowing of the rear semisteel is started, adding 1.2 tons of lime after slag formation, wherein the early stage oxygen position is 2.4-2.8 meters, and gradually transiting to the final stage gun position, wherein the oxygen flow is 45000Nm 3 And/h, the carbon content of molten steel at the end of converter blowing is 0.04, the temperature of molten steel at the end of converter blowing is 1675 ℃.
(4) And (3) taking a water sample of converter converting end point steel for detection, wherein the manganese content of the water sample is 0.074%.
[ example 4 ]
In the embodiment, the blowing process of the low manganese steel converter is as follows:
(1) The molten iron loading is 252 tons, the molten iron manganese content is 0.15 percent, the scrap steel loading is 30 tons, the scrap steel manganese content is 0.12 percent, the converter blowing loss is 5 percent, the converter tapping target manganese content is 0.04 percent, and the converter demanganization rate is 0.74 through calculation.
(2) The converter smelting adopts a double slag method operation, the front semisteel converter flux comprises 3.5 tons of lime, 3 tons of dolomite and 2.5 tons of limestone, the gun position is controlled to be 2.5-2.8 m in 1-3 min after the beginning of the blowing, the gun position is controlled to be 2.3-2.5 m in 3-4 min after the beginning of the blowing, and the gun position is controlled to be 2.5-3.0 m after 4min after the beginning of the blowing; the oxygen flow rate was 45000Nm 3 /h, oxygen accumulation of 5000Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The viscosity of the semisteel slag is controlled to be 0.28 Pa.s; and after the blowing of the semisteel is finished, slag discharge treatment is carried out, the slag discharge amount is 8.5 tons, a semisteel sample is taken to detect that the carbon content is 3.0%, and a semisteel slag sample is taken to detect that the alkalinity is 1.25.
(3) After the blowing of the second semisteel is started, adding 3 tons of dolomite and 1.2 tons of lime, adding 3.4 tons of lime after slag formation, controlling the early oxygen level to be 2.4-2.8 meters, and gradually transitioning to the final gun level; the oxygen flow rate was 45000Nm 3 And/h, the carbon content of the molten steel at the end of converter blowing is 0.025%, and the temperature of the molten steel at the end of converter blowing is 1645 ℃.
(4) And (3) taking a water sample of converter converting end point steel for detection, wherein the manganese content of the water sample is 0.035%.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The blowing method of the low manganese steel converter is characterized by comprising the following steps of:
1) Calculating the demanganization rate of the converter;
the calculation formula is as follows:
wherein: s- -demanganization rate of converter,%;
Q iron (Fe) -weight of molten iron, t;
Q scrap steel -scrap weight, t;
Q furnace burden -the weight of other burden, t;
a- -blowing loss rate of the converter;
X target object -the target mass percent of manganese element in converter tapping;
X iron (Fe) -manganese element mass percent in molten iron,%;
X scrap steel -manganese element mass percent in scrap steel,%;
X furnace burden -manganese element mass percent in other furnace charges;
2) According to the demanganization rate S of the converter and the target mass percentage content X of manganese element in tapping of the converter Target object Determining a converter converting system;
when S is less than or equal to 0.65 and X Target object When the carbon content of molten steel is more than or equal to 0.06%, the converter blowing is operated by adopting a single slag method, the carbon content of molten steel at the end of the converter blowing is controlled to be less than or equal to 0.06%, and the temperature of the molten steel at the end of the converter blowing is controlled to be less than or equal to 1690 ℃;
when S is less than or equal to 0.65 and X Target object When the carbon content of molten steel at the end point of converter blowing is less than or equal to 0.04%, the temperature of molten steel at the end point of converter blowing is less than or equal to 1670 ℃ by adopting a single slag method for converter blowing;
when S is more than 0.65 and less than or equal to 0.85 and X Target object When the content of the slag is more than 0.06%, the converter blowing is operated by adopting a double slag method, the alkalinity of the semisteel slag is controlled to be 1-1.5, and the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s; the carbon content of the molten metal is controlled to be 2-3.5% during slag skimming, and the ratio of the amount of the skimmed slag to the total amount of the slag is more than or equal to 0.5; the carbon content of molten steel at the end of converter blowing is less than or equal to 0.05 percent, and the temperature at the end of converter blowing is less than or equal to 1690 ℃;
when S is more than 0.65 and less than or equal to 0.85 and X Target object When the content of the slag is less than 0.06%, the converter blowing is operated by adopting a double slag method, the alkalinity of the semisteel slag is controlled to be 1-1.5, and the viscosity of the semisteel slag is controlled to be 0.2-0.4 Pa.s; the carbon content of the molten metal is controlled to be 2.5-3.5% during slag skimming, and the ratio of the amount of the skimmed slag to the total amount of the slag is more than or equal to 0.6; the carbon content of molten steel at the end of converter blowing is less than or equal to 0.03 percent, and the temperature at the end of converter blowing is less than or equal to 1650 ℃.
2. The converter blowing method of low manganese steel according to claim 1, wherein the manganese content of the low manganese steel is less than or equal to 0.1%.
3. The low manganese steel converter converting method according to claim 1, wherein the mass percentage of manganese element of the flux added in the converter converting process is less than or equal to 1%.
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