CN105219923A - A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel - Google Patents
A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel Download PDFInfo
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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
- 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
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The present invention relates to the technique that a kind of RKEF produces ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, comprise step: adopt the RKEF technique thick nickelalloy of melting and ferrochrome respectively, and control melting technology parameter; Produce thick nickelalloy molten iron and ferrochrome molten iron; Adopt ladle splendid attire above-mentioned alloy hot metal, and molten iron temperature is remained on AOD refining furnace and enter in the temperature range of thick nickelalloy molten iron and ferrochrome molten iron needed for stove; Above-mentioned alloy hot metal is proportionally mixed and is blended into after AOD refining furnace carries out refining, pour qualified AOD molten steel into ladle, be delivered to LF stove and carry out deep deoxidation; The molten steel handled well by LF stove is transported to continuous casting turn around table by traveling crane, casts slab or square billet by continuous caster.Adopt above-mentioned technique not only to reduce power consumption, production cost, product is become a useful person time shorten, and improve production capacity, site environment is clean environment firendly more, also reduces the labour intensity of employee, and produces the refining stainless steel product meeting national standard and user and require.
Description
Technical field
The invention belongs to metallurgical engineering technical field, be specifically related to a kind of new processing method of triplex process smelting stainless steel.
Background technology
At present, the stainless method of domestic and international production is adopt the thick nickelalloy block produced of ore-smelting furnace and ferrochrome block as main raw material substantially, because raw material is solid-state cold burden, electric arc furnace is needed again to melt, melt at electric arc furnace, by AOD refining furnace and other raw materials proportioning by a certain percentage, after the process such as decarburization, dephosphorization, carry out oxidation and final refining again, complete the adjustment of liquid alloy composition and temperature, finally become stainless steel, the qualified stainless steel after refining adopts continuous casting system to be made into stainless steel slab.Protected the processes such as chromium by a series of carbon drop, carry out the control of liquid steel temperature and alloying constituent, finally qualified molten steel is cast as stainless steel slab or square billet by continuous casting system.This production process power consumption is high, adds production cost.Production link is many, and product time of becoming a useful person is long, and production capacity is low, and increase investment goods (thick nickelalloy and ferrochrome casting system and thick nickelalloy and ferrochrome electric arc furnace melting unit) and store up place and vehicle conveyance system, environmental pollution is larger.Because production link is many, the series of problems such as the corresponding increasing of labour intensity of employee.
For improving stainless production capacity further, reduce production cost, creation and optimization is carried out in production technique, the middle thick link such as nickelalloy and ferrochrome casting, electric arc furnace remelting is produced to reduce, make full use of thick nickelalloy molten iron and ferrochrome molten iron heat energy, controlled by the slag type produced thick nickelalloy and ferrochrome, the temperature of slag temperature and molten iron controls, reaching the technology such as certain temperature when making it enter AOD furnace refining, to carry out that stainless test and industrialness produce be the direction needing to study of the present invention.
Summary of the invention
The present invention is in order to address the deficiencies of the prior art, realize above-mentioned purpose, to improve stainless production capacity, reduce production cost, the present invention is optimized in production technique, middle thick nickelalloy and ferrochrome casting is produced to reduce, the links such as electric arc furnace remelting, make full use of thick nickelalloy molten iron and ferrochrome molten iron heat energy, controlled by the slag type produced thick nickelalloy and ferrochrome, the temperature of slag temperature and molten iron controls, reach the technology such as certain temperature when making it enter AOD furnace refining and carry out stainless test and industrialness is produced, present invention employs the novel process of triplex process smelting stainless steel, adopt RKEF explained hereafter ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, and make stainless steel plate by continuous casting system.
The present invention adopts a kind of RKEF to produce the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, and described technique comprises the following steps:
1) adopt the RKEF technique thick nickelalloy of melting and ferrochrome respectively, and control melting technology parameter; Produce thick nickelalloy molten iron and ferrochrome molten iron;
2) the thick Rhometal molten iron produced and ferrochrome molten iron, adopt the thick nickelalloy molten iron of ladle splendid attire and ferrochrome molten iron, and molten iron temperature is remained on AOD refining furnace and enter in the temperature range of thick nickelalloy molten iron and ferrochrome molten iron needed for stove;
3) thick nickelalloy molten iron and ferrochrome molten iron are proportionally mixed be blended into AOD refining furnace and carry out decarburization, desulfurization;
4) pour qualified AOD molten steel into ladle, be delivered to LF stove and carry out deep deoxidation;
5) molten steel that LF stove is handled well is transported to continuous casting turn around table by traveling crane, casts slab or square billet by continuous caster; The stainless steel slab obtained or square embryo are put in storage.
Further, described step 1) in the control of processing parameter is comprised: to the control of producing the control of slag type of Rhometal molten iron and ferrochrome molten iron, slag temperature and iron temperature, to ensure that AOD refining furnace enters composition and the temperature of thick nickelalloy molten iron and ferrochrome molten iron needed for stove.
Preferably, described step 1) in the control of processing parameter is comprised: for thick nickelalloy melting, its Si/Mg controls between 1.75-1.85; Slag temperature control is within the scope of 1550-1570 DEG C, and iron temperature control is within the scope of 1500-1520 DEG C; For ferrochrome melting, its MgO/Al
2o
3control
1.0-1.7between; Slag temperature control exists
1650-1730within the scope of DEG C, iron temperature control exists
1550-1650 DEG Cin scope.
Further, described step 3) in thick Rhometal molten iron and ferrochrome molten iron mixing quality than being 2:1 ~ 2.6:1
Further, described step 2) in mixing molten iron temperature remained in temperature range that AOD refining furnace enters thick nickelalloy molten iron and ferrochrome molten iron needed for stove and can adopt at thick nickelalloy molten iron and Chrome metal powder molten iron level uniform fold lagging material, and/or control in the method for ladle equipment external parcel insulation of equipment material the temperature range mixing molten iron.Described lagging material can be adopted to adopt thermal insulation covering agent for steel ladle at the lagging material of thick nickelalloy molten iron and Chrome metal powder molten iron level uniform fold, wherein, thermal insulation covering agent for steel ladle chemical composition and mass percent be C15 ?20%, SiO
230% ~ 40%, CaO15% ~ 25%, Al
2o
39% ~ 15%, Fe
2o
32 ~ 5%, MgO2% ~ 5%.The described insulation of equipment material in ladle equipment external parcel adopts ceramic fiber blanket or the heat insulation soft felt of base of receiving.
Further, described step 3) in AOD refining furnace refinery practice comprise step:
(1) utilize oxygen rifle to carry out top and bottom complex blowing intensification, when temperature is risen to 1650-1700 DEG C, enter 1:1 carbon period.
(2) according to calculating carbon content real-time in molten steel, the maximum oxygen amount of corresponding infeed, adopts the mode of bottom blowing rare gas element to reduce CO dividing potential drop simultaneously and realizes temperature control and decarburization report chromium.AOD furnace top rifle blowing oxygen quantity is 3500 ~ 4000Nm3/h, and furnace bottom blown inert gas amount is 3500 ~ 4000Nm3/h; Terminal temperature controlled within the scope of 1660-1680 DEG C, end point carbon controls within the scope of 0.035%-0.045%.
(3) reductive agent ferrosilicon is added by feed bin, the oxide compound in reducing slag.
(4) add slag former, the add-on of slag former is in 5% ~ 8% scope of the total mass of mixing molten iron, is controlled below 0.005% by sulphur in steel, and controls the mobility of slag well.
Preferably, described slag former is lime, fluorite or magnesia.
Preferably, rare gas element is argon gas.
Further, described step 4) Zhong great Baogang water comprises by LF stove processing step:
(1) molten steel smelted through described AOD furnace is sent into LF stove, power transmission slag heats up, and adjustment liquid steel temperature, rises to temperature and meet continuous casting requirement temperature.
(2) adjust argon pressure 0.4-0.5Mpa, soft blow 10-15 minutes, and feed silico-calcium heart yearn; To stop the supple of gas or steam calm molten steel 8.5 ~ 9 minutes, ensure that inclusion fully floats, improve Molten Steel Cleanliness.
(3) during departures, the insulation dissolving agent dropping into 0.05 ~ 0.06% by steel quality covers the top of the slag completely, to extend the time of liquid slag, inclusion in further reinforcement slag absorption molten steel, Molten Steel Cleanliness is improved further, reduce large bag dry slag simultaneously, reduce the pollution to follow-up molten steel, molten steel sulphur content≤0.005% after the refining of LF stove.
Preferably, described silico-calcium heart yearn of feeding adopts the silico-calcium heart yearn containing 28%Ca to carry out single line feeding, and during line feeding, top blast argon gas stirs, and between line feeding degree of depth 1500mm ~ 2000mm, wire-feeding velocity is 100 ~ 110m/min, and line feeding amount is 0.7 ~ 1.0kg/t; Between line feeding time 45 ~ 69s.
Beneficial effect of the present invention is:
1) the present invention adopts the combination that RKEF technique and AOD furnace are smelted, and by the controlling and adjustment to RKEF processing parameter, produce thick nickel, ferrochrome molten iron as main raw material, directly by certain thermal-insulation control method thick nickel, ferrochrome molten iron are mixed in proportion collocation and are blended into AOD refining furnace, send into LF stove after using the control etc. of oxygenant (oxygen), slag former, temperature to carry out refining and carry out desulfurization and adjust alloying constituent producing stainless technique.In prior art, be generally that the appropriate ferrochrome that adds is smelted in the process of AOD refining furnace refining, its processing condition difficulty controls, and metal loss is large, and AOD furnace refining efficiency is reduced; Technique of the present invention is thick nickelalloy in the middle of decreasing and producing, the link such as casting, intermediate frequency furnace remelting of ferrochrome, simultaneously by controlling slag type, slag temperature, iron temperature etc. makes thick nickelalloy molten iron and ferrochrome molten iron meet the condition that AOD refining furnace enters stove, directly sends into AOD furnace and carries out refining, not only reduce power consumption, reduce its equipment investment cost and production cost, product become a useful person time shorten, improve production capacity, site environment is clean environment firendly more, also reduces the labour intensity of employee.LF stove smelting technology is that we carry out a large amount of innovation researches and improve summing up the smelting technology obtained afterwards according to integrated artistic, and calm molten steel certain hour of stopping the supple of gas or steam after feeding silico-calcium heart yearn as wherein added, ensures that inclusion fully floats, improve Molten Steel Cleanliness; And further use insulation dissolving agent, to strengthen the inclusion in slag absorption molten steel further, Molten Steel Cleanliness is improved further, reduces large bag dry slag simultaneously, reduce the pollution to follow-up molten steel.And the abundant combination of AOD refining furnace and LF stove smelting technology, improve the purity of molten steel, and make it meet continuous casting requirement temperature, directly can send into continuous caster.
2) traditional smelting stainless steel technique compared with employing " RKEF and AOD furnace triplex process smelting stainless steel ", decrease thick nickelalloy and the ferrochrome reflow process at electric arc furnace, as: the input reducing arc furnace equipment and support equipment and manpower, reduces cost of investment; Decrease electric arc furnace and melt thick nickelalloy and ferrochrome process; Decrease the resistance to material of melting process and the consumption of auxiliary material input.
3) melting is respectively adopted to obtain thick nickelalloy molten iron and ferrochrome molten iron, be used in thick nickelalloy molten iron and ferrochrome molten iron level uniform fold lagging material, and/or the temperature range of mixing molten iron is controlled in the method for ladle equipment external parcel insulation of equipment material, and it is directly sent into AOD furnace, greatly reduce thick nickelalloy and ferrochrome in the loss of electric arc furnace molten metal, thus improve metal recovery rate.
Embodiment
As follows to the detailed description of the invention below in conjunction with specific embodiment:
The reductibility of oxide compound is under equality of temperature, linear position is in lower element, easily by the Reduction of Oxide on its top out, namely its oxide compound is more stable, that is in melting temperature range, the reduction sequence of thick nickelalloy oxide compound is nickel, iron, silicon, and the reduction sequence of ferrochrome oxide compound is iron, chromium.
1) reaction formula of thick nickelalloy production is as follows:
NiO+C＝Ni+CO
FeO+C＝Fe+CO
SiO
2+2C＝Si+2CO；
2) the reduction reaction formula of ferrochrome production is as follows:
3(FeO·Cr
2O
3)+3C＝3Fe+3Cr
2O
3+3CO
Cr
2O
3+13/3C＝2/3Cr
3C
2+3CO
2/3Cr
2O
3+18/7C＝4/21Cr
7C
3+2CO
2/3Cr
2O
3+2C＝4/3Cr+2CO
MgO·Cr
2O
3+3C＝2Cr+MgO+3CO
SiO
2+ 2C=Si (liquid)+2CO;
3) the principal reaction formula of stainless steel refining is as follows:
(1) decarburizing reaction mechanism
[C]+[O]=CO; 2 [C]+O
2 (gas)=2CO; Cr
3o
4 (Gu)+ 4 [C]=3 [Cr]+4CO;
Cr
2O
3+3[C]＝2[Cr]+3CO
(2) silicon oxidation reaction mechanism
[Si]+O
2 (gas)=(SiO
2)
(3) reduction reaction mechanism
Cr
3o
4 (Gu)+ 2 [Si]=3 [Cr]+2 (SiO
2)
(4) desulfurization reaction mechanism
[FeS]+(CaO)＝(CaS)+[FeO]
Now to produce stainless steel on 33000kVA electric furnace, 75tAOD refining furnace, LF refining furnace, the first-class slab caster of a machine, describe and implement method of the present invention:
1) enter thick nickelalloy and ferrochrome molten iron temperature needed for stove according to AOD refining furnace, adopt the RKEF technique thick nickelalloy of melting and ferrochrome respectively, and control melting technology parameter; Produce thick nickelalloy molten iron and ferrochrome molten iron:
Specifically to the control of producing the control of slag type of Rhometal molten iron and ferrochrome molten iron, slag temperature and iron temperature, to ensure that AOD refining furnace enters composition and the temperature of thick nickelalloy molten iron and ferrochrome molten iron needed for stove; Wherein for thick nickelalloy melting, its Si/Mg controls between 1.75-1.85; Slag temperature control is within the scope of 1550-1570 DEG C, and iron temperature control is within the scope of 1500-1520 DEG C; For ferrochrome melting, its MgO/Al
2o
3control
1.0-1.7between; Slag temperature control exists
1650-1730within the scope of DEG C, iron temperature control exists
1550-1650within the scope of DEG C, preferably, the temperature control of ferrochrome smelting slag is within the scope of 1650-1680, and iron temperature control is within the scope of 1550-1580.
2) the thick Rhometal molten iron produced and ferrochrome molten iron, adopt the thick nickelalloy molten iron of ladle splendid attire and ferrochrome molten iron, and molten iron temperature is remained on AOD refining furnace and enter in the temperature range of thick nickelalloy molten iron and ferrochrome molten iron needed for stove; Can adopt at thick nickelalloy molten iron and ferrochrome molten iron level uniform fold lagging material, and/or control the temperature range of mixing molten iron in the method for ladle equipment external parcel insulation of equipment material, control molten iron temperature well.
In the present embodiment, we can adopt separately the insulation realizing alloy hot metal in the mode of the lagging material of thick nickelalloy molten iron and ferrochrome molten iron level uniform fold, also can adopt and realize hot-metal insulating in the mode of ladle external parcel ceramic fiber blanket (1600 ceramic fiber blanket) or the heat insulation soft felt of base of receiving.From technique effect, its preferred heat preserving mode combines for adopting above-mentioned two kinds of lagging materials, namely at the lagging material of hybrid alloys molten iron level uniform fold, and the insulation of alloy hot metal is realized in the Double insulating mode of ladle external parcel ceramic fiber blanket (1600 ceramic fiber blanket) or the heat insulation soft felt of base of receiving.To ensure that the temperature of alloy hot metal meets the temperature range that AOD refining furnace enters thick nickelalloy molten iron and ferrochrome molten iron needed for stove completely; Materials'use is specifically described in detail as follows:
Thermal insulation covering agent for steel ladle can be adopted at the lagging material of thick nickelalloy molten iron and Chrome metal powder molten iron level uniform fold, wherein, thermal insulation covering agent for steel ladle chemical composition and mass percent are C15-20%, SiO230% ~ 40%, CaO15% ~ 25%, Al2O39% ~ 15%, Fe2O32 ~ 5%, MgO2% ~ 5%.Its preparation method is: select expanded graphite 15% ~ 25%, magnesia 2% ~ 5%, and lime 15% ~ 25%, SiO230% ~ 40%, Al2O39% ~ 15%, Fe2O32 ~ 5% is as raw material; By expanded graphite, lime, magnesia weigh batching by weight, fritting at 1350-1400 DEG C after mixing, cooling after fusing, adopt naturally cooling or air-cooled rear fragmentation, then fine powder is made, mix levigate to 100 orders after allocating SiO2, Al2O3, Fe2O3 powder by weight into, after slurrying, make the particle insulating covering agent of hollow shape with low pressure atomizing prilling tower dry forming.
As selected carbonization rice husk, its Task-size Controlling is within 0 ~ 5mm scope; Its humid control exists: H2O≤0.5%.But the spreadability of carbonization rice husk is poor, the object of uniform fold can not be reached by drawout rapidly after adding ladle, and its thermal insulation function is not ideal enough.
Ceramic fiber blanket (1600 ceramic fiber blanket) or the heat insulation soft felt of base of receiving can be adopted at the lagging material of ladle equipment external parcel equipment, all be purchased from market.
Wherein, ceramic fiber blanket adopts special alumina-silicate ceramic fibre long filament through special two-side needled technological forming.Under neutral, oxidizing atmosphere, still can keep good tensile strength, toughness and fibrous texture during life-time service, ceramic fiber blanket has low heat conductivity, low heat capacity, excellent chemical stability, excellent thermostability and shock resistance, excellent tensile strength, the present invention adopt 1600 ceramic fiber blanket heatproofs to be 1600 DEG C.Through we research and use be highly suitable for ladle external parcel, realize good hot-metal insulating effect.The heat insulation soft felt of base of receiving is the extremely strong soft industrial lagging material of a kind of heat-proof quality, low-expansion coefficient, low heat shrinkage.Stable chemical performance, can the most of acid or alkali environment of withstand long term exposure except hydrofluoric acid and various radiation, long service life, is highly suitable for the heat insulation and insulation of equipment of outer backing of metallurgical industrial furnace, electric furnace through our research.Covered outside ladle through our research, be applicable to the insulation of molten iron of the present invention.Through above-mentioned heat preserving method, make the temperature of molten iron can reach the requirement of AOD refining furnace charging temperature completely, very effective thick nickelalloy and the ferrochrome of decreasing in the loss of electric arc furnace molten metal, thus improves metal recovery rate; And greatly reduce capacity consumption.
3) thick Rhometal molten iron and ferrochrome molten iron are mixed according to the ratio that mass ratio is 2:1 ~ 2.6:1, be blended into AOD refining furnace and carry out decarburization, desulfurization.
Driving handling ladle can be adopted and mixed thick Rhometal molten iron and ferrochrome molten iron are sent into AOD refining furnace and carry out refining; Wherein alloy material and slag former add-on calculate:
(1) alloy hot metal collocation calculates:
Redly send the ferrochrome water yield: 22750kg
Redly send the ferronickel water yield: 75000-22750=52250kg
(2) oxidation period lime adding amount:
Lime adding amount=Si%*75000*2.14*R/CaO%
Wherein, in formula, [%Si] represents silicone content in molten steel;
R=(%CaO)/(%SiO2) represents basicity; (%CaO) effective---effective CaO content in lime.
This embodiment is arranged in pairs or groups with following proportioning:
Redly send ferronickel water: 52T
Redly send chromium hot melt: 23T
Slag former (lime): 5.5T
AOD refining furnace refinery practice comprises step:
(1) utilize oxygen rifle to carry out top and bottom complex blowing intensification, when temperature is risen to 1650-1700 DEG C, enter 1:1 carbon period.
(2) according to calculating carbon content real-time in molten steel, the maximum oxygen amount of corresponding infeed (feeds maximum oxygen amount identical with the ratio of carbon content, i.e. oxygen amount needed for decarburization), adopt the mode of bottom blowing rare gas element to reduce CO dividing potential drop simultaneously and realize temperature control and decarburization and cr yield.AOD furnace top rifle blowing oxygen quantity is 3500 ~ 4000Nm3/h, and furnace bottom blown inert gas amount is 3500 ~ 4000Nm3/h; Terminal temperature controlled within the scope of 1660-1680 DEG C, end point carbon controls within the scope of 0.035%-0.045%.
(3) reductive agent ferrosilicon is added by feed bin, the oxide compound in reducing slag; Ferrosilicon 75 alloy (ferro-silicon of silicon content 75%) wherein such as can be used to carry out deoxidation alloying, calculate by the rate of recovery 90%, every T molten steel adds ferrosilicon 75 alloy about 5kg.
(4) add slag former, the add-on of slag former is in 5% ~ 8% scope of the total mass of mixing molten iron, is controlled below 0.005% by sulphur in steel, and controls the mobility of slag well.
Slag former can select lime, fluorite, magnesia;
4) pour qualified AOD molten steel into ladle, be delivered to LF stove and carry out deep deoxidation, processing step comprises:
(1) molten steel smelted through described AOD furnace is sent into LF stove, power transmission slag heats up, and adjustment liquid steel temperature, rises to temperature and meet continuous casting requirement temperature.
(2) argon pressure 0.4-0.5Mpa is adjusted, soft blow 10-15 minutes, and (adopt the silico-calcium heart yearn containing 28%Ca to carry out single line feeding, during line feeding, top blast argon gas stirs to feed silico-calcium heart yearn, heart yearn feeds ladle according to vertical direction, line feeding position is selected in by argon rifle, departs from ladle medullary ray about 100 ~ 200mm, between line feeding degree of depth 1500mm ~ 2000mm, wire-feeding velocity is 100 ~ 110m/min, and line feeding amount is 0.7 ~ 1.0kg/t; Line feeding 80 meters, between line feeding time 45 ~ 47s); To stop the supple of gas or steam calm molten steel 8.5 ~ 9 minutes, ensure that inclusion fully floats, improve inner quality and the fluidity molten steel of steel, reduce the content of steel water oxygen and sulphur further, improve Molten Steel Cleanliness.
(3) during departures, drop into 40kg insulation dissolving agent and cover the top of the slag completely, to extend the time of liquid slag, inclusion in further reinforcement slag absorption molten steel, Molten Steel Cleanliness is improved further, reduce large bag dry slag simultaneously, reduce the pollution to follow-up molten steel, molten steel sulphur content≤0.005% after the refining of LF stove.
The composition of described insulation dissolving agent comprises: main component SiO
235% ~ 45%, Al
2o
310% ~ 20%, other compositions are CaO10% ~ 16%; MgO2% ~ 6%, graphite: 10% ~ 20%; All the other are ferric oxide, and general ferric oxide mass percentage is 5% ~ 8%.Can adopt and obtain with the following method: first by each raw material powder process, granularity is 80-100 order, the aqueous binder (such as Starch Adhesive) accounting for raw material total amount about 2% can be added, be uniformly mixed 10 ~ 15min, spray the water of 8% of total raw material quality again, continue to stir 7min-15min, then granulate, last low temperature (about 35 DEG C) is dried, this product obtained
.during departures, by this insulation dissolving agent uniform fold top of the slag.
5) molten steel that LF stove is handled well is transported to continuous casting turn around table by traveling crane, casts slab or square billet by continuous caster; The making of square billet or slab is pressed continuous caster regulations for technical operation and is performed, specific as follows:
(1) tundish temperature controls at 1480-1490 DEG C; Casting speed control is at 1.25-1.40m/min.
(2) stopper, two cold water spray hydrominings are with automatically controlling.
(3) whole process protection cast.
The stainless steel slab obtained or square embryo are put in storage.
The Chemical Composition of product and slag composition:
(1) product composition
(2) slag composition
The stainless steel obtained is tabular; 6000 ~ 12000mm (length) × 160mm ~ 220mm (height) × 470 ~ 1600 (wide) mm; Square billet size: cross section is the square billet of the square length of side 160 ~ 220mm, the Chang Du≤12000mm of square billet; And meet the stainless steel product of national standard and user's requirement.The product that novel process technology of the present invention is produced is applicable to oil, chemical industry, shipbuilding, automobile, building, food, electronics, medical facilities, communal facility etc.
The present invention adopts the power supply system of low voltage, big current to carry out melting production in smelting substantially, and secondary voltage is roughly at 300-350V, and even higher operation between secondary current 30000-35000A, basicity of slag controls within the scope of 0.6-0.7 in addition.
Adopt above-mentioned technique not only to reduce power consumption, production cost, product is become a useful person time shorten, and improve production capacity, site environment is clean environment firendly more, also reduces the labour intensity of employee, and produces the refining stainless steel product meeting national standard and user and require.Traditional smelting stainless steel technique compared with employing " RKEF and AOD furnace triplex process smelting stainless steel ", decrease thick nickelalloy and the ferrochrome reflow process at electric arc furnace, as: the input reducing arc furnace equipment and support equipment and manpower, reduces cost of investment; Decrease electric arc furnace and melt thick nickelalloy and ferrochrome process, directly reduce and produce power consumption 580 KWhs/ton of steel.Be equivalent to ton steel and save mark coal 232kg, ton steel reduces Carbon emission 566.66kg; Decrease the resistance to material of melting process and the consumption of auxiliary material input, reduce lime consumption 60kg/ ton steel.In sum, producing and manufacturing technique of the present invention, adopt the thick Rhometal of RKEF explained hereafter by the control to slag type, slag temperature, molten iron temperature, by certain preservation and controlling directly by thick nickel, ferrochrome molten iron is mixed in proportion collocation and is blended into AOD refining furnace, use oxygenant (oxygen), slag former, the control of temperature etc. are sent into LF stove and are carried out desulfurization and adjustment alloying constituent and produce three refinings of stainless technique etc. and produce stainless Technology and operate after carrying out refining, its Chemical Composition of the stainless steel product obtained meets requirement in national standard and user's needs completely.
Claims (10)
1. RKEF produces a technique for ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: described technique comprises the following steps:
1) adopt the RKEF technique thick nickelalloy of melting and ferrochrome respectively, and control melting technology parameter; Produce thick nickelalloy molten iron and ferrochrome molten iron;
2) the thick Rhometal molten iron produced and ferrochrome molten iron, adopt the thick nickelalloy molten iron of ladle splendid attire and ferrochrome molten iron, and molten iron temperature is remained on AOD refining furnace and enter in the temperature range of thick nickelalloy molten iron and ferrochrome molten iron needed for stove;
3) thick nickelalloy molten iron and ferrochrome molten iron are proportionally mixed be blended into AOD refining furnace and carry out decarburization, desulfurization;
4) pour qualified AOD molten steel into ladle, be delivered to LF stove and carry out deep deoxidation;
5) molten steel that LF stove is handled well is transported to continuous casting turn around table by traveling crane, casts slab or square billet by continuous caster; The stainless steel slab obtained or square embryo are put in storage.
2. RKEF according to claim 1 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: in described step 1), the control of processing parameter is comprised: to the control of producing the control of slag type of Rhometal molten iron and ferrochrome molten iron, slag temperature and iron temperature, to ensure that AOD refining furnace enters composition and the temperature of thick nickelalloy molten iron and ferrochrome molten iron needed for stove.
3. RKEF according to claim 2 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: in described step 1), the control of processing parameter is comprised: for thick nickelalloy melting, its Si/Mg controls between 1.75-1.85; Slag temperature control is within the scope of 1550-1570 DEG C, and iron temperature control is within the scope of 1500-1520 DEG C; For ferrochrome melting, its MgO/Al
2o
3control between 1.0-1.7; Slag temperature control is within the scope of 1650-1730 DEG C, and iron temperature control is within the scope of 1550-1650 DEG C.
4. RKEF according to claim 1 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: in described step 3), thick Rhometal molten iron and ferrochrome molten iron mixing quality are than being 2:1 ~ 2.6:1.
5. RKEF according to claim 1 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: described step 2) in thick nickelalloy molten iron and ferrochrome molten iron temperature remained in temperature range that AOD refining furnace enters thick nickelalloy molten iron and ferrochrome molten iron needed for stove and can adopt at thick nickelalloy molten iron and Chrome metal powder molten iron level uniform fold lagging material, and/or control the temperature range of mixing molten iron in the method for ladle equipment external parcel insulation of equipment material.
6. RKEF according to claim 5 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: described lagging material can adopt thermal insulation covering agent for steel ladle, wherein, thermal insulation covering agent for steel ladle chemical composition and mass percent are C15-20%, SiO
230% ~ 40%, CaO15% ~ 25%, Al
2o
39% ~ 15%, Fe
2o
32 ~ 5%, MgO2% ~ 5%.
7. RKEF according to claim 5 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: the described insulation of equipment material in ladle equipment external parcel adopts ceramic fiber blanket or the heat insulation soft felt of base of receiving.
8. RKEF according to claim 1 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: in described step 3), AOD refining furnace refinery practice comprises step:
(1) utilize oxygen rifle to carry out top and bottom complex blowing intensification, when temperature is risen to 1650-1700 DEG C, enter 1:1 carbon period;
(2) according to calculating carbon content real-time in molten steel, the maximum oxygen amount of corresponding infeed, adopts the mode of bottom blowing rare gas element to reduce CO dividing potential drop simultaneously and realizes temperature control and decarburization and cr yield; AOD furnace top rifle blowing oxygen quantity is 3500 ~ 4000Nm3/h, and furnace bottom blown inert gas amount is 3500 ~ 4000Nm3/h; Terminal temperature controlled within the scope of 1660-1680 DEG C, end point carbon controls within the scope of 0.035%-0.045%;
(3) reductive agent ferrosilicon is added by feed bin, the oxide compound in reducing slag;
(4) add slag former, the add-on of slag former is in 5% ~ 8% scope of the total mass of mixing molten iron, is controlled below 0.005% by sulphur in steel.
9. RKEF according to claim 7 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: described slag former is lime, fluorite or magnesia; Shown rare gas element is argon gas.
10. RKEF according to claim 1 produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel, it is characterized in that: described step 4) Zhong great Baogang water comprises by LF stove processing step:
(1) molten steel smelted through described AOD furnace is sent into LF stove, power transmission slag heats up, and adjustment liquid steel temperature, rises to temperature and meet continuous casting requirement temperature;
(2) adjust argon pressure 0.4-0.5Mpa, soft blow 10-15 minutes, and feed silico-calcium heart yearn; To stop the supple of gas or steam calm molten steel 8.5 ~ 9 minutes, ensure that inclusion fully floats;
(3), during departures, the insulation dissolving agent dropping into 0.05 ~ 0.06% by steel quality covers the top of the slag completely, to extend the time of liquid slag, and molten steel sulphur content≤0.005% after the refining of LF stove.
Priority Applications (2)
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|---|---|---|---|
| CN201510641268.8A CN105219923A (en) | 2015-09-30 | 2015-09-30 | A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel |
| PCT/CN2015/095073 WO2017054299A1 (en) | 2015-09-30 | 2015-11-19 | Triplex stainless steel manufacturing process via rkef-based ferronickel and ferrochrome production and aod furnace |
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| CN201510641268.8A CN105219923A (en) | 2015-09-30 | 2015-09-30 | A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel |
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| CN107227424A (en) * | 2017-05-31 | 2017-10-03 | 中冶东方工程技术有限公司 | The smelting process of its smelting stainless steel of the smelting equipment and application of stainless steel |
| CN112226569A (en) * | 2020-10-10 | 2021-01-15 | 鞍钢股份有限公司 | Alloying method for producing high alloy steel by converter |
| CN113249540A (en) * | 2021-05-14 | 2021-08-13 | 山西太钢不锈钢股份有限公司 | Production method for smelting nickel-based stainless steel by using AOD furnace and using nickel hydroxide as raw material |
| CN115287405A (en) * | 2022-07-20 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Production method for deferrization and nickel increase of iron-nickel alloy |
| CN115505747A (en) * | 2022-10-21 | 2022-12-23 | 安徽富凯特材有限公司 | Production method of nickel-based alloy electrode ingot containing aluminum element |
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