CN102443678B - Method for smelting stainless steel mother liquor with furnace wall carbon-oxygen spray gun in arc furnace - Google Patents
Method for smelting stainless steel mother liquor with furnace wall carbon-oxygen spray gun in arc furnace Download PDFInfo
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- CN102443678B CN102443678B CN2011104442680A CN201110444268A CN102443678B CN 102443678 B CN102443678 B CN 102443678B CN 2011104442680 A CN2011104442680 A CN 2011104442680A CN 201110444268 A CN201110444268 A CN 201110444268A CN 102443678 B CN102443678 B CN 102443678B
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- 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
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Abstract
The invention discloses a method for smelting stainless steel mother liquor with a furnace wall carbon-oxygen spray gun in an arc furnace. The method is characterized in that an eccentric bottom tapping arc furnace provided with the furnace wall carbon-oxygen spray gun is used; during smelting, the furnace wall carbon-oxygen spray gun is used to preheat and cut metallic charge and perform oxygen blowing and decarburization in the oxidation period; by using the furnace wall carbon-oxygen spray gun to provide chemical energy and preheat and cut scrap steel, the melting rate can be increased, the smelting time, and electrode consumption and smelting power consumption can be reduced; a burner adopts a coherent jet oxygen supply mode to blow oxygen and decarburize so that the utilization rate of oxygen is high and the oxidation quantity of chromium is low; and the smelting time and the metallic charge consumption are reduced. The method uses the furnace wall carbon-oxygen spray gun to smelt stainless steel, thus the consumption of oxygen lances can be reduced, the production cost can be significantly lowered and the labor intensity of workers can be significantly reduced.
Description
Technical field
The invention belongs to the manufacture method of ferrous alloy product made from steel, relate to arc furnace steelmaking process, particularly a kind of electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, mainly is applicable to smelt chromium, nickel and stainless steel mother liquor.
Background technology
In prior art, while adopting electric arc furnace and vacuum oxygen decarburization refining furnace (VOD) duplex explained hereafter stainless steel, for reducing production costs, this steel of the general employing of batching returns and adds high-carbon ferrochrome scale-up version steel scrap composition, and the batching carbon back originally reaches 2.50～3.00%.Take 30 tons of electric arc furnace, 25MVA transformer efficiency is example, and electric arc furnace melting period is adopted full electric power fusing substantially.Voltage is at 380～436V, and electric current, at 20000～35000A, is melted to 80% left and right, is aided with oxygen blast and fluxes, and temperature reaches 1580～1600 ℃, the total analysis of taking a sample.Then adopt two oxygen lances manually to insert the molten steel decarburization, oxygen pressure-controlled 0.8～1.0MPa, oxygen blast flow 500～800m
3/ h, the oxygen decarburization time, at 40-60min, after prereduction, offers the carbon general control of vacuum oxygen decarburization refining furnace mother liquor of stainless steel 0.40～0.70%.
Above-mentioned electric arc furnace smelting mother liquor of stainless steel [mother liquor of stainless steel namely first (slightly) steel-making water, mother liquor of stainless steel need be smelted into qualified molten steel again through vacuum oxygen decarburization refining furnace (VOD)] when the smelting initial stage need consider to reduce the chromium oxidation, how to reach rapid melting, reach as early as possible the temperature requirement of " decarburization and cr yield ".Traditional technique mainly adopts electric power fusing to be aided with artificial oxygen blast and fluxes and make molten steel reach the temperature requirement of " decarburization and cr yield ".Therefore melting electric consumption is higher, and under low temperature, the oxidation chromium oxidation of fluxing is serious.The electric arc furnace smelting stainless steel reaches under the temperature requirement of " decarburization and cr yield " at molten steel, during oxygen decarburization, usually adopt artificial oxygen lance to insert molten steel and carry out oxygen decarburization, because oxygen blast pressure, flow are limited, the oxygen blast process needs the frequent oxygen lance of changing, oxygen blow duration is long, oxygen utilization rate is low, and the chromium oxidation is serious.
Adopt prior art electric arc furnace smelting mother liquor of stainless steel to have following major defect: (1) electric arc furnace smelting time is long, generally needs more than 3 hours, causes electric arc furnace and vacuum oxygen decarburization refining furnace (VOD) tap to tap time and rhythm to be difficult to coupling; (2) electric arc furnace decarburization speed is low, and the chromium oxidation is serious, makes the chromium recovery rate low, and production cost is high; (3) adopt artificial oxygen lance to insert molten steel and advance oxygen decarburization, production scene workman's operating environment condition is poor.Therefore, for a long time, perplexing the performance of electric arc furnace and vacuum oxygen decarburization refining furnace (VOD) duplex explained hereafter stainless steel function always.
Summary of the invention
Purpose of the present invention is intended to overcome deficiency of the prior art, provides a kind of electric arc furnace to adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid.By adopt the furnace wall carbonyl spray gun carry out metal charge preheating, cutting and oxidation period oxygen decarburization technology, thereby reduce 30t eccentric bottom tapping type (EBT) the electric arc furnace smelting stainless steel time, reduce the oxidation of chromium, reach the purpose that reduces electrode, melting electric consumption and metal charge cost.
Content of the present invention is: electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, it is characterized in that comprising the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is mainly the stainless class steel scrap that accounts for metal add-on 20～40% by mass percent, account for ferrochrome or ferrochrome and the nickelalloy etc. of metal add-on 10～20%, the heavy-duty waste steel that accounts for metal add-on 40～60% forms, and adds lime by 20～35kg/t mother liquor; Furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that furnace wall carbonyl spray gun (the JetBOxTM supersonic speed oxygen lance spraying that is the PTI of U.S. Technology company is penetrated system) is installed;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, (bell of outwarding winding) adds a part of furnace charge (in smelting furnace, then close bell) immediately, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2～3min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 30～50m
3/ h, oxygen 70～110m
3/ h;
B, power after 5～7min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, (bell of outwarding winding) the remaining part furnace charge (in smelting furnace, then close bell) of packing into, then smelt by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 60～70m
3/ h, oxygen 120～150m
3/ h;
Middle pattern is: natural gas 80～110m
3/ h, oxygen 160～230m
3/ h;
Height mode is: natural gas 130～150m
3/ h, oxygen 270～320m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change the furnace wall carbonyl spray gun into super oxygen pattern and carry out (fast) decarburization, decarburization time 13～18min,, end point carbon is controlled at 0.40～0.70%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60m
3/ h, oxygen 1200～1300m
3/ h;
D, reduction: add the Fe-Si piece, add the Fe-Si powder, add lime, add refining slag by 8～10kg/t mother liquor by 8～10kg/t mother liquor by 4～6kg/t mother liquor by 4～6kg/t mother liquor, after adopting 380V voltage, electric current 20000～35000A energising 7～8min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.40-0.70%, " Si "<0.30%.
In content of the present invention: the furnace wall of electric arc furnace described in first step is preferably is equipped with 3 furnace wall carbonyl spray guns, and be arranged on respectively between the top water cooling furnace wall up and down section furnace shell of electric arc furnace body and in the three-phase electrode on electric arc furnace, between electrode (establishing the furnace wall carbonyl spray gun is 1# rifle, 2# rifle and 3# rifle in central position in twos, electrode on electric arc furnace is 1#, 2# and 3# electrode: the 1# rifle at central position, 2# rifle between the 1#2# electrode in central position, 3# rifle central position between the 3#1# electrode between the 2#3# electrode).
In content of the present invention: described in step c, the furnace wall carbonyl spray gun is changed into to super oxygen pattern and carry out (fast) decarburization and replace with: change 2 furnace wall carbonyl spray guns in 3 furnace wall carbonyl spray guns (being 2# rifle, 3# rifle) into super oxygen pattern and carry out (fast) decarburization.
In content of the present invention: described step c, steps d and step e can replace with:
C, furnace charge melt substantially, can be to selecting spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, molten steel temperature reach 1580～1600 ℃ of temperature, carry out sampling analysis C, Cr, Si; Select super oxygen pattern to carry out quick decarburization 2 furnace wall carbonyl spray guns (2#, 3# furnace wall carbonyl spray gun), according to molten sorting, analyse the C result, by decarburization 0.05～0.06%C/min, control decarburization time, end point carbon is controlled at 0.60-0.70%, when oxygen blast finishes, described 2 (being 2#, 3#) furnace wall carbonyl spray guns are switched to Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60m
3/ h, oxygen 1200～1300m
3/ h;
E, prereduction operation:
(1) the slag charge composition is mainly: Fe-Si piece 4～6kg/t mother liquor, Fe-Si powder 4～6kg/t mother liquor, lime 8～10kg/t mother liquor and refining slag 8～10kg/t mother liquor; Also visual slag situation is suitably adjusted and is added appropriate fluorite;
(2) add slag charge, use the energising of 380V voltage, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 4～6kg/t mother liquor, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping: tapping temperature 1640-1660 ℃; The quality percentage composition of terminal composition is controlled to be: " C " 0.40-0.70%, " Si "<0.30%.
Compared with prior art, the present invention has following characteristics and beneficial effect:
(1) adopt the present invention, provide chemical energy to carry out scrap steel preheating, cut and improved burn-off rate by the furnace wall carbonyl spray gun, reduce tap to tap time, consumption of electrode, melting electric consumption; The cluster fluidic oxygen supply pattern oxygen decarburization of burner, oxygen utilization rate is high, and the chromium amount of oxidation is few; Reduce tap to tap time and metal charge consumption; Adopt the furnace wall carbonyl spray gun to smelt chromium, the stainless mother liquor of nickel, saved oxygen lance consumption, significantly reduce labor strength;
(2) the furnace wall carbonyl spray gun (JetBOxTM supersonic speed oxygen lance spraying is penetrated system) of the present invention's employing is the patented technology of the PTI of U.S. Technology company, 1. this technology has uses multiple spot oxygen supply spray carbon in cluster fluidic, stove, and oxygen supply intensity is large, oxygen utilization rate is high, decarbonization rate is fast; 2. burner power can reach 5.0MW, can produce multiple flame structure, effectively increases the chemical energy input, reduces the characteristics such as melting electric consumption;
(3) adopt the present invention, saved the replacing oxygen lance time when decarbonization rate improves, the present invention smelts stainless steel average tap to tap time is the 118min/ stove, than existing tap to tap time of 166min/ stove, has reduced the 48min/ stove, and production efficiency obviously improves; Electric arc furnace and vacuum oxygen decarburization refining furnace (VOD) duplex technique is smelted when chromium is stainless organizes continuous casting to produce, can save the 48min/ stove, thereby bring into play better the function of continuous casting continuous casting steel machine;
(4) adopt furnace wall carbonyl spray gun oxygen supply pattern, make molten steel reach fast the temperature requirement of " decarburization and cr yield ", oxygen blow duration shortens simultaneously, and the oxygen decarburization utilization ratio improves, and smelts total oxygen consuming amount and reduces, and the ratio of dioxygen oxidation chromium reduces; Average " Cr " rate of recovery of the stainless mother liquor of chromium, nickel of smelting by this smelting process reaches 88%, has improved 5% than prior art " Cr " rate of recovery 83%, greatly reduces production cost;
(5) adopt the present invention to smelt chromium, the stainless mother liquor of nickel, because providing chemical energy, the furnace wall carbonyl spray gun carries out scrap steel preheating, and shorten tap to tap time, the heat energy that furnace shell water-cooling system and atmosphere are taken away, exchanged is fewer, make average melting electric consumption be reduced to 490kwh/t, compared with prior art reduced 60kwh/t; Adopt the furnace wall carbonyl spray gun not need oxygen lance, saved oxygen lance and consumed 5.5kg/t; Because decarburization capacity improves, oxygen utilization rate improves, and oxygen depletion is reduced to 45m
3/ t, reduced 15m
3/ t; Because shorten tap to tap time, therefore the electrifying electrodes time shorten, 4.8kg/t is reduced in Electrode for remelting consumption, has compared with prior art reduced 0.7kg/t;
(6) the present invention start the furnace wall carbonyl spray gun carry out scrap steel preheating, cutting and oxidation period oxygen decarburization technology, technique is simple, processing ease, commercial effect is obvious, practical.
Embodiment
Embodiment given below intends so that the invention will be further described; but can not be interpreted as it is limiting the scope of the invention; the person skilled in art to some nonessential improvement and adjustment that the present invention makes, still belongs to protection scope of the present invention according to the content of the invention described above.
Embodiment 1:
A kind of arc stove adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid (smelting the 12Cr13 mother liquor), comprises the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is mass percent by P<0.035%(, heavy-duty waste steel afterwards together), the stainless class of chromium is returned to steel, high carbon ferro-chrome forms, food ingredient meets C<2.0%, P<0.035%, Cr 13.0-13.5%, and join lime 20-35kg/t mother liquor with material, furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that furnace wall carbonyl spray gun (the JetBOxTM supersonic speed oxygen lance spraying that is the PTI of U.S. Technology company is penetrated system) is installed; The arc furnace wall has 3 furnace wall carbonyl spray guns, be arranged on respectively between the top water cooling furnace wall up and down section furnace shell of electric arc furnace body and in the three-phase electrode on electric arc furnace, between electrode (establishing the furnace wall carbonyl spray gun is 1# rifle, 2# rifle and 3# rifle in central position in twos, electrode on electric arc furnace is 1#, 2# and 3# electrode: the 1# rifle at central position, 2# rifle between the 1#2# electrode in central position, 3# rifle central position between the 3#1# electrode between the 2#3# electrode);
Second step, smelting:
A, startup furnace wall carbonyl spray gun, and be set to Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopts voltage 380V, electric current 26000A power supply, wears well and after 2 minutes, uses voltage 436V, electric current 20000～35000A power supply instead;
After b, conduction time reaching 5min, the furnace wall carbonyl spray gun is set to low mode, and after smelting 5-7min, the furnace wall carbonyl spray gun is set to middle pattern, and after smelting 5-7min, the furnace wall carbonyl spray gun is set to height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
C, furnace charge melt substantially, can be to selecting spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, temperature 1580-1600 ℃, carry out sampling analysis C, Cr, Si; Select super oxygen pattern to carry out quick decarburization the 2# of furnace wall carbonyl spray gun, 3#, according to molten sorting, analyse the C result, control decarburization time by decarburization 0.05-0.06%C/min, end point carbon is controlled at 0.40-0.50%, when oxygen blast finishes, 2#, 3# furnace wall carbonyl spray gun are switched to Holdover mode;
E, prereduction operation:
(1) slag charge forms: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (suitably adjusting depending on the slag situation);
(2) slag charge adds rear use 380V voltage energising, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 180-240kg, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping temperature 1640-1660 ℃;
G, 12Cr13 mother liquor molten steel composition are controlled and are required: " C " 0.40-0.50%, " P "<0.035%, " Cr " 11.00～11.50%, " Si "<0.30%.
Adopt this programme to produce 5550 tons, stainless 150 stove of smelting chromium, electric arc furnace average tap to tap time is the 120min/ stove, and average " Cr " rate of recovery is 87%.
Embodiment 2:
A kind of electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid (smelting the 20Cr13 mother liquor), comprises the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is by 20～25t heavy-duty waste steel, the stainless returns of 10～15t chromium, the high chromium of 7～9t form, with material, add lime 800～1300kg, food ingredient meets C<2.0% (mass percent, rear same), P<0.035%, Cr 13.50-14.0%, and join lime 20-35kg/t mother liquor with material, furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that the furnace wall carbonyl spray gun is installed, with embodiment 1;
Second step, melting:
A, startup furnace wall carbonyl spray gun, and be set to Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopts voltage 380V, electric current 26000A power supply, wears well and after 2 minutes, uses voltage 436V, electric current 20000～35000A power supply instead;
After b, conduction time reaching 5min, the furnace wall carbonyl spray gun is set to low mode, after smelting 5-7min, the furnace wall carbonyl spray gun is set to middle pattern, after smelting 5-7min, the furnace wall carbonyl spray gun is set to height mode, furnace charge fusing is approximately after 80%, the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
C, furnace charge melt substantially, can be to selecting spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, temperature 1580-1600 ℃, carry out sampling analysis C, Cr, Si; Select super oxygen pattern to carry out quick decarburization the 2# of furnace wall carbonyl spray gun, 3#, according to molten sorting, analyse the C result, control decarburization time by decarburization 0.05-0.06%C/min, end point carbon is controlled at 0.50-0.60%, when oxygen blast finishes, 2#, 3# furnace wall carbonyl spray gun are switched to Holdover mode;
E, prereduction operation:
(1) slag charge forms: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (suitably adjusting depending on the slag situation);
(2) slag charge adds rear use 380V voltage energising, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 180-240kg, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping temperature 1640-1660 ℃;
G, 20Cr13 mother liquor molten steel composition are controlled and are required: " C " 0.50-0.60%, " P "<0.035%, " Cr " 11.80～12.30%, " Si "<0.30%.
Adopt this programme to produce 13000 tons, stainless 350 stove of smelting chromium, electric arc furnace average tap to tap time is the 118min/ stove, and average " Cr " rate of recovery is 88%.
Embodiment 3:
A kind of electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid (smelting the 30Cr13 mother liquor), comprises the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is by 20～25t heavy-duty waste steel, the stainless returns of 10～15t chromium, the high chromium of 7～9t form, with material, add lime 800～1300kg, food ingredient meets C<2.0%(mass percent, rear same), P<0.035%, Cr 13.50-14.0%, and join lime 20-35kg/t mother liquor with material, furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that the furnace wall carbonyl spray gun is installed, with embodiment 1;
Second step, melting:
A, startup furnace wall carbonyl spray gun, and be set to Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopts voltage 380V, electric current 26000A power supply, wears well and after 2 minutes, uses voltage 436V, electric current 20000～35000A power supply instead;
After b, conduction time reaching 5min, the furnace wall carbonyl spray gun is set to low mode, after smelting 5-7min, the furnace wall carbonyl spray gun is set to middle pattern, after smelting 5-7min, the furnace wall carbonyl spray gun is set to height mode, furnace charge fusing is approximately after 80%, the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
C, furnace charge melt substantially, can be to selecting spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, temperature 1580-1600 ℃, carry out sampling analysis C, Cr, Si; Select super oxygen pattern to carry out quick decarburization the 2# of furnace wall carbonyl spray gun, 3#, according to molten sorting, analyse the C result, control decarburization time by decarburization 0.05-0.06%C/min, end point carbon is controlled at 0.60-0.70%, when oxygen blast finishes, 2#, 3# furnace wall carbonyl spray gun are switched to Holdover mode;
E, prereduction operation:
(1) slag charge forms: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (suitably adjusting depending on the slag situation);
(2) slag charge adds rear use 380V voltage energising, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 180-240kg, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping temperature 1640-1660 ℃;
G, 30Cr13 mother liquor molten steel composition are controlled and are required: " C " 0.60-0.70%, " P "<0.035%, " Cr " 11.80～12.30%, " Si "<0.30%.
Adopt this programme to produce 5550 tons, stainless 150 stove of smelting chromium, electric arc furnace average tap to tap time is the 117min/ stove, and average " Cr " rate of recovery is 89%.
Embodiment 4:
A kind of electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid (smelting the TP347H mother liquor), comprises the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is by 20～40%(mass percent, stainless class steel scrap afterwards together), 15～20% ferrochrome, nickel plate form, 40～50% heavy-duty waste steel forms, food ingredient meets C<1.20%, P<0.025%, Cr 20.00-20.50%, and join lime 20-35kg/t mother liquor with material, furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that the furnace wall carbonyl spray gun is installed, with embodiment 1;
Second step, melting:
A, startup furnace wall carbonyl spray gun, and be set to Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopts voltage 380V, electric current 26000A power supply, wears well and after 2 minutes, uses voltage 436V, electric current 20000～35000A power supply instead;
After b, conduction time reaching 5min, the furnace wall carbonyl spray gun is set to low mode, after smelting 5-7min, the furnace wall carbonyl spray gun is set to middle pattern, after smelting 5-7min, the furnace wall carbonyl spray gun is set to height mode, furnace charge fusing is approximately after 80%, the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
C, furnace charge melt substantially, can be to selecting spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, temperature 1600-1620 ℃, carry out sampling analysis, select super oxygen pattern to carry out quick decarburization the 2# of furnace wall carbonyl spray gun, 3#, according to molten sorting, analyse the C result, by decarburization 0.05-0.06%C/min, control decarburization time, end point carbon is controlled at 0.40-0.50%, when oxygen blast finishes, 2#, 3# furnace wall carbonyl spray gun is switched to Holdover mode;
E, prereduction operation:
(1) slag charge forms: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (suitably adjusting depending on the slag situation);
(2) slag charge adds rear use 380V voltage energising, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 180-240kg, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping temperature 1640-1660 ℃;
G, TP347H mother liquor molten steel composition are controlled and are required: " C " 0.40-0.50%, " P "<0.028%, " Cr " 17.50～18.00%, " Si "<0.30%, " Ni " 17.50～18.00%;
Adopt this programme to produce 370 tons, TP347H 10 stove, electric arc furnace average tap to tap time is the 120min/ stove, and average " Cr " rate of recovery is 89%.
Embodiment 5:
A kind of arc stove adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid (smelting the 1Cr17Ni2 mother liquor), comprises the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is by P<0.035%(mass percent, heavy-duty waste steel afterwards together), the stainless class of chromium is returned to steel, ferrochrome, nickel plate formation, food ingredient meets C<2.0%, P<0.035%, Cr 18.0-19.0%, Ni1.80-2.0.0% also joins lime 20-35kg/t mother liquor with material, and furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that furnace wall carbonyl spray gun (the JetBOxTM supersonic speed oxygen lance spraying that is the PTI of U.S. Technology company is penetrated system) is installed;
Second step, smelting:
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2～3min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 30～50m
3/ h, oxygen 70～110m
3/ h;
B, power after 5～7min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 60～70m
3/ h, oxygen 120～150m
3/ h;
Middle pattern is: natural gas 80～110m
3/ h, oxygen 160～230m
3/ h;
Height mode is: natural gas 130～150m
3/ h, oxygen 270～320m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change the furnace wall carbonyl spray gun into super oxygen pattern and carry out (fast) decarburization, decarburization time 13～18min,, end point carbon is controlled at 0.40～0.50%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60m
3/ h, oxygen 1200～1300m
3/ h;
D, reduction: add the Fe-Si piece, add the Fe-Si powder, add lime, add refining slag by 8～10kg/t mother liquor by 8～10kg/t mother liquor by 4～6kg/t mother liquor by 4～6kg/t mother liquor, after adopting 380V voltage, electric current 20000～35000A energising 7～8min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.40-0.50%, " Si "<0.30% " Cr " 16.30-16.70% " Ni " 1.60-1.80%.
Embodiment 6:
Electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, comprises the following steps:
First step, batching and smelting furnace are equipped with: with embodiment 5, omit;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 40m
3/ h, oxygen 90m
3/ h;
B, power after 6min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 6min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 6min, the furnace wall carbonyl spray gun is used instead as height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 65m
3/ h, oxygen 130m
3/ h;
Middle pattern is: natural gas 90m
3/ h, oxygen 180m
3/ h;
Height mode is: natural gas 140m
3/ h, oxygen 300m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change the furnace wall carbonyl spray gun into super oxygen pattern and carry out decarburization, decarburization time 15min,, end point carbon is controlled at 0.50～0.70%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 50m
3/ h, oxygen 1250m
3/ h;
D, reduction: by 4～6kg/t mother liquor add the Fe-Si piece, by 4～6kg/t mother liquor add the Fe-Si powder, by 8～10kg/t mother liquor add lime, adopt 380V voltage, after electric current 20000～35000A energising 8min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 7min, carry out nitrogen and deeply blow stirring 8min; Finally slag tap 80%;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.50-0.70%, " P "<0.035%, " Cr " 11.50～12.50%, " Si "<0.30%.
Embodiment 7:
Electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid (smelting the 1Cr18Ni9 mother liquor), comprises the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is by 20～40%(mass percent, stainless class steel scrap afterwards together), 15～20% ferrochrome, nickel plate form, 40～50% heavy-duty waste steel forms, food ingredient meets C<1.20%, P<0.030%, Cr 20.00-20.50%, and join lime 20-35kg/t mother liquor with material, furnace charge is divided into two portions, also a minute secondary adds smelting furnace; The furnace charge material basket of packing into, hang in smelting furnace by driving;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that furnace wall carbonyl spray gun (the JetBOxTM supersonic speed oxygen lance spraying that is the PTI of U.S. Technology company is penetrated system) is installed; The arc furnace wall has 3 furnace wall carbonyl spray guns, be arranged on respectively between the top water cooling furnace wall up and down section furnace shell of electric arc furnace body and in the three-phase electrode on electric arc furnace, between electrode (establishing the furnace wall carbonyl spray gun is 1# rifle, 2# rifle and 3# rifle in central position in twos, electrode on electric arc furnace is 1#, 2# and 3# electrode: the 1# rifle at central position, 2# rifle between the 1#2# electrode in central position, 3# rifle central position between the 3#1# electrode between the 2#3# electrode);
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, add immediately furnace charge, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min～3;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 30～50m
3/ h, oxygen 70～110m
3/ h;
B, power after 5～7min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as height mode;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 60～70m
3/ h, oxygen 120～150m
3/ h;
Middle pattern is: natural gas 80～110m
3/ h, oxygen 160～230m
3/ h;
Height mode is: natural gas 130～150m
3/ h, oxygen 270～320m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change furnace wall carbonyl spray gun (3 furnace wall carbonyl spray gun in 2# rifle, 3# rifle) into super oxygen pattern and carry out (fast) decarburization, decarburization time 13～18min, end point carbon is controlled at 0.40～0.50%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60m
3/ h, oxygen 1200～1300m
3/ h;
D, reduction: by 4～6kg/t mother liquor add the Fe-Si piece, by 4～6kg/t mother liquor add the Fe-Si powder, by 8～10kg/t mother liquor add lime, adopt 380V voltage, after electric current 20000～35000A energising 7～8min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.40-0.70%, " P "<0.030%, " Cr " 17.30～17.60%, " Si "<0.30% " Ni " 8.30～8.60%.
Embodiment 8:
Electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, comprises the following steps:
First step, batching and smelting furnace are equipped with: with embodiment 7, omit;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 40m
3/ h, oxygen 90m
3/ h;
B, power after 6min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 6min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 6min, the furnace wall carbonyl spray gun is used instead as height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 65m
3/ h, oxygen 135m
3/ h;
Middle pattern is: natural gas 95m
3/ h, oxygen 195m
3/ h;
Height mode is: natural gas 140m
3/ h, oxygen 295m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change furnace wall carbonyl spray gun (3 furnace wall carbonyl spray gun in 2# rifle, 3# rifle) into super oxygen pattern and carry out (fast) decarburization, decarburization time 15min, end point carbon is controlled at 0.50～0.70%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 50m
3/ h, oxygen 1250m
3/ h;
D, reduction: by 4～6kg/t mother liquor add the Fe-Si piece, by 4～6kg/t mother liquor add the Fe-Si powder, by 8～10kg/t mother liquor add lime, adopt 380V voltage, after electric current 20000～35000A energising 7min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 6min, carry out nitrogen and deeply blow stirring 7min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.50-0.70%, " P "<0.035%, " Cr " 11.50～12.50%, " Si "<0.30%.
Embodiment 9:
Electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, comprises the following steps:
First step, batching and smelting furnace are equipped with: with embodiment 7, omit;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 30m
3/ h, oxygen 70m
3/ h;
B, power after 7min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 7min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 7min, the furnace wall carbonyl spray gun is used instead as height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 60m
3/ h, oxygen 120m
3/ h;
Middle pattern is: natural gas 80m
3/ h, oxygen 160m
3/ h;
Height mode is: natural gas 130m
3/ h, oxygen 270m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change furnace wall carbonyl spray gun (3 furnace wall carbonyl spray gun in 2# rifle, 3# rifle) into super oxygen pattern and carry out (fast) decarburization, decarburization time 18min, end point carbon is controlled at 0.50～0.70%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40m
3/ h, oxygen 1200m
3/ h;
D, reduction: by 4～6kg/t mother liquor add the Fe-Si piece, by 4～6kg/t mother liquor add the Fe-Si powder, by 8～10kg/t mother liquor add lime, adopt 380V voltage, after electric current 20000～35000A energising 8min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 7min, carry out nitrogen and deeply blow stirring 8min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.50-0.70%, " P "<0.035%, " Cr " 11.50～12.50%, " Si "<0.30%.
Embodiment 10:
Electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, comprises the following steps:
First step, batching and smelting furnace are equipped with: with embodiment 7, omit;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, the bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, then close bell, adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 3min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 50m
3/ h, oxygen 110m
3/ h;
B, power after 5min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 5min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 5min, the furnace wall carbonyl spray gun is used instead as height mode; Furnace charge fusing is approximately after 80%, and the furnace wall carbonyl spray gun is set to described Holdover mode, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, then close bell, then smelts by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 70m
3/ h, oxygen 150m
3/ h;
Middle pattern is: natural gas 110m
3/ h, oxygen 230m
3/ h;
Height mode is: natural gas 150m
3/ h, oxygen 320m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change furnace wall carbonyl spray gun (3 furnace wall carbonyl spray gun in 2# rifle, 3# rifle) into super oxygen pattern and carry out (fast) decarburization, decarburization time 13min, end point carbon is controlled at 0.50～0.70%,, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 60m
3/ h, oxygen 1300m
3/ h;
D, reduction: by 4～6kg/t mother liquor add the Fe-Si piece, by 4～6kg/t mother liquor add the Fe-Si powder, by 8～10kg/t mother liquor add lime, adopt 380V voltage, after electric current 20000～35000A energising 7min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 5min, carry out nitrogen and deeply blow stirring 5min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: " C " 0.50-0.70%, " P "<0.035%, " Cr " 11.50～12.50%, " Si "<0.30%.
Embodiment 11:
Electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, comprises the following steps:
Step c, steps d and step e replace with:
C, furnace charge melt substantially, can be to selecting spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, molten steel temperature reach 1580～1600 ℃ of temperature, carry out sampling analysis C, Cr, Si; Select super oxygen pattern to carry out quick decarburization 2 furnace wall carbonyl spray guns (2#, 3# furnace wall carbonyl spray gun), according to molten sorting, analyse the C result, by decarburization 0.05～0.06%C/min, control decarburization time, end point carbon is controlled at 0.60-0.70%, when oxygen blast finishes, described 2 (being 2#, 3#) furnace wall carbonyl spray guns are switched to Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60m
3/ h, oxygen 1200～1300m
3/ h;
E, prereduction operation:
(1) the slag charge composition is mainly: Fe-Si piece 4～6kg/t mother liquor, Fe-Si powder 4～6kg/t mother liquor, lime 8～10kg/t mother liquor and refining slag 8～10kg/t mother liquor; Also visual slag situation is suitably adjusted and is added appropriate fluorite;
(2) add slag charge, use the energising of 380V voltage, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 4～6kg/t mother liquor, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping: tapping temperature 1640-1660 ℃; The quality percentage composition of terminal composition is controlled to be: " C " 0.40-0.70%, " Si "<0.30%.
Arbitrary in the other the same as in Example 5-10, omit;
In above-described embodiment 1-4: when described furnace wall carbonyl spray gun was maintenance, basic, normal, high, super oxygen pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Holdover mode is: natural gas 30～50m
3/ h, oxygen 70～110m
3/ h;
Low mode is: natural gas 60～70m
3/ h, oxygen 120～150m
3/ h;
Middle pattern is: natural gas 80～110m
3/ h, oxygen 160～230m
3/ h;
Height mode is: natural gas 130～150m
3/ h, oxygen 270～320m
3/ h;
Super oxygen pattern is: 40～60m
3/ h, oxygen 1200～1300m
3/ h.
In above-described embodiment: in the percentage adopted, do not indicate especially, be the mass percent example; Described mass parts is kilogram or ton all.
In above-described embodiment: the processing parameter in each step (temperature, time, concentration etc.) and each amounts of components numerical value etc. are scope, and any point is all applicable.
In content of the present invention and above-described embodiment, the not concrete technology contents of narrating is with existing technology.
The invention is not restricted to above-described embodiment, content of the present invention is described all can implement and have described good result.
Claims (4)
1. electric arc furnace adopts the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, it is characterized in that comprising the following steps:
First step, batching and smelting furnace are equipped with:
Batching: furnace charge is mainly the stainless class steel scrap that accounts for metal add-on 20～40% by mass percent, account for ferrochrome or ferrochrome and the nickelalloy of metal add-on 10～20%, and the heavy-duty waste steel composition that accounts for metal add-on 40～60%, and add lime by 20～35kg/t mother liquor; Furnace charge is divided into two portions, also a minute secondary adds smelting furnace;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that the furnace wall carbonyl spray gun is installed;
Described furnace wall carbonyl spray gun is the JetBox of the PTI of U.S. Technology company
TMThe supersonic speed oxygen lance spraying is penetrated system;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be Holdover mode, adds immediately a part of furnace charge, adopts voltage 380V, electric current 20000～30000A power supply, uses voltage 436V, electric current 20000～35000A power supply instead after wearing well 2～3min;
Described furnace wall carbonyl spray gun is that Holdover mode is: the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen is respectively natural gas 30～50 m
3/ h, oxygen 70～110 m
3/ h;
B, power after 5～7min again, the furnace wall carbonyl spray gun is used instead as low mode, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as middle pattern, then after smelting 5～7min, the furnace wall carbonyl spray gun is used instead as height mode; After furnace charge fusing 80%, the furnace wall carbonyl spray gun is set to described Holdover mode, the remaining part furnace charge of packing into, then smelt by described step a and step b;
When described furnace wall carbonyl spray gun was basic, normal, high pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
Low mode is: natural gas 60～70 m
3/ h, oxygen 120～150 m
3/ h;
Middle pattern is: natural gas 80～110 m
3/ h, oxygen 160～230 m
3/ h;
Height mode is: natural gas 130～150 m
3/ h, oxygen 270～320 m
3/ h;
After c, molten steel temperature reach 1580～1600 ℃, have a power failure, change the furnace wall carbonyl spray gun into super oxygen pattern and carry out decarburization, decarburization time 13～18min, end point carbon is controlled at 0.40～0.70%, and then the furnace wall carbonyl spray gun is switched to described Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60 m
3/ h, oxygen 1200～1300 m
3/ h;
D, reduction: add the Fe-Si piece, add the Fe-Si powder, add lime, add refining slag by 8～10kg/t mother liquor by 8～10kg/t mother liquor by 4～6kg/t mother liquor by 4～6kg/t mother liquor, with after 380V voltage, electric current 20000～35000A energising 7～8min, after using again 190～360 V voltages, electric current 20000～35000A energising instead and spraying into continuously carbon dust 4～6kg/t mother liquor, energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal composition is controlled to be: C 0.40-0.70%, Si<0.30%.
2. by the described electric arc furnace of claim 1, adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, it is characterized in that: the wall of arc furnace described in first step has 3 furnace wall carbonyl spray guns, and is arranged on respectively between the top water cooling furnace wall up and down section furnace shell of electric arc furnace body and central position between electrode in twos in the three-phase electrode on electric arc furnace.
3. by the described electric arc furnace of claim 2, adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, it is characterized in that: described in step c, the furnace wall carbonyl spray gun is changed into to super oxygen pattern and carry out decarburization and replace with: change 2 furnace wall carbonyl spray guns in 3 furnace wall carbonyl spray guns into super oxygen pattern and carry out decarburization.
4. by the described electric arc furnace of claim 2, adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid, it is characterized in that: described step c, steps d and step e replace with:
The fusing of c, furnace charge, select spray carbon pattern spray carbon dust in stove, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, molten steel temperature reach 1580～1600 ℃ of temperature, carry out sampling analysis C, Cr, Si; Select super oxygen pattern to carry out quick decarburization 2 furnace wall carbonyl spray guns, according to molten sorting, analyse the C result, control decarburization time by decarburization 0.05～0.06%C/min, end point carbon is controlled at 0.60-0.70%, when oxygen blast finishes, described 2 furnace wall carbonyl spray guns are switched to Holdover mode;
Described furnace wall carbonyl spray gun for super oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively super oxygen pattern and is: 40～60 m
3/ h, oxygen 1200～1300 m
3/ h;
E, prereduction operation:
(1) the slag charge composition is mainly: Fe-Si piece 4～6kg/t mother liquor, Fe-Si powder 4～6kg/t mother liquor, lime 8～10kg/t mother liquor and refining slag 8～10kg/t mother liquor;
(2) add slag charge, use the energising of 380V voltage, electric current 20000～35000A, after energising 7～8min, use again 190～360 V voltages, electric current 20000～35000A energising instead and spray into continuously carbon dust 4～6kg/t mother liquor, after energising reduction 5～7min, carry out nitrogen and deeply blow stirring 5～8min, 70-80% finally slags tap;
F, tapping: tapping temperature 1640-1660 ℃; The quality percentage composition of terminal composition is controlled to be: C 0.40-0.70%, Si<0.30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104442680A CN102443678B (en) | 2011-12-27 | 2011-12-27 | Method for smelting stainless steel mother liquor with furnace wall carbon-oxygen spray gun in arc furnace |
Applications Claiming Priority (1)
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| CN105177219B (en) * | 2015-08-19 | 2017-05-24 | 山东西王特钢有限公司 | Low-phosphorous 4Cr5MoSiV1 steel manufactured through electric converter and manufacturing method |
| CN106498122B (en) * | 2016-10-21 | 2021-05-11 | 东北特钢集团大连高合金棒线材有限责任公司 | Method for smelting nickel stainless steel series by EBT electric arc furnace |
| CN106755725B (en) * | 2016-12-30 | 2019-03-15 | 张昌剑 | The method and melting furnace of chrome ore iron-bath molten reduction production chromium stainless steel mother liquor |
| CN107419055B (en) * | 2017-08-16 | 2019-11-12 | 攀钢集团研究院有限公司 | With the process and its mother liquor of stainless steel of smelting mother liquor of stainless steel from electric furnace |
| WO2019064433A1 (en) * | 2017-09-28 | 2019-04-04 | 大陽日酸株式会社 | Method for adjusting melting-refining furnace and melting-refining furnace |
| CN108411064B (en) * | 2018-04-11 | 2020-02-07 | 成都先进金属材料产业技术研究院有限公司 | Method for preheating electric furnace scrap steel |
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