CN102443678A - 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
- Publication number
- CN102443678A CN102443678A CN2011104442680A CN201110444268A CN102443678A CN 102443678 A CN102443678 A CN 102443678A CN 2011104442680 A CN2011104442680 A CN 2011104442680A CN 201110444268 A CN201110444268 A CN 201110444268A CN 102443678 A CN102443678 A CN 102443678A
- Authority
- CN
- China
- Prior art keywords
- furnace
- spray gun
- furnace wall
- oxygen
- carbonyl spray
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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 method for manufacture 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 the prior art, when 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%.With 30 tons of electric arc furnace, 25MVA transformer efficiency is example, and electric arc furnace melting period is adopted full electric power fusing basically.Voltage is at 380～436V, and electric current is melted to about 80% at 20000～35000A, is aided with oxygen blast and fluxes, and temperature reaches 1580～1600 ℃, the total analysis of taking a sample.Adopt artificial molten steel decarburization, oxygen pressure-controlled 0.8～1.0MPa, the oxygen blast flow 500～800m of inserting of two oxygen lances then
3/ h, the oxygen decarburization time, after prereduction, the carbon that offers the vacuum oxygen decarburization refining furnace mother liquor of stainless steel generally was controlled at 0.40～0.70% at 40-60min.
Above-mentioned electric arc furnace smelting mother liquor of stainless steel [mother liquor of stainless steel promptly first (slightly) steel-making water; Mother liquor of stainless steel needs to smelt into qualified molten steel once more through vacuum oxygen decarburization refining furnace (VOD)] when the smelting initial stage need consider to reduce the chromium oxidation, how to reach quick fusing, reach the temperature requirement of " decarburization and cr yield " as early as possible.Traditional technology 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 the oxidation chromium oxidation of fluxing is serious under the low temperature.The electric arc furnace smelting stainless steel reaches under the temperature requirement of " decarburization and cr yield " at molten steel; Usually adopt artificial oxygen lance to insert molten steel during oxygen decarburization and carry out oxygen decarburization; Because oxygen blast pressure, flow restricted, the oxygen blast process needs the frequent change oxygen lance, and 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) the electric arc furnace decarbonization rate is low, and the chromium oxidation is serious, makes the chromium yield 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
The object of the 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.Through 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 the stainless type of steel scrap that accounts for metal add-on 20～40% by mass percent mainly; Account for ferrochrome or the ferrochrome and the nickelalloy etc. of metal add-on 10～20%; The heavy-duty waste steel that accounts for metal add-on 40～60% is formed, and adds lime by 20～35kg/t mother liquor; The furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 the maintenance pattern; (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;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind 5～7min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and (bell of outwarding winding) the remaining part furnace charge (in smelting furnace, then close bell) of packing into is smelted by said step a and step b again;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 5～7min continuously; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point composition is controlled to be: " C " 0.40-0.70%, " Si "＜0.30%.
In the content of the present invention: the furnace wall of electric arc furnace described in the first step is preferably is equipped with 3 furnace wall carbonyl spray guns; And be installed between water cooled furnace wall, the top up and down portion furnace shell of electric arc furnace body of heater respectively and (establishing the furnace wall carbonyl spray gun is 1# rifle, 2# rifle and 3# rifle in the central position between the electrode in twos in the three-phase electrode on electric arc furnace; Electrode on the electric arc furnace is 1#, 2# and 3# electrode, then: 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 the content of the present invention: change the furnace wall carbonyl spray gun into ultra oxygen pattern described in the step c 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 ultra oxygen pattern and carry out (fast) decarburization.
In the content of the present invention: said step c, steps d and step e can replace with:
C, furnace charge melt basically, can in stove, select spray carbon pattern spray carbon dust, 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 ultra oxygen pattern to carry out quick decarburization 2 furnace wall carbonyl spray guns (2#, 3# furnace wall carbonyl spray gun); Analyse C result according to molten sorting; 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, said 2 (being 2#, 3#) furnace wall carbonyl spray guns is switched to the maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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 an amount of fluorite;
(2) add slag charge; Use the energising of 380V voltage, electric current 20000～35000A is behind energising 7～8min; Use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 4～6kg/t mother liquor continuously; Behind energising reduction 5～7min, carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping: tapping temperature 1640-1660 ℃; The quality percentage composition of terminal point 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) adopts the present invention, provide chemical energy to carry out the steel scrap preheating, cut and improved burn-off rate, reduce tap to tap time, consumption of electrode, melting electric consumption through the furnace wall carbonyl spray gun; 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, practiced thrift 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, the stove, and oxygen supply intensity is big, 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 characteristics such as melting electric consumption;
(3) adopt the present invention, practiced thrift 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 technology is smelted when chromium is stainless organizes continuous casting to produce, can practice thrift the 48min/ stove, thereby bring into play the function of continuous casting continuous casting steel machine better;
(4) adopt furnace wall carbonyl spray gun oxygen supply pattern, make molten steel reach the temperature requirement of " decarburization and cr yield " fast, 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 " recovery of the stainless mother liquor of chromium, nickel of smelting through this smelting process reaches 88%, has improved 5% than prior art " Cr " recovery 83%, greatly reduces production cost;
(5) adopt the present invention to smelt chromium, the stainless mother liquor of nickel; Because the furnace wall carbonyl spray gun provides chemical energy to carry out the steel scrap preheating; And shorten tap to tap time; The heat energy that furnace shell water-cooling system and atmosphere are taken away, exchanged is few more, makes average melting electric consumption be reduced to 490kwh/t, has compared with prior art reduced 60kwh/t; Adopt the furnace wall carbonyl spray gun not need oxygen lance, practiced thrift oxygen lance and consumed 5.5kg/t; Because of decarburization capacity improves, oxygen utilization rate improves, and oxygen depletion is reduced to 45m
3/ t has reduced 15m
3/ t; Because of shorten tap to tap time, so the electrifying electrodes time shortens, 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 steel scrap preheating, cutting and oxidation period oxygen decarburization technology, technology is simple, processing ease, commercial effect is obvious, and is practical.
Embodiment
Embodiment given below intends so that the present invention is described further; But can not be interpreted as it is restriction to protection domain of the present invention; The technician in this field 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%; The back with) heavy-duty waste steel, the stainless class of chromium is returned steel, high carbon ferro-chrome constitutes, food ingredient satisfies C＜2.0%; P＜0.035%; Cr 13.0-13.5%, and join lime 20-35kg/t mother liquor with material, the furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 installed between water cooled furnace wall, the top up and down portion furnace shell of electric arc furnace body of heater respectively and (establishing the furnace wall carbonyl spray gun is 1# rifle, 2# rifle and 3# rifle in the central position between the electrode in twos in the three-phase electrode on electric arc furnace; Electrode on the electric arc furnace is 1#, 2# and 3# electrode, then: 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then, adopts voltage 380V, electric current 26000A power supply, wears well and uses voltage 436V, electric current 20000～35000A power supply after 2 minutes instead;
After b, conduction time reaching 5min, the furnace wall carbonyl spray gun is set to low mode, and the furnace wall carbonyl spray gun is set to middle pattern behind the smelting 5-7min, and the furnace wall carbonyl spray gun is set to height mode behind the smelting 5-7min; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
C, furnace charge melt basically, can in stove, select spray carbon pattern spray carbon dust, 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 ultra oxygen pattern to carry out quick decarburization 2#, the 3# of furnace wall carbonyl spray gun; Analyse C result according to molten sorting, 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 are switched to the maintenance pattern;
E, prereduction operation:
(1) slag charge is formed: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (looking the slag situation suitably adjusts);
(2) slag charge adds the energising of back use 380V voltage; Electric current 20000～35000A; Behind energising 7～8min, use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 180-240kg continuously, behind energising reduction 5～7min; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping temperature 1640-1660 ℃;
G, the control of 12Cr13 mother liquor molten steel composition require: " C " 0.40-0.50%, " P "＜0.035%, " Cr " 11.00～11.50%, " Si "＜0.30%.
Adopt this programme to produce 5550 tons in stainless 150 stoves of smelting chromium, electric arc furnace average tap to tap time is the 120min/ stove, and average " Cr " 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, and the stainless returns of 10～15t chromium, the high chromium of 7～9t constitute, and add lime 800～1300kg with material; Food ingredient satisfies C＜2.0% (mass percent; The back is together), P＜0.035%, Cr 13.50-14.0%; And join lime 20-35kg/t mother liquor with material, the furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then, adopts voltage 380V, electric current 26000A power supply, wears well and uses voltage 436V, electric current 20000～35000A power supply after 2 minutes instead;
After b, conduction time reaching 5min; The furnace wall carbonyl spray gun is set to low mode, and the furnace wall carbonyl spray gun is set to middle pattern behind the smelting 5-7min, and the furnace wall carbonyl spray gun is set to height mode behind the smelting 5-7min; After furnace charge melts about 80%; The furnace wall carbonyl spray gun is set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
C, furnace charge melt basically, can in stove, select spray carbon pattern spray carbon dust, 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 ultra oxygen pattern to carry out quick decarburization 2#, the 3# of furnace wall carbonyl spray gun; Analyse C result according to molten sorting, by decarburization 0.05-0.06%C/min control decarburization time, end point carbon is controlled at 0.50-0.60%; When oxygen blast finishes, 2#, 3# furnace wall carbonyl spray gun are switched to the maintenance pattern;
E, prereduction operation:
(1) slag charge is formed: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (looking the slag situation suitably adjusts);
(2) slag charge adds the energising of back use 380V voltage; Electric current 20000～35000A; Behind energising 7～8min, use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 180-240kg continuously, behind energising reduction 5～7min; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping temperature 1640-1660 ℃;
G, the control of 20Cr13 mother liquor molten steel composition require: " C " 0.50-0.60%, " P "＜0.035%, " Cr " 11.80～12.30%, " Si "＜0.30%.
Adopt this programme to produce 13000 tons in stainless 350 stoves of smelting chromium, electric arc furnace average tap to tap time is the 118min/ stove, and average " Cr " 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, and the stainless returns of 10～15t chromium, the high chromium of 7～9t constitute, and add lime 800～1300kg with material; Food ingredient satisfies C＜2.0% (mass percent; The back is together), P＜0.035%, Cr 13.50-14.0%; And join lime 20-35kg/t mother liquor with material, the furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then, adopts voltage 380V, electric current 26000A power supply, wears well and uses voltage 436V, electric current 20000～35000A power supply after 2 minutes instead;
After b, conduction time reaching 5min; The furnace wall carbonyl spray gun is set to low mode, and the furnace wall carbonyl spray gun is set to middle pattern behind the smelting 5-7min, and the furnace wall carbonyl spray gun is set to height mode behind the smelting 5-7min; After furnace charge melts about 80%; The furnace wall carbonyl spray gun is set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
C, furnace charge melt basically, can in stove, select spray carbon pattern spray carbon dust, 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 ultra oxygen pattern to carry out quick decarburization 2#, the 3# of furnace wall carbonyl spray gun; Analyse C result according to molten sorting, 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, 2#, 3# furnace wall carbonyl spray gun are switched to the maintenance pattern;
E, prereduction operation:
(1) slag charge is formed: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (looking the slag situation suitably adjusts);
(2) slag charge adds the energising of back use 380V voltage; Electric current 20000～35000A; Behind energising 7～8min, use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 180-240kg continuously, behind energising reduction 5～7min; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping temperature 1640-1660 ℃;
G, the control of 30Cr13 mother liquor molten steel composition require: " C " 0.60-0.70%, " P "＜0.035%, " Cr " 11.80～12.30%, " Si "＜0.30%.
Adopt this programme to produce 5550 tons in stainless 150 stoves of smelting chromium, electric arc furnace average tap to tap time is the 117min/ stove, and average " Cr " 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 the stainless type of steel scrap of 20～40% (mass percent, back are together), and 15～20% ferro-chromium, nickel plate constitute; 40～50% heavy-duty waste steel is formed; Food ingredient satisfies C＜1.20%, P＜0.025%, Cr 20.00-20.50%; And join lime 20-35kg/t mother liquor with material, the furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then, adopts voltage 380V, electric current 26000A power supply, wears well and uses voltage 436V, electric current 20000～35000A power supply after 2 minutes instead;
After b, conduction time reaching 5min; The furnace wall carbonyl spray gun is set to low mode, and the furnace wall carbonyl spray gun is set to middle pattern behind the smelting 5-7min, and the furnace wall carbonyl spray gun is set to height mode behind the smelting 5-7min; After furnace charge melts about 80%; The furnace wall carbonyl spray gun is set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
C, furnace charge melt basically, can in stove, select spray carbon pattern spray carbon dust, making foamed slag, carry out arc-covering slag operation, and whole process is closed fire door;
D, temperature 1600-1620 ℃; Carry out sampling analysis, 2#, the ultra oxygen pattern of 3# selection of furnace wall carbonyl spray gun are carried out quick decarburization, analyse C result according to molten sorting; 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 the maintenance pattern;
E, prereduction operation:
(1) slag charge is formed: Fe-Si piece 200kg, Fe-Si powder 200kg, lime 350kg, refining slag 300kg, fluorite (looking the slag situation suitably adjusts);
(2) slag charge adds the energising of back use 380V voltage; Electric current 20000～35000A; Behind energising 7～8min, use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 180-240kg continuously, behind energising reduction 5～7min; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping temperature 1640-1660 ℃;
G, the control of TP347H mother liquor molten steel composition require: " 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 in TP347H 10 stoves, electric arc furnace average tap to tap time is the 120min/ stove, and average " Cr " 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; The back with) heavy-duty waste steel, the stainless class of chromium is returned steel, ferro-chromium, nickel plate and is constituted, food ingredient satisfies 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 the furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then; Adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2～3min;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind 5～7min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 5～7min continuously; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then; Adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind the 6min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind the 6min furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind the 6min furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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, behind electric current 20000～35000A energising 8min; After using 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 7min continuously, carry out nitrogen and blow stirring 8min deeply; Slag tap 80% at last;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point 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 the stainless type of steel scrap of 20～40% (mass percent, back are together), and 15～20% ferro-chromium, nickel plate constitute; 40～50% heavy-duty waste steel is formed; Food ingredient satisfies C＜1.20%, P＜0.030%, Cr 20.00-20.50%; And join lime 20-35kg/t mother liquor with material, the furnace charge separated into two parts also divides secondary to add smelting furnace; The furnace charge material basket of packing into hangs 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 installed between water cooled furnace wall, the top up and down portion furnace shell of electric arc furnace body of heater respectively and (establishing the furnace wall carbonyl spray gun is 1# rifle, 2# rifle and 3# rifle in the central position between the electrode in twos in the three-phase electrode on electric arc furnace; Electrode on the electric arc furnace is 1#, 2# and 3# electrode, then: 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then; Add furnace charge immediately; Adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min～3;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind 5～7min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be height mode;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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, behind electric current 20000～35000A energising 7～8min; After using 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 5～7min continuously; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then; Adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind the 6min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind the 6min furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind the 6min furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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, behind electric current 20000～35000A energising 7min; After using 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 6min continuously; Carry out nitrogen and blow stirring 7min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then; Adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 2min;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind the 7min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind the 7min furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind the 7min furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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, behind electric current 20000～35000A energising 8min; After using 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 7min continuously; Carry out nitrogen and blow stirring 8min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point 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 the maintenance pattern; The bell of outwarding winding immediately adds a part of furnace charge in smelting furnace, close bell then; Adopt voltage 380V, electric current 20000～30000A power supply, use voltage 436V, electric current 20000～35000A power supply instead after wearing well 3min;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind the 5min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind the 5min furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind the 5min furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the bell of outwarding winding is packed the remaining part furnace charge in smelting furnace, close bell then, smelts by said step a and step b again;
When said 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 ultra 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 switched to said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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, behind electric current 20000～35000A energising 7min; After using 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 5min continuously; Carry out nitrogen and blow stirring 5min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point 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 basically, can in stove, select spray carbon pattern spray carbon dust, 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 ultra oxygen pattern to carry out quick decarburization 2 furnace wall carbonyl spray guns (2#, 3# furnace wall carbonyl spray gun); Analyse C result according to molten sorting; 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, said 2 (being 2#, 3#) furnace wall carbonyl spray guns is switched to the maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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 an amount of fluorite;
(2) add slag charge; Use the energising of 380V voltage, electric current 20000～35000A is behind energising 7～8min; Use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 4～6kg/t mother liquor continuously; Behind energising reduction 5～7min, carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping: tapping temperature 1640-1660 ℃; The quality percentage composition of terminal point composition is controlled to be: " C " 0.40-0.70%, " Si "＜0.30%.
Other omits with arbitrary among the embodiment 5-10;
In the foregoing description 1-4: when said furnace wall carbonyl spray gun was maintenance, basic, normal, high, ultra oxygen pattern, the flow that the furnace wall carbonyl spray gun sprays natural gas and oxygen was respectively:
The maintenance pattern 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;
Ultra oxygen pattern is: 40～60m
3/ h, oxygen 1200～1300m
3/ h.
In the foregoing description: in the percentage that is adopted, do not indicate especially, be the mass percent example; Said mass parts is kilogram or ton all.
In the foregoing description: 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.
The not concrete same prior art of narrating of technology contents in content of the present invention and the foregoing description.
The invention is not restricted to the foregoing description, content of the present invention is said all can implement and have said 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 the stainless type of steel scrap that accounts for metal add-on 20～40% by mass percent mainly; Account for ferrochrome or the 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 by 20～35kg/t mother liquor adding lime; The furnace charge separated into two parts also divides secondary to add smelting furnace;
Smelting furnace adopts the 30t eccentric bottom tapping type electric arc furnace that the furnace wall carbonyl spray gun is installed;
Second step, smelting:
A, to start the furnace wall carbonyl spray gun and the furnace wall carbonyl spray gun is set be the maintenance pattern, adds a part of furnace charge immediately, adopts voltage 380V, electric current 20000～30000A power supply, uses voltage 436V, electric current 20000～35000A power supply instead after wearing well 2～3min;
Said furnace wall carbonyl spray gun for the maintenance pattern 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, supply power behind 5～7min again, the furnace wall carbonyl spray gun is used instead be low mode, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be middle pattern, smelt again behind 5～7min the furnace wall carbonyl spray gun used instead and be height mode; After furnace charge melted about 80%, the furnace wall carbonyl spray gun was set to said maintenance pattern, and the remaining part furnace charge of packing into is smelted by said step a and step b again;
When said 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 ultra 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 said maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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, adopt by 8～10kg/t mother liquor adding refining slag by 8～10kg/t mother liquor by 4～6kg/t mother liquor by 4～6kg/t mother liquor; Behind 380V voltage, electric current 20000～35000A energising 7～8min; After using 190～360 V voltages, electric current 20000～35000A energising again instead and spraying into carbon dust 4～6kg/t mother liquor, energising reduction 5～7min continuously; Carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
E, tapping: 1640～1660 ℃ of tapping temperatures; The quality percentage composition of terminal point composition is controlled to be: " C " 0.40-0.70%, " Si "＜0.30%.
2. adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid by the said electric arc furnace of claim 1; It is characterized in that: the wall of Arc Furnace described in the first step has 3 furnace wall carbonyl spray guns, and is installed between water cooled furnace wall, the top up and down portion furnace shell of electric arc furnace body of heater respectively and central position between the electrode in twos in the three-phase electrode on electric arc furnace.
3. adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid by the said electric arc furnace of claim 2, it is characterized in that: change the furnace wall carbonyl spray gun into ultra oxygen pattern described in the step c and carry out decarburization and replace with: change 2 furnace wall carbonyl spray guns in 3 furnace wall carbonyl spray guns into ultra oxygen pattern and carry out decarburization.
4. adopt the method for furnace wall carbonyl spray gun smelting stainless steel mother liquid by the said electric arc furnace of claim 2, it is characterized in that: said step c, steps d and step e replace with:
C, furnace charge melt basically, in stove, select spray carbon pattern spray carbon dust, 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 ultra oxygen pattern to carry out quick decarburization 2 furnace wall carbonyl spray guns; Analyse C result according to molten sorting, 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, said 2 furnace wall carbonyl spray guns are switched to the maintenance pattern;
Said furnace wall carbonyl spray gun for ultra oxygen pattern is: the flow of furnace wall carbonyl spray gun injection natural gas and oxygen is respectively ultra 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;
(2) add slag charge; Use the energising of 380V voltage, electric current 20000～35000A is behind energising 7～8min; Use 190～360 V voltages, electric current 20000～35000A energising again instead and spray into carbon dust 4～6kg/t mother liquor continuously; Behind energising reduction 5～7min, carry out nitrogen and blow stirring 5～8min deeply, 70-80% at last slags tap;
F, tapping: tapping temperature 1640-1660 ℃; The quality percentage composition of terminal point 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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102443678A true CN102443678A (en) | 2012-05-09 |
| CN102443678B CN102443678B (en) | 2013-11-27 |
Family
ID=46006618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104442680A Active 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102443678B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177219A (en) * | 2015-08-19 | 2015-12-23 | 山东西王特钢有限公司 | Low-phosphorous 4Cr5MoSiV1 steel manufactured through electric converter and manufacturing method |
| CN106498122A (en) * | 2016-10-21 | 2017-03-15 | 东北特钢集团大连高合金棒线材有限责任公司 | The method of EBT electric arc furnace smeltings nickel and stainless steel series |
| CN106755725A (en) * | 2016-12-30 | 2017-05-31 | 张昌剑 | The method and melting furnace of chrome ore iron-bath molten reduction production chromium stainless steel mother liquor |
| CN107419055A (en) * | 2017-08-16 | 2017-12-01 | 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 |
| CN108411064A (en) * | 2018-04-11 | 2018-08-17 | 成都先进金属材料产业技术研究院有限公司 | The method of waste steel for electric furnace preheating |
| CN111094597A (en) * | 2017-09-28 | 2020-05-01 | 大阳日酸株式会社 | Method for operating melting refining furnace and melting refining furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003104508A1 (en) * | 2002-06-11 | 2003-12-18 | The Boc Group Plc | Refining ferroalloys |
| CN1796586A (en) * | 2004-12-27 | 2006-07-05 | 宝钢集团上海第一钢铁有限公司 | Technique for smelting mother liquor of stainless steel from electric furnace |
-
2011
- 2011-12-27 CN CN2011104442680A patent/CN102443678B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003104508A1 (en) * | 2002-06-11 | 2003-12-18 | The Boc Group Plc | Refining ferroalloys |
| CN1796586A (en) * | 2004-12-27 | 2006-07-05 | 宝钢集团上海第一钢铁有限公司 | Technique for smelting mother liquor of stainless steel from electric furnace |
Non-Patent Citations (3)
| Title |
|---|
| CHRISTOPHER FARMER 等: "电炉JetBOxTM技术的发展", 《钢铁》, vol. 42, no. 1, 31 January 2007 (2007-01-31) * |
| 杜俊峰: "现代电炉多功能炉壁碳氧喷枪技术的发展", 《第七届（2009）中国钢铁年会论文集》, 31 December 2009 (2009-12-31), pages 252 - 258 * |
| 王广连 等: "现代电弧炉高效低耗炼钢技术在我国的应用与发展", 《山东省金属学会2009年炼钢学术交流会议论文集》, 31 December 2009 (2009-12-31), pages 57 - 61 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177219A (en) * | 2015-08-19 | 2015-12-23 | 山东西王特钢有限公司 | Low-phosphorous 4Cr5MoSiV1 steel manufactured through electric converter and manufacturing method |
| CN106498122A (en) * | 2016-10-21 | 2017-03-15 | 东北特钢集团大连高合金棒线材有限责任公司 | The method of EBT electric arc furnace smeltings nickel and stainless steel series |
| 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 |
| CN106755725A (en) * | 2016-12-30 | 2017-05-31 | 张昌剑 | The method and melting furnace of chrome ore iron-bath molten reduction production chromium stainless steel mother liquor |
| 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 |
| CN107419055A (en) * | 2017-08-16 | 2017-12-01 | 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 |
| CN111094597A (en) * | 2017-09-28 | 2020-05-01 | 大阳日酸株式会社 | Method for operating melting refining furnace and melting refining furnace |
| CN108411064A (en) * | 2018-04-11 | 2018-08-17 | 成都先进金属材料产业技术研究院有限公司 | The method of waste steel for electric furnace preheating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102443678B (en) | 2013-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102443678B (en) | Method for smelting stainless steel mother liquor with furnace wall carbon-oxygen spray gun in arc furnace | |
| CN106544467B (en) | A kind of high alloy Low-phosphorus Steel method in high molten iron proportion electric furnace smelting | |
| CN100363508C (en) | Electric furnace to converter steel making production process | |
| CN102080136B (en) | Converter smelting technique | |
| CN102534112B (en) | Total-converting steelmaking method of electric furnace | |
| CN102453831B (en) | Method for smelting high-chromium steel and high-chromium steel | |
| CN101696462A (en) | Method for producing low phosphorus steel by smelting semisteel | |
| CN102766726A (en) | Method for smelting stainless steel by high-chrome melt and dephosphorized pre-melt | |
| CN102787195B (en) | Stainless-steel smelting method | |
| CN101660019A (en) | Electric furnace burden process with high efficiency and low cost | |
| CN100507017C (en) | Mother liquid foam slag generating method for smelting stainless steel with electric furnace and dephosphorization melted iron | |
| CN109609717A (en) | A kind of converter steel-smelting technique using porous oxygen lance | |
| CN107419055B (en) | With the process and its mother liquor of stainless steel of smelting mother liquor of stainless steel from electric furnace | |
| CN102965465A (en) | Method for curing converter slag | |
| CN109022675A (en) | A kind of full steel scrap electric arc furnace smelting chemical energy energy supply method | |
| CN104060020B (en) | A kind of dephosphorization method for making steel improving converter terminal molten steel Fe content | |
| CN101619377B (en) | Deslagging and dephosphorizing method of electric stove | |
| CN100494442C (en) | Smelting method for ferrite stainless steel mother solution | |
| CN103642966A (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN103627846A (en) | Method for performing direct alloying to molybdenum oxide for steelmaking | |
| CN102634634B (en) | Method for producing high-alloy low-phosphorous steel used for boiler tube by adopting electric-arc furnace | |
| CN102312044B (en) | Method for smelting with electric furnace | |
| CN105483316A (en) | Direct alloying method of chrome ores in converter | |
| CN105483320A (en) | Low-cost high-efficiency electric furnace charge preparation technique | |
| CN102839255B (en) | Method for rapidly deoxidizing and remaining carbon by secondarily adding melted iron to electric furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |