CN102443669B - Method for smelting high strength plastic product steel - Google Patents
Method for smelting high strength plastic product steel Download PDFInfo
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Abstract
The invention relates to a method for smelting high strength plastic product steel. The method comprises the following steps: 1, pretreating molten iron until the weight ratio of S in the molten iron is equal to or less than 0.005%; 2, converter-smelting until the weight ratio of C in the molten iron is 0.02-0.15%, the weight ratio of Si in the molten iron is 0.01-0.25%, the weight ratio of Mn in the molten iron is 1.8-15.0%, the weight ratio of P in the molten iron is equal to or less than 0.010%, the weight ratio of S in the molten iron is equal to or less than 0.008% and the weight ratio of Al in the molten iron is greater than 0 and equal to or less than 0.04%; 3, carrying out LF treatment until the weight ratio of C in the molten iron is 0.02-0.15%, the weight ratio of Si in the molten iron is 0.01-0.25%, the weight ratio of Mn in the molten iron is 2.0-15.0%, the weight ratio of Al in the molten iron is 0.02-0.04%, the weight ratio of P in the molten iron is equal to or less than 0.012% and the weight ratio of S in the molten iron is equal to or less than 0.002%; 4, carrying out RH vacuum treatment until the weight ratio of C in the molten iron is 0.02-0.15%, the weight ratio of Si in the molten iron is 0.01-0.25%, the weight ratio of Mn in the molten iron is 2.0-15.0%, the weight ratio of Al in the molten iron is 0.02-0.035%, the weight ratio of P in the molten iron is equal to or less than 0.012%, the weight ratio of S in the molten iron is equal to or less than 0.002%, the weight ratio of [H] in the molten iron is equal to or less than 0.0002%, the weight ratio of[O] in the molten iron is equal to or less than 0.0025% and the weight ratio of [N] in the molten iron is equal to or less than 0.0050%; and 5, casting to form a continuous casting or a molded steel ingot. The cost of the method for smelting the high strength plastic product steel is low.
Description
Technical field
The present invention relates to a kind of smelting process of high strength and ductility steel.
Technical background
Along with social economy's development and people's material requisite promote; security requirement to material is more and more higher; the enhancing of meanwhile realizing along with energy dilemma; requirement realizes that by the lightweight mode material significantly saves in engineering is used; and manufacturing cost is more and more lower, the construction of the green conservation-minded society that carries out in an all-round way.Therefore, the high-strength high-plasticity material is the common target of pursuing of material supplier author and project planner.
The conventional steel iron material is broadly divided into two classes from strength and ductility product (being the product of tensile strength (Rm) and plasticity (A)), a kind of is that production history is longer, use also more general ferrous materials, be characterized in mature production technology, stable performance, but strength and ductility product can not satisfy the requirement of high security in engineering construction at 10-20GPa%; Another kind of steel is development in recent years, and strength and ductility product can reach the 60GPa% rank, but needs to add the precious alloy elements such as a large amount of Cr, Ni, Mn, Si and Al in this class ferrous materials production, makes its cost higher.Because alloy content is high, cause its metallurgical production difficulty larger simultaneously, processing performance is also relatively poor simultaneously, thereby has limited it and produced and use.
Summary of the invention
In order to overcome the above-mentioned deficiency of the smelting process that has the high strength and ductility steel now, the invention provides the smelting process of the low high strength and ductility steel of a kind of cost.
The high strength and ductility smelting steel adopts the method for " hot metal pretreatment+converter+LF stove refining+RH vacuum-treat+continuous casting ".
Technical scheme of the present invention is within molten iron is packed converter after pretreatment into, blow in converter, after reaching follow-up refining requirement, the carbon content in molten steel, sulphur content, phosphorus content (dephosphorization treatment) and temperature tap, when molten steel goes out to ladle space 1/3, (manganeseirom is divided into high carbon ferromanganese, mid-carbon fe-mn can to add manganese alloy or electrolytic manganese, contain manganese at 75-80%, all the other are ferro element, also have impurity element P, the S of minute quantity; More than electrolytic manganese contained Mn99.7%, P, S element impurity content were extremely low).Delivering to the LF refining furnace after Argon after stove stirs processes.Hot metal pretreatment, converter smelting, LF process.
The present invention includes following step successively:
The I hot metal pretreatment
After hot metal pretreatment, the weight percent S of S≤0.005% in molten iron;
II converter operation
After converter smelting, in molten steel, the weight percent of the content of C, Si, Mn, P, S and Al is;
C：0.02-0.15％， Si：0.01-0.25％， Mn：1.8-15.0％，
P :≤0.010%, S≤0.008%, 0＜Al≤0.04%; (Al must add as reductor, left behind, but residual quantity can not surpass 0.04%)
III LF operation
In LF refining furnace operation steps:
Ladle was by the furnaceman LF rear first power transmission 10-15 in position minute, then strong mixing (argon blowing rate is not less than 500Nl/min), make the molten steel composition temperature even, then carry out the content of manganese element in the sampling analysis steel, carbon and other (as Si, Al, P, S) element, in the steel sample analysis checkout procedure, electrifying electrodes operates molten steel heating; According in check analysis result and finished product, the manganese content target call is calculated the add-on that (be manganese element, main in steel play strengthening effect) adds indegree and every batch in batches; Add to determine next add-on after answering sampling analysis after alloy, normal circumstances is divided 2-4 time and is added at every turn.All elements content reaches this operation to chemical composition requirement (namely the LF operation is processed rear requirement to chemical composition) and liquid steel temperature (be not less than 1600 ℃, be controlled at 1600-1650 ℃) in steel, changes next procedure over to.
After LF processed, the weight percent of the C of molten steel, Si, Mn, Al, P and S was:
C：0.02-0.15％，Si：0.01-0.25％，Mn：2.0-15.0％，Al：0.02-0.04％，
P：≤0.012％， S≤0.002％。
IV RH vacuum-treat
In RH vacuum-treat operation steps:
Sampling analysis after ladle arrival RH vacuum-treat station, and begin to vacuumize, vacuumizing 3-7 minute, vacuum tightness reaches 100Pa, keeps being no less than 10 minutes under 100Pa vacuum tightness; Finish vacuum, sampling analysis, the weight percent of carbon, silicon, manganese, phosphorus, aluminium, sulphur and gas is tapped after reaching target, and molten steel send continuous casting working procedure to carry out continuous casting production.
After the RH vacuum-treat, the C of molten steel, Si, Mn, Al, P, S, [H], [O] are respectively with the weight percent of [N]:
C：0.02-0.15％， Si：0.01-0.25％， Mn：2.0-15.0％， Al：0.02-0.035％，
P：≤0.012％， S≤0.002％， [H]≤0.0002％， [O]≤0.0025％，
[N]≤0.0050％。
Then pour into continuously cast bloom or mould and annotate steel ingot.
The smelting process of above-mentioned high strength and ductility steel, in step Step II I, after Step II I LF operation or step IV RH vacuum-treat, other in molten steel is the trace alloying element that Fe and other performance requriements add.
The smelting process of above-mentioned high strength and ductility steel, in step Step II I, the high strength and ductility steel adds indegree and determines according to practical situation with each add-on because it is slightly different to finished product manganese content and carbon content requirement.
The smelting process of above-mentioned high strength and ductility steel, its steps characteristic is:
The I hot metal pretreatment
The enter the station weight percent of hot metal composition and the requirement of temperature is:
C：1.5-6.5％， Si：0.15-0.75％， Mn：0.10-0.20％，
P：0.050-0.090％， S：0.025-0.045％；
All the other are Fe and other submember and inevitable impurity, T:1300 ± 30 ℃;
Enter the station and skim, by taking off the S operation, [S] content in molten iron is processed S≤0.005%, processing finishes to scratch clean slag; Treatment time is no less than 25min, the per-cent of pre-treatment departures hot metal composition, temperature and weight:
C：2.5-5.5％， Si：0.15-0.75％， Mn：0.10-0.20％，
P：0.050-0.090％， S：0.0015-0.0025％；
All the other are Fe and other submember and inevitable impurity, T:1270 ± 30 ℃.
II converter operation
Preprocessed molten iron is packed in top and bottom combined blown converter, then with hopper add special-purpose steel scrap (special-purpose steel scrap refers to: P≤0.025%, S≤0.015%, the cleaning high-quality steel scrap of Cr, Ni, Cu≤0.15%) and weight 0≤molybdenum-iron.Oxygen decarburization, intensification, the omnidistance argon bottom-blowing of converting process bottom blowing, process add lime, light dolomite and ferrovanadium and weight 0≤through burning magnesium ball.1700 ± 30 ℃ of terminal temperatures, the weight percent of the C in molten steel, P and S reaches respectively C:0.02-0.06%, and P:0.003-0.007% sets off after S:0.002-0.004%.Before departures, first add electrolytic manganese and aluminium ferromanganese in ladle, when tapping begins to ladle 1/4, add microlith ash and electrolytic manganese, after the tapping end, the ladle surface adds synthetic slag and aluminium powder.(80 tons of converter oxygen consumption 3900-4200m
3, 180 tons of converter oxygen consumption 8400-9400m
3) smelting cycle 40 ± 5min.After stove, temperature is 1620 ± 10 ℃, 4 ± 1 minutes steel time of stream.
After converter smelting, in molten steel, the weight percent of the content of C, Si, Mn, P, S and Al is
C：0.020-0.150％， Si：0.01-0.20％； Mn：2.0-15％， P：0-0.010％，
S:0-0.0040%, Al:0.02-0.03%; All the other are Fe and other submember and inevitable impurity.
Illustrate: be limited under in other submember such as Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element 0 (be that minimum value is 0, contain Mo as embodiment two, embodiment one does not contain Mo) minimum a kind of, general one to four kind, add above-mentioned element can optimize, give prominence to a certain performance of strengthening steel.
III LF operation
Ladle is put in the LF tank car, and the can opening car is to processing the position.1570-1590 ℃ of the temperature of arriving at a station, the thick 70-90mm of slag, headroom 390-410mm.
The LF treatment step is as follows:
1, beginning power transmission 10-15 minute that enters the station, transmission process adds lime and fluorite slag making, adds aluminium powder after the power transmission end, and after strong mixing 3-12 minute thermometric 1570-1590 ℃, sampling analysis.
2, power transmission 5-15 minute for the second time, 1610 ℃-1630 ℃ of thermometrics, or add minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element, sampling analysis.
3, power transmission 3-9 minute for the third time, add electrolytic manganese and aluminium powder, sampling analysis.
4, the 4th time power transmission 2-6 minute, add carbon dust and ferro-aluminum or only add aluminum shot, thermometric 1630-1650 ℃, sampling analysis.
5, departures are front power transmission 1-3 minute, thermometric 1600---and 1640 ℃, departures.
The weight percent of molten steel composition before departures:
C：0.02-0.15％， Si：0.01-0.20％， Mn：2.0-15.0％， P：0-0.010％，
S：0-0.0015％， Al：0.020-0.030％， [N]：0-0.0050％，
All the other for Fe and other submember (as be limited under Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element 0 minimum a kind of) and inevitable impurity.
IV RH vacuum-treat
With overhead traveling crane, ladle is put in the RH tank car, the can opening car is to processing the position.1630-1650 ℃ of the temperature of arriving at a station, the thick 160-200mm of slag;
RH vacuum-treat step is:
1, arrive at a station thermometric 1630-1650 ℃, decide oxygen 5-15ppm, the thick 170-190mm of slag.
2, first inspection by sampling is analyzed and is vacuumized processing again, and the final vacuum degree reached 4 * 10 in 3 minutes
2± 50Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2± 50Pa.
3,5 minutes, 10 minutes difference sampling analysis of vacuum-treat circulation, and according to the target of sampling in 10 minutes with steel grade, add in aluminum shot accent aluminium or Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element a kind of to two kinds.
4, departures predetermination hydrogen 0-1.8ppm, sampling analysis, out-station temperature 1580-1600 ℃.
The weight percent of departures molten steel composition is:
C：0.02-0.15％， Si：0.01-0.20％， Mn：2.0-15.0％， P：0-0.010％，
S：0-0.0015％， Al：0.020-0.030％，[N]：0-0.0050％， [H]：0-0.00015％，
[O]: 0-0.0020%; All the other for Fe and other submember (as Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element lower limit be 0 minimum a kind of) and inevitable impurity.
The V continuous caster pours into the continuously cast bloom of 220 ± 30 * 1500 ± 500 * 8400 ± 3600mm.
The molten steel of above-described embodiment is moldable steel ingot also.
The smelting process of this high strength and ductility steel, mainly contain the relatively low manganese element of cost, can add simultaneously a small amount of selection and add a kind of low cost and high strength ductility balance steel grade of C, Si, Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element (adding above-mentioned element can optimize, give prominence to a certain performance of strengthening steel), can overcome above-mentioned two class steel exists strength and ductility product low, or the high weak point of cost, strength and ductility product is at 20-50GPa%.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
The I hot metal pretreatment
The per-cent of hot metal composition, temperature and the weight of entering the station:
C：4.12％ Si：0.45％ Mn：0.15％ P：0.072％ S：0.020％；
All the other are Fe and other submember and inevitable impurity, T:1300 ℃; 83.2 tons of weight.
Enter the station and skim, (use the spray gun granular magnesium of jetting in the molten iron by taking off S operation, S in molten iron is by S+Mg=(MgS), the MgS floating that generates enters in slag, then by taking off slag operation, the slag of enrichment MgS is pulled out), [S] content in molten iron can be processed S≤0.005% like this, processing finishes to scratch clean slag.Treatment time 30min, pre-treatment departures hot metal composition, temperature and weight:
C：4.10％ Si：0.45％ Mn：0.16％ P：0.072％ S：0.0020％；
All the other are Fe and other submember and inevitable impurity, T:1280 ℃; 83.0 tons of weight.
II converter operation
83.0 tons of preprocessed molten irons are packed in top and bottom combined blown converter, then add 7.0 tons of special-purpose steel scraps with hopper.(steel oxygen consumption per ton is 51Nm in oxygen blast
3) decarburization, intensification, (air supply intensity is 0.03Nm to the omnidistance argon bottom-blowing of converting process bottom blowing
3/ min/t), process adds 5.125 tons, lime, 2.743 tons of light dolomites, 0.594 ton of bauxite.1703 ℃ of terminal temperatures, the C in molten steel, P and S reach respectively C:0.04%,, P:0.005% sets off after S:0.003%.Before departures, first add 1.5 tons of electrolytic manganeses in ladle, 0.3 ton, aluminium ferromanganese when tapping begins to ladle 1/4, adds 0.4 ton of microlith ash, 2.5 tons of electrolytic manganeses, and after tapping finished, the ladle surface added synthetic slag 100Kg, aluminium powder 50Kg.Oxygen consumption 4200m
3, smelting cycle 38min, 82 tons of taps.After stove, temperature is 1617 ℃, 4 minutes and the 10 seconds steel time of stream.(aluminium ferromanganese is reductor herein, and effect is deoxidation, and the electrolytic manganese effect is alloying).
After converter smelting, in molten steel, the weight percent of the content of C, Si, Mn, P, S and Al is:
C：0.096％， Si：0.02％， Mn：4.53％， P：0.009％， S：0.0028％，
Al:0.020%, all the other are Fe and inevitable impurity.
III LF operation
Ladle is put in the LF tank car, and the can opening car is to processing the position.1582 ℃ of the temperature of arriving at a station, the thick 80mm of slag, headroom 400mm.
The LF treatment step is as follows:
1, the beginning power transmission 15 minutes that enters the station, transmission process adds lime 500kg, fluorite 200kg slag making, and power transmission adds aluminium powder 50kg after finishing, and strong mixing is 1583 ℃ of thermometrics (the strong mixing flow is 500Nl/min, and power transmission begins to stir by force after finishing) after 8 minutes, sampling analysis.
2, power transmission 10 minutes for the second time, 1617 ℃ of thermometrics, sampling analysis.
3, power transmission 6 minutes for the third time adds electrolytic manganese 450kg, aluminium powder 20kg, sampling analysis.
4, the 4th power transmission is 4 minutes, adds carbon dust 20kg, ferro-aluminum 60kg, 1640 ℃ of thermometrics, sampling analysis.
5, the front power transmission of departures is 2 minutes and 30 seconds, 1620 ℃ of thermometrics, departures.
Before departures, molten steel composition (weight) is:
C：0.106％， Si：0.01％， Mn：5.16％， P：0.010％， S：0.0010％
Al:0.025%, [N]: 0.0048%, all the other are Fe and inevitable impurity.
IV RH vacuum-treat
With overhead traveling crane, ladle is put in the RH tank car, the can opening car is to processing the position.1641 ℃ of the temperature of arriving at a station, the thick 180mm of slag
RH vacuum-treat step is:
1, the thermometric 1641 that arrives at a station is decided oxygen 12ppm, the thick 180mm of slag.
2, first inspection by sampling is analyzed and is vacuumized processing again, and the final vacuum degree reached 4 * 10 in 3 minutes
2Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2Pa.
3,5 minutes, 10 minutes difference sampling analysis of vacuum-treat circulation, and add aluminum shot 43Kg accent aluminium according to sampling in 10 minutes.
4, departures predetermination hydrogen 1.6ppm, sampling analysis, 1589 ℃ of out-station temperatures.
Departures molten steel composition (weight) per-cent is:
C：0.11％， Si：0.03％， Mn：4.87％， P：0.009％， S：0.0015％，
Al：0.027％， [N]：0.0046％， [H]：0.0001％， [O]：0.0020％；
All the other are Fe and inevitable impurity.
(5) pour into the continuously cast bloom of 220 * 1250 * 7800mm to continuous caster.
The steel of the present embodiment by hot rolling, thermal treatment after strength and ductility product in the 28-35GPa% scope.
Embodiment two
The I hot metal pretreatment
The per-cent of hot metal composition, temperature and the weight of entering the station:
C：4.20％ Si：0.40％ Mn：0.12％ P：0.076％ S：0.025％；
All the other are Fe and other submember and inevitable impurity, T:1308; 165.0 tons of weight.
Enter the station and skim, by taking off S operation (principle is identical with embodiment one), [S] content in molten iron can be processed S≤0.005% like this, processing finishes to scratch clean slag.Treatment time 30min, pre-treatment departures hot metal composition, temperature and weight:
C：4.20％ Si：0.40％ Mn：0.12％ P：0.076％ S：0.0018％；
All the other are Fe and other submember and inevitable impurity, T:1275 ℃; Weight 179.582.9 ton.
II converter operation
165.0 tons of preprocessed molten irons are packed in top and bottom combined blown converter, then add 1.125 tons of molybdenum-irons with hopper., 20.0 tons of special-purpose steel scraps.(steel oxygen consumption per ton is 50Nm in oxygen blast
3) decarburization, intensification, (air supply intensity is 0.03Nm to the omnidistance argon bottom-blowing of converting process bottom blowing
3/ min/t) process adds 5.8 tons, lime, 3.1 tons of light dolomites, 0.5 ton of calcined magnesite ball.1710 ℃ of terminal temperatures, the C in molten steel, P and S reach respectively C:0.04%,, P:0.005% sets off after S:0.003%.Before departures, first add 10.0 tons of electrolytic manganeses in ladle, 1.0 tons, aluminium ferromanganese when tapping begins to ladle 1/4, adds 0.9 ton of microlith ash, 11.8 tons of electrolytic manganeses, and after tapping finished, the ladle surface added synthetic slag 100Kg, aluminium powder 50Kg.Oxygen consumption 8610m
3, smelting cycle 37min, 195.2 tons of taps.After stove, temperature is 1610 ℃, the 4 minutes steel time of stream.
After converter smelting, the weight percent of the composition of molten steel is:
C：0.090％， Si：0.021％， Mn：11.20％， P：0.008％， S：0.0025％，
Al:0.020%, Mo:0.30%, all the other are Fe and inevitable impurity.
III LF operation
Ladle is put in the LF tank car, and the can opening car is to processing the position.1575 ℃ of the temperature of arriving at a station, the thick 81mm of slag, headroom 395mm.
The LF treatment step is as follows:
1, the beginning power transmission 15 minutes that enters the station, transmission process adds lime 500kg, fluorite 200kg slag making, adds aluminium powder 113kg after power transmission finishes, strong mixing after 8 minutes 1575 ℃ of thermometrics (the strong mixing flow is 500Nl/min, power transmission begins to stir by force after finishing), sampling analysis.
2, power transmission 10 minutes for the second time, 1615 ℃ of thermometrics add 0.200 ton of ferro-niobium, sampling analysis.
3, power transmission 6 minutes for the third time adds electrolytic manganese 450kg, aluminium powder 20kg, sampling analysis.
4, the 4th power transmission is 5 minutes, adds aluminum shot 135kg, 1635 ℃ of thermometrics, sampling analysis.
5, the front power transmission of departures is 2 minutes and 40 seconds, 1640 ℃ of thermometrics, departures.
Before departures, molten steel composition (weight) is:
C：0.089％， Si：0.02％， Mn：11.7％， P：0.008％，S：0.0008％
Al：0.030％， [N]：0.0045％，Nb：0.06％， Mo：0.30％，
All the other are Fe and inevitable impurity.
IV RH vacuum-treat
With overhead traveling crane, ladle is put in the RH tank car, the can opening car is to processing the position.1630 ℃ of the temperature of arriving at a station, the thick 176mm of slag
RH vacuum-treat step is:
1, arrive at a station 1630 ℃ of thermometrics are decided oxygen 14ppm, the thick 180mm of slag.
2, first inspection by sampling is analyzed and is vacuumized processing again, and the final vacuum degree reached 4 * 10 in 3 minutes
2Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2Pa.
3, the vacuum-treat circulation added 0.563 ton of ferrotianium, 0.034 ton of ferro-boron, 10 minutes sampling analysis after 5 minutes.
4, departures predetermination hydrogen 1.2ppm, sampling analysis, 1586 ℃ of out-station temperatures.
Departures molten steel compositions (weight) are:
C：0.089％， Si：0.02％， Mn：11.7％， P：0.008％，
S：0.0015％ Al：0.027％， Nb：0.06％， Ti：0.14％， Mo：0.30％， B：0.0020％，
[N]：0.0045％， [H]：0.0001％， [O]：0.0020％；
All the other are Fe and inevitable impurity.
(5) pour into the continuously cast bloom of 230 * 1500 * 9800mm to continuous caster.
The steel of the present embodiment by hot rolling, thermal treatment after strength and ductility product in the 28-35GPa% scope.
Claims (3)
1. the smelting process of a high strength and ductility steel, its steps characteristic is:
IHot metal pretreatment
The enter the station weight percent of hot metal composition and the requirement of temperature is:
C： 1.5—6.5%， Si：0.15—0.75%， Mn：0.10—0.20%，
P：0.050—0.090%， S：0.025—0.045%；
All the other are Fe and other submember and inevitable impurity, T:1300 ± 30 ℃;
Enter the station and skim, by taking off the S operation, [S] content in molten iron is processed S≤0.005%, processing finishes to scratch clean slag; Treatment time is no less than 25min, the per-cent of pre-treatment departures hot metal composition, temperature and weight:
C： 2.5—5.5%， Si：0.15—0.75%， Mn：0.10—0.20%，
P：0.050—0.090%， S：0.0015—0.0025%；
All the other are Fe and other submember and inevitable impurity, T:1270 ± 30 ℃;
IIThe converter operation
Preprocessed molten iron is packed in top and bottom combined blown converter, then add special-purpose steel scrap with hopper, be i.e. P≤0.025%, S≤0.015%, the cleaning high-quality steel scrap of Cr, Ni, Cu≤0.15%; Oxygen decarburization, intensification, the omnidistance argon bottom-blowing of converting process, process adds lime, light dolomite and ferrovanadium; 1700 ± 30 ℃ of terminal temperatures, the weight percent of the C in molten steel, P and S reaches respectively C:0.02-0.06%, P:0.003-0.007%, the rear departures of S:0.002-0.004%; Before departures, first add electrolytic manganese and aluminium ferromanganese in ladle, when tapping begins to ladle 1/4, add microlith ash and electrolytic manganese, after the tapping end, the ladle surface adds synthetic slag and aluminium powder; Smelting cycle 40 ± 5min; After stove, temperature is 1620 ± 10 ℃, 4 ± 1 minutes steel time of stream;
After converter smelting, in molten steel, the weight percent of the content of C, Si, Mn, P, S and Al is
C：0.020—0.150%， Si：0.01—0.20%； Mn：2.0—15%， P：0—0.010%，
S:0-0.0040%, Al:0.02-0.03%; All the other are Fe and other submember and inevitable impurity;
IIIThe LF operation
Ladle is put in the LF tank car, and the can opening car is to processing the position; 1570-1590 ℃ of the temperature of arriving at a station, the thick 70-90mm of slag, headroom 390-410mm;
The LF treatment step is as follows:
A, beginning power transmission 10-15 minute that enters the station, transmission process adds lime and fluorite slag making, adds aluminium powder after the power transmission end, strong mixing 1570-1590 ℃ of thermometrics after 3-12 minutes, sampling analysis;
B, power transmission 5-15 minutes for the second time, 1610 ℃-1630 ℃ of thermometrics, sampling analysis;
C, power transmission 3-9 minutes for the third time add electrolytic manganese and aluminium powder, sampling analysis;
D, the 4th power transmission 2-6 minutes add carbon dust and ferro-aluminum, 1630-1650 ℃ of thermometrics, sampling analysis;
Before e, departures, power transmission is 1-3 minutes, thermometric 1600---and 1640 ℃, departures;
The weight percent of molten steel composition before departures:
C：0.02—0.15%， Si：0.01-0.20%， Mn：2.0—15.0%，P：0—0.010%， S：0—0.0015%， Al：0.020—0.030%， [N]：0-0.0050%，
All the other are Fe and other submember and inevitable impurity;
IVThe RH vacuum-treat
With overhead traveling crane, ladle is put in the RH tank car, the can opening car is to processing the position; 1630-1650 ℃ of the temperature of arriving at a station, the thick 160-200mm of slag;
RH vacuum-treat step is:
A, 1630-1650 ℃ of the thermometrics of arriving at a station are decided oxygen 5-15ppm, thick 170-190 ㎜ of slag;
B, first inspection by sampling are analyzed and are vacuumized processing again, and the final vacuum degree reached 4 * 10 in 3 minutes
2± 50 Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2± 50 Pa;
C, 5 minutes, 10 minutes difference sampling analysis of vacuum-treat circulation, and according to the target of sampling in 10 minutes with steel grade, add aluminum shot and transfer aluminium;
D, departures predetermination hydrogen 0-1.8ppm, sampling analysis, out-station temperature 1580-1600 ℃;
The weight percent of departures molten steel composition is:
C:0.02-0.15%, Si:0.01-0.20%, Mn:2.0-15.0%, P:0-0.010%, S:0-0.0015%, Al:0.020-0.030%, [N]: 0-0.0050%, [H]: 0-0.00015%, [O]: 0-0.0020%; All the other are Fe and other submember and inevitable impurity;
Then pour into continuously cast bloom or mould and annotate steel ingot.
2. the smelting process of high strength and ductility steel according to claim 1, is characterized in that: in step
IIIIn, the high strength and ductility steel adds indegree and determines according to practical situation with each add-on because it is slightly different to finished product manganese content and carbon content requirement.
3. the smelting process of high strength and ductility steel according to claim 1, its steps characteristic is:
IHot metal pretreatment
The enter the station weight percent of hot metal composition and the requirement of temperature is:
C： 1.5—6.5%， Si：0.15—0.75%， Mn：0.10—0.20%，
P：0.050—0.090%， S：0.025—0.045%；
All the other are Fe and other submember and inevitable impurity, T:1300 ± 30 ℃;
Enter the station and skim, by taking off the S operation, [S] content in molten iron is processed S≤0.005%, processing finishes to scratch clean slag; Treatment time is no less than 25min, the per-cent of pre-treatment departures hot metal composition, temperature and weight:
C： 2.5—5.5%， Si：0.15—0.75%， Mn：0.10—0.20%，
P：0.050—0.090%， S：0.0015—0.0025%；
All the other are Fe and other submember and inevitable impurity, T:1270 ± 30 ℃;
IIThe converter operation
Preprocessed molten iron is packed in top and bottom combined blown converter, then add molybdenum-iron and special-purpose steel scrap with hopper; Oxygen decarburization, intensification, the omnidistance argon bottom-blowing of converting process, process adds lime, light dolomite and calcined magnesite ball; 1700 ± 30 ℃ of terminal temperatures, the weight percent of the C in molten steel, P and S reaches respectively C:0.02-0.06%, P:0.003-0.007%, the rear departures of S:0.002-0.004%; Before departures, first add electrolytic manganese and aluminium ferromanganese in ladle, when tapping begins to ladle 1/4, add microlith ash and electrolytic manganese, after the tapping end, the ladle surface adds synthetic slag and aluminium powder; Smelting cycle 40 ± 5min; After stove, temperature is 1620 ± 10 ℃, 4 ± 1 minutes steel time of stream;
After converter smelting, in molten steel, the weight percent of the content of C, Si, Mn, P, S and Al is
C：0.020—0.150%， Si：0.01—0.20%； Mn：2.0—15%， P：0—0.010%，
S：0—0.0040%， Al：0.02—0.03%；
All the other are Fe and other submember and inevitable impurity;
Other submember is minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element;
IIIThe LF operation
Ladle is put in the LF tank car, and the can opening car is to processing the position; 1570-1590 ℃ of the temperature of arriving at a station, the thick 70-90mm of slag, headroom 390-410mm;
The LF treatment step is as follows:
A, beginning power transmission 10-15 minute that enters the station, transmission process adds lime and fluorite slag making, adds aluminium powder after the power transmission end, strong mixing 1570-1590 ℃ of thermometrics after 3-12 minutes, sampling analysis;
B, power transmission 5-15 minutes for the second time, 1610 ℃-1630 ℃ of thermometrics add minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element, sampling analysis;
C, power transmission 3-9 minutes for the third time add electrolytic manganese and aluminium powder, sampling analysis;
D, the 4th power transmission 2-6 minutes add aluminum shot, 1630-1650 ℃ of thermometrics, sampling analysis;
Before e, departures, power transmission is 1-3 minutes, thermometric 1600---and 1640 ℃, departures;
The weight percent of molten steel composition before departures:
C：0.02—0.15%， Si：0.01-0.20%， Mn：2.0—15.0%，P：0—0.010%， S：0—0.0015%， Al：0.020—0.030%， [N]：0-0.0050%，
All the other are Fe and other submember and inevitable impurity;
Other submember is minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element;
IVThe RH vacuum-treat
With overhead traveling crane, ladle is put in the RH tank car, the can opening car is to processing the position; 1630-1650 ℃ of the temperature of arriving at a station, the thick 160-200mm of slag;
RH vacuum-treat step is:
A, 1630-1650 ℃ of the thermometrics of arriving at a station are decided oxygen 5-15ppm, thick 170-190 ㎜ of slag;
B, first inspection by sampling are analyzed and are vacuumized processing again, and the final vacuum degree reached 4 * 10 in 3 minutes
2± 50 Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2± 50 Pa;
C, 5 minutes, 10 minutes difference sampling analysis of vacuum-treat circulation, and according to the target of sampling in 10 minutes with steel grade, add Nb, V
, Ti, Mo,
B, in Cr, Ni, Cu, Re, Ca element one to two kind;
D, departures predetermination hydrogen 0-1.8ppm, sampling analysis, out-station temperature 1580-1600 ℃;
The weight percent of departures molten steel composition is:
C:0.02-0.15%, Si:0.01-0.20%, Mn:2.0-15.0%, P:0-0.010%, S:0-0.0015%, Al:0.020-0.030%, [N]: 0-0.0050%, [H]: 0-0.00015%, [O]: 0-0.0020%; All the other are Fe and other submember and inevitable impurity;
Other submember is minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element.
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| CN106811570B (en) * | 2015-12-02 | 2019-02-26 | 鞍钢股份有限公司 | Smelting method of medium-carbon high-manganese steel |
| CN108950130A (en) * | 2018-07-27 | 2018-12-07 | 北京科技大学 | A kind of mass production smelting process of low oxygen and high purity steel |
| CN111945054A (en) * | 2020-08-20 | 2020-11-17 | 山东华星新材料科技有限公司 | High-aluminum medium-manganese steel and smelting method thereof |
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| US6976835B1 (en) * | 2005-02-17 | 2005-12-20 | Richard Tucker | Manufacturing system and process |
| CN101381839A (en) * | 2008-10-17 | 2009-03-11 | 中国科学院固体物理研究所 | High strength and ductility alloy steel and heat treatment technology thereof |
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| US6976835B1 (en) * | 2005-02-17 | 2005-12-20 | Richard Tucker | Manufacturing system and process |
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