CN102443669A - Method for smelting high strength plastic product steel - Google Patents
Method for smelting high strength plastic product steel Download PDFInfo
- Publication number
- CN102443669A CN102443669A CN2011103882325A CN201110388232A CN102443669A CN 102443669 A CN102443669 A CN 102443669A CN 2011103882325 A CN2011103882325 A CN 2011103882325A CN 201110388232 A CN201110388232 A CN 201110388232A CN 102443669 A CN102443669 A CN 102443669A
- Authority
- CN
- China
- Prior art keywords
- steel
- add
- vacuum
- station
- departures
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
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 constantly development and the lifting of people's material requisite of social economy; Security requirement to material is increasingly high; The enhancing of meanwhile realizing along with energy dilemma; Requirement realizes that through the lightweight mode material significantly practices thrift in practical applications, 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 types 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 the engineering construction at 10-20GPa%; Another kind of steel is a development in recent years, and strength and ductility product can reach the 60GPa% rank, but this type ferrous materials needs a large amount of valuable alloying elements such as Cr, Ni, Mn, Si and Al of interpolation in producing, and makes its cost higher.Because alloy content is high, cause its metallurgical production difficulty bigger simultaneously, use characteristics 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 present 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 molten iron is packed converter into after pre-treatment in; In converter, blow, after the carbon content in the molten steel, sulphur content, phosphorus content (dephosphorization treatment) and temperature reach follow-up refining requirement, 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; Electrolytic manganese contains more than the Mn99.7%, and P, S element impurity content are extremely low).After Argon behind the stove stirs, delivering to the LF refining furnace handles.Hot metal pretreatment, converter smelting, LF handle.
The present invention includes following sequential steps:
The I hot metal pretreatment
After the hot metal pretreatment, weight percent S≤0.005% of S in the molten iron;
II converter operation
Behind the converter smelting, the weight percent of the content of C, Si, Mn, P, S and Al does in the molten steel;
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 send electric 10-15 minute earlier behind furnaceman LF position; Strong mixing then (argon blowing rate is not less than 500Nl/min); Make the molten steel composition temperature even; Carry out the content of manganese element in the sampling analysis steel, carbon and other (like Si, Al, P, S) element then, in the steel sample analysis checkout procedure, electrifying electrodes is operated molten steel heating; According in check analysis result and the finished product 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; Determine next add-on after answering sampling analysis behind each adding alloy, normal circumstances is divided 2-4 adding.Treat that all elements content reaches this operation to chemical ingredients requirement (just the LF operation is handled the requirement of back to chemical ingredients) and liquid steel temperature (be not less than 1600 ℃, be controlled at 1600-1650 ℃) in the steel, change next procedure over to.
After LF handled, 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 behind the ladle arrival RH vacuum-treat station, and begin to vacuumize, vacuumizing 3-7 minute, vacuum tightness reaches 100Pa, under 100Pa vacuum tightness, keeps being no less than 10 minutes; 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.
The C of molten steel, Si, Mn, Al, P, S, [H], [O] are respectively with the weight percent of [N] after the RH vacuum-treat:
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％。
Pour into continuously cast bloom or mould then and annotate steel ingot.
The smelting process of above-mentioned high strength and ductility steel, in step III, after Step II I LF operation or the step IV RH vacuum-treat, other in the 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 III, 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 unavoidable impurities, T:1300 ± 30 ℃;
Enter the station and skim, through taking off the S operation, [S] content in the molten iron is handled 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 unavoidable impurities, T:1270 ± 30 ℃.
II converter operation
Preprocessed molten iron is packed in the 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 the molten steel, P and S reaches C:0.02-0.06% respectively, and P:0.003-0.007% sets off behind the S:0.002-0.004%.Before the departures, in ladle, add electrolytic manganese and aluminium ferromanganese earlier, when tapping begins to ladle 1/4, add microlith ash and electrolytic manganese, after tapping finished, the ladle surface added 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.Temperature is 1620 ± 10 ℃ behind the stove, 4 ± 1 minutes steel time of stream.
Behind the converter smelting, the weight percent of the content of C, Si, Mn, P, S and Al does in the molten steel
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 unavoidable impurities.
Explain: following in other submember such as Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element be limited to 0 (be that minimum value is 0; Contain Mo like embodiment two; Embodiment one does not contain Mo) minimum a kind of; General one to four kind, add above-mentioned element and can optimize, give prominence to a certain performance of strengthening steel.
III LF operation
Ladle is put in the LF tank car, drives tank car to handling 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 following:
1, enter the station and begin to send electric 10-15 minute, transmission process adds lime and fluorite slag making, adds aluminium powder after sending electricity to finish, and after strong mixing 3-12 minute thermometric 1570-1590 ℃, sampling analysis.
2, for the second time send electric 5-15 minute, 1610 ℃-1630 ℃ of thermometrics, or add minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element, sampling analysis.
3, send electric 3-9 minute for the third time, add electrolytic manganese and aluminium powder, sampling analysis.
4, send electric 2-6 minute the 4th time, add carbon dust and ferro-aluminum or only add aluminum shot, thermometric 1630-1650 ℃, sampling analysis.
5, send electric 1-3 minute, thermometric 1600 before the departures---1640 ℃, departures.
The weight percent of molten steel composition before the 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 Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, Ca element following be limited to 0 minimum a kind of) and unavoidable impurities.
IV RH vacuum-treat
With overhead traveling crane ladle is put in the RH tank car, drives tank car to handling the position.1630-1650 ℃ of the temperature of arriving at a station, the thick 160-200mm of slag;
RH vacuum-treat step is:
1, arrives 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 of vacuum-treat circulation sampling analysis, and, add in aluminum shot accent aluminium or Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element a kind of to two kinds according to the target of sampling in 10 minutes with steel grade.
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 unavoidable impurities.
The V continuous caster pours into the continuously cast bloom of 220 ± 30 * 1500 ± 500 * 8400 ± 3600mm.
The also moldable steel ingot of the molten steel of the foregoing description.
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 (add above-mentioned element and can optimize, give prominence to a certain performance of strengthening steel); Can overcome above-mentioned two types of steel and exist strength and ductility product low, or the high weak point of cost, strength and ductility product is at 20-50GPa%.
Embodiment
Specify embodiment of the present invention below in conjunction with embodiment, but 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 unavoidable impurities, T:1300 ℃; 83.2 tons of weight.
Enter the station and skim; (use the spray gun particle magnesium of in molten iron, jet, the S in the molten iron is through S+Mg=(MgS), in the MgS of the generation come-up entering slag through taking off S operation; Then through taking off slag operation; The slag of enrichment MgS is pulled out), can [S] content in the molten iron be handled 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 unavoidable impurities, T:1280 ℃; 83.0 tons of weight.
II converter operation
83.0 tons of preprocessed molten irons are packed in the top and bottom combined blown converter, add 7.0 tons of special-purpose steel scraps with hopper then.(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 in lime, 2.743 tons of light dolomites, 0.594 ton of bauxite.1703 ℃ of terminal temperatures, the C in the molten steel, P and S reach C:0.04% respectively,, P:0.005% sets off behind the S:0.003%.Before the departures, in ladle, add 1.5 tons of electrolytic manganeses earlier, 0.3 ton in 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.Temperature is 1617 ℃ behind the stove, 4 minutes and the 10 seconds steel time of stream.(aluminium ferromanganese is reductor here, and effect is deoxidation, and the electrolytic manganese effect is an alloying).
Behind the converter smelting, the weight percent of the content of C, Si, Mn, P, S and Al is in the molten steel:
C：0.096％， Si：0.02％， Mn：4.53％， P：0.009％， S：0.0028％，
Al:0.020%, all the other are Fe and unavoidable impurities.
III LF operation
Ladle is put in the LF tank car, drives tank car to handling the position.1582 ℃ of the temperature of arriving at a station, the thick 80mm of slag, headroom 400mm.
The LF treatment step is following:
1, enter the station and begin to send electricity 15 minutes, transmission process adds lime 500kg, fluorite 200kg slag making, adds aluminium powder 50kg after sending electricity to finish, strong mixing 1583 ℃ of thermometrics after 8 minutes (the strong mixing flow is 500Nl/min, send electricity to finish then begin to stir by force), sampling analysis.
2, send electricity 10 minutes, 1617 ℃ of thermometrics, sampling analysis for the second time.
3, send electricity 6 minutes for the third time, add electrolytic manganese 450kg, aluminium powder 20kg, sampling analysis.
4, send electricity 4 minutes for the 4th time, add carbon dust 20kg, ferro-aluminum 60kg, 1640 ℃ of thermometrics, sampling analysis.
5, send electricity 2 minutes and 30 seconds before the departures, 1620 ℃ of thermometrics, departures.
Molten steel composition (weight) is before the departures:
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 unavoidable impurities.
IV RH vacuum-treat
With overhead traveling crane ladle is put in the RH tank car, drives tank car to handling 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, vacuum-treat circulation 5 minutes, 10 minutes sampling analysis respectively, and add aluminum shot 43Kg according to sampling in 10 minutes and transfer aluminium.
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 unavoidable impurities.
(5) pour into the continuously cast bloom of 220 * 1250 * 7800mm to continuous caster.
The steel of present embodiment through 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 unavoidable impurities, T:1308; 165.0 tons of weight.
Enter the station and skim, through taking off S operation (principle is identical with embodiment one), can [S] content in the molten iron be handled 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 unavoidable impurities, T:1275 ℃; Weight 179.582.9 ton.
II converter operation
165.0 tons of preprocessed molten irons are packed in the top and bottom combined blown converter, add 1.125 tons of molybdenum-irons with hopper then., 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 in lime, 3.1 tons of light dolomites, 0.5 ton of calcined magnesite ball.1710 ℃ of terminal temperatures, the C in the molten steel, P and S reach C:0.04% respectively,, P:0.005% sets off behind the S:0.003%.Before the departures, in ladle, add 10.0 tons of electrolytic manganeses earlier, 1.0 tons in 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.Temperature is 1610 ℃ behind the stove, the 4 minutes steel time of stream.
Behind the 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 unavoidable impurities.
III LF operation
Ladle is put in the LF tank car, drives tank car to handling the position.1575 ℃ of the temperature of arriving at a station, the thick 81mm of slag, headroom 395mm.
The LF treatment step is following:
1, enter the station and begin to send electricity 15 minutes, transmission process adds lime 500kg, fluorite 200kg slag making, adds aluminium powder 113kg after sending electricity to finish, strong mixing 1575 ℃ of thermometrics after 8 minutes (the strong mixing flow is 500Nl/min, send electricity to finish then begin to stir by force), sampling analysis.
2, send electricity 10 minutes for the second time, 1615 ℃ of thermometrics add 0.200 ton of ferro-niobium, sampling analysis.
3, send electricity 6 minutes for the third time, add electrolytic manganese 450kg, aluminium powder 20kg, sampling analysis.
4, send electricity 5 minutes for the 4th time, add aluminum shot 135kg, 1635 ℃ of thermometrics, sampling analysis.
5, send electricity 2 minutes and 40 seconds before the departures, 1640 ℃ of thermometrics, departures.
Molten steel composition (weight) is before the departures:
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 unavoidable impurities.
IV RH vacuum-treat
With overhead traveling crane ladle is put in the RH tank car, drives tank car to handling 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 adds 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 unavoidable impurities.
(5) pour into the continuously cast bloom of 230 * 1500 * 9800mm to continuous caster.
The steel of present embodiment through hot rolling, thermal treatment after strength and ductility product in the 28-35GPa% scope.
Claims (5)
1. the smelting process of a high strength and ductility steel, it comprises following sequential steps:
The I hot metal pretreatment
After the hot metal pretreatment, weight percent S≤0.005% of S in the molten iron;
II converter operation
Behind the converter smelting, the weight percent of the content of C, Si, Mn, P, S and Al does in the molten steel;
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％；
III LF operation
In LF refining furnace operation steps:
Ladle send electric 10-15 minute earlier behind furnaceman LF position, strong mixing then makes the molten steel composition temperature even, carries out the content of manganese element, carbon and other element in the sampling analysis steel then, and in the steel sample analysis checkout procedure, electrifying electrodes is operated molten steel heating; According in check analysis result and the finished product manganese content target call being calculated, add the add-on of indegree and every batch in batches; Determine next add-on after answering sampling analysis behind each adding alloy, normal circumstances is divided 2-4 adding; Treat that all elements content reaches this operation to chemical ingredients requirement and liquid steel temperature in the steel,, change next procedure over to;
After LF handled, 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 behind the ladle arrival RH vacuum-treat station, and begin to vacuumize, vacuumizing 3-7 minute, vacuum tightness reaches 100Pa, under 100Pa vacuum tightness, keeps being no less than 10 minutes; 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;
The C of molten steel, Si, Mn, Al, P, S, [H], [O] are respectively with the weight percent of [N] after the RH vacuum-treat:
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％。
Pour into continuously cast bloom or mould then and annotate steel ingot.
2. the smelting process of high strength and ductility steel according to claim 1 is characterized in that: after LF operation or the step IV RH vacuum-treat, other in the molten steel is the trace alloying element that Fe and other performance requriements add in step III.
3. the smelting process of high strength and ductility steel according to claim 1 and 2 is characterized in that: in step III, 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.
4. the smelting process of high strength and ductility steel according to claim 1 and 2, 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 unavoidable impurities, T:1300 ± 30 ℃;
Enter the station and skim, through taking off the S operation, [S] content in the molten iron is handled 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 unavoidable impurities, T:1270 ± 30 ℃;
II converter operation
Preprocessed molten iron is packed in the top and bottom combined blown converter, add special-purpose steel scrap with hopper then, 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 bottom blowing, process adds lime, light dolomite and ferrovanadium; 1700 ± 30 ℃ of terminal temperatures, the weight percent of the C in the molten steel, P and S reaches C:0.02-0.06% respectively, and P:0.003-0.007% sets off behind the S:0.002-0.004%; Before the departures, in ladle, add electrolytic manganese and aluminium ferromanganese earlier, when tapping begins to ladle 1/4, add microlith ash and electrolytic manganese, after tapping finished, the ladle surface added synthetic slag and aluminium powder; Smelting cycle 40 ± 5min; Temperature is 1620 ± 10 ℃ behind the stove, 4 ± 1 minutes steel time of stream;
Behind the converter smelting, the weight percent of the content of C, Si, Mn, P, S and Al is C:0.020-0.150% in the molten steel, 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 unavoidable impurities;
III LF operation
Ladle is put in the LF tank car, drives tank car to handling 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 following:
A, entering the station begins to send electric 10-15 minute, and transmission process adds lime and fluorite slag making, adds aluminium powder after sending electricity to finish, and after strong mixing 3-12 minute thermometric 1570-1590 ℃, sampling analysis;
B, the second time are sent electric 5-15 minute, 1610 ℃-1630 ℃ of thermometrics, sampling analysis;
C, send electric 3-9 minute for the third time, add electrolytic manganese and aluminium powder, sampling analysis;
D, send electric 2-6 minute the 4th time, add carbon dust and ferro-aluminum, thermometric 1630-1650 ℃, sampling analysis;
Send electric 1-3 minute, thermometric 1600 before e, the departures---1640 ℃, departures;
The weight percent of molten steel composition before the 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 unavoidable impurities;
IV RH vacuum-treat
With overhead traveling crane ladle is put in the RH tank car, drives tank car to handling the position; 1630-1650 ℃ of the temperature of arriving at a station, the thick 160-200mm of slag;
RH vacuum-treat step is:
A, arrive at a station thermometric 1630-1650 ℃, decide oxygen 5-15ppm, the thick 170-190mm 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± 50Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2± 50Pa;
C, 5 minutes, 10 minutes difference of vacuum-treat circulation sampling analysis, 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 unavoidable impurities.
5. the smelting process of high strength and ductility steel according to claim 1 and 2, 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 unavoidable impurities, T:1300 ± 30 ℃;
Enter the station and skim, through taking off the S operation, [S] content in the molten iron is handled 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 unavoidable impurities, T:1270 ± 30 ℃;
II converter operation
Preprocessed molten iron is packed in the top and bottom combined blown converter, add molybdenum-iron and special-purpose steel scrap with hopper then; Oxygen decarburization, intensification, the omnidistance argon bottom-blowing of converting process bottom blowing, process adds lime, light dolomite and warp and burns the magnesium ball; 1700 ± 30 ℃ of terminal temperatures, the weight percent of the C in the molten steel, P and S reaches C:0.02-0.06% respectively, and P:0.003-0.007% sets off behind the S:0.002-0.004%; Before the departures, in ladle, add electrolytic manganese and aluminium ferromanganese earlier, when tapping begins to ladle 1/4, add microlith ash and electrolytic manganese, after tapping finished, the ladle surface added synthetic slag and aluminium powder; Smelting cycle 40 ± 5min; Temperature is 1620 ± 10 ℃ behind the stove, 4 ± 1 minutes steel time of stream;
Behind the converter smelting, the weight percent of the content of C, Si, Mn, P, S and Al does in the molten steel
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 unavoidable impurities;
Other submember is minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element;
III LF operation
Ladle is put in the LF tank car, drives tank car to handling 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 following:
A, entering the station begins to send electric 10-15 minute, and transmission process adds lime and fluorite slag making, adds aluminium powder after sending electricity to finish, and after strong mixing 3-12 minute thermometric 1570-1590 ℃, sampling analysis;
B, for the second time send electric 5-15 minute, 1610 ℃-1630 ℃ of thermometrics add minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element, sampling analysis;
C, send electric 3-9 minute for the third time, add electrolytic manganese and aluminium powder, sampling analysis;
D, send electric 2-6 minute the 4th time, add aluminum shot, thermometric 1630-1650 ℃, sampling analysis;
Send electric 1-3 minute, thermometric 1600 before e, the departures---1640 ℃, departures;
The weight percent of molten steel composition before the 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 unavoidable impurities;
Other submember is minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element;
IV RH vacuum-treat
With overhead traveling crane ladle is put in the RH tank car, drives tank car to handling the position; 1630-1650 ℃ of the temperature of arriving at a station, the thick 160-200mm of slag;
RH vacuum-treat step is:
A, arrive at a station thermometric 1630-1650 ℃, decide oxygen 5-15ppm, the thick 170-190mm 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± 50Pa, vacuum tightness 1 * 10 reached capacity after 6 minutes
2± 50Pa;
C, vacuum-treat circulation 5 minutes, 10 minutes is sampling analysis respectively, and according to the target of sampling in 10 minutes with steel grade, adds in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the 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 unavoidable impurities;
Other submember is minimum a kind of in Nb, V, Ti, Mo, B, Cr, Ni, Cu, Re, the Ca element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110388232 CN102443669B (en) | 2011-11-25 | 2011-11-25 | Method for smelting high strength plastic product steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110388232 CN102443669B (en) | 2011-11-25 | 2011-11-25 | Method for smelting high strength plastic product steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102443669A true CN102443669A (en) | 2012-05-09 |
| CN102443669B CN102443669B (en) | 2013-06-12 |
Family
ID=46006609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110388232 Active CN102443669B (en) | 2011-11-25 | 2011-11-25 | Method for smelting high strength plastic product steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102443669B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758133A (en) * | 2012-07-26 | 2012-10-31 | 宝山钢铁股份有限公司 | 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof |
| CN102828109A (en) * | 2012-09-17 | 2012-12-19 | 辽宁科技大学 | Metastable-state phase-change plastification ultra-fine grain high-intensity plastic product steel and production method thereof |
| CN103525977A (en) * | 2013-10-10 | 2014-01-22 | 山西太钢不锈钢股份有限公司 | Dehydrogenation method |
| CN106811570A (en) * | 2015-12-02 | 2017-06-09 | 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 |
| CN112662833A (en) * | 2020-11-18 | 2021-04-16 | 邯郸钢铁集团有限责任公司 | Smelting method of low-cost high-carbon chromium bearing steel |
| CN115341130A (en) * | 2022-09-06 | 2022-11-15 | 广西科技大学 | Method for preparing high-strength-ductility hot-rolled cold-formed automobile structural steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566389A (en) * | 2003-06-24 | 2005-01-19 | 宝山钢铁股份有限公司 | Low-carbon low-alloyed dual-phase steel plate with ultra-fine grain structure and method for producing same |
| 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 |
-
2011
- 2011-11-25 CN CN 201110388232 patent/CN102443669B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566389A (en) * | 2003-06-24 | 2005-01-19 | 宝山钢铁股份有限公司 | Low-carbon low-alloyed dual-phase steel plate with ultra-fine grain structure and method for producing same |
| 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 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758133A (en) * | 2012-07-26 | 2012-10-31 | 宝山钢铁股份有限公司 | 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof |
| CN102828109A (en) * | 2012-09-17 | 2012-12-19 | 辽宁科技大学 | Metastable-state phase-change plastification ultra-fine grain high-intensity plastic product steel and production method thereof |
| CN103525977A (en) * | 2013-10-10 | 2014-01-22 | 山西太钢不锈钢股份有限公司 | Dehydrogenation method |
| CN103525977B (en) * | 2013-10-10 | 2016-02-10 | 山西太钢不锈钢股份有限公司 | A kind of method of dehydrogenation |
| CN106811570A (en) * | 2015-12-02 | 2017-06-09 | 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 |
| CN112662833A (en) * | 2020-11-18 | 2021-04-16 | 邯郸钢铁集团有限责任公司 | Smelting method of low-cost high-carbon chromium bearing steel |
| CN115341130A (en) * | 2022-09-06 | 2022-11-15 | 广西科技大学 | Method for preparing high-strength-ductility hot-rolled cold-formed automobile structural steel |
| CN115341130B (en) * | 2022-09-06 | 2023-08-11 | 广西科技大学 | Method for preparing high-strength plastic product hot-rolled cold-formed automobile structural steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102443669B (en) | 2013-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102443669B (en) | Method for smelting high strength plastic product steel | |
| CN103397249B (en) | Hypoxemia low-carbon electrical steel and production method thereof | |
| CN101121987B (en) | Smelting method for titanium-containing austenitic stainless steel | |
| CN111020393B (en) | Preparation method of nitrogen-rich vanadium microalloyed HRB600 ultrafine grain anti-seismic steel bar | |
| CN103014537B (en) | Smelting method of steel used in high speed passenger train hollow axle | |
| CN102978505B (en) | Smelting method of high-strength IF steel | |
| CN105039648B (en) | Method for smelting low-carbon and high-manganese-content molten steel through argon oxygen decarburizing furnace | |
| CN105018669B (en) | A kind of production method of nuclear power ingot iron | |
| CN110093479B (en) | Bottom blowing CO2Method for smelting stainless steel | |
| CN105543675A (en) | Cold heading steel with refined crystalline grains and production process thereof | |
| CN104988424B (en) | Method for smelting non-oriented silicon steel by using molten iron containing vanadium and titanium | |
| CN101509097A (en) | Q460 level low alloy high-strength corner iron and production process | |
| CN111647708B (en) | Long-life synchronous combined blowing dephosphorization smelting method for high-phosphorus molten iron | |
| CN102312035A (en) | Smelting method for producing high strength weathering steel by use of chromium-nickel pig iron | |
| CN107893188A (en) | A kind of smelting process of high intensity manganese-boron steel | |
| CN103642971A (en) | Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method | |
| CN102978332A (en) | Smelting method of 9Ni steel | |
| CN110373605B (en) | High-toughness alloy steel and smelting method thereof | |
| CN108330240A (en) | Method of the aluminium without calcification processing drops in continuous casting Q235 steel grades | |
| CN114350879A (en) | Smelting method of low-carbon ultralow-sulfur pure iron | |
| CN103642966A (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN103667952A (en) | Production process of weather-resistant steel | |
| CN111304404B (en) | Cored wire for oxide metallurgy of vacuum induction furnace and use method | |
| CN108796173A (en) | Improve the smelting process of heavy rail steel cleanness | |
| CN103540712B (en) | Nitrogen increasing method of low-carbon high-nitrogen stainless steel ladle |
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 |