CN102248142A - Method for producing medium and low carbon aluminum killed steel - Google Patents
Method for producing medium and low carbon aluminum killed steel Download PDFInfo
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- CN102248142A CN102248142A CN2011101811202A CN201110181120A CN102248142A CN 102248142 A CN102248142 A CN 102248142A CN 2011101811202 A CN2011101811202 A CN 2011101811202A CN 201110181120 A CN201110181120 A CN 201110181120A CN 102248142 A CN102248142 A CN 102248142A
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Abstract
The invention provides a method for producing medium and low carbon aluminum killed steel, which comprises the following steps of: controlling the content of sulfur in molten iron to be not more than 0.015 percent; primarily smelting the molten iron to form molten steel, and tapping; adding an aluminum deoxidizer into the molten steel when 20 to 30 weight percent of molten steel is tapped; adding 4.0 to 6.0kg of active lime and fluorite in an amount which is 0.2 times that of the active lime into each ton of molten steel when 31 to 50 weight percent of molten steel is tapped; performing argon blowing refining for the first time; adding aluminum in two or three batches and 1.5 to 4kg of refining slag into each ton of steel in a steel ladle, heating, and refining; performing calcium treatment on the molten steel; performing argon blowing refining for the second time; and performing continuous casting. By the method, the castability of the molten steel can be improved, the phenomenon of water nozzle clogging is avoided, and the continuous casting heats of a single tundish in the continuous casting process of the medium and low carbon aluminum killed steel are not less than 8 heats.
Description
Technical field
The present invention relates to Ferrous Metallurgy and continuous casting technology field, more particularly, relate to the method for numbers of continuous casting heats of low carbon in a kind of can the raising.
Background technology
In the prior art, low-carbon (LC) contains aluminum steel (that is, middle carbon aluminium-killed steel in) the technical process, because the dystectic aluminium oxide (Al in the molten steel in adopting the continuous casting process cast
2O
3) be field trash and calcium silicates (CaSiO
3) wait field trash to stick to easily on the crystallizer submersed nozzle inwall, it is stopped up, so cause the company of a tundish list bag to water stove number lower (for example, less than 6 stoves), production cost increases, organization of production is subjected to very big influence.And generally, sour molten aluminium ([Al]) content is high more in the steel, and the probability that obstruction takes place is high more, stops up also serious more.In addition, less (for example, section is not more than 40000mm to casting section
2) continuous casting billet the time because crystallizer submersed nozzle internal diameter is less, stop up even more serious.In order to overcome the problems referred to above, modes such as available technology adopting calcium processing are to dystectic Al
2O
3Be that field trash carries out degenerative treatments, make it change low-melting Al into
2O
3Be field trash, thereby reach the purpose of improving watering property of molten steel, but the method has increased production cost.
Summary of the invention
The invention provides a kind of production method of middle carbon aluminium-killed steel, described method can be improved the aluminium weight percentage and be not less than 0.01% watering property of middle low carbon steel molten steel.More particularly, described method is particularly suitable for (for example, the strand cross sectional area≤40000mm of light section in employing
2) billet continuous casting technology casts sour molten aluminium percentage composition when being not less than 0.01% middle low carbon steel, improves watering property of molten steel.
The invention provides a kind of production method of middle carbon aluminium-killed steel, said method comprising the steps of: the sulfur content in the molten iron is controlled to be is not more than 0.015%; Molten iron is carried out refining just forming molten steel, molten steel is tapped in the ladle; In 20%～30% the process of tapping by weight percentage, add the aluminium deoxidier in molten steel, the addition of aluminium deoxidier is for making that acid-soluble aluminum content is high by 0.02%～0.04% in the molten steel that requires before the acid-soluble aluminum content in the molten steel is by weight percentage than continuous casting after finishing ar blowing refining for the first time; In 31%～50% the process of tapping by weight percentage, in molten steel, add the active lime of 4.0～6.0Kg/ ton steel and addition and be 20% fluorite of active lime weight; Ar blowing refining for the first time; The refining slag that adds aluminium and 1.5～4kg/ ton steel to ladle top of the slag place, heating then, carry out ladle refining, described aluminium divides 2～3 batches of addings, wherein first follows closely behind refining slag and adds, and the addition of this first aluminium is 10%～20% of a refining slag addition, the expectation recovery rate of the addition sum of all the other batches=(acid-soluble aluminum content in this first aluminium molten steel after refining of molten steel acid-soluble aluminum content-adding that requires before the continuous casting) * molten steel amount/aluminium, wherein, the expectation recovery rate of described all the other batches aluminium is calculated according to 65%～85%, is preferably 75%～80%; Xiang Gangzhong adds calcium containing alloy molten steel is carried out the calcium processing, the addition of calcium containing alloy=[mass fraction of calcium in (the molten aluminium mass fraction of 0.2～0.4+ molten steel acid * 1000) * 0.29/ calcium containing alloy] kg/ ton molten steel; Ar blowing refining for the second time; Adopt continuous casting process to cast.
In one embodiment of the invention, described first time, the step of ar blowing refining also can comprise an amount of aluminium of feeding in molten steel, so that acid-soluble aluminum content is high by 0.02%～0.04% in the molten steel that the acid-soluble aluminum content in the molten steel requires before by weight percentage than continuous casting after finishing ar blowing refining for the first time.
In one embodiment of the invention, in described ladle refining step, the fluorite that the refining slag of described 1.5～4kg/ ton steel can be active lime weight 20% with the active lime and the weight of 1.5～4kg/ ton steel replaces.
In one embodiment of the invention, described aluminium deoxidier can be in metallic aluminium, alfer, aluminium barium alloy, alusil alloy and the alumal one or more.
In one embodiment of the invention, described first time, the Argon intensity of ar blowing refining step can be 0.8～1.5NL/ (ton steel minute), and the argon blowing time of ar blowing refining can be 5～15 minutes for the first time.
In one embodiment of the invention, described second time, the Argon intensity of ar blowing refining step can be 0.8～1.5NL/ (ton steel minute), and the argon blowing time of ar blowing refining can be 5～15 minutes for the second time.
In one embodiment of the invention, described calcium containing alloy can be in calcium-silicon, the Ca-Fe alloy one or more.
In one embodiment of the invention, the cross sectional area of the strand of described method casting formation can be not more than 40000mm
2
Compared with prior art, the present invention is by adopting suitable deoxidization technique and crossing methods such as program control aluminum dipping form formula, refining slag making, removal field trash, molten steel diffusive deoxidation, deformation processing of inclusion, make that watering property of molten steel is effectively improved, the nozzle blocking phenomenon is alleviated, and the tundish list continuous cast crystallizer number in the carbon aluminium-killed steel casting process is not less than 8 stoves in making, has reached the purpose of economical production.In addition, method of the present invention is particularly suitable for solving the strand cross sectional area and is not more than 40000mm
2The continuous casting process process in the nozzle blocking problem.
The specific embodiment
Analyze by reason and blocking mechanism, can draw the main cause that causes nozzle blocking and comprise all many-sides such as steel quality, liquid steel temperature, mouth of a river material and structure, mouth of a river heat transfer and secondary oxidation nozzle blocking.Experiment show aluminum oxide on the wall of the mouth of a river to adhere to the chemical reaction that takes place between sintering and molten steel and the mouth of a river refractory material be the major reason that causes nozzle blocking.
According to experiment and analysis, can learn in the steel there be the main source of aluminum oxide:
(1) field trash that suspends in the molten steel (for example, is mainly deoxidation products α-Al
2O
3Particle) effect by interfacial tension sticks on the wall of the mouth of a river;
(2) 3SiO takes place in mouth of a river material and molten steel
2(S)+3C (S)+4Al=2Al
2O
3(S)+Al that 3Si+3C (L) reaction generates
2O
3
(3) O that adsorbs in the mouth of a river refractory material space
2React the Al that generates with the Al in the molten steel
2O
3
(4) airborne O
2React the Al that generates with the Al in the molten steel
2O
3(that is Al that formed by secondary oxidation of the aluminium in the molten steel,
2O
3);
(5) Al that descends and separate out with mouth of a river inwall liquid steel temperature
2O
3
According to the sample of gathering in the process for making process is researched and analysed, can draw, along with the increase of CaO content in the field trash, Al
2O
3The order that transformation takes place field trash is as follows:
Al
2O
3→CaO·6Al
2O
3→CaO·2Al
2O
3→CaO·Al
2O
3→12CaO·7Al
2O
3→3CaO·Al
2O
3→CaO。
Table 1 shows the physical characteristic of various non-metallic inclusions.Al
2O
3The density and the fusion temperature that are field trash see Table 1.As can be seen from Table 1,12CaO7Al
2O
3Fusion temperature be 1455 ℃, so it is liquid in the pouring molten steel process, 3CaOAl
2O
3Also operative liquid can appear, and Al
2O
3, CaO6Al
2O
3, CaO2Al
2O
3, CaOAl
2O
3Fusing point all higher, in the continuous casting steel casting cycle, can separate out earlier, and adhere to the inwall and the end opening end face of stopper and submersed nozzle upper gap and submersed nozzle, thereby cause mouth of a river unsteady flow to stop up.
The various non-metallic inclusion physical characteristics of table 1
Therefore, water the stove number to improve to connect, need Al in the control molten steel in order to improve the watering property of molten steel that contains aluminum steel
2O
3It is the value volume and range of product of high-melting-point field trash.
In addition, except dystectic Al
2O
3Be that field trash can cause outside the mold gap obstruction, field trashes such as calcium silicates also can cause mold gap to block.
The present invention is based on continuous cast mold nozzle blocking reason and mechanism is carried out drawing on the basis of above-mentioned analysis.In this application, do not having under the situation about specifying, percentage all is weight percentage.
Production method according to carbon aluminium-killed steel in of the present invention can may further comprise the steps: the sulfur content in the molten iron is controlled to be is not more than 0.015%; Molten iron is carried out refining just forming molten steel, molten steel is tapped in the ladle; In 20%～30% the process of tapping by weight percentage, add the aluminium deoxidier in molten steel, the addition of aluminium deoxidier is for making the acid-soluble aluminum content in the molten steel that requires before the acid-soluble aluminum content in the molten steel is by weight percentage than continuous casting after finishing the ar blowing refining first time high by 0.02%～0.04%; In 31%～50% the process of tapping by weight percentage, in molten steel, add the active lime of 4.0～6.0Kg/ ton steel and addition and be 20% fluorite of active lime; Ar blowing refining for the first time; The refining slag from 1.5～4kg/ ton steel to ladle top of the slag place and the aluminium that add, heating then, carry out ladle refining, here, described aluminium divides 2～3 batches of addings, wherein first follows closely behind refining slag and adds, and first addition is 10%～20% of a refining slag addition, the expectation recovery rate of the addition sum of all the other batches=(acid-soluble aluminum content in this first aluminium molten steel after refining of molten steel acid-soluble aluminum content-adding that requires before the continuous casting) * molten steel amount/aluminium, wherein, the expectation recovery rate of described all the other batches aluminium is calculated according to 65%～85%, is preferably 75%～80%; Xiang Gangzhong adds calcium containing alloy molten steel is carried out the calcium processing, the addition of calcium containing alloy=[mass fraction of calcium in (the molten aluminium mass fraction of 0.2～0.4+ molten steel acid * 1000) * 0.29/ calcium containing alloy] kg/ ton molten steel; Ar blowing refining for the second time; Adopt continuous casting process to cast.In the present invention, carbon aluminium-killed steel contains and is not less than 0.01% aluminium by weight percentage in described.In the present invention,, then be easy to generate high-melting-point CaS in the molten steel, stop up the mouth of a river, even when the calcium alloy addition is too many, the flush water lip reflex can occur, thereby cause the mouth of a river easily to bore a hole and increased production cost if calcium alloy adds too much; If it is very few that calcium alloy adds, then can not reach the effect of field trash modification.
In one embodiment of the invention, described first time, the step of ar blowing refining also can comprise an amount of aluminum steel of feeding in molten steel, finishing the back and in the step of the ar blowing refining first time, in steel, add an amount of aluminum steel, thereby make that acid-soluble aluminum content is high by 0.02%～0.04% in the molten steel that requires before the acid-soluble aluminum content in the molten steel is by weight percentage than continuous casting after finishing the ar blowing refining first time by in tapping 20%～30% process, in steel, adding aluminum series alloy and tapping.When the addition of aluminium be lower than above-mentioned requirements following in limited time, molten steel can not reach predetermined deoxidation requirement, influences the degree of purity of molten steel; When the addition of aluminium is higher than going up in limited time of above-mentioned requirements, thereby the aluminium too high levels in the molten steel can cause watering property of molten steel deterioration.In the present invention, described aluminum steel can be the aluminium solid wire of 0.2～0.25kg/m.
In one embodiment of the invention, ar blowing refining and the refining between the ar blowing refining for the second time can be ladle furnace refining (that is LF refining) or vacuum circulation degassing refining (RH refining) in the first time.In an embodiment of the present invention, described refining slag can be various types of refining slags, and for example, refining slag can be by 70～80 parts CaO, 2～8 parts Al by weight
2O
3, 0～5 part MgO, 0～3 part SiO
2, 0～5 part Na
2CO
3, 8～14 parts CaF
2Form.When the addition of refining slag during less than 1.5kg/ ton steel, can not reach the effect of adsorbing steel inclusion and desulfurization preferably, its addition can cause occurring in the molten steel point-like inclusion of CaO particle during greater than 4kg/ ton steel, and this type impurity is not easy to remove from steel.In described refinement step, the refining slag of described 1.5～4kg/ ton steel can replace with the active lime of 1.5～4kg/ ton steel and for the fluorite of active lime weight 20%.The addition of active lime is during less than 1.5kg/ ton steel, can not reach the effect of adsorbing steel inclusion and desulfurization preferably, the addition of active lime can cause occurring in the molten steel point-like inclusion of CaO particle during greater than 4.0kg/ ton steel, and this type impurity is not easy to remove from steel.Fluorite adds few, and the flowability of ladle slag is poor, is unfavorable for the refining slag, has added refractory brick in the ladle is corroded seriously.
In the present invention, described active lime can contain 85.0≤CaO≤95.0%, 5% 〉=MgO＞0,2.5% 〉=SiO by mass percentage
2＞0, all the other are trace impurities such as P, S.The composition of described fluorite can contain CaF by mass percentage
2: 80～90%, SiO
2: 0～15%, surplus is an impurity.
In one embodiment of the invention, described aluminium deoxidier can or be usually used in other aluminium-containing alloy of deoxidation for aluminium, alfer, aluminium barium alloy, alusil alloy, alumal.Those skilled in the art can select appropriate aluminium deoxidier to the requirement of deoxidation according to molten steel.For example, the aluminium deoxidier can be alfer, and described alfer is made up of 38～46 parts Al and 54～62 parts Fe by weight.
In one embodiment of the invention, described first time, the Argon intensity of ar blowing refining step can be 0.8～1.5NL/ (ton steel minute), and the argon blowing time of ar blowing refining can be 5～15 minutes for the first time.In one embodiment of the invention, described second time, the Argon intensity of ar blowing refining step can be 0.8～1.5NL/ (ton steel minute), and the argon blowing time of ar blowing refining can be 5～15 minutes for the second time.Here, the Argon amount is too little, and is unfavorable to inclusion floating in the molten steel, and the Argon amount is excessive, causes molten steel oxidized easily.Argon blowing time is not enough, and the clearance of deoxidation products is less in the molten steel, and argon blowing time is oversize, causes the liquid steel temperature loss serious easily.
The method according to this invention is carried out calcium to molten steel and is handled dystectic Al that can make in the molten steel
2O
3Be that inclusion modification is low-melting Al
2O
3Be field trash, and can make sulfide that sex change also takes place.In one embodiment of the invention, described calcium containing alloy can or be usually used in other calcium containing alloy that calcium is handled for calcium-silicon, Ca-Fe alloy.Those skilled in the art can select the kind of calcium containing alloy according to the requirement that molten steel is handled calcium, be preferably silicon-calcium wire, described silicon-calcium wire contains 55～75 parts Si and 25～45 parts Ca by weight, its diameter is 10～13mm, and the addition of described silicon-calcium wire=[mass fraction of calcium in (the molten aluminium mass fraction of 0.2～0.4+ molten steel acid * 1000) * 0.29/ silicon-calcium wire] Kg/ ton molten steel.For example, the silicon-calcium wire that uses in the embodiments of the invention 1 to 4 can contain 27%～30% Ca, 57%～60% Si and the steel shell of surplus by weight percentage.
In one embodiment of the invention, the cross sectional area of the strand of method casting formation of the present invention is not more than 40000mm
2The cross sectional area of the strand that forms when casting is not more than 40000mm
2The time, method of the present invention can be increased to middle continuous cast crystallizer number and be not less than 8 stoves.
Specifically, method of the present invention can adopt following processing step to implement:
(1) molten iron preliminary treatment
By modes such as molten iron preliminary treatment the sulfur content in the molten iron is controlled at≤0.015%.
(2) converter is just refined
In converter molten iron is carried out refining just, the molten steel after will just refining is then tapped in the ladle.Just the mass percent of the composition of steel-making water may be controlled to: C:0.05～0.08%, and Mn:0.03～0.04%, Cr:0.030～0.04%, P:0.004～0.010%, S:0.08～0.015%, surplus is the unavoidable impurities of iron and trace.Yet, the invention is not restricted to this, that is, just the molten steel composition of refining also can be formed for other.To 20～30% processes, in molten steel, add the aluminium deoxidier in tapping.Here, except only in steel, adding the deoxidier, can also add deoxidier, alloy and carburant simultaneously to the requirement of molten steel component and/or in order to optimize process conditions according to steel grade.Here, adding carburant can regulate the carbon content in the molten steel to a certain extent and optimize the subsequent technique process to a certain extent.Here, the purpose of adding alloy is for molten steel component being adjusted to the scope that steel grade requires.For a person skilled in the art, at different steel grades, the amount that adds alloy can be different with kind.In addition, also can in the ladle refining process, add the needed alloy of steel grades and regulate alloying component in the molten steel.After adding deoxidier and alloy, to 31～50% processes, in ladle, add the active lime of 4.0～6.0Kg/ ton steel in tapping, and add fluorite, and fluorite addition=described active lime weight * 20%.
(3) tapping back Argon
Carry out ar blowing refining at the Argon station after having gone out steel.Also can when ar blowing refining, in molten steel, feed aluminum steel.The addition of described aluminium is interpreted as the acid-soluble aluminum content in the molten steel is controlled to be molten steel acid-soluble aluminum content+(0.02%～0.04%, be preferably 0.03%) that requires before the continuous casting.
(4) LF stove ladle refining
Add the refining slag and the aluminium of 1.5～4kg/ ton steel at LF stove ladle refining heating beginning forward direction ladle top of the slag place, also can adopt equivalent amount of active lime, and with addition of fluorite, fluorite addition=described active lime weight * 20%.Described aluminium divides 2～3 batches of addings, wherein first follows closely behind refining slag and adds, and addition is 10%～20% of a refining slag addition, the expectation recovery rate of the addition sum of all the other batches=(acid-soluble aluminum content in this first aluminium molten steel after refining of molten steel acid-soluble aluminum content-adding that requires before the continuous casting) * molten steel amount/aluminium.Specifically, if divide 2 batches of addings with aluminium, then second batch addition equals the difference * molten steel amount/expectation recovery rate of the molten steel acid-soluble aluminum content and the acid-soluble aluminum content in the current molten steel (that is, adding first aluminium refining molten steel afterwards) of continuous casting requirement before; If divide 3 batches of addings with aluminium, then the addition sum of second batch and the 3rd batch equals the molten steel acid-soluble aluminum content that requires before the continuous casting and current molten steel (promptly, add the molten steel after first aluminium refining) in the difference * molten steel amount/expectation recovery rate of acid-soluble aluminum content, aluminium is added ladle in batches molten steel is carried out refining, can significantly reduce the oxidation of aluminium, thereby improved the utilization rate of aluminium, and improved desulfurization, deoxidation effect.Wherein, the expectation recovery rate of described all the other batches aluminium is calculated according to 65%～85%, is preferably 75%～80%.Here, by to the estimation of the expectation recovery rate of aluminium and will be worth in the calculating of introducing the aluminium addition, make method of the present invention can control the content of aluminium in the molten steel more accurately.
(5) calcium is handled
Xiang Gangzhong adds calcium containing alloy molten steel is carried out the calcium processing, so that the dystectic Al in the molten steel
2O
3Be that inclusion modification is low-melting Al
2O
3Be field trash, and make sulfide that sex change also take place.
(6) Argon before the casting
Molten steel being sent to before continuous casting working procedure pours into a mould, in order to accelerate inclusion floating to liquid steel level, molten steel to be carried out Argon handle, Argon intensity is 0.8～1.5NL/ (ton steel minute), argon blowing time is 5～15 minutes.
(7) continuous casting
Adopt well-known protection casting mode that molten steel is protected during continuous casting, comprise cover protection tube in the mouth of a river under the ladle, Argon between the mouth of a river and protection tube under the ladle, molten steel well covers in the tundish, adopts the crystallizer submersed nozzle, uses crystallizer protecting residue.Preferably, also under ladle, use the seal washer sealing between the mouth of a river and the protection tube.
Since above-mentioned method of refining of the present invention controlled that the meeting in the molten steel causes that mold gap stops up such as Al
2O
3Be the value volume and range of product of field trashes such as high-melting-point field trash and calcium silicates, and can make Al
2O
3Be that the high-melting-point field trash changes low-melting Al into
2O
3Be field trash, thereby reach the purpose of improving watering property of molten steel that make its crystallizer submersed nozzle inwall be difficult for stopping up, the stove number waters in the company of having improved tundish list bag, greatly reduces production cost.Realize of the present invention a kind of process route although described here, the invention is not restricted to this.For example, the technological process that it should be appreciated by those skilled in the art that the technological process that also can adopt the first refining of electric furnace, Argon, LF stove ladle refining, RH vacuum refining or the first refining of converter, Argon, RH vacuum refining realizes method of the present invention.And, those skilled in the art should understand that, according to different production models, can carry out appropriate design to the various process routes of realizing the inventive method, thereby realize linking between each step easily by controlling parameter in each step, and can be connected with follow-up for example continuous casting working procedure.For example, can make the state of molten steel behind the state of first steel-making water and the LF stove ladle refining be suitable for the processing of next step.By implementing method of the present invention, watering property of molten steel be improved significantly, middle continuous cast crystallizer number is brought up to 〉=8 stoves, has significantly reduced production cost.
Hereinafter, will describe the present invention in detail in conjunction with exemplary embodiment.
Embodiment 1
Adopt the technological process of 120t converter, tapping back Argon, LF stove ladle refining, 200mm * 200mm billet continuous casting to smelt the 20CrMnTi pinion steel, it is 0.01%～0.04% that this steel grade finished product requires [Al], finished product [C] content 0.17%～0.23% adopts aluminium as deoxidier molten steel to be carried out deoxidation.
The molten steel sulfur content that is blended into converter is 0.015%, and converter smelting endpoint [C] content is 0.08%.To about 30% o'clock, the aluminium that adds 3.5kg/ ton molten steel carried out deoxidation to molten steel in tapping, and ferrosilicon, the ferromanganese of 16.5kg/ ton molten steel and the low-carbon ferrochromium of 14kg/t steel of adding 2.0kg/ ton molten steel carry out the molten steel alloying to molten steel.About 50% o'clock of tapping, in ladle, add the active lime of 4kg/ ton molten steel, the fluorite of 0.8kg/ ton molten steel.After having tapped, molten steel in the ladle is carried out low discharge Argon 10min, deoxidation products is fully floated, improve the molten steel degree of purity.Thereby obtain the molten steel of deoxidation and alloying, the gained molten steel composition is by mass percentage: C:0.13%, Mn:0.86%, P:0.008%, S:0.012%, Si:0.12%, Cr:1.11%, Ti:0.001%, [Al]: 0.065%, Fe:97.45%, surplus is an impurity.Described ferrosilicon composition is by mass percentage: Si:74.5%, and Al:18%, Ca:0.5%, Mn:0.3%, Cr:0.2%, P:0.01%, S:0.01%, C:0.08%, surplus is Fe; Described ferromanganese composition is by mass percentage: Mn:74.5%, and C:1.5%, Si:1.5%, P:0.01%, S:0.01%, surplus is Fe; Described low-carbon ferrochromium alloying component is: Si:3%, and C:0.3%, Cr:59.5%, Fe:18%, surplus is an impurity.
LF further controls ladle slag and forms, and improves the ability of its dross inclusion adsorption.In ladle, add the active lime of 1.5kg/ ton molten steel and the fluorite of 0.3kg/ ton molten steel when standing by enter LF at molten steel, simultaneously aluminium is added ladle in two batches, the addition of first aluminium be 0.36kg/ ton molten steel (promptly, the addition sum of active lime and fluorite 20%), because diffusive deoxidation, sour molten aluminium scaling loss is more in the molten steel, and after first sour molten aluminium added, the acid-soluble aluminum content of molten steel was 0.02%.Heat and added second batch of aluminium in 10 minutes afterwards, the addition of second batch of aluminium is that the molten steel acid-soluble aluminum content that continuous casting process requires deducts difference * molten steel amount that the acid-soluble aluminum content in the current molten steel obtains, it is 0.03%～0.05% that this steel continuous casting requires acid-soluble aluminum content, by middle limit value, i.e. (0.04%-0.02%) * 130000=26kg, and the recovery rate of aluminium is calculated by 80%, and promptly adding aluminium is 32.5kg in this molten steel.By adding aluminium and as the active lime and the fluorite of refining slag, to control ladle slag and form and reduce its oxidisability, the reproducibility refining slag of generation contacts with molten steel, and the dissolved oxygen in the molten steel is diffused in the slag, reaches the purpose of diffusive deoxidation.After LF strengthened diffusive deoxidation, the acid-soluble aluminum content in the molten steel was 0.045%, and S content is 0.007%.
Carry out calcium after LF handles and handle, the silicon-calcium wire of molten steel feeding 0.7kg/ ton molten steel in ladle, calcium is handled the back molten steel in the ladle is carried out low discharge blowing argon gas 15min, and wherein Argon intensity is 0.8NL/ (ton molten steel minute).The silicon-calcium wire that uses in the present embodiment contains 27% Ca, 60% Si and the steel shell of surplus by weight percentage.
Molten steel is sent to continuous casting waters steel, continuous casting adopts the protection cast, and this watering property of molten steel is good, and middle continuous cast crystallizer number is 9 stoves.
Embodiment 2
Present embodiment is substantially the same manner as Example 1, and difference is, the steel of present embodiment also carries out vacuum circulation degassing refining treatment (that is, the RH application of vacuum) to molten steel after second time ar blowing refining, specific as follows:
Molten steel is carried out the RH application of vacuum, and processing procedure lift gas flow is 1400NL/ minute, and vacuum is 12 minutes less than the processing time of 3mbar; Handle after 12 minutes, keep vacuum, add alloy and carburant and carry out alloying and carburetting.Wherein: carburant 0.5kg/ ton molten steel, ferrotianium 1.6kg/ ton molten steel, ferrosilicon 1.3kg/ ton molten steel, ferromanganese 1.2kg/ ton molten steel, low-carbon ferrochromium 0.6kg/ ton molten steel.After the alloying, circular treatment 5 minutes makes composition even.Vacuum breaker, Argon set off after 8 minutes then, and wherein Argon intensity is 1.0NL/ (ton steel minute), 1585 ℃ of out-station temperatures.The mass percent of the composition of final molten steel is: C:0.20%, and Mn:0.95%, P:0.010%, S:0.006%, Si:0.27%, Cr:1.15%, Ti:0.06%, [Al]: 0.035%, Fe:97.12%, surplus is an impurity.Described low-carbon ferrochromium alloying component is: Si:3%, and C:0.3%, Cr:59.5%, Fe:18%, surplus is an impurity.Described carburant composition is by mass percentage: CaO:0.2%, SiO
2: 3.19%, MgO:0.2%, Fe
2O
3: 0.676%, FeO:0.901%, C:86.02%, S:0.21%, P:0.09%, surplus is an impurity.Molten steel is sent to continuous casting and waters steel, and continuous casting adopts the protection cast, and this watering property of molten steel is good, and middle continuous cast crystallizer number is 10 stoves.
Embodiment 3
Adopt the technological process of 120t converter, tapping back Argon, LF ladle furnace refining, 200mm * 200mm billet continuous casting to smelt the 20CrMnTi pinion steel, it is 0.01%～0.04% that this steel grade finished product requires [Al], finished product [C] content 0.17%～0.23% adopts the ferro-aluminum deoxidation.
The molten steel sulfur content that is blended into converter is 0.012%, converter smelting endpoint [C] content is 0.05%, the ferro-aluminum that added 3.5kg/ ton molten steel in tapping to about 20% o'clock carries out deoxidation to molten steel, and the ferrosilicon of adding 2.0kg/ ton molten steel, 16.5kg/ the ferromanganese of ton molten steel, the carburant of the low-carbon ferrochromium of 14kg/t steel and 0.85kg/ ton molten steel carries out molten steel alloying and carburetting, the active lime that in ladle, added 6kg/ ton molten steel in tapping at about 31% o'clock, 1.2kg/ the fluorite of ton molten steel, back feeding aluminum steel 200m in ladle has tapped, argon gas with 0.8NL/ (ton steel minute) flow carries out Argon 10min to molten steel in the ladle again, deoxidation products is fully floated, improve the molten steel degree of purity.Thereby obtain the molten steel of deoxidation alloying, its composition quality percentage is: C:0.14%, and Mn:0.85%, P:0.009%, S:0.011%, Si:0.13%, Cr:1.12%, Ti:0.001%, [Al]: 0.060%, surplus is Fe and impurity.The mass percent of described ferrosilicon composition is: Si:74.5%, and Al:18%, Ca:0.5%, Mn:0.3%, Cr:0.2%, P:0.01%, S:0.01%, C:0.08%, surplus is Fe; The mass percent of described ferromanganese composition is: Mn:74.5%, and C:1.5%, Si:1.5%, P:0.01%, S:0.01%, surplus is Fe; The mass percent of described carburant composition is: CaO:0.2%, SiO
2: 3.19%, MgO:0.2%, Fe
2O
3: 0.676%, FeO:0.901%, C:86.02%, S:0.21%, P:0.09%, surplus is an impurity.Described low-carbon ferrochromium alloying component is: Si:3%, and C:0.3%, Cr:59.5%, Fe:18%, surplus is an impurity.Described aluminum steel is the solid aluminum steel of 0.25kg/m.
LF further controls ladle slag and forms, and improves the ability of its dross inclusion adsorption.In ladle, add the active lime of 4kg/ ton molten steel, the fluorite of 0.8kg/ ton molten steel when standing by enter LF at molten steel, simultaneously aluminium is added ladle in three batches, the addition 0.48kg/ ton molten steel of first aluminium (promptly, the addition sum of active lime and fluorite 10%), add second batch of aluminium after 8 minutes, the addition of second batch of aluminium is a 0.10kg/ ton molten steel, because diffusive deoxidation, sour molten aluminium scaling loss is more in the molten steel, and after the second batch of molten aluminium of acid added, the acid-soluble aluminum content of molten steel was 0.03%.Add the 3rd batch of aluminium after 5 minutes, the addition of the 3rd batch of aluminium is the expectation recovery rate that molten steel acid-soluble aluminum content that continuous casting process requires deducts difference * molten steel amount/aluminium that the acid-soluble aluminum content in the current molten steel obtains, it is 0.03%～0.05% that this steel continuous casting requires acid-soluble aluminum content, by middle limit value, i.e. (0.04%-0.03%) * 130000=13kg, and the expectation recovery rate of aluminium is calculated by 70%, and promptly adding aluminium is 18.6kg in this molten steel.By adding aluminium and as the active lime and the fluorite of refining slag, the control ladle slag is formed and reduced its oxidisability, the reproducibility refining slag of generation contacts with molten steel, and the dissolved oxygen in the molten steel is diffused in the slag, reaches the purpose of diffusive deoxidation.After LF strengthened diffusive deoxidation, the acid-soluble aluminum content in the molten steel was 0.035%, and S content is 0.008%.
Carry out calcium after LF handles and handle, the silicon-calcium wire of molten steel feeding 0.65kg/ ton molten steel in ladle, calcium are handled the back and with the argon gas of 1.5NL/ (ton steel minute) flow molten steel in the ladle are carried out Argon 5min.The silicon-calcium wire that uses in the present embodiment contains 30% Ca, 57% Si and the steel shell of surplus by weight percentage.The mass percent of the composition of final molten steel is: C:0.19%, and Mn:0.98%, P:0.009%, S:0.007%, Si:0.26%, Cr:1.18%, Ti:0.05%, [Al]: 0.025%, the impurity of Fe:97.12% and surplus.Described low-carbon ferrochromium alloying component is: Si:3%, and C:0.3%, Cr:59.5%, Fe:18%, surplus is an impurity.
Molten steel is sent to continuous casting and waters steel, and continuous casting adopts the protection cast, and this watering property of molten steel is good, and middle continuous cast crystallizer number is 10 stoves.
Embodiment 4
Adopt the technological process of 120t electric furnace, tapping back Argon, LF ladle furnace refining, Φ 200mm billet continuous casting to smelt the X52 pipe line steel, it is 0.01%～0.05% that this steel grade finished product requires [Al], and finished product [C] content 0.14%～0.18% adopts the ferro-aluminum deoxidation.
The molten steel sulfur content that is blended into converter is 0.010%, and converter smelting endpoint [C] content is 0.06%.To about 25% o'clock, the ferro-aluminum that adds 3.5kg/ ton molten steel carried out deoxidation to molten steel in tapping, and ferrosilicon, the ferromanganese of 19kg/ ton molten steel and the carburant of 0.6kg/ ton molten steel of adding 2.0kg/ ton molten steel carry out molten steel alloying and carburetting.About 45% o'clock of tapping, add the active lime of 4.5kg/ ton molten steel, the fluorite of 0.9kg/ ton molten steel in ladle, the back feeding aluminum steel 300m in ladle that tapped carries out low discharge Argon 10min to molten steel in the ladle again, deoxidation products is fully floated, improve the molten steel degree of purity.Thereby obtain the molten steel of deoxidation alloying, its composition quality percentage is: C:0.11%, and Mn:1.30%, P:0.009%, S:0.009%, Si:0.13%, [Al]: 0.075%, the impurity of Fe:98% and surplus.The mass percent of described ferrosilicon composition is: Si:74.5%, and Al:18%, Ca:0.5%, Mn:0.3%, Cr:0.2%, P:0.01%, S:0.01%, C:0.08%, surplus is Fe; The mass percent of described ferromanganese composition is: Mn:74.5%, and C:1.5%, Si:1.5%, P:0.01%, S:0.01%, surplus is Fe; The mass percent of described carburant composition is: CaO:0.2%, SiO
2: 3.19%, MgO:0.2%, Fe
2O
3: 0.676%, FeO:0.901%, C:86.02%, S:0.21%, P:0.09%, surplus is an impurity.
LF further controls ladle slag and forms, and improves the ability of its dross inclusion adsorption.In ladle, add the active lime of 3kg/ ton molten steel, the fluorite of 0.6kg/ ton molten steel when standing by enter LF at molten steel, simultaneously aluminium is divided two batches to add ladle, the addition 0.54kg/ ton molten steel of first aluminium (promptly, the addition sum of active lime and fluorite 15%), because diffusive deoxidation, sour molten aluminium scaling loss is more in the molten steel, and after first sour molten aluminium added, the acid-soluble aluminum content of molten steel was 0.03%.Add second batch of aluminium after 10 minutes, the addition of second batch of aluminium is the expectation recovery rate that molten steel acid-soluble aluminum content that continuous casting process requires deducts difference * molten steel amount/aluminium that the acid-soluble aluminum content in the current molten steel obtains, it is 0.03%～0.05% that this steel continuous casting requires acid-soluble aluminum content, by upper limit value, i.e. (0.04%-0.03%) * 130000=13kg, and the expectation recovery rate of aluminium is calculated by 75%, and promptly adding aluminium is 17.3kg in this molten steel.By adding aluminium and as the active lime and the fluorite of refining slag, the control ladle slag is formed and reduced its oxidisability, the reproducibility refining slag of generation contacts with molten steel, and the dissolved oxygen in the molten steel is diffused in the slag, reaches the purpose of diffusive deoxidation.After LF strengthens diffusive deoxidation, add alloy and carry out alloying, carburant 0.5kg/ ton molten steel, ferrosilicon 1.3kg/ ton molten steel, ferromanganese 0.5kg/ ton molten steel.The mass percent of the composition of final molten steel is: C:0.16%, and Mn:1.35%, P:0.010%, S:0.007%, Si:0.27%, [Al]: 0.040%, surplus is Fe and impurity.
Carry out calcium after LF handles and handle, the silicon-calcium wire of molten steel feeding 0.75kg/ ton molten steel in ladle, calcium is handled the back molten steel in the ladle is carried out low discharge blowing argon gas 8min, and wherein Argon intensity is 0.95NL/ ton molten steel minute.Liquid steel temperature is 1575 ℃ after the Argon.The silicon-calcium wire that uses in the present embodiment contains 29% Ca, 59% Si and the steel shell of surplus by weight percentage.
LF departures molten steel is sent to continuous casting and waters steel, and continuous casting adopts the protection cast, and this watering property of molten steel is good, and middle continuous cast crystallizer number is 8 stoves.
In sum, method of the present invention can be by adopting suitable deoxidization technique and crossing the control of methods realizations such as program control aluminum dipping form formula, refining slag making, removal field trash, molten steel diffusive deoxidation, deformation processing of inclusion to the value volume and range of product of high-melting-point field trash in the steel, thereby improved molten steel watering property, alleviated the nozzle blocking phenomenon, tundish list continuous cast crystallizer number in making in the carbon aluminium-killed steel casting process reaches and is not less than 8 stoves, has reached the purpose of economical production.
Although above by having described the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that under the situation of the spirit and scope that do not break away from claim and limited, can carry out various modifications and change to exemplary embodiment of the present invention.
Claims (9)
1. the production method of carbon aluminium-killed steel in a kind is characterized in that, said method comprising the steps of:
Sulfur content in the molten iron is controlled to be is not more than 0.015%;
Molten iron is carried out refining just forming molten steel, molten steel is tapped in the ladle;
In 20%～30% the process of tapping by weight percentage, add the aluminium deoxidier in molten steel, the addition of aluminium deoxidier is for making that acid-soluble aluminum content is high by 0.02%～0.04% in the molten steel that requires before the acid-soluble aluminum content in the molten steel is by weight percentage than continuous casting after finishing ar blowing refining for the first time;
In 31%～50% the process of tapping by weight percentage, in molten steel, add the active lime of 4.0～6.0Kg/ ton steel and addition and be 20% fluorite of active lime weight;
Ar blowing refining for the first time;
Ladle refining, in described ladle refining step, the refining slag that adds aluminium and 1.5～4kg/ ton steel to ladle top of the slag place, heating then, carry out refining, described aluminium divides 2～3 batches of addings, wherein first follows closely behind refining slag and adds, and the addition of this first aluminium is 10%～20% of a refining slag addition, the expectation recovery rate of the addition sum of all the other batches=(acid-soluble aluminum content in this first aluminium molten steel after refining of molten steel acid-soluble aluminum content-adding that requires before the continuous casting) * molten steel amount/aluminium, wherein, the expectation recovery rate of described all the other batches aluminium is calculated according to 65%～85%;
Xiang Gangzhong adds calcium containing alloy molten steel is carried out the calcium processing, the addition of calcium containing alloy=[mass fraction of calcium in (the molten aluminium mass fraction of 0.2～0.4+ molten steel acid * 1000) * 0.29/ calcium containing alloy] kg/ ton molten steel;
Ar blowing refining for the second time;
Adopt continuous casting process to cast, the molten aluminium of molten steel acid is not less than 0.01% during continuous casting.
2. the method for claim 1, it is characterized in that, described first time, the step of ar blowing refining also comprised an amount of aluminium of feeding in molten steel, so that acid-soluble aluminum content is high by 0.02%～0.04% in the molten steel that the acid-soluble aluminum content in the molten steel requires before by weight percentage than continuous casting after finishing ar blowing refining for the first time.
3. the method for claim 1 is characterized in that, in described ladle refining step, the refining slag of described 1.5～4kg/ ton steel replaces with the fluorite that the active lime and the weight of 1.5～4kg/ ton steel is active lime weight 20%.
4. the method for claim 1 is characterized in that, described aluminium deoxidier is one or more in metallic aluminium, alfer, aluminium barium alloy, alusil alloy and the alumal.
5. the method for claim 1 is characterized in that, described first time, the Argon intensity of ar blowing refining step was 0.8～1.5NL/ (ton steel minute), and the argon blowing time of ar blowing refining is 5～15 minutes for the first time.
6. the method for claim 1 is characterized in that, described second time, the Argon intensity of ar blowing refining step was 0.8～1.5NL/ (ton steel minute), and the argon blowing time of ar blowing refining is 5～15 minutes for the second time.
7. the method for claim 1 is characterized in that, described calcium containing alloy is one or more in calcium-silicon and the Ca-Fe alloy.
8. the method for claim 1 is characterized in that, in the step of described ladle refining, the expectation recovery rate of described all the other batches aluminium is calculated according to 75%～80%.
9. as any described method in the claim 1 to 8, it is characterized in that the cross sectional area of the strand that described method casting forms is not more than 40000mm
2
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