CN1053449A - Multipurpose steel refining agent - Google Patents
Multipurpose steel refining agent Download PDFInfo
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- CN1053449A CN1053449A CN 90100786 CN90100786A CN1053449A CN 1053449 A CN1053449 A CN 1053449A CN 90100786 CN90100786 CN 90100786 CN 90100786 A CN90100786 A CN 90100786A CN 1053449 A CN1053449 A CN 1053449A
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Abstract
A kind of multipurpose steel refining agent of recommendation contains the component of following ratio, weight %:
Al 30-40
Si 35-25
Ca 5-15
Mg 7-5
C 20-10
The Fe surplus.
Description
The present invention relates to metallurgy, more specifically to multipurpose steel refining agent.
The present invention can be used for production multi-usage converter steel, siemens martin steel and electric steel.
By carry out the process of addition element from oxidation material reduction alloying element, for example the refining multi-usage contained manganese steel in steel teeming ladle when the present invention can be used for refining steel most effectively.
So-called multipurpose steel, we think that its composition contains the steel of following component ratio, weight %:
C 0.05-0.5
Mn 0.25-2.0
The Fe surplus
In addition, the multipurpose steel composition can contain (weight %):
Si maximum 0.60
Al maximum 0.08
Cr maximum 2.00
V maximum 0.20
Ti maximum 0.20
And other element.
At present, in the practice of in the world metallurgy, in steel teeming ladle, carry out following technological operation: steel alloying, the steel refining desulfurization, rottenly handle and remove non-metallic inclusion, reduce the gas content of oxygen, nitrogen and hydrogen.
Usually carry out sequential operation according to the alloying and the refining of steel.At first make steel alloying by adding various iron alloy, adopt different methods then, for example vacuum is made steel or add various pulverulent materials in inert carrier gas flow and carries out refining.
Each operation of the alloying of steel and purified all causes sizable thermal losses.Therefore for remedy this thermal losses must or in steelmaking equipment that metal is overheated and tap under comparatively high temps, perhaps supplementary heating metal in the steel teeming ladle on isolated plant.
But these two kinds of methods are uneconomic to the production multi-usage steel capital.Because the first, because at high temperature the solubleness of oxygen is big, overheated its degree of oxidation that just causes of metal increases.Therefore increase the consumption of reductor, steel is polluted by deoxidation products-non-metallic inclusion, thereby worsens the quality of steel.
The second, on isolated plant, adopt supplementary heating, except the ancillary cost of building these equipment, also cause the treatment time to increase, thereby reduce the productivity of steelmaking equipment.
All these causes improving the cost of steel, and this is non-remunerative in multipurpose steel production eventually.
Known a kind of liquid metal refining agent (EP, A
1, 0192090), its composition contains the component of following ratio, weight %:
Si 40-80
Ti 10-20
Mg 1.5-3.0
Ca 0-0.5
Al 0-2
Rare earth element 0-2
The Fe surplus
But known refining agent can not guarantee to realize the refining desulfuration of effective steel and remove non-metallic inclusion, because do not reach this essential condition-dissolved oxygen of low levels in liquid metal.
This content with active element-reductor in known refining agent composition is low relevant, and these reductors are aluminium, magnesium, calcium, rare earth, and they itself also are strong sweetening agent and non-metallic inclusion denaturing agent.Because these materials contact with oxygen in being dissolved in liquid metal, they can make the fine deoxidation of metal, and are not enough for desulfurization and denaturing treatment.
In addition, add titanium in known refining agent composition, owing to oxidation forms refractory oxide, it swims on the slag, improves the viscosity of slag, causes reducing the adsorptive power of slag to sulphur and non-metallic inclusion, and they are stayed in the metal.Reduce metal quality thus.
Use known refining agent to be suitable for steel alloying process, use this refining agent to cause to obtain the standardized steel of chemical ingredients by these elements of reduction from the oxide compound that contains alloying element.Add silicon in known refining agent composition, though oxygen is had high affinity, it is the reductor more weak than aluminium, magnesium and calcium.In this case, acidic oxidation silicon is reaction product, and this acidic oxidation silicon is because the activity that increases the viscosity of slag and reduce slag interalloy element has worsened the deoxidation process of alloying element.Worsen desulfurization condition simultaneously, the sulfide quantity of reduction slag and slag are to the adsorptive power of non-metallic inclusion.
All these causes worsening the quality of Finished Steel.Known a kind of refining of metal agent (SU, A, 456032), it contains the component of following ratio, weight %:
Mn 48-60
Si 28-32
Al 6-12
Ca 0.4-3.0
Mg 0.3-2.0
C 0.06-0.3
P 0.04-0.35
S 0.01-0.02
The Fe surplus
But be to use this known steel refining agent can not obtain the high target of desulfurization degree and removal non-metallic inclusion.
The one-tenth of the quality and quantity of this available refining agent assigns to explain.The first, what it contained quantity not sufficient has the element of high-affinity to oxygen, as calcium, magnesium, aluminium and silicon.
The second, in its composition, contain detrimental impurity-p and s.
The 3rd, it contains a large amount of manganese, and manganese and sulphur form meltable low melting point manganese sulfide in liquid metal, thereby are helpless to sulphur is entered in the slag.
Therefore the 4th, carbon is present in as impurity in the composition of known refining agent, must replenish interpolation carbon when finishing metal, and this cause after in the composition of Finished Steel sulphur content increase, thereby the quality of deterioration Finished Steel.
It also is inappropriate using known refining agent in using oxide material molten alloy process, because though the oxygen of the active element that has in the refining agent composition and oxide compound reacts rapidly, but, thereby can not obtain the steel of predetermined chemical composition because the little deoxidation degree of its quantity is not high.The process that can not have sweetening process simultaneously fully and reduce non-metallic inclusion content, thereby obtain low-quality steel.
Main purpose of the present invention is to improve the refining desulfuration of multipurpose steel and remove non-metallic inclusion.
Proposing according to the present invention of task is to make such multipurpose steel refining agent, because a certain proportion of component is arranged in this refining agent, it improves the refining desulfuration of steel and removes non-metallic inclusion.
Being proposed of task is to solve like this, and according to the present invention, multipurpose steel refining agent contains aluminium, silicon, calcium, magnesium, carbon and iron in its composition, and the ratio of these components is as follows, weight %:
Al 30-40
Si 35-25
Ca 5-15
Mg 7-5
C 20-10
The Fe surplus
The steel refining agent of being recommended both had been adapted at in the alloying process of iron alloy, be fit to again by from the oxide compound of alloying element with refining steel its reductive alloying process.
The multipurpose steel refining agent of being recommended can obtain to contain the steel of minimum content sulphur and non-metallic inclusion.
This is because there are quite a large amount of elements that have maximum avidity with oxygen in the refining agent composition of being recommended.
The existence of these elements provides the deoxidation of steel and has formed the possibility that easy nodularization non-metallic inclusion process combines when aforementioned proportion, and non-metallic inclusion is easy to later on enter in the covering slag.
Carry out the sweetening process of multipurpose steel simultaneously and remove formed sulfide process in the covering slag.
All above-mentioned situations all cause improving the quality of multipurpose steel.
The multipurpose steel refining agent of being recommended can mixture and alloy form use.
Mixture can be by the pure material of the principal element of maximum level or by pure material and compound, and the compound of forming as carbide of calcium and silicon carbide perhaps is made up of carbide of calcium, silicon carbide and the compound that contains the alloy composition of aluminium, magnesium and iron.
The multipurpose steel refining agent of being recommended is suitable for handling steel in steel teeming ladle.
The refining agent of being recommended is preferably in manganese and carries out using in the alloying process of steel, and manganese restores from the material that exists with oxide compound that contains it.
Because the slag that forms in the refining treatment process has high workability, it can have high absorption capacity with metal separation and to sulphur and non-metallic inclusion well.
In addition, this slag has good heat-insulating property and can prevent metal cools and reoxidation well.
All these because reduced the content of sulphur and non-metallic inclusion in the steel, all help to improve the performance of refining steel.
This is because the multipurpose steel refining agent recommended guarantees to obtain the metal of good deoxidation in steel teeming ladle because in the refining agent composition, contain q.s oxygen is had active element, these elements make the metal deoxidation and alloying element are reduced from oxide compound.Carry out the refining of metal desulfurization simultaneously and remove non-metallic inclusion.
Use the multipurpose steel refining agent recommended and combine with the material of the oxide compound that contains alloying element and can eliminate the scaling loss that oxygen is had active element, these active elements are to add in the multipurpose steel refining agent composition.
This is because the material that contains the oxide compound of alloying element just enters in the steel teeming ladle fusing rapidly and forms slag blanket, and the slag blanket prevention joins and in the multipurpose steel refining agent composition oxygen had the element of high-affinity by airborne oxygen oxidation.
When being evenly distributed in the metal volume with them, carry out the refining of steel with the alloying element oxide reduction.These reactions follow heat release, this just allows to add material under the situation of not preheating.Therefore, need be in steelmaking equipment not pre-thermometal or be provided for the additional unit of preheating, this helps to improve the quality of Finished Steel and reduces its cost after all.
Containing 30-40%Al and 25-35%Si in the multipurpose steel refining agent of recommending is enough for obtaining good deoxidation metal, this has caused the favourable condition of metal desulfurization, also make alloying element reach 95% at steel interalloy element from its oxide compound reductive rate of recovery from its oxide compound reduction.At this moment form the low-melting aluminum oxide in the slag and complex compound of silicon oxide of well swimming in, it can not worsen the flowability of slag, does not therefore reduce the adsorptive power of slag yet.
Aluminium content in the multipurpose steel refining agent composition is reduced to and is lower than 30%, so that silicone content must be increased to more than 35%, and this just causes worsening alloying element from its oxide compound reductive process.This is that acidic silicic acid salt reduces the activity of slag interalloy element because the acidic silicic acid salt in the slag-silicon oxide product increases, and slag becomes thickness, and quality conversion worsens in the slag, in addition, also reduces the adsorptive power to sulphur, and this just causes worsening the quality of steel.
Aluminium content is increased to greater than 40%, causes silicone content to be reduced to and is lower than 25%, and this also is unfavorable, enters the rate of recovery in the steel because can not increase alloying element.Increase the content of alumina inclusion in the metal simultaneously, this just worsens the quality of Finished Steel.
In addition, improve the price of refining agent, thereby also improve the price of steel, this is inappropriate when handling multipurpose steel.
The calcium contents that adds in the multipurpose steel refining agent composition is that 5-15% can reach low sulfur content in steel, and the form-equally distributed inclusion of acquisition spheric that influences non-metallic inclusion in magniferous composition.
Calcium is lower than 5% can not reaches low sulfur content in metal in multipurpose steel refining agent, thereby can not improve the quality of steel.
It is very difficult adding in the refining agent composition greater than 15%Ca, and this is because the high-vapor-pressure of calcium and to the high-affinity of oxygen, and main be the performance that can not cause improving steel, because can not cause further reduction sulphur, in addition, increase the price of refining own, thereby also increase the price of steel.
The magnesium that adds in the multipurpose steel refining agent composition is that 5-7% helps to obtain low residual sulphur content in containing the composition of calcium, because the non-metallic inclusion as a result of this processing has the nodularization shape, pulverized and be evenly distributed in the metal volume, improved the quality of Finished Steel like this.
Magnesium be lower than 5% since its contain quantity not sufficient the effect that makes the remarkable denaturing treatment of non-metallic inclusion can not be provided.Mg content is greater than 7% quality that does not cause improving Finished Steel.
Carbon content in multipurpose steel refining agent is that 10-20% makes steel carry out alloying with the high metal that absorbs carbon by enough carbon.The part consumption of carbon is in the metal deoxidation, and metal do not stain by deoxidation products, because form gaseous product-carbon monoxide.The deoxidation of metal height makes and is easy to realize effective refining desulfuration of steel and removes non-metallic inclusion.
Carbon content is lower than 10% and causes replenish adding carburelant, and the result has been owing to sulphur has increased sulphur content in the steel along with carbonaceous material enters together, thereby, because formation sulfide and oxide inclusion make the quality deteriorated of steel.
Carbon in the multipurpose steel refining agent composition is higher than 20% and limits the possibility that it uses in handling the low-carbon (LC) grade steel, in addition, also reduces in the steel refining process and effectively participates in components contents.
The iron amount that adds in the multipurpose steel refining agent composition is that 5-15% is necessary for the density that improves refining agent, and this can guarantee that refining agent sinks to metal-slag boundary scope.This moment alloying element takes place and reduce from slag, these alloying elements are included in the slag with oxide form.
In addition, carry out effective refining desulfuration of steel and remove non-metallic inclusion, reduced that also carbon is joined with the difficulty in the multipurpose steel refining agent composition of alloy form use, because iron promotes the solubleness of carbon to increase.
Iron level is lower than 5% can not guarantee that carbon with necessary amount joins in the multipurpose steel refining agent composition, and reduction may be trapped in the refining agent density in the slag, at this moment, causes that oxygen is had active melting loss of elements.
It is nonconforming that iron level is higher than 15%, because the density of the multipurpose steel refining agent of gained is too big, it infiltrates in the metal volume deeply, worsens the alloying element reduction process that enters in slag-metal junction region this moment, in addition, also reduce the content that oxygen and sulphur is had active element.These all cause worsening the quality of Finished Steel.
Suitably replenish adding in the multipurpose steel refining agent composition elemental oxygen, nitrogen, hydrogen and the sulphur that enters in the steel is had high chemically active rare earth element (RE), this can restrict rotten and purified performance.Rotten effect shows liquid phase and the capillary change of solid-liquid intersection, the variation that this can adjust the process of initial crystallization and influence the crystallization phases dispersity.The heterogeneous structure that obtains in cast steel can guarantee to obtain in afterwards the stocking thin smart crystal grain.
In addition, rare-earth sulfide has more negative free energy than other metallic sulfides.Can not form for example yielding manganese sulfide when having rare earth element to exist, because at first form inclusion-rare-earth sulfide, form complicated oxysulfide then and be mingled with, these inclusiones do not form strip in the operation of rolling of steel.In steel, exist the rare earth element of recommended amounts to make the dot generation of steel dialogue insensitive.
What meet the requirements is that the element ratio that adds in the multipurpose steel refining agent composition is weight %:
Al 30-40
Si 30-25
Ca 15-5
Mg 5-7
C 10-20
Rare earth element 5-1
The Fe surplus
In the multipurpose steel refining agent composition, reduce the absolute content that silicone content scope (be not 35-25 weight % but 30-25%) can reduce nonmetallic inclusionsin steel-silicate, the additional 1-5%(of adding weight in the refining agent composition) rare earth element can make the steel sex change and pulverize the oxide compound nonmetal inclusion that remains in the steel, and these are mingled with image hercynite-Al
2O
3FeO; Al
2O
3Deng.
This just guarantees to obtain high-quality steel, and this steel contains low sulfur amount in the finished product stocking, the non-metallic inclusion of suitable shape and composition and close grain.
In the multipurpose steel refining agent of recommending element ratio preferably, weight %:
Al 30-40
Si 35-25
Ca 15-5
Mg 5-7
C 10-12
Rare earth element 1-2
The Fe surplus
Reduce carbon content scope in the multipurpose steel refining agent composition (be not 10-20 weight % but 10-12 weight %), multipurpose steel refining agent is enlarged be used for low carbon content, for example 0.1%(weight at most) steel of carbon content.In the refining agent composition, replenish adding 1-2%(weight) rare earth element is for the grain refining of carrying out steel, more effectively desulfurization is enough, because the content that oxygen is had element-aluminium, silicon, calcium and the magnesium of high-affinity that joins in the multipurpose steel refining agent composition helps metal degree of depth deoxidation and desulfurization in steel teeming ladle.Therefore, add rare earth and only strengthen desulfidation, further guarantee metamorphism, this just causes improving the quality of steel and reduces non-metallic inclusion in the steel.
For the manufacturability of the preparation process that improves multipurpose steel refining agent and reduce its price, suitably add calcium, silicon and carbon, these elements add as the form with carbide of calcium and silicon carbide with industrial material forms.These materials are inexpensive and do not mix in transportation with in preserving.
Carbide of calcium is good metal sweetening agent and carburelant, and silicon carbide is simplified slagging process and helped to quicken the metal desulfurization and adsorb non-metallic inclusion effectively simultaneously.
Therefore, the multipurpose steel refining agent of being recommended is owing to reducing the quality that sulphur content in the steel and non-metallic inclusion have guaranteed to improve refining steel.
Multipurpose steel refining agent prepares with following method.
In capacity is 5 tons induction furnace, pack into aluminium and magnesium and be heated to 600-650 ℃ of temperature.Form protective atmosphere by supplying with rare gas element to bath surface then.Afterwards melt is heated to 1000-1100 ℃ of temperature and iron is added in the melt.After iron fusing and melt homogenizing, it is cooled to 550-600 ℃, then melt is poured in the pig bed, after its cooling, be crushed to the grade that needs.
In addition, can in having the vacuum induction furnace of similar temperature range, prepare the refining agent of recommending.
After this grade of acquisition, it is mixed with carbide of calcium and silicon carbide, then this mixture is added in the steel teeming ladle, with refining desulfuration and the removal non-metallic inclusion that carries out steel.
Use multipurpose steel refining agent as follows.
Will carry out the purified metal and in steelmaking equipment, carry out melting, can use any known device, for example the converter of open hearth, electric furnace, top blast, bottom blowing and the two associating oxygen blast, oxygen mixture, rare gas element and gas mixture thereof as steelmaking equipment.
In steelmaking equipment, obtain carbon containing and the work in-process molten steel that contains following chemical components, weight %:
C 0.05-0.3
Mn 0.05-0.1
The Si trace
The Al trace
S maximum 0.030
P maximum 0.025
The Fe surplus
Requirement and the concrete multipurpose steel that is proposed are depended in the selection that is used to produce the steelmaking equipment of carbon containing work in-process molten steel, and this can be determined by enterprise-steel mill (producer).
The carbon containing work in-process molten steel that will obtain in steelmaking equipment is put into capacity and steelmaking equipment quite or be the steel teeming ladle of one times of its capacity.
The process of putting into steel teeming ladle at carbon containing work in-process molten steel adds iron alloy or contains the material of oxide form alloying element and the multipurpose steel refining agent of being recommended.
The adding of all these materials proceed to carbon containing work in-process molten steel pour in the steel teeming ladle finish till.
Can use the material that contains manganese oxide, chromic oxide, vanadium oxide, titanium oxide as the oxide material that contains alloying element oxide, the regulation chemical ingredients of the steel of Huo Deing adds above-mentioned material separately or with various combination as requested.
Is of short duration at steel teeming ladle interalloy element by oxide compound reductive process, in fact pours in the steel teeming ladle and to finish and finish along with carbon containing work in-process molten steel.
The rate of recovery that alloying element enters steel reaches 90-97%.
Finish to finish the refining desulfuration of steel and remove non-metallic inclusion to tapping in the time of with alloying, this just can reach the quality of improving steel and reduce its processing cost.
Can improve the quality of steel when in the tapping process that uses the ferroalloy metallurgy steel, using the multipurpose steel refining agent of recommending, but degree is less.This may be to emit carbon containing work in-process molten steel from steelmaking equipment to be attended by so-called " slag " usually, the slag that promptly is present in the steelmaking equipment flows in the steel teeming ladle, this causes increasing the loss of oxygenant, because the high oxidation degree of slag has reduced the desulfurization of steel and increased non-metallic inclusion content.Phosphorus reduces fully from slag and changes in the steel.Intercepting slag and formation make complex technical processization and output are incurred loss based on new slag or the comprehensive slag from found slag mixture, improve the price of steel simultaneously, and this is not necessarily favourable when producing multipurpose steel.
Therefore, the multipurpose steel refining agent recommended of the most suitable use in the steel treating processes of carrying out alloying by oxide compound.
Add multipurpose steel refining agent and contain the material of alloying element oxide in the process of carbon containing work in-process molten steel being put into steel teeming ladle, can reduce to add and in the multipurpose steel refining agent composition of recommending oxygen is had the scaling loss of the element of high affinity.The material that contains alloying element oxide is melted in carbon containing reolled steel water surface and forms slag blanket and prevent that multipurpose steel refining agent from contacting with oxygen in the atmosphere in tapping process.Obtain the metal of abundant deoxidation, it is easy to desulfurization, improves the quality of Finished Steel simultaneously.
The multipurpose steel refining agent of recommending can use with form of mixtures, and this mixture is made up of carbide of calcium, silicon carbide and aluminium, magnesium, iron alloy.Such mixture is compared better technological properties with the principal element of the maximum level of component therein with the mixture that pure element exists, and is more cheap.
When the preparation mixture, use silicon carbide and carbide of calcium, contain weight %:SiC-97.82 in the silicon carbide composition; SiO-0.17; SiO
2-0.12; Al
2O
3-0.90; Fe
2O
3-0.43; CaO-0.3; MgO-0.26; Contain weight %:CaC in the carbide of calcium composition
2-78.9; CaO-17.3; Al
2O
3-1.6; SiO
2-0.8; Fe
2O
3-0.5; MgO-0.9.
The aluminium, magnesium and the iron alloy that add in the multipurpose steel refining agent composition make by each component of melting in 5 tons of induction furnaces.
In the crucible induction furnace of making by basic refractory, pack into aluminium and magnesium and under 600-650 ℃ with its fusing.Melt is heated to 1000-1100 ℃ then, feeds rare gas element at bath surface.In the superheated melt, add iron in batches, after it all melts, alloy is cooled to 550-600 ℃.Then alloy is cast on the pig iron base plate, after its cooling, is crushed to the grade that needs.In order to prevent magnesium and aluminaization, the melting of this alloy also can be carried out in vacuum induction furnace.
The multipurpose steel refining agent of recommending can use with alloy form.The first, can simplify the operation of preservation, preparation and the adding steel teeming ladle of refining agent.It does not resemble water funk branch the carbide of calcium, does not resemble to have high abrasive the silicon carbide yet, need not mix in special-purpose mixing tank.The second, have uniform chemical ingredients and density with the multipurpose steel refining agent of alloy form, this just guarantees the steady seepage of the refining process of steel in steel teeming ladle.The 3rd, utilize alloying constituent to regulate the activity of component to oxygen, sulphur and non-metallic inclusion.
Melting technology, temperature profile and casting process are similar to preparation aluminium, magnesium and iron alloy.
Use following material as batching:
Aluminium, content weight %:Al-99.8; Fe-0.12; Si-0.01; Cu-0.01; Zn-0.04; Ti-0.02;
Silicon metal, content weight %:Si-98.8; Fe-0.5; Al-0.5; CaO-0.2;
Calcium metal, content weight %:Ca-98.96; Al-0.1; Mg-0.5; Mn-0.05; N-0.06; O-0.3; Fe-0.01; Si-0.02;
MAGNESIUM METAL, content weight %:Mg-98.6; Ca-0.3; Al-0.5; Si-0.2; Mn-0.1; Cu-0.3;
Carbon (with the electrode fragment form of graphite element), content weight %:C-98.0 is loss-2.0 when taking exercise;
Iron, content weight %:Fe-99.5; C-0.1; S-0.003; P-0.005; Mn-0.2; Si-0.022; Cu-0.07; Zn-0.1;
The flint alloy, content weight %: rare earth element-98.0; The Fe-surplus.
Can add and use more inexpensive material in order to reduce the alloy price and to simplify the batching melting technology, for example:
Silicocalcium, content weight %:Ca-31; Si-65; Fe-3; Al-1;
Ferro-silicon, content weight %:Si-90.0; Mn-0.2; Cr-0.2; P-0.03; S-0.02; Al-3.5; Fe-6.05;
And chemical property approaching with the more welcome other materials of price.
The aluminium of recommending in multipurpose steel refining agent and the amount of silicon enable to obtain to have the metal of high deoxidation degree.
This has created advantageous conditions for the smooth desulfurization of steel, also makes alloying element and the maximum rate of recovery be arranged steel from its oxide compound reduction.The fusing point of the complicated non-metallic inclusion of formed aluminosilicate this moment is low and be easy to swim on the slag, does not reduce the physical-chemical performance (fusing point, flowability, viscosity, to adsorptive power of sulphur and non-metallic inclusion or the like) of slag simultaneously.
In multipurpose steel refining agent, violate the aluminium of recommendation and the content of silicon and cause the deterioration of deoxidation process, thereby reduce metal desulfurization degree.In addition, because the operational stage of slag destroys, worsen the reduction of alloying element from its oxide compound.Owing to reduced the flowability of slag, improved the viscosity and the fusing point of slag, thereby formed slag will not have needed adsorptive power.The steel of crossing with this material processing will have low mechanical property owing to high sulphur content and non-metallic inclusion.
Be present in calcium and magnesium in the multipurpose steel refining agent of recommendation with the amount of recommending, metal pour into steel teeming ladle during in can realize the desulfurization of steel and the modification of formed non-metallic inclusion, obtain high-quality steel at this moment.
The calcium of recommending in multipurpose steel refining agent and the content of magnesium increase or minimizing all causes reducing refining effect.Owing to being distributed in unevenly, high sulphur content and a large amount of thick non-metallic inclusion obtain low-quality steel in the metal volume.
With the carbon in the above-mentioned amount adding multipurpose steel refining agent composition, except the alloying action of metal, the also deoxidation of subparticipation metal, thereby help to improve sweetening process and help the purer steel of non-metallic inclusion content acquisition, owing to the carbon monoxide that generates with dissolved oxygen results of interaction is discharged from metal in the clear, simultaneously the skin of carbon monoxide bubble is active, is easy to adsorb the non-metallic inclusion of formation and it is entered in the slag.
Carbon content is reduced to the content that is lower than recommendation can causes adopting additional metal carburelant, this just causes manufacturability that reduces treating processes and the quality that causes worsening metal owing to the sulphur content increase of being brought into by these materials.Carbon content is increased to the content that is higher than recommendation just limits the steel that multipurpose steel refining agent is applied to low carbon content.The same content that reduces other compositions in the refining agent, because sulphur content and the increase of non-metallic inclusion amount, and, can cause the quality deteriorated of Finished Steel because the low reduction ratio of alloying element does not reach predetermined chemical ingredients.
The iron level of recommending in multipurpose steel refining agent is for increasing the required density of refining agent and carbon is necessary in the refining agent in order to increase.
Described iron level scope is changed the quality deteriorated of the steel that the multipurpose steel refining agent that can cause usefulness to be recommended was handled to high or low direction.This is to cause owing to oxygen is had active melting loss of elements, and this just causes reducing the desulfurization of steel, the reduction of alloy element and the sex change of non-metallic inclusion.
The iron level of recommending in multipurpose steel refining agent is necessary for the carbon content that increases the required density of refining agent and improve wherein.Violate the quality that the iron level scope that is proposed can worsen the steel of handling with the multipurpose steel refining agent of recommending,, just cause reducing the steel desulfurization, alloying element reduction and non-metallic inclusion modification because oxygen is had active melting loss of elements.
The concrete embodiments of the invention of implementing.
Embodiment 1
Use the multipurpose steel refining agent of recommending when in 350 tons of steel teeming ladles that have an alkaline liner, handling.
What will obtain in oxygen converter contains weight %:C-0.05; The Si-trace; Mn-0.05; S-0.014; P-0.012; The Al-trace; Fe-surplus, temperature are that 1640 ℃ carbon containing work in-process molten steel is put into steel teeming ladle.The multipurpose steel refining agent that contains Mn oxide material and recommendation that adds hot-work simultaneously with form of mixtures.The chemical ingredients that contains Mn oxide material is weight %:MnO-53.6; SiO
2-29.1; Fe
2O
3-3.9; Al
2O
3-3.3; P
2O
5-0.83; CaO-6.6; MgO-2.1; C-0.4; S-0.17.Its composition of multipurpose steel refining agent contains weight %:Al-40; Si-35; Ca-5; Mg-7; C-10; The Fe-surplus.When putting into the steel teeming ladle end, finishes on carbon containing work in-process molten steel processing.
The consumption that adds all material in the steel teeming ladle is: hot-work contain 3.8 tons of Mn oxide materials, the steel refining dosage of recommending according to the present invention is manganese oxide reduction and the necessary amount of steel refining.
The chemical ingredients of the steel that obtains is as follows, weight %:C-0.11; Mn-0.49; Si-0.21; S-0.003; P-0.014; Al-0.024; The Fe-surplus.
This moment, the rate of recovery of manganese was 98.2%, desulfurization degree 78.6%.
At casting apparatus (MH
3) upward the finished product molten steel is cast into the shaped form steel billet that the cross section is 350 * 1650mm, then billet rolling is become the sheet material of thick 10-30mm and carry out metallographic examination.Non-metallic inclusion content (grade) is: oxide compound-1.4; Sulfide-1.6; Silicate-2.1.The steel that is obtained is owing to the sulphur and the non-metallic inclusion of low levels have high quality.
Embodiment 2
As described in embodiment 1, in steel teeming ladle, metal is handled with the multipurpose steel refining agent of recommending.
Use and the same material that in embodiment 1, uses.
Obtain carbon containing work in-process molten steel in oxygen converter after, put it in the steel teeming ladle that has alkaline liner, the work in-process molten steel contains, weight %:C-0.05; The Si-trace; Mn-0.05; S-0.015; P-0.014; The Al-trace; The Fe-surplus.During emitting, the work in-process molten steel adds the multipurpose steel refining agent contain Mn oxide material and recommendation with the form of mixtures of carbide of calcium, silicon carbide and aluminium, magnesium, iron alloy.The multipurpose steel refining agent of Tui Jianing is converted into component and contains weight %:Al-30 simultaneously; Si-30; Ca-10; Mg-5; C-20; The Fe-surplus.
Acquisition contains the steel of following chemical components, weight %:C-0.12; Si-0.19; Mn-0.46; S-0.005; P-0.015; Al-0.020; The Fe-surplus.
This moment manganese the rate of recovery 91.4%, desulfurization degree 66.7%.
On casting apparatus, the finished product molten steel is cast into the shaped form steel billet of cross section 350 * 1650mm, then billet rolling is become the sheet material of thick 10-30mm and carry out metallographic examination.
Non-metallic inclusion content (grade) is: oxide compound-1.5; Sulfide-1.7; Silicate-2.0.
Because sulphur content and non-metallic inclusion content are low, the steel that obtains has high quality.
Embodiment 3
As described in embodiment 1 and 2, handle and casting finished product molten steel with the multipurpose steel refining agent of recommending.
The material that uses is also identical.
The carbon containing work in-process molten steel that obtains in oxygen converter contains weight %:C-0.06; The Si-trace; Mn-0.004; S-0.016; P-0.05; The Al-trace; The Fe-surplus.
Use the multipurpose steel refining agent of recommending with alloy form in order to handle in steel teeming ladle, this alloying constituent contains weight %:Al-40; Si-25; Ca-15; Mg-5; C-10; The Fe-surplus.
The steel that is obtained contains following chemical components, weight %:C-0.11; Si-0.19; Mn-0.48; S-0.006, P-0.015; Al-0.025; The Fe-surplus.
This moment, the rate of recovery of manganese was 97.6%, and desulfurization degree is 62.5%.
The non-metallic inclusion content (grade) of Finished Steel is: oxide compound-1.6, sulfide-1.8; Silicate-1.8.
Because sulphur content and non-metallic inclusion content are low, the steel that is obtained has high quality.
Embodiment 4
Use the multipurpose steel refining agent of recommending with form of mixtures to handle, mix ingredients contains, weight %:Al-30; Si-35; Ca-5; Mn-7; C-20; The Fe-surplus.
The melting of steel, refining and casting process such as above-mentioned embodiment 1-3.
Obtain after the carbon containing work in-process molten steel it to be handled in steel teeming ladle in oxygen converter, this work in-process molten steel contains; Weight %:C-0.04; The Si-trace; Mn-0.05; S-0.015; P-0.015; The Al-trace; The Fe-surplus.
The steel that obtains contains following chemical components, weight %:C-0.09; Si-0.21; Mn-0.48; S-0.006; P-0.016; Al-0.021; The Fe-surplus.
This moment, the rate of recovery of manganese was 95.4%, and desulfurization degree is 60.0%.
The non-metallic inclusion content (grade) of Finished Steel is: oxide compound-1.5; Sulfide-1.9; Silicate-2.0.
Embodiment 5
Fuse the processing of the steel of chromium in steel teeming ladle, use converter slag as the oxide material that contains chromium, converter slag contains following chemical components, weight %:Cr
2O
3-70.84; FeO-12.13, Al
2O
3-9.35; SiO
2-5.94; MgO-1.74.
With lime and fluorite as slag former.
In converter, obtain carbon containing work in-process molten steel and reach after 1650 ℃, put it into and have in the alkaline liner steel teeming ladle.The work in-process molten steel contains, weight %:C-0.06; The Si-trace; Mn-0.08; S-0.026; P-0.012; The Al-trace; Cr-0.10; Ni-0.59; Cu-0.51; The Fe-surplus.
The process of putting into steel teeming ladle at carbon containing work in-process molten steel adds 13.5 tons of chromium-containing oxide materials, 1.5 tons of lime, the multipurpose steel refining agent with alloy form of 0.02 ton of fluorite and recommendation.Contain weight %:Al-37 in the refining agent composition; Si-25; Ca-15; Mg-7; C-12; The Fe-surplus.
The steel that obtains has following chemical components, weight %:C-0.01; Si-0.95; Mn-0.62; Al-0.035; S-0.007; P-0.015; Cr-0.87; Ni-0.59; Cu-0.51; The Fe-surplus.
Add other alloying elements by adding iron alloy.
The rate of recovery of chromium is 86.2%, and desulfurization degree is 73.1%.
As described in embodiment 1 and 2 after the casting apparatus top casting and rolling into sheet material, carry out metallographic examination.
The metal of gained has the non-metallic inclusion of lower grade, and this just proves that metal has higher quality.
Non-metallic inclusion content is: oxide compound-1.5; Sulfide-1.8; Silicate-1.9.
Embodiment 6
Carry out metal treatment and casting as above-mentioned embodiment.The material that uses is with embodiment 5.
In converter, obtain after the carbon containing work in-process molten steel, in putting it into steel teeming ladle during in the multipurpose steel refining agent processing molten steel of alloy form.Contain weight %:C-0.06 in the reolled steel water constituent; The Si-trace; Mn-0.05; S-0.0022; P-0.012; The Al-trace; Cr-0.13; Ni-0.68; Cu-0.55; The Fe-surplus.Contain weight %:Al-35 in the multipurpose steel refining agent composition of alloy form; Si-30; Ca-7; Mg-5; C-20; Rare earth element; The Fe-surplus.
The steel that obtains has following chemical components, weight %:C-0.12; Si-1.01; Mn-0.73; S-0.007; P-0.013; Al-0.023; Cr-0.90; Ni-0.68; Cu-0.55; The Fe-surplus.
The rate of recovery of chromium from oxide compound is 96.2%, and desulfurization degree is 68.2%.
The metallographic examination of Finished Steel shows that the non-metallic inclusion content value is as follows: oxide compound-1.6; Sulfide-1.7; Silicate-1.6.Inclusion is spherical, and is finely divided.
Embodiment 7
In oxygen converter, obtain and have the work in-process molten steel of following chemical components, weight %:C-0.05; The Si-trace; Mn-0.05; S-0.021; P-0.015; The Al-trace; Cr-0.10; Ni-0.69; Cu-0.53; The Fe-surplus.Above-mentioned molten steel is put into steel teeming ladle during with the chromium multipurpose steel refining agent of recommending that contains it is handled therein.
Use the chromium-containing oxide identical with 6 and become residue material with embodiment 5.
The multipurpose steel refining agent of recommending uses with the form of mixtures that contains carbide of calcium, silicon carbide and alloy, and alloy contains magnalium, rare earth and iron, is converted into pure element in the refining agent composition and contains following ratio, weight %:Al-30, Si-28; Ca-15; Mg-6; C-10; Rare earth element-3; The Fe-surplus.
Put into the processing of finishing molten steel when steel teeming ladle finishes at carbon containing work in-process molten steel from steelmaking equipment.
The steel that obtains has following chemical components, weight %:C-0.10; Si-1.08; Mn-0.72; S-0.007; P-0.015; Al-0.024; Cr-0.87; Ni-0.69; Cu-0.53; The Fe-surplus.
At this moment, the rate of recovery of chromium from oxide compound is 96.2%, and desulfurization degree is 66.7%.
Metallographic examination draws following non-metallic inclusion content results: oxide compound-1.4; Sulfide-1.6; Silicate-1.7.Inclusion is spherical and finely divided.
Embodiment 8
Use identical with embodiment 5-7 chromium and the slagging material of containing.Put into steel teeming ladle neutralization therein treatment process and casting process as described in the embodiment 5-7.
Pending carbon containing reolled steel glassware for drinking water has following chemical components, weight %:C-0.05; The Si-trace; Mn-0.07; S-0.022; P-0.013; The Al-trace; Cr-0.10; Ni-0.68; Cu-0.53; The Fe-surplus.
Use the multipurpose steel refining agent of recommending with alloy form, its composition contains, weight %:Al-40; Si-26; Ca-10; Mg-6; C-12; Rare earth element-5; The Fe-surplus.
Finished Steel after the refining has following chemical components, weight %:C-0.10, Si-1.00; Mn-0.73; S-0.006; P-0.013; Al-0.026; Cr-0.88; Ni-0.68; Cu-0.53; The Fe-surplus.
The rate of recovery of chromium is 97.5%, and desulfurization degree is 72.7%.
After steel is cast and be rolling, non-metallic inclusion is carried out metallographic examination.The non-metallic inclusion content (grade) of steel is: oxide compound-1.7; Sulfide-1.4; Silicate-1.6.
Obtain high-quality steel, because sulphur content is low in the steel, non-metallic inclusion is spherical and finely divided, and is evenly distributed in the metal volume.
Embodiment 9
When the processing fusion has the multipurpose steel of manganese, use the multipurpose steel refining agent of recommending, contain weight %:Al-32 in the refining agent composition with alloy form; Si-35; Ca-8; Mg-7; C-11; Rare earth element-1.5; The Fe-surplus.
Use the material with same loss rate identical as containing Mn oxide material with embodiment 5.
Pending carbon containing reolled steel glassware for drinking water has following chemical components, weight %:C-0.05; The Si-trace; Mn-0.05; S-0.016; P-0.015; The Al-trace; The Fe-surplus.
This moment, the rate of recovery of manganese was 95.6%, and desulfurization degree is 68.8%.
The non-metallic inclusion content (grade) of steel is: oxide compound-1.4; Sulfide-1.7; Silicate-1.9.
Embodiment 10
Use is with the multipurpose steel refining agent of being recommended of alloy form, and the refining chemical ingredients is weight %:C-0.06; The Si-trace; Mn-0.05; S-0.018; P-0.015; The Al-trace; The carbon containing work in-process molten steel of Fe-surplus.The chemical ingredients of multipurpose steel refining agent is weight %:Al-38; Si-28; Ca-10; Mg-7; C-12; Rare earth element-2.0; The Fe-surplus.
Use and embodiment 1-4 and 9 identical materials.
The steel that obtains after refining finishes has following chemical components, weight %:C-0.10; Si-0.19; Mn-0.47; S-0.006; P-0.015; Al-0.021; The Fe-surplus.
The rate of recovery of manganese equals 93.2%, and desulfurization degree equals 66.7%.
As carrying out the casting of Finished Steel, later rolling and metallographic examination as described in the embodiment 1.
Obtain following non-metallic inclusion content results: oxide compound-1.5; Sulfide-1.7; Silicate-1.8.
Because the low sulphur content and the non-metallic inclusion of favourable shape and form, the steel of gained is high-quality.
The present invention for example is used for containing the refining process of manganese multipurpose steel at steel teeming ladle by means of the alloying refining process that can be used for steel from oxide compound reduction alloying element most effectively.This moment, the steel desulfurization was 60-80%, and non-metallic inclusion content (grade) is: oxide compound-1-2; Sulfide-1-2; Silicate-1.5-2.5.
Claims (3)
1, a kind of multipurpose steel refining agent, this refining agent contains aluminium, silicon, calcium, magnesium, carbon and iron, it is characterized in that, and it contains the component of following ratio, weight %:
Al 30-40
Si 35-25
Ca 5-15
Mg 7-5
C 20-10
The Fe surplus.
According to the refining agent of claim 1, it is characterized in that 2, replenish and contain rare earth element, this moment, it contained the component of following ratio, weight %:
Al 30-40
Si 30-25
Ca 15-5
Mg 5-7
C 10-20
Rare earth element 5-1
The Fe surplus.
According to the refining agent of claim 1, it is characterized in that 3, replenish and contain rare earth element, this moment, it contained the component of following ratio, weight %:
Al 30-40
Si 35-25
Ca 15-5
Mg 5-7
C 10-12
Rare earth element 1-2
The Fe surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100786 CN1053449A (en) | 1990-01-19 | 1990-01-19 | Multipurpose steel refining agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100786 CN1053449A (en) | 1990-01-19 | 1990-01-19 | Multipurpose steel refining agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1053449A true CN1053449A (en) | 1991-07-31 |
Family
ID=4876799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90100786 Pending CN1053449A (en) | 1990-01-19 | 1990-01-19 | Multipurpose steel refining agent |
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| Country | Link |
|---|---|
| CN (1) | CN1053449A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127617A (en) * | 2011-01-11 | 2011-07-20 | 刘治国 | Silicon-aluminum-calcium-magnesium alloy as well as preparation method and application thereof |
| CN102146518A (en) * | 2011-04-02 | 2011-08-10 | 钢铁研究总院 | Refining agent for atmosphere protected electro-slag re-melting |
-
1990
- 1990-01-19 CN CN 90100786 patent/CN1053449A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127617A (en) * | 2011-01-11 | 2011-07-20 | 刘治国 | Silicon-aluminum-calcium-magnesium alloy as well as preparation method and application thereof |
| CN102127617B (en) * | 2011-01-11 | 2012-11-28 | 刘治国 | Silicon-aluminum-calcium-magnesium alloy as well as preparation method and application thereof |
| CN102146518A (en) * | 2011-04-02 | 2011-08-10 | 钢铁研究总院 | Refining agent for atmosphere protected electro-slag re-melting |
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