CN105603204B - Austenite Valve Steel remelting covering slag and preparation method thereof - Google Patents
Austenite Valve Steel remelting covering slag and preparation method thereof Download PDFInfo
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- CN105603204B CN105603204B CN201610159698.0A CN201610159698A CN105603204B CN 105603204 B CN105603204 B CN 105603204B CN 201610159698 A CN201610159698 A CN 201610159698A CN 105603204 B CN105603204 B CN 105603204B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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Abstract
The invention discloses a kind of austenite Valve Steel remelting covering slag and preparation method thereof, the covering slag includes following mineral constituent and its percentage by weight is：Alumina powder 18 ~ 22%, calcium powder 18 ~ 22%, electric smelting magnesium powder 0 ~ 2.0%, fluorite 56 ~ 60%, barium carbonate 0.1 ~ 2%, bastnaesite 0.1 ~ 2%, the fluorite are by de- SiO2The high product fluorite of processing.Covering slag desulfurized effect of the present invention is good, and water content is few, and product is graininess, at the scene without dust pollution in use, has environment-friendly function.
Description
Technical field
The present invention relates to a kind of covering slag and preparation method thereof, more particularly, to a kind of austenite Valve Steel remelting covering slag
And preparation method thereof.
Background technology
With the fast development of social sophisticated technology, higher want is proposed to new function material and new structural material
Ask, and electroslag remelting technique is also developed by leaps and bounds and applied.Electroslag metallurgy technology is a kind of metal or alloy Refining
And solidification control complex technique, its product have high purity, uniform ingredients, mechanical property and performance are good, nearly end is emerging,
The features such as process control, therefore in many key areas for producing high-end product or key position.Because electroslag remelting has
Equipment is simple, easily operated, lower-cost advantage, in addition to degassing is not as good as vacuum arc remelting, in crystalline structure, surface of steel ingot
Vacuum arc remelting is superior in terms of finish, desulfurization and removal of inclusions ability.Therefore, many space flight and aviation, military project, the energy
Material is turned to and produced by electroslag remelting.
With flourishing for Domestic Automotive Industry, internal combustion engine type and yield are continuously increased, with automobile engine height
Delivery temperature caused by power rises, and exhaust gas purification rate standard improves and the demand of automotive light weight technology, anti-corrosion to material
Property, wearability, inoxidizability, high-temperature behavior and heat resistance etc. propose the requirement of harshness.Air valve is work important on engine
Make part and consumable accessory, its condition of work is extremely severe, and frequently reciprocal height is subjected in high temperature, high pressure, corrosivity combustion gas
Speed motion and friction, impact load is big, therefore it is required that have higher high-temperature behavior, anti-wear performance, corrosion resistant performance etc., its work
Quality directly influences the service behaviour of engine, therefore the material requirements for preparing air valve is also extremely harsh.Austenite Valve Steel is
It is used to manufacturing automobile, motorcycle engine air bleeding valve application both at home and abroad at present very wide.But as China introduces industrially developed country
The advanced type of internal combustion engine and technology, it is desirable to which Valve Steel has a higher quality and performance, and existing trade mark austenite Valve Steel is basic
The needs for introducing type can not be met, therefore research and develop remelting austenite Valve Steel to turn into the task of top priority.
The patent of invention of Application No. 201110388235.9 is related to a kind of electroslag remelting high temperature alloy slag system and its made
Use method.The weight proportion of slag charge is：CaF2：45 ~ 50%, Al2O3：20 ~ 25%, CaO：17 ~ 22%, MgO：3 ~ 5%, TiO2：
3 ~ 6%, SiO2：0.1 ~ 0.6%；Remaining is FeO, C and impurity；The slag charge fusing point of the invention is relatively low, is adapted to the height of low melting point
Temperature alloy is smelted.A kind of titaniferous stainless steel electroslag remelting covering slag of the disclosure of the invention of Application No. 201310077925.1, under
The raw material for stating parts by weight is made：46.0 ~ 50.0 parts of fluorite, 20.0 ~ 24.0 parts of alumina powder, 18.5 ~ 22.5 parts of lime, electric smelting
3.5 ~ 5.5 parts of magnesia, 2.0 ~ 4.0 parts of titanium dioxide；Its component ratio is：SiO20.0 ~ 0.6 part, 18.0 ~ 22.0 parts of CaO,
Al2O320.0 ~ 24.0 parts, 4.2 ~ 5.8 parts of MgO, TiO22.0 ~ 4.0 parts, CaF245.0 ~ 51.0 parts, 0.03 part of S ＜, C ＜
0.03 part.The covering slag passes through strict quality control standard slag making, it is ensured that its impurity content is low, purity is high, drying is anhydrous
Part, desulfurization, deoxidation can be strengthened in esr process.But lack the purifying to raw material and pretreatment work in the prior art
Skill, exist to covering slag total quality and adversely affect.
The content of the invention
In view of this, the purpose of the present invention is in view of the shortcomings of the prior art, there is provided a kind of austenite Valve Steel remelting is protected
Slag and preparation method thereof is protected, effectively increases austenite Valve Steel strand greasy property, adsorbs inclusion content in melting steel, further drop
The impurity content of low steel billet, improves Cleanliness of Molten Steel, technically has innovative demonstration effect.
To reach above-mentioned purpose, the present invention uses following technical scheme：
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 18 ~ 22%, calcium powder 18 ~ 22%, electric smelting magnesium powder 0 ~ 2.0%, fluorite 56 ~ 60%, barium carbonate 0.1 ~ 2%, bastnaesite 0.1 ~
2%, the fluorite is by de- SiO2The high product fluorite of processing.
Preferably, the covering slag includes following chemical constituent and its percentage by weight is：CaF2 55.0~61.0%、CaO
18.0~22.0%、Al2O3 18.0~22.0%、SiO2 ≤0.6%、MgO 0~2.0%、BaO 0.1~1.0%、CeO20.1 ~ 1.0%,
Remaining is impurity, impurity≤0.5%, in impurity, FeO≤0.12%, C≤0.022%, P≤0.0048%, S≤0.019%.
Preferably, the de- SiO2Handle after being melted for iron aluminium electrode to fluorite to SiO in fluorite2Reduction generation silicon
Ferro-aluminum removes SiO2。
Preferably, the fusing point of the covering slag is：1450℃±30℃；The granularity of the covering slag：0.5mm≤granularity≤
15mm。
Preferably, 650 DEG C when, moisture≤0.06wt% of the covering slag.
A kind of preparation method of austenite Valve Steel remelting covering slag, comprises the following steps：Stock-weighing-stirring-
Electric furnace melting--50 ~ 80 DEG C of hot-working of stir-coming out of the stove-broken-packaging.
Preferably, it is described to be packaged as using packaging of aluminium foil bag heat seal immediately after product is broken.
Before our company researches and develops austenite Valve Steel remelting covering slag, although in the market has similar electro slag remelting slag reason
Change index, but can not meet the production needs of high-end Valve Steel.The basic full electroslag remelting covering slag by import Germany watt gram is
Can meet production needs, and watt gram product price per ton it is very high, cause producing cost very high.Inventor passes through to protection
The trace element of slag and the public relations of production technology, particularly SiO2Control, meet production needs, fully meet German watt
The level of gram product, steel mill's producing cost have obtained significantly reducing.Compared with former vacuum arc remelting covering slag, electroslag
Remelting device is simple, producing cost is low, easy to operate, ingot casting any surface finish, thermoplasticity is good, lumber recovery is high.Electroslag austenite gas
Valve steel is to ensure austenite Valve Steel under the conditions of high temperature, high corrosion, can have good resistance to elevated temperatures and corrosion resistance
Energy.The production of austenite Valve Steel remelting covering slag is stirred 5~10 minutes after electric furnace fully melts, to ensure that physicochemical property fills
Divide uniform；Using water cooling quick forming method, to ensure the consistency of slag and prevent from making moist.And it is directly related to austenite air valve
The heat-resisting quantity and corrosion resistance of steel are the purity of steel and the uniformity of tissue.
SiO in austenite Valve Steel remelting covering slag2, C, S, P, Pb and Bi content requirement it is especially low, so control material
Field trash is the important key of quality after guarantee austenite Valve Steel remelting.Therefore should be set from the chemical composition of remelting covering slag
Meter, physical property are determined, the selection with residue material and feature are analyzed.
The boiling point of the electroslag remelting covering slag is higher than the temperature of electroslag slag bath, ensures that Electroslag Process is stable, reduces slag
Volatilization loss；The fusing point of slag is less than seasoning metal fusing point, ensures ingot casting forming effect；The slag composition is attached in low melting eutecticses point
Closely, liquation phenomenon during slag crust solidification is reduced, prevents that slag composition from changing and slag crust is blocked up；With higher resistivity, can produce
Enough heats, ensure metal molten, overheat and the progress of refining, to improve electroslag remelting electrical efficiency, power consumption is compared in reduction；Have
Good mobility, to ensure slag bath thermal convection current under high temperature, make ingot casting or casting radial direction stable and uniform, the things such as desulfurization are removed in guarantee
Change reaction to carry out；Without unstable oxide FeO, MnO etc. and the oxide M e that appraises at the current ratexOy, it is therefore prevented that metal oxygenation；Slag has
Higher alkalisation, it is effectively guaranteed the progress of reflow process sweetening process；Slag has well to non-metallic inclusion at high temperature
Moistening, absorption and solvability；Solid slag has certain moisture resistance, is not susceptible to aquation；The slag and remelting gold
It is larger to belong to linear expansion coefficient difference, ensures that slag crust is readily removed.
The selection of electroslag remelting slag, proportioning and the quantity of slag to the metallurgical quality of Electro Slag Remelting Steel, melting technique economic indicator and
Environmental protection is very significant considering that.In order to meet the requirement of every technical-economic index, it is necessary to from fusing point, electrical conductivity, viscosity,
Every physicochemical properties such as basicity, surface tension, specific heat capacity, vapour pressure, air permeability are considered, and can just be selected rationally
Slag type.With reference to the physicochemical property stability and produce reality situation of electroslag remelting covering slag finished product, austenite Valve Steel remelting
Covering slag is mainly with CaF2、CaO、Al2O3Based on.It is described as follows：1）CaF2The fusing point, viscosity and surface of slag can be reduced
Power；But, pure CaF higher compared to electrical conductivity2At 1650 DEG C, electrical conductivity reaches 4.54s/cm, but CaF2When content is high, easily put in melting
Go out pernicious gas and flue dust, pollute environment, therefore CaF2Parts by weight are 55.0~61.0 parts；2) CaO can increase the basicity of slag, carry
High desulfurization efficiency, and the electrical conductivity of slag can be reduced, but CaO water imbibitions are strong, easily bring hydrogen and oxygen into, cause steel oxygenation, hydrogenation, therefore
CaO parts by weight are 18.0~22.0 parts；3).Al2O3The electrical conductivity of slag can be substantially reduced, reduces power consumption, improves productivity ratio, but slag
Middle Al2O3Increase, will make slag fusion temperature and viscosity rise, and will reduce slag desulfurized effect, reflow process can be made in addition
It is difficult to set up and stably, therefore Al2O3Parts by weight are Al2O318.0~22.0 parts；4) .MgO can form one layer on slag bath surface
Half solidification film, it can prevent slag bath oxygen uptake and the preventing oxide that appraised at the current rate in slag from being supplied oxygen to metal bath transmission, so that oxygen in ingot casting,
Hydrogen, nitrogen content reduce, but MgO easily improves the viscosity of slag, therefore MgO parts by weight are 0~2.0 part；5)SiO2It can drop
The fusing point of low slag, the high-temp plastic of slag is improved, be ingot casting any surface finish, can also reduced the electrical conductivity of slag, steel grade can also be changed
The form of field trash, it is steel deformation easy to process.But SiO in slag2Content is excessive, in reflow process, is reduced into Si, with
Again can be with the oxygen reaction generation SiO in air during air contact2, and reduced again by alloying element in steel, after reacting repeatedly, make
Alloying element scaling loss is serious into Valve Steel, therefore SiO2Parts by weight are 0.0~0.6 part.The electroslag remelting covering slag of the present invention
Impurity content it is low, purity is high, dries exclusion.
Easily there is impurity content exceeding index phenomenon in reflow process in austenite Valve Steel, causes billet quality not reach requirement.
Austenite air valve steel functional remelting protection materials improve the resistivity of remelting slag, remelting with that can strengthen remelting desulfurization, deoxidation
The starting the arc is stable without stopping, lubricating the function such as good in journey, and so as to reach casting billet surface finishing, impurity content is low, is produced for remelting
Direct motion provide technical support.Because quality is good, is widely used, as the achievement converts rapidly, other covering slags will be promoted to produce
Enterprise is updated the replacement to its product, improves the technical merit of itself, so as to greatly promote technical progress of industry.
The beneficial effects of the invention are as follows：
1st, remelting covering slag desulfurized effect is good, and remelting covering slag impurity content is especially low, because selection material is particularly severe, Du
Absolutely because material purity is not high bring impurity content too high cause quality wild effect, the particularly choosing of high-purity fluorite
Select.Reach grade it is qualified after, also need further in electric furnace purification reduce SiO2Content, avoid SiO in finished product2Content
It is too high and cause impurity content to uprise.Product, which has, strengthens remelting desulfurization, deoxidation, improves the resistivity of remelting slag, reflow process
The middle starting the arc is stable without stopping, lubricate the features such as good.In use, steel grade remelting difficult point is can be combined with to adjust dispensing
Ratio, to reach suitable Technology For Remelting condition.Therefore, in terms of the product technical performance and use range in itself, all have
Technological innovation.
2nd, the protection residue product is graininess, at the scene without dust pollution in use, has environment-friendly function.
3rd, hot-working production method is taken product, controls the moisture content at 650 DEG C to reach less than 0.06%, makes remelting slag
It need to can be direct plungeed into use 800 DEG C of methods for toasting 3 hours, save great amount of cost before having been overturned when using at the scene.
Embodiment
Embodiment 1
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 22%, calcium powder 18%, electric smelting magnesium powder 1.0%, fluorite 57%, barium carbonate 1%, bastnaesite 1%；Wherein, fluorite is process
De- SiO2The high product fluorite of processing, take off SiO2Handle as 1550 DEG C, iron aluminium electrode carries out melt process 3 hours to fluorite, by fluorite
Middle SiO2Reduction generation ferro-silico aluminium removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 59.0%、CaO 18.0%、Al2O3
18.3%、SiO2 0.4%、MgO 2.0%、BaO 1.0%、CeO21.0%, remaining is impurity, wherein, FeO 0.07%, C
0.030%、P 0.0008%、S 0.009%。
A kind of preparation method of austenite Valve Steel remelting covering slag, comprises the following steps：Stock-weighing-stirring-
Electric furnace melting--50 DEG C of hot-working of stir-coming out of the stove-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag is：0.5mm, fusing point are：At 1450 DEG C, 650 DEG C, the moisture of covering slag is 0.06wt%.
This covering slag is used for C steel mills, surface quality defect 0.36%.
Embodiment 2
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 21%, calcium powder 22%, electric smelting magnesium powder 0.8%, fluorite 56%, barium carbonate 0.1%, bastnaesite 0.1%；Wherein, fluorite is
By taking off SiO2The high product fluorite of processing, take off SiO2Handle and melt process is carried out 2 hours to fluorite for 1600 DEG C of iron aluminium electrodes, will
SiO in fluorite2Reduction generation ferro-silico aluminium removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 55.5%、CaO 21.5%、Al2O3
21.3%、SiO2 0.6%、MgO 0.7%、BaO 0.1%、CeO20.1%, remaining is impurity, wherein, FeO 0.07%, C
0.016%、P 0.004%、S 0.01%。
The preparation method of the covering slag, comprises the following steps：Stock-weighing-stirring-electric furnace melting-is stirred-gone out
Stove -50 DEG C hot-working-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：1.0mm；Fusing point is：1460℃；During 650 DEG C of covering slag, the moisture of the covering slag is
0.04wt%.This covering slag is used for C steel mills, surface quality defect 0.35%.
Embodiment 3
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 20%, calcium powder 20%, electric smelting magnesium powder 1.82%, fluorite 57.5%, titanium dioxide 0.18%, barium carbonate 0.25%, bastnaesite
0.25%；Wherein, fluorite is by de- SiO2The high product fluorite of processing, take off SiO2Handle and fluorite is carried out for 1600 DEG C of iron aluminium electrodes
Melt process 2.5 hours, by SiO in fluorite2Reduction generation ferro-silico aluminium removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 59.0%、CaO 19.0%、Al2O3
20%、SiO2 0.3%、MgO 1.0%、BaO 0.2%、CeO2 0.2%、TiO20.18%, remaining is impurity, wherein FeO 0.02%,
C 0.022%、P 0.0048%、S 0.019%。
A kind of preparation method of austenite Valve Steel remelting covering slag, comprises the following steps：Stock-weighing-stirring-
Electric furnace melting--70 DEG C of hot-working of stir-coming out of the stove-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：10mm；Fusing point is：1480℃；At 650 DEG C, the moisture of covering slag is 0.03wt%.Will
This covering slag is used for C steel mills, surface quality defect 0.10%.Titanium is used as addition element in steel, thus it is possible to vary the performance of steel,
The addition of a small amount of titanium can make protection slag melting point of a relatively high, while have certain lubrication, improve the property of covering slag
Matter, make billet surface finish more preferable.
Embodiment 4
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 21%, calcium powder 18%, fluorite 60%, barium carbonate 0.5%, bastnaesite 0.5%；Wherein, fluorite is by de- SiO2Processing
High product fluorite, take off SiO2Handle and melt process is carried out 2 hours to fluorite for 1550 DEG C of iron aluminium electrodes, by SiO2Reduction generation silicon
Ferro-aluminum removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 59.0%、CaO 19.2%、Al2O3
20.0%、SiO2 0.34%、BaO 0.6%、CeO20.6%, remaining is impurity, wherein FeO 0.12%, C 0.022%, S
0.018%、P 0.0040%。
The preparation method of the covering slag, comprises the following steps：Stock-weighing-stirring-electric furnace melting-is stirred-gone out
Stove -60 DEG C hot-working-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：8mm；Fusing point is：1480℃；At 650 DEG C, the moisture of covering slag is 0.03wt%.By this
Covering slag is used for C steel mills, surface quality defect 0.28%.
Embodiment 5
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 18%, calcium powder 21%, electric smelting magnesium powder 1.4%, fluorite 58%, barium carbonate 0.8%, bastnaesite 0.8%；Wherein, fluorite is
By taking off SiO2The high product fluorite of processing, take off SiO2Handle and melt process carried out 2 hours to fluorite for 1600 DEG C of iron aluminium electrodes,
SiO2Reduction generation ferro-silico aluminium removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 55.0%、CaO 20.5%、Al2O3
22%、SiO2 0。18%、MgO 1.6%、BaO 0.7%、CeO20.7%, remaining is impurity, wherein FeO 0.03%, C 0.002%, P
0.003%、S 0.010%。
The preparation method of the covering slag, comprises the following steps：Stock-weighing-stirring-electric furnace melting-is stirred-gone out
Stove -50 DEG C hot-working-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：6mm；Fusing point is：1450℃；At 650 DEG C, the moisture of covering slag is 0.01wt%.By this
Covering slag is used for C steel mills, surface quality defect 0.30%.
Embodiment 6
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 20%, calcium powder 20%, electric smelting magnesium powder 0.3%, fluorite 59.3%, barium carbonate 0.2%, bastnaesite 0.2%；Wherein, fluorite
For by de- SiO2The high product fluorite of processing, take off SiO2Handle and melt process carried out 3 hours to fluorite for 1600 DEG C of iron aluminium electrodes,
By SiO2Reduction generation ferro-silico aluminium removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 59.0%、CaO 22.0%、Al2O3
18.0%、SiO2 0.28%、MgO 0.2%、BaO 0.2%、CeO20.2%, remaining is impurity, wherein FeO 0.04%, C
0.002%、P 0.002%、S 0.007%。
The preparation method of the covering slag, comprises the following steps：Stock-weighing-stirring-electric furnace melting-is stirred-gone out
Stove -70 DEG C hot-working-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：13mm；Fusing point is：1440℃；At 650 DEG C, the moisture of covering slag is 0.05wt%.Will
This covering slag is used for C steel mills, surface quality defect 0.25%.
Embodiment 7
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 20%, calcium powder 19%, electric smelting magnesium powder 1.0%, fluorite 60%；Wherein, fluorite is by de- SiO2The high product fluorite of processing,
De- SiO2Melt process is carried out 2 hours to fluorite for 1600 DEG C of iron aluminium electrodes, by SiO in fluorite2Reduction generation ferro-silico aluminium removes
SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 61.0%、CaO 19.0%、Al2O3
18.8%、SiO2 0.1%、MgO 0.17%、BaO 0.3%、CeO20.3%, remaining is impurity, wherein FeO 0.10%, C
0.015%、S 0.015%、P 0.002%。
The preparation method of the covering slag, comprises the following steps：Stock-weighing-stirring-electric furnace melting-is stirred-gone out
Stove -60 DEG C hot-working-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：6mm；Fusing point is：1440℃；At 650 DEG C, the moisture of covering slag is 0.02wt%.By this
Covering slag is used for C steel mills, surface quality defect 0.33%.
Embodiment 8
A kind of austenite Valve Steel remelting covering slag, the covering slag includes following mineral constituent and its percentage by weight is：
Alumina powder 18%, calcium powder 19%, electric smelting magnesium powder 2.0%, fluorite 60%, barium carbonate 0.5%, bastnaesite 0.5%；Wherein, fluorite is
By taking off SiO2The high product fluorite of processing, take off SiO2Handle and melt process is carried out 3 hours to fluorite for 1600 DEG C of iron aluminium electrodes, will
SiO in fluorite2Reduction generation ferro-silico aluminium removes SiO2。
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 61.0%、CaO 18.3%、Al2O3
18%、SiO2 0.1%、MgO 1.5%、BaO 0.45%、CeO20.45%, remaining is impurity, wherein FeO 0.02%, C 0.022%,
P 0.003%、S 0.010%。
The preparation method of the covering slag, comprises the following steps：Stock-weighing-stirring-electric furnace melting-is stirred-gone out
Stove -80 DEG C hot-working-broken-packaging of aluminium foil bag heat seal.
The granularity of gained covering slag：15mm；Fusing point is：1420℃；At 650 DEG C, the moisture of covering slag is 0.06wt%.Will
This covering slag is used for C steel mills, surface quality defect 0.33%.
Comparative example 1, by the TiO in embodiment 32Reject, other do not change.Comparing embodiment 3 and comparative example 1, gained
This covering slag is used for C steel mills by covering slag, and surface quality of billet defect is 0.37%.
Surface quality of billet defect：Embodiment is less than comparative example, so, embodiment effect is better than comparative example.
Comparative example 2, SiO will be taken off in embodiment 12The high product fluorite of processing is replaced with common fluorite.Protected obtained by comparative example
This covering slag is used for C steel mills by 1390 DEG C of slag melting point, gained covering slag, and surface quality of billet defect is 1.5%.SiO2It can drop
The fusing point of low slag, the high-temp plastic of slag is improved, be ingot casting any surface finish, can also reduced the electrical conductivity of slag, steel grade can also be changed
The form of field trash, it is steel deformation easy to process.But SiO in slag2Content is excessive, in reflow process, is reduced into Si, with
Again can be with the oxygen reaction generation SiO in air during air contact2, and reduced again by alloying element in steel, after reacting repeatedly, make
Alloying element scaling loss is serious into Valve Steel, has a strong impact on steel billet property, thus surface quality of billet defect is substantially compared with embodiment 1
Seriously.
Comparative example 3, packaging of aluminium foil bag bonding operation in embodiment 1 is sealed with cool drying and replaced, at 650 DEG C, opened
Packaging measure this comparative example covering slag water content is 1wt%, needs 800 DEG C of heat dryings to can be only achieved water content in 3 hours<
0.06wt%, meet standard, come into operation.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, this area is common
Other modifications or equivalent substitution that technical staff is made to technical scheme, without departing from technical solution of the present invention
Spirit and scope, all should cover among scope of the presently claimed invention.
Claims (3)
1. a kind of austenite Valve Steel remelting covering slag, it is characterised in that the covering slag includes following mineral constituent and its weight
Percentage is：Alumina powder 18 ~ 22%, calcium powder 18 ~ 22%, electric smelting magnesium powder 0 ~ 2.0%, fluorite 56 ~ 60%, barium carbonate 0.1 ~ 2%, fluorine
Carbon cerium ore deposit 0.1 ~ 2%, the fluorite are by de- SiO2The high product fluorite of processing；
The covering slag includes following chemical constituent and its percentage by weight is：CaF2 55.0~61.0%、CaO 18.0~22.0%、
Al2O3 18.0~22.0%、SiO2≤0.6%、MgO 0~2.0%、BaO 0.1~1.0%、CeO20.1 ~ 1.0%, remaining is impurity, miscellaneous
Matter≤0.5%, in impurity, FeO≤0.12%, C≤0.022%, P≤0.0048%, S≤0.019%；
The de- SiO2Handle after being melted for iron aluminium electrode to fluorite to SiO in fluorite2Reduction generation ferro-silico aluminium removes
SiO2；
A kind of preparation method of described austenite Valve Steel remelting covering slag, comprises the following steps：Stock-weigh-stir
Mix-electric furnace melting-stir-to come out of the stove -50 ~ 80 DEG C of hot-working-broken-packaging；
It is described to be packaged as using packaging of aluminium foil bag heat seal immediately after product is broken.
2. a kind of austenite Valve Steel remelting covering slag according to claim 1, it is characterised in that the covering slag melts
Put and be：1450℃±30℃；The granularity of the covering slag：0.5mm≤granularity≤15mm.
3. according to a kind of any described austenite Valve Steel remelting covering slag of claim 1, it is characterised in that at 650 DEG C, institute
State moisture≤0.06wt% of covering slag.
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| CN110029229B (en) * | 2019-04-28 | 2024-04-26 | 江苏星火特钢集团有限公司 | Electroslag remelting slag system for duplex stainless steel |
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| CN103122413A (en) * | 2013-03-12 | 2013-05-29 | 河南省西保冶材集团有限公司 | Titaniferous stainless steel electroslag remelting casting powder |
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| CN102312105A (en) * | 2010-06-04 | 2012-01-11 | 辽宁天和科技股份有限公司 | Remelted slag for electro-slag remelting titanium-containing plate blank and production method thereof |
| CN102268611B (en) * | 2011-07-07 | 2012-12-19 | 徐振伟 | Fe-based heat-resisting alloy and preparation method thereof |
| CN102794438B (en) * | 2012-07-20 | 2014-01-22 | 浙江电渣核材有限公司 | Low hydrogen control method for electroslag remelting |
| CN102776380A (en) * | 2012-08-08 | 2012-11-14 | 江西省科学院应用物理研究所 | Method for preparing regenerated high-speed steel material through electroslag metallurgy and adding rear earth oxide |
| CN104164529A (en) * | 2013-09-11 | 2014-11-26 | 襄阳康捷飞龙电气有限公司 | Method for producing cast iron by adopting remelting furnace blowing smelting and purification, and apparatus thereof |
| CN103468964B (en) * | 2013-09-18 | 2015-05-20 | 安徽工业大学 | New slag system for synchronously controlling hydrogen-oxygen content of electroslag ingot and preparation method thereof |
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| CN103122413A (en) * | 2013-03-12 | 2013-05-29 | 河南省西保冶材集团有限公司 | Titaniferous stainless steel electroslag remelting casting powder |
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