CN105950882A - Remelting refining slag and method for applying remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel - Google Patents
Remelting refining slag and method for applying remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel Download PDFInfo
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- CN105950882A CN105950882A CN201610426088.2A CN201610426088A CN105950882A CN 105950882 A CN105950882 A CN 105950882A CN 201610426088 A CN201610426088 A CN 201610426088A CN 105950882 A CN105950882 A CN 105950882A
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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
Abstract
The invention provides remelting refining slag and a method for applying the remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel. The remelting refining slag comprises components in parts by weight as follows: 45-50 parts of CaF2, 15-20 parts of Al2O3, 15-20 parts of CaO, 8-10 parts of TiO2 and 5-7 parts of MgO. According to the method, firstly, the refining slag and a deoxidizing agent are roasted at 650-800 DEG C in a heat-insulated manner for 9-13 h, the high-Al and high-Ti alloy steel is used as a consumable electrode, the deoxidizing agent and the roasted remelting refining slag are added to a slag melting furnace to be melted, then the completely melted deoxidizing agent and remelting refining slag are poured into an electroslag remelting furnace, the electroslag remelting furnace is assembled, the voltage is adjusted to range from 60 V to 65 V, the current is adjusted to range from 9,500 A to 15,000 A, and remelting smelting is performed on the consumable electrode under protection of an inert gas. Al and Ti of steel ingots produced through the method are qualified in content and are evenly distributed.
Description
Technical field
The invention belongs to electrometallurgy technical field, relate to a kind of remelting refining slag and for high Al height Ti steel alloy
Electro-slag re-melting method.
Background technology
Electroslag remelting is that the resistance heat by slag makes comsumable melt, and metal drop is formed molten through molten slag layer
Pond, and in crystallizer, recrystallize a kind of method being frozen into steel ingot.Consutrode forms drop wash heat in fusing and coagulates
Gu during, the metallurgical physical reaction of Various Complex occurring, different steel grades are under different remelting processing systems, before and after remelting
Chemical composition change in various degree also will occur.When especially remelting contains the steel grade of Al, Ti element, Al, Ti are at electroslag
During remelting oxidizable, cause ESR ingot composition be difficult to control.
The patent of invention of Publication No. CN1059371, it is intended to solve electroslag remelting process and produce low aluminum (Al≤0.010%)
High-duty cast metal material.And the patent of invention of Publication No. CN101736164, it is intended to solve the electroslag remelting process high Ti of production low
The metal material of Al (Ti:2.4～3.2%, Al≤0.35%), and in prior art, the above slag system selected is suitable for Al, Ti
Alloy, the highest Al height Ti content and the suitable alloy of Al and Ti content, Al, Ti receive to obtain the uneven especially Ti exterior part of ingot
Tail receive deviation is big, the most existing slag system is not suitable for the electroslag remelting of such alloy.Electroslag such as GH37, GH35, GH500
In remelting, thus there is certain limitation and weak point.
Summary of the invention
For deficiencies of the prior art, the technical problem to be solved in the present invention is: for prior art electroslag
Remelting method is not particularly suited for the electroslag remelting of high Al height Ti steel alloy, and provides a kind of remelting refining slag and for high Al
The electro-slag re-melting method of high Ti steel alloy, make employing the method prepare remelted ingot in Al, Ti alloying component qualified and distribution
Uniformly.
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that a kind of remelting refining slag, including following weight
The component of amount part: CaF245 ~ 50 parts, Al2O315 ~ 20 parts, CaO 15 ~ 20 parts, TiO28 ~ 10 parts and MgO 5 ~ 7 parts.
The present invention is according to high Al height Ti and Al, the composition characteristic of the suitable steel alloy of Ti content, the remelting being specifically designed out
Refining slag, adds in this slag system and can suppress the TiO of titanium scaling loss in steel2, and add MgO be possible not only to improve slag at height
Viscosity under Wen, forms one and half solidification films at weld pool surface, prevents slag bath oxygen uptake and prevent from appraising at the current rate oxide in slag to metal
Molten bath transmission oxygen supply, moreover it is possible to improve Ti in slag3O5And Al2O3Activity coefficient, reduce TiO in slag2Activity coefficient, suppress TiO2
Transmission oxygen supply effect, further suppress Ti and Al scaling loss, makes high Al height Ti and Al, the suitable steel alloy of Ti content at electroslag remelting
Middle Al and Ti scaling loss amount is minimum, it is ensured that the ingot composition prepared is qualified, good quality.
Further, described remelting refining cinder ladle includes the component of following weight portion: CaF250 parts, Al2O320 parts, CaO 15
Part, TiO2 10 parts and MgO 5 parts.
Unstable oxide such as SiO in the slag of this component2Content is low, adds about 15 parts of CaO and makes the oxygen content in slag decline,
Stable cocrystalization compound is formed, to the high adsorption capacity being mingled with in molten steel after slag system fusing.Owing to Ti is unstable appraising at the current rate
Oxide, adds the TiO of quality about 10 parts in slag2Inhibited to steel grade.Additionally between the slag-metal of this component slag
Interfacial tension big, it is poor that profit invaded by steel by slag, and steel grade is mingled with or presss from both sides the phenomenon reduction of steel in slag, and the loss of metal also reduces,
Active element Al, Ti receive to uprise.
Further, SiO in each component of described remelting refining slag2Mass content all≤1.0%.The present invention is further
In order to avoid the Al element in steel alloy is burnt, each component SiO in strict control slag system2Content is less than or equal to 1.0%, by Al
The scaling loss amount of element falls below minimum.
Use the above-mentioned remelting refining slag electro-slag re-melting method to high Al height Ti steel alloy, comprise the steps:
1) by above-mentioned remelting refining slag afterheat baking 9 ~ 13 hours at 650 ~ 800 DEG C；
2) using high Al height Ti steel alloy as consutrode, by remelting refining joining of slag baked to deoxidizer and step 1)
Fusing in slag hearth, wherein, the addition of described remelting refining slag is the 4 ~ 5% of described consutrode weight；Described deoxidizer is matter
The titanium-iron powder of amount ratio 1 ~ 3:2 ~ 4 and aluminium powder, the mass ratio of described deoxidizer total addition level and remelting refining slag is 12 ~ 17:1000；
Described high Al height Ti steel alloy be Al mass content be 1.7～3.5%, Ti mass content be the steel alloy of 1.7～3.5%；
3) by step 2) melt deoxidizer and remelting refining slag completely and pour in electroslag refining furnace, assemble electroslag refining furnace,
Regulation voltage 60 ~ 65V, electric current 9500 ~ 15000A, carry out refusion and smelting to described consutrode under inert gas shielding；Its
In, smelting process adds titanium-iron powder and aluminium powder and carries out deoxidation, the mass ratio of described titanium-iron powder and aluminium powder is 1:1, titanium-iron powder and
The total addition level of aluminium powder is 0.6 ~ 1.0:1000 with the mass ratio of described consutrode.
Above-mentioned remelting refining slag is used to carry out electroslag remelting, it is possible to Al and the Ti element being prevented effectively from steel alloy is burnt
Damage, make the remelted ingot prepared ensure that high Ti and Al content, and for during steel alloy electroslag remelting of the present invention slag mutually in
Easily produce the oxide that appraises at the current rate, the present invention especially through research, finally find regulation voltage 62 ~ 64V, electric current 10000 ~
13000A, is filled with according to above-mentioned remelting refining slag, the addition of deoxidizer, can guarantee that slag bath surface temperature is low, further
Reduce the scaling loss amount of Al and Ti element, make the remelted ingot composition prepared qualified.
Further, the diameter ratio controlling described consutrode and electroslag refining furnace crystallizer is 0.7 ~ 0.75:1, more preferably
Ground, the diameter of described consutrode and electroslag refining furnace crystallizer is than most preferably 0.75:1.As such, it is possible to farthest reduce
The thermal radiation oxidation of consutrode surface, reduces the scaling loss of alloying component.
Further, noble gas described in step 3) is argon, and flow velocity is 15 ~ 20 L/min, it is highly preferred that the stream of argon
Speed most preferably 20 L/min.Being passed through argon with such flow velocity, can reduce the oxygen concentration in slag bath, shield electrode surface is not subject to
Radiant heat aoxidizes, and reduces scaling loss further.
As optimization, described in step 3) smelting process, titanium valve and aluminium powder are all added according to the speed of 7 ~ 12g/min.
Adopt in smelting process, continuously and uniformly add titanium valve and aluminium powder in such a way, the deoxidation in slag bath can be made more thorough
The end, make Al and Ti melting loss of elements in alloy less.
As optimization, described consutrode length of embedment in slag bath is 0.5 ~ 0.7:1 with the diameter ratio of consutrode,
It is highly preferred that the diameter of length of embedment and consutrode is than most preferably 0.5:1.Use such length of embedment, can control low
Valency oxide and the reaction of gas phase oxygen, reduce the transmission speed of oxygen, reduces the scaling loss of Al and Ti.
As another optimization, between the crystallizer of described electroslag refining furnace and bottom water case, it is provided with asbestos layer.Use such
Insulation measures, advantageously reduces slag bath surface temperature, and then reduces oxidation, reduces the scaling loss of Al and Ti element in alloy.
Optimizing as another, described high Al height Ti steel alloy is GH37 steel alloy, GH35 steel alloy or GH500 steel alloy.
The inventive method is more preferable to the remelting effect of GH37 steel alloy, GH35 steel alloy or GH500 steel alloy, can at utmost ensure Al
It is not burnt with Ti element.Described GH37 steel alloy [Al] wt.%:1.8～2.3, [Ti] wt.%:1.7～2.3, GH35 alloy
Steel [Al] wt.%:2.1～2.5, [Ti] wt.%:2.0～2.8, GH500 steel alloy [Al] wt.%:2.75～3.25, [Ti]
Wt.%:2.75～3.25.
Compared to existing technology, there is advantages that
1, the present invention be directed to high Al height Ti and Al, the composition characteristic of the suitable steel alloy of Ti content, the remelting being specifically designed out essence
Refining slag, adds in this slag system and can suppress the TiO of titanium scaling loss in steel2, and add MgO be possible not only to improve slag at high temperature
Under viscosity, form one and half solidification films at weld pool surface, prevent slag bath oxygen uptake and the preventing oxide that appraises at the current rate in slag from melting to metal
Pond transmission oxygen supply, moreover it is possible to improve Ti in slag3O5And Al2O3Activity coefficient, reduce TiO in slag2Activity coefficient, suppress TiO2Pass
Pass oxygen supply effect, further suppress Ti and Al scaling loss, make high Al height Ti and Al, the suitable steel alloy of Ti content in electroslag remelting
Al and Ti scaling loss amount is minimum, it is ensured that the ingot composition prepared is qualified, good quality.
2, the present invention is by controlling to smelt voltage, electric current and slag charge loading, and controls the length of embedment of consutrode, control
Having made oxide and the reaction of gas phase oxygen, reduced the transmission speed of oxygen, reduce further the scaling loss amount of Ti and Al, the present invention is also
By arranging asbestos layer in the middle of crystallizer and bottom water case, reduce the surface temperature of slag bath, further auxiliary and reduce scaling loss amount,
Make alloying component in the steel ingot prepared qualified, and head, middle and end portion alloying component is evenly distributed.
3, in the slag system that the present invention uses, component is easily obtained, and the device used in method is fexible unit, method parameter
Easily controllable, it is more convenient for carrying out commercial introduction, there is good market prospect.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.The implementation case with the technology of the present invention is being
Implement under premise, now provide detailed embodiment and concrete operating process to illustrate that the present invention is creative, but
Protection scope of the present invention is not limited to below example.
The diameter ratio all controlling described consutrode and electroslag refining furnace crystallizer in following embodiment is 0.7 ~ 0.75:1；
Consutrode length of embedment in slag bath is 0.5 ~ 0.7:1 with the diameter ratio of consutrode；The crystallization of described electroslag refining furnace
It is provided with asbestos layer between device and bottom water case.
Embodiment 1 electroslag remelting GH37 alloy
Using GH37 alloy as consutrode, consutrode base a size of ∮ 450mm, crystallizer a size of ∮ 600mm.
Select the remelting refining slag of following parts by weight of component: CaF250 parts, Al2O320 parts, CaO 15 parts, TiO2 10 parts
With MgO 5 parts.Wherein, CaF2、Al2O3、CaO、TiO2With SiO in MgO2Mass content all≤1.0%.
Adopt and with the following method GH37 alloy is carried out electroslag remelting, comprise the steps:
1) by above-mentioned remelting refining slag afterheat baking 10 hours at 800 DEG C,
2) using above-mentioned GH37 alloy as consutrode, electroslag refining furnace is assembled, by weight baked to deoxidizer and step 1)
Molten refining slag, joins fusing in specialization slag hearth, and slag is poured in remelting furnace after all having melted；Wherein, described remelting essence
The addition of refining slag is described in 240kg(the 4% of consutrode weight)；The quality adding deoxidizer during describedization slag is 3600g,
Described deoxidizer is titanium-iron powder and aluminium powder, and it is 1350g that described titanium-iron powder adds quality, and the addition quality of aluminium powder is 2250g；
3) step 2) slag all melted and poured into after in remelting furnace, regulates voltage 64V, and electric current 11500A, in inert gas argon
Under gas shielded, described consutrode is carried out refusion and smelting, smelting process adds titanium-iron powder and aluminium powder carries out deoxidation, titanium-iron powder
Being 0.8:1000 with the mass ratio of the total addition level of aluminium powder Yu described consutrode, the mass ratio of described titanium-iron powder and aluminium powder is 1:
1, the total amount that described titanium-iron powder and aluminium powder add is 4800g.The flow speed control of described argon is 20 L/min, institute in smelting process
State titanium valve and aluminium powder to be added according to the speed of 9g/min.
Consutrode GH37 steel alloy standard [Al] %:1.8～2.3, [Ti] %:1.7～2.3.Prepare the electroslag of 6 tons of weight
Ingot, carries out performance detection to prepared ESR ingot, and result is as shown in table 1 below, and before non-remelting, in consutrode, the content of Al is 2%,
The content of Ti is 2.1%, and the recovery rate of the electroslag ingot Al obtained as can be seen from Table 1 is 94%, deviation within 5%, the receipts of Ti
Yield is 98%, and deviation is within 9%, and ingot head, middle part, afterbody Al, Ti are evenly distributed.
Al, Ti mass content distribution (%) in steel ingot after table 1 remelting
Embodiment 2 GH35 alloy electroslag remelting
Using GH35 alloy as consutrode, consutrode base a size of ∮ 490mm, crystallizer a size of ∮ 650mm.
Select the remelting refining slag of following parts by weight of component: CaF245 parts, Al2O320 parts, CaO 20 parts, TiO2 8 parts and
MgO 7 parts.Wherein, CaF2、Al2O3、CaO、TiO2With SiO in MgO2Mass content all≤1.0%.
Adopt and with the following method GH35 alloy is carried out electroslag remelting, comprise the steps:
1) by above-mentioned remelting refining slag afterheat baking 13 hours at 650 DEG C,
2) using above-mentioned GH35 alloy as consutrode, electroslag refining furnace is assembled, by weight baked to deoxidizer and step 1)
Molten refining slag, joins fusing in specialization slag hearth, and slag is poured in remelting furnace after all having melted；Wherein, described remelting essence
The addition of refining slag is described in 260kg(the 4.3% of consutrode weight)；The quality adding deoxidizer during describedization slag is
3900g, described deoxidizer is titanium-iron powder and aluminium powder, and it is 1463g that described titanium-iron powder adds quality, and the addition quality of aluminium powder is
2427g；
3) step 2) slag all melted and poured into after in remelting furnace, regulates voltage 65V, and electric current 10500A, in inert gas argon
Under gas shielded, described consutrode is carried out refusion and smelting, smelting process adds titanium-iron powder and aluminium powder carries out deoxidation, described titanium
The mass ratio of iron powder and aluminium powder is the total addition level of 1:1, titanium-iron powder and aluminium powder and the mass ratio of described consutrode is 0.9:
1000, the total amount that described titanium-iron powder and aluminium powder add is 5400g.The flow speed control of described argon is 20 L/min, smelting process
Described in titanium valve and aluminium powder be added according to the speed of 11g/min.
Consutrode GH35 steel alloy standard [Al] %:2.1～2.5, [Ti] %:2.0～2.8.Prepare the electricity of 6 tons of weight
Slag ingot, carries out performance detection to prepared ESR ingot, and result is as shown in table 2 below, and before non-remelting, in consutrode, the quality of Al contains
Amount is 2.50%, and the mass content of Ti is 2.30%, and the recovery rate of the electroslag ingot Al obtained as can be seen from Table 2 is 94%, deviation
Within 5%, the recovery rate of Ti is 98%, and deviation is within 8%, and ingot head, middle part, afterbody Al, Ti are evenly distributed.
Al, Ti mass content distribution (%) after table 2 GH35 alloy remelting
Embodiment 3 GH500 alloy electroslag remelting
Using GH500 alloy as consutrode, consutrode base a size of ∮ 525mm, crystallizer a size of ∮ 700mm.
Select the remelting refining slag of following parts by weight of component: CaF248 parts, Al2O319 parts, CaO 18 parts, TiO29 parts
With MgO 6 parts.Wherein, CaF2、Al2O3、CaO、TiO2With SiO in MgO2Mass content all≤1.0%.
Adopt and with the following method GH500 alloy is carried out electroslag remelting, comprise the steps:
1) by above-mentioned remelting refining slag afterheat baking 11 hours at 700 DEG C,
2) using above-mentioned GH500 alloy as consutrode, electroslag refining furnace is assembled.By weight baked to deoxidizer and step 1)
Molten refining slag, joins fusing in specialization slag hearth, and slag is poured in remelting furnace after all having melted；Wherein, described remelting essence
The addition of refining slag is described in 300kg(the 5% of consutrode weight)；The quality adding deoxidizer during describedization slag is 4500g,
Described deoxidizer is titanium-iron powder and aluminium powder, and it is 1687g that described titanium-iron powder adds quality, and the addition quality of aluminium powder is 2813g；
3) step 2) slag all melted and poured into after in remelting furnace, regulates voltage 63V, and electric current 12000A, in inert gas argon
Under gas shielded, described consutrode is carried out refusion and smelting, smelting process adds titanium-iron powder and aluminium powder carries out deoxidation, described titanium
The mass ratio of iron powder and aluminium powder is the total addition level of 1:1, titanium-iron powder and aluminium powder and the mass ratio of described consutrode is 0.9:
1000, the total amount that described titanium-iron powder and aluminium powder add is 5400g.The flow speed control of described argon is 20 L/min, smelting process
Described in titanium valve and aluminium powder be added according to the speed of 11g/min.
Consutrode GH500 steel alloy [Al] %:2.75～3.25, [Ti] %:2.75～3.25.Prepare the electricity of 6 tons of weight
Slag ingot, carries out performance detection to prepared ESR ingot, and result is as shown in table 3 below, and before non-remelting, in consutrode, the quality of Al contains
Amount is 3.0%, and the mass content of Ti is 2.95%, and the recovery rate of the electroslag ingot Al obtained as can be seen from Table 3 is 97%, deviation
Within 4%, the recovery rate of Ti is 98%, and deviation is within 6%, and ingot head, middle part, afterbody Al, Ti are evenly distributed.
Al, Ti mass content distribution (%) after table 3 GH500 alloy remelting
Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, although with reference to the most real
Execute example the present invention has been described in detail, it will be understood by those within the art that, can be to the technical side of the present invention
Case is modified or equivalent, and without deviating from objective and the scope of technical solution of the present invention, it all should be contained in the present invention
Right in the middle of.
Claims (10)
1. a remelting refining slag, it is characterised in that include the component of following weight portion: CaF245 ~ 50 parts, Al2O3 15~20
Part, CaO 15 ~ 20 parts, TiO28 ~ 10 parts and MgO 5 ~ 7 parts.
Remelting refining slag the most according to claim 1, it is characterised in that include the component of following weight portion: CaF250 parts,
Al2O320 parts, CaO 15 parts, TiO2 10 parts and MgO 5 parts.
Remelting refining slag the most according to claim 1, it is characterised in that SiO in each component2Mass content all≤1.0%.
4. use the claim 1 ~ 3 arbitrary described remelting refining slag electro-slag re-melting method to high Al height Ti steel alloy, its feature
It is, comprises the steps:
1) by arbitrary for claim 1 ~ 3 described remelting refining slag afterheat baking 9 ~ 13 hours at 650 ~ 800 DEG C；
2) using high Al height Ti steel alloy as consutrode, by remelting refining joining of slag baked to deoxidizer and step 1)
Fusing in slag hearth, wherein, the addition of described remelting refining slag is the 4 ~ 5% of described consutrode weight；Described deoxidizer is matter
The titanium-iron powder of amount ratio 1 ~ 3:2 ~ 4 and aluminium powder, the mass ratio of described deoxidizer total addition level and remelting refining slag is 12 ~ 17:1000；
Described high Al height Ti steel alloy be Al mass content be 1.7～3.5%, Ti mass content be the steel alloy of 1.7～3.5%；
3) by step 2) melt deoxidizer and remelting refining slag completely and pour in electroslag refining furnace, assemble electroslag refining furnace,
Regulation voltage 60 ~ 65V, electric current 9500 ~ 15000A, carry out refusion and smelting to described consutrode under inert gas shielding；Its
In, smelting process adds titanium-iron powder and aluminium powder and carries out deoxidation, the mass ratio of described titanium-iron powder and aluminium powder is 1:1, titanium-iron powder and
The total addition level of aluminium powder is 0.6 ~ 1.0:1000 with the mass ratio of described consutrode.
Electro-slag re-melting method the most according to claim 4, it is characterised in that control described consutrode and electroslag refining furnace knot
The diameter ratio of brilliant device is 0.7 ~ 0.75:1.
Electro-slag re-melting method the most according to claim 4, it is characterised in that noble gas described in step 3) is argon, stream
Speed is 15 ~ 20 L/min.
Electro-slag re-melting method the most according to claim 4, it is characterised in that titanium valve and aluminium powder described in step 3) smelting process
All it is added according to the speed of 7 ~ 12g/min.
Electro-slag re-melting method the most according to claim 4, it is characterised in that described consutrode length of embedment in slag bath
It is 0.5 ~ 0.7:1 with the diameter ratio of consutrode.
Electro-slag re-melting method the most according to claim 4, it is characterised in that the crystallizer of described electroslag refining furnace and bottom water case
Between be provided with asbestos layer.
Electro-slag re-melting method the most according to claim 4, it is characterised in that described high Al height Ti steel alloy is GH37 alloy
Steel, GH35 steel alloy or GH500 steel alloy.
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| CN110938745A (en) * | 2019-11-19 | 2020-03-31 | 河南中原特钢装备制造有限公司 | 825 nickel-based alloy electroslag remelting slag system and preparation method thereof |
| CN112410573A (en) * | 2020-10-30 | 2021-02-26 | 东北大学 | Slag system for smelting Ce-containing Fe-Ni soft magnetic alloy and use method thereof |
| CN113832353A (en) * | 2021-09-15 | 2021-12-24 | 山西太钢不锈钢股份有限公司 | Electroslag smelting process for low-silicon, low-nitrogen and high-aluminum steel |
| CN114381609A (en) * | 2021-12-09 | 2022-04-22 | 重庆材料研究院有限公司 | Slag for electroslag remelting of GH625 alloy |
| CN114480870A (en) * | 2021-12-03 | 2022-05-13 | 秦皇岛核诚镍业有限公司 | Electroslag remelting method for titanium-containing iron-nickel base alloy |
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