CN105803216A - Method for protecting titanium by applying returned slag in titanium-containing steel electroslag remelting - Google Patents
Method for protecting titanium by applying returned slag in titanium-containing steel electroslag remelting Download PDFInfo
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- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
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Abstract
The invention provides a method for protecting titanium by applying returned slag in titanium-containing steel electroslag remelting. According to the invention, an electroslag remelting process is adopted, titanium-containing steel is taken as a consumable electrode, returned slag and new remelting slag are adopted as electroslag, and during remelting, reaction of titanium element in the titanium-containing steel with TiO2 in electroslag is inhibited to prevent melting loss, thus achieving the purpose of protecting titanium, wherein the returned slag is produced after electroslag remelting is carried out on the titanium-containing steel. By adopting the method disclosed by the invention to carry out electroslag remelting on the titanium-containing steel, the titanium protecting rate can be controlled to be above 63%, the titanium protecting effect is good, the fluctuation range of titanium content in the obtained steel ingot is controlled to be within 1%, titanium distribution is uniform, and impurity content caused by titanium melting loss can be well controlled to be in a reasonable scope.
Description
Technical field
The invention belongs to Summoning material electrometallurgy technical field, relate to electrometallurgy technical field, be specifically related in a kind of Ti-containing steel electroslag remelting and apply the method returning slag guarantor's titanium.
Background technology
Titanium belongs to the active element of very easily scaling loss, therefore how to ensure electroslag remelting steel ingot Ti receive to be always up the problem that smelter author takes much count of.Due to CaF2、Al2O3Deng in slag system constituent element containing SiO2, the oxide such as FeO, if slag charge has more unstable oxide, it is difficult to avoid the scaling loss of these oxidizable elements in steel, or cause the height composition skewness along remelted ingot, make steel ingot head, in, afterbody composition fluctuation relatively larger, time serious chemical composition beyond ingredient standard and scrap.
It is omnidistance blowing argon gas in smelting process that traditional electroslag protects titanium, then adds Al powder or TiO in slag bath2In deoxidation powder, and the membership that adds of substantial amounts of deoxidation powder materials makes the composition of slag charge change, and can increase the silicon in steel ingot, manganese equal size, cause off analysis, and a large amount of additions of deoxidizer also can make the field trash of steel grade increase, and affects the performance of steel.Additionally in recent years that the requirement of steel ingot gas content is more and more higher, the moisture in new slag system is not easy thoroughly to toast removal, it is easy to causes steel ingot gas content defective, causes certain harmful effect.
Summary of the invention
For prior art above shortcomings, the technical problem to be solved in the present invention is: how to provide application in a kind of Ti-containing steel electroslag remelting to return the method that slag protects titanium, titanium is effective, Ti content is uniformly distributed to make the Ti-containing steel for preparing protect, it is possible to have good performance reliably.
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that in a kind of Ti-containing steel electroslag remelting, application returns the method that slag protects titanium, adopt electroslag remelting process, using Ti-containing steel as consutrode, adopt and return slag and new remelting slag as electroslag, described return slag is the recovery electroslag after Ti-containing steel carries out electroslag remelting, suppresses the titanium elements in Ti-containing steel and the TiO in electroslag in reflow process2React and be burnt, reach to protect titanium purpose.
By studying, the present invention finds that in Ti-containing steel, the process of the scaling loss of [Ti] is:
Steel-slag interfacial reaction:
Slag-vapor interface reaction:
In above formula: [] is composition in Ti-containing steel, () is composition in slag, and { } is composition in gas phase.
It is the oxide that appraises at the current rate from above formula (1) (2) known Ti, due to high oxide TiO2With metal high price Ti reaction, generation oxide Ti at a low price3O5；And low oxide reacts with gas phase oxygen, gas phase indirectly constantly by slag bath oxygen supply, generates again high oxide, again returns to steel-slag interface and react with [Ti] in alloy, so repeatedly making [Ti] constantly scaling loss in alloy, such reaction essence is exactly TiO2It is the oxygen supply person of Ti oxidation.
The present invention and prior art protect titanium method is the most essential to be distinctive in that: the present invention is added without deoxidation dusty material in the esr process of Ti-containing steel, but according to the reaction principle of Ti scaling loss in alloy, is drawing TiO2It is on the basis of oxygen supply person of Ti oxidation, only adds 3～6 parts of TiO at new remelting slag on the one hand2, avoid adding TiO in smelting process2, use returns slag and the mixing of new remelting slag as electroslag on the other hand, returns oxide unstable in slag and is reduced and content minimizing, makes titanium elements exist with suitable state in returning slag, Ti3O5Content tends to saturated, inhibits Ti melting loss of elements well by the collaborative compatibility effect of these two aspects；And return slag also improves the purity of refining slag system, advantageously reduce the gas content of steel grade, desirably prevent the further scaling loss of Ti element.
Further, described new remelting slag includes the component of following weight portion: 20～30 parts of CaF2, 30～40 parts of Al2O3, 20～30 parts of CaO, 3～6 parts of MgO and 3～6 parts of TiO2.Select the remelting slag of so brand-new proportioning, have relatively low fusing point and viscosity, the gentle good mobility of higher slag, can reduce the breathability of slag, improve deoxidation degassing ability.
Further, described return slag is adopt described new remelting slag, as electroslag, Ti-containing steel carries out the recovery electroslag after electroslag remelting.Select such return slag, it is possible to make the TiO in electroslag2Content is less, suppresses titanium elements scaling loss in Ti-containing steel further.
Further, the weight of described return slag and new remelting slag and be: G_ slag=π/4 × D^2 × H_ slag × γ _ slag, wherein D is the diameter of crystallizer, and H is the degree of depth (generally taking 1/2～1/3 times of crystallizer diameter) of slag, and γ is the proportion under slag liquid melting temperature.The gross weight number of described electroslag is 100 parts, wherein, returns slag and accounts for 60～80 parts, and brand-new remelting slag accounts for 20～40 parts.Use the Ti returned in slag3O5Content has tended to this feature saturated, when using the return slag remelting again of 60～80 parts to use, can effectively suppress titanium elements scaling loss in Ti-containing steel, reach to protect titanium purpose.
Further, above-mentioned preparation method specifically includes following steps:
1) slag charge prepares: is crushed by described return slag and toasts 2～3 hours in 300～400 DEG C, is toasted 7～9 hours in 600～700 DEG C by described new remelting slag；
2) starting the arc slag making: using Ti-containing steel as consutrode, assemble electroslag refining furnace, the energising starting the arc, it is initially charged new remelting slag in the crystallizer of described electroslag refining furnace, and addition aluminium powder and titanium-iron powder carry out pre-deoxidation in new remelting slag, after described new remelting slag, aluminium powder and titanium-iron powder melt, add return slag, set up slag bath；Wherein, the mass ratio of described aluminium powder, titanium-iron powder and new remelting slag is 2～3:1～2:100；
3) melting: step 2) described new remelting slag and return after slag is completely melt, regulate electric current 6700～7000A, voltage 50～53V and carry out the melting of consutrode, fusion process passes into inert protective gas, flow velocity 3～5L/min.
When specifically preparing, carry out afterheat baking to returning slag and new remelting slag respectively, make the moisture of slag fully remove, return slag not hygroscopic, reduce the gas content in steel grade to titaniferous steel ingot in gas content few, there is more excellent performance；Being initially charged new remelting slag during starting the arc slag making and first set up dynamic equilibrium by each component, because returning slag remelting, the built eutectic constituent element erecting balance of each component, so adding after returning slag.Consutrode is when the starting the arc, new remelting slag adds new remelting slag weight 2～3% aluminium powder, add new remelting slag and weigh the titanium-iron powder of 1～2% and carry out pre-deoxidation, it is possible to reduce the oxygen content in slag system, suppress the de-titanium reaction of gasification, desirably prevent the titanium elements scaling loss in the starting the arc stage.
Further, said method also includes step 4) fill feeding: step 3) after consumable electrode melting completes, adopt classification small area analysis method that the titaniferous steel ingot obtained is carried out feeding, prior to feeding under 4000～4300A 4～6 minutes, feeding 2～4 minutes under 2500～2800A, finally feeding 1～2 minute under 1000～1200A.Steel ingot so can be made to realize plentiful feeding effect, improve the consistency of steel ingot, it is to avoid produce the situation that interior tissue is loose.
Further, step 1) in return slag is crushed to granularity≤5mm.So, one is return to add conveniently less than the return slag of 5mm granule, and fusing is very fast；Two is will not to the fluctuation causing slag bath.
Further, described noble gas is argon.Argon is adopted to have better protective effect as noble gas; air in electroslag refining furnace can be discharged to a greater extent, it is to avoid reflow process medium alloy steel and air contact, effectively prevent the oxidation of steel alloy; and argon less expensive, economic performance is better.
Further, described Ti-containing steel is 0Cr18Ni10Ti steel alloy.0Cr18Ni10Ti steel alloy is suppressed the better effects if of titanium elements scaling loss by the present invention.
Further, the river bottom protection plate of described crystallizer is identical with Ti-containing steel steel grade.So, the surface of steel ingot obtained will not be covered with other alloy or metal, and prepared steel ingot purity is higher.
Compared to existing technology, there is advantages that
1, the inventive method and prior art protect that titanium method is the most essential to be distinctive in that: be added without deoxidation dusty material in smelting process, and electroslag when adopting new remelting slag and return slag mixing as electroslag remelting, when the steel grade higher for Ti-containing steel particularly Ti content and alloy, owing to returning slag after the purification refine of a remelting, oxide unstable in slag is reduced and content minimizing, the oxide Ti of oxidizable Ti element simultaneously3O5Content increases in slag and tends to saturated, therefore titanium elements in Ti-containing steel can be suppressed well to be burnt；And return slag also improves the purity of refining slag system, advantageously reduce the gas content in Ti-containing steel, desirably prevent the further scaling loss of titanium elements.
2, the inventive method use return slag as part slag charge, due to return slag not hygroscopic, be more reduction of the gas content in steel grade to titaniferous steel ingot in gas content few, there is more excellent performance.
When 3, adopting the inventive method that Ti-containing steel is carried out electroslag remelting, protecting titanium rate and control more than 63%, protect titanium effective, in the steel ingot obtained, Ti content fluctuation range controls within 1%, titanium is evenly distributed, and can control impurity thing content that titanium scaling loss causes preferably in the reasonable scope.
4, the inventive method make use of return slag as electroslag, has saved slag charge resource, has reduced production cost, reclaims slag use and also reduces the dust pollution produced in fusion process, improves the service life of equipment, the advantage with environmental protection, sustainable development.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.The implementation case is carried out under premised on the technology of the present invention, now provides 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.
All using 0Cr18Ni10Ti titaniferous steel alloy as consutrode in following embodiment, Ti content is 0.65%, and C content is 0.08%, standard-required finished product Ti >=5 × C%, i.e. Ti >=0.4%.
Embodiment 1
In a kind of Ti-containing steel electroslag remelting, application returns the method that slag protects titanium, comprises the steps:
(1) electrode prepares: adopting induction furnace to smelt 0Cr18Ni10Ti and pour into a mould ∮ 180mm electrode bar, adopt water-cooled copper crystallizer, crystallizer diameter is ∮ 320mm.
(2) slag charge prepares: new remelting slag includes the component of following weight portion: 25 parts of CaF2, 35 parts of Al2O3, 30 parts of CaO, 4 parts of MgO and 6 parts of TiO2, new remelting slag is toasted 9 hours in 600～700 DEG C；Return slag is crushed to granularity≤5mm, toasts 2 hours through 300～400 DEG C；Returning slag is adopt described new remelting slag, as electroslag, Ti-containing steel carries out the recovery electroslag after electroslag remelting.
(3) starting the arc slag making: using Ti-containing steel 0Cr18Ni10Ti as consutrode, assemble electroslag refining furnace, the river bottom protection plate rustless steel 0Cr18Ni10Ti material of electroslag refining furnace crystallizer, adopt the energising starting the arc, it is initially charged new remelting slag in the crystallizer of described electroslag refining furnace, in new remelting slag, add 230g aluminium powder when the starting the arc and 140g titanium-iron powder carries out pre-deoxidation, add after described new remelting slag, aluminium powder and titanium-iron powder melt and return slag, set up slag bath；The gross weight of described return slag and new remelting slag is 30 kilograms, wherein returns 70 parts namely 21 kilograms that slag is gross weight, and new remelting slag is 30 parts namely 9 kilograms of gross weight.
(4) normal smelting: the new remelting slag of step (3) and return slag regulate electric current 6700～7000A, voltage 50～53V and carry out the melting of consutrode, pass into argon flow velocity 3L/min in fusion process after being completely melt.
(5) fill feeding: after step (4) consumable electrode melting completes, adopt classification small area analysis method that the titaniferous steel ingot obtained is carried out feeding, prior to feeding under 4000A 4 minutes, feeding 3 minutes under 2500A, finally feeding 2 minutes under 1000A.
Prepared steel ingot carries out titaniferous amount detection, and result is as shown in table 1 below, adopts the Ti-containing steel Ti content that the inventive method electroslag remelting obtains all qualified as can be seen from Table 1, and the present embodiment is protected titanium rate and reached more than 64%, and titanium deviation is within 1%.
Table 1 embodiment 1 titaniferous amount testing result
| 1# | Ti% | 2# | Ti% |
| The head of ingot | 0.425 | The head of ingot | 0.427 |
| Ingot body | 0.421 | Ingot body | 0.423 |
| Ingot tail | 0.416 | Ingot tail | 0.417 |
Embodiment 2
In a kind of Ti-containing steel electroslag remelting, application returns the method that slag protects titanium, comprises the steps:
(1) electrode prepares: adopting induction furnace to smelt 0Cr18Ni10Ti and pour into a mould ∮ 180mm electrode bar, adopt water-cooled copper crystallizer, crystallizer diameter is ∮ 320mm.
(2) slag charge prepares: new remelting slag includes the component of following weight portion: 30 parts of CaF2, 40 parts of Al2O3, 20 parts of CaO, 5 parts of MgO and 5 parts of TiO2, new remelting slag is toasted 7 hours in 600～700 DEG C；Return slag is crushed to granularity≤5mm, toasts 2 hours through 300～400 DEG C；Returning slag is adopt described new remelting slag, as electroslag, Ti-containing steel carries out the recovery electroslag after electroslag remelting.
(3) starting the arc slag making: using Ti-containing steel 0Cr18Ni10Ti as consutrode, assemble electroslag refining furnace, the river bottom protection plate rustless steel 0Cr18Ni10Ti material of electroslag refining furnace crystallizer, adopt the energising starting the arc, it is initially charged new remelting slag in the crystallizer of described electroslag refining furnace, and addition 150g aluminium powder and 90g titanium-iron powder carry out pre-deoxidation in new remelting slag, add after described new remelting slag, aluminium powder and titanium-iron powder melt and return slag, set up slag bath；The gross weight of described return slag and new remelting slag is 30 kilograms, and wherein return slag is 80 parts of gross weight, and namely 24 kilograms, new remelting slag is 20 parts of gross weight, namely 6 kilograms.
(4) normal smelting: the new remelting slag of step (3) and return slag regulate electric current 6700～7000A, voltage 50～53V and carry out the melting of consutrode, pass into argon flow velocity 3L/min in fusion process after being completely melt.
(5) fill feeding: after step (4) consumable electrode melting completes, adopt classification small area analysis method that the titaniferous steel ingot obtained is carried out feeding, prior to feeding under 4000A 4 minutes, feeding 3 minutes under 2500A, finally feeding 2 minutes under 1000A.
Prepared steel ingot carries out titaniferous amount detection, and result is as shown in table 2 below, adopts the Ti-containing steel Ti content that the inventive method electroslag remelting obtains all qualified as can be seen from Table 2, and the present embodiment is protected titanium rate and reached more than 63%, and titanium deviation is within 1%.
Table 2 embodiment 2 titaniferous amount testing result
| 1# | Ti% | 2# | Ti% |
| The head of ingot | 0.423 | The head of ingot | 0.425 |
| Ingot body | 0.420 | Ingot body | 0.422 |
| Ingot tail | 0.413 | Ingot tail | 0.416 |
Embodiment 3
(1) electrode prepares: adopting induction furnace to smelt 0Cr18Ni10Ti and pour into a mould ∮ 180mm electrode bar, adopt water-cooled copper crystallizer, crystallizer diameter is ∮ 320mm.
(2) slag charge prepares: new remelting slag includes the component of following weight portion: 23 parts of CaF2, 40 parts of Al2O3, 25 parts of CaO, 3 parts of MgO and 6 parts of TiO2, new remelting slag is toasted 8 hours in 600～700 DEG C；Return slag is crushed to granularity≤5mm, toasts 2 hours through 300～400 DEG C；Returning slag is adopt described new remelting slag, as electroslag, Ti-containing steel carries out the recovery electroslag after electroslag remelting.
(3) starting the arc slag making: using Ti-containing steel 0Cr18Ni10Ti as consutrode, assemble electroslag refining furnace, the river bottom protection plate rustless steel 0Cr18Ni10Ti material of electroslag refining furnace crystallizer, adopt the energising starting the arc, it is initially charged new remelting slag in the crystallizer of described electroslag refining furnace, and addition 290g aluminium powder and 180g titanium-iron powder carry out pre-deoxidation in new remelting slag, add after described new remelting slag, aluminium powder and titanium-iron powder melt and return slag, set up slag bath；The gross weight of described return slag and new remelting slag is 30 kilograms, and wherein return slag is 60 parts of gross weight, and namely 18 kilograms, new remelting slag is 40 parts of gross weight, namely 12 kilograms.
(4) normal smelting: the new remelting slag of step (3) and return slag regulate electric current 6700～7000A, voltage 50～53V and carry out the melting of consutrode after being completely melt, fusion process passes into argon flow velocity 3L/min.
(5) fill feeding: after step (4) consumable electrode melting completes, adopt classification small area analysis method that the titaniferous steel ingot obtained is carried out feeding, prior to feeding under 4000A 4 minutes, feeding 3 minutes under 2500A, finally feeding 2 minutes under 1000A.
Prepared steel ingot carries out titaniferous amount detection, and result is as shown in table 3 below, adopts the Ti-containing steel Ti content that the inventive method electroslag remelting obtains all qualified as can be seen from Table 3, and the present embodiment is protected titanium rate and reached more than 63%, and titanium deviation is within 1%.
Table 3 embodiment 3 titaniferous amount testing result
| 1# | Ti% | 2# | Ti% |
| The head of ingot | 0.426 | The head of ingot | 0.425 |
| Ingot body | 0.422 | Ingot body | 0.421 |
| Ingot tail | 0.419 | Ingot tail | 0.416 |
Embodiment 4
The present invention returns to slag access times≤3 time and is advisable, and when returning slag access times more than more than 3 times, defective situation occurs in the Ti content of Ti-containing steel, and concrete condition is shown in Table 4.
Table 4 returns the different impact on Ti content of slag access times
| Number of times | The head of ingot | Ingot body | Ingot tail |
| 1 | 0.414 | 0.423 | 0.425 |
| 2 | 0.421 | 0.422 | 0.421 |
| 3 | 0.416 | 0.420 | 0.424 |
| 4 | 0.392 | 0.402 | 0.409 |
| 5 | 0.411 | 0.397 | 0.406 |
Comparative example 1
Difference from Example 1 is only that, the gross weight number of described return slag and new remelting slag is 100 parts, wherein returns slag < 20 parts, and all the other are new remelting slag.Prepared steel ingot is carried out titaniferous amount detection, result is as shown in table 5 below, adopt the Ti-containing steel Ti content that comparative example method electroslag remelting obtains to have defective (Ti >=0.4% is for qualified) as can be seen from Table 5, and be 4.9% with a maximum titanium deviation of steel ingot.
Table 5 comparative example 1 titaniferous amount testing result
| 1# | Ti% | 2# | Ti% |
| The head of ingot | 0.426 | The head of ingot | 0.435 |
| Ingot body | 0.399 | Ingot body | 0.411 |
| Ingot tail | 0.377 | Ingot tail | 0.392 |
Comparative example 2
Difference from Example 1 is only that, the gross weight number of described return slag and new remelting slag is 100 parts, wherein returns slag > 40 parts, and all the other are new remelting slag.Prepared steel ingot is carried out titaniferous amount detection, result is as shown in table 6 below, adopt the Ti-containing steel Ti content that comparative example method electroslag remelting obtains to have underproof (Ti >=0.4% is for qualified) as can be seen from Table 6, and be 3.4% with a maximum titanium deviation of steel ingot.
Table 6 comparative example 2 titaniferous amount testing result
| 1# | Ti% | 2# | Ti% |
| The head of ingot | 0.418 | The head of ingot | 0.427 |
| Ingot body | 0.401 | Ingot body | 0.393 |
| Ingot tail | 0.385 | Ingot tail | 0.402 |
By comparative example it can be seen that when use return slag content too much or very few time, the content of titanium all can have underproof, and Ti content skewness；Only account for 60～80 parts when the employing present invention returns slag, just can obtain Ti content when surplus is new remelting slag qualified, the titaniferous steel ingot that titanium is evenly distributed, it can be seen that the inventive method achieves the technique effect of excellence.
By comparative example it can be seen that when the return slag access times used are within 3 times, the content of titanium all can have underproof, and Ti content skewness；Only just can obtain Ti content when the access times of return slag are within 3 times qualified, the titaniferous steel ingot that titanium is evenly distributed, it can be seen that the inventive method achieves the technique effect of excellence.
What finally illustrate is, above example is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail with reference to preferred embodiment, it will be understood by those within the art that, technical scheme can be modified or equivalent replacement, without deviating from objective and the scope of technical solution of the present invention, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (9)
1. in a Ti-containing steel electroslag remelting, application returns the method that slag protects titanium, adopt electroslag remelting process, using Ti-containing steel as consutrode, it is characterized in that, adopt and return slag and new remelting slag as electroslag, described return slag is the recovery electroslag after Ti-containing steel carries out electroslag remelting, suppresses the titanium elements in Ti-containing steel and the TiO in electroslag in reflow process2React and be burnt, reach to protect titanium purpose.
2. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 1, it is characterised in that described new remelting slag includes the component of following weight portion: 20 ~ 30 parts of CaF2, 30 ~ 40 parts of Al2O3, 20 ~ 30 parts of CaO, 3 ~ 6 parts of MgO and 3 ~ 6 parts of TiO2。
3. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 1, it is characterised in that described return slag is adopt described new remelting slag, as electroslag, Ti-containing steel carries out the recovery electroslag after electroslag remelting.
4. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 1, it is characterised in that the gross weight number of described electroslag is 100 parts, wherein, returns slag and accounts for 60 ~ 80 parts, and brand-new remelting slag accounts for 20～40 parts.
5. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 1, it is characterised in that specifically include following steps:
1) slag charge prepares: is crushed by described return slag and toasts 2 ~ 3 hours in 300 ~ 400 DEG C, is toasted 7 ~ 9 hours in 600 ~ 700 DEG C by described new remelting slag；
2) starting the arc slag making: using Ti-containing steel as consutrode, assemble electroslag refining furnace, the energising starting the arc, it is initially charged new remelting slag in the crystallizer of described electroslag refining furnace, and addition aluminium powder and titanium-iron powder carry out pre-deoxidation in new remelting slag, after described new remelting slag, aluminium powder and titanium-iron powder melt, add return slag, set up slag bath；Wherein, the mass ratio of described aluminium powder, titanium-iron powder and new remelting slag is 2 ~ 3:1 ~ 2:100；
3) melting: step 2) described new remelting slag and after returning slag fusing, regulate electric current 6700～7000A, voltage 50～53V and carry out the melting of consutrode, fusion process passes into inert protective gas.
6. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 5, it is characterized in that, also include step 4) and fill feeding: after step 3) consumable electrode melting completes, adopt classification small area analysis method that the titaniferous steel ingot obtained is carried out feeding, prior to feeding under 4000 ~ 4300A 4 ~ 6 minutes, feeding 2 ~ 4 minutes under 2500 ~ 2800A, finally feeding 1 ~ 2 minute under 1000 ~ 1200A.
7. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 5, it is characterised in that in step 1), return slag is crushed to granularity≤5mm.
8. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 5, it is characterised in that described Ti-containing steel is 0Cr18Ni10Ti steel alloy.
9. application returns the method that slag protects titanium in Ti-containing steel electroslag remelting according to claim 5, it is characterised in that the river bottom protection plate of described crystallizer is identical with Ti-containing steel steel grade.
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| CN110983064A (en) * | 2019-12-24 | 2020-04-10 | 北京首钢吉泰安新材料有限公司 | Method and equipment for improving surface quality of titanium-containing electroslag steel ingot |
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| CN110983064B (en) * | 2019-12-24 | 2021-10-12 | 北京首钢吉泰安新材料有限公司 | Method and equipment for improving surface quality of titanium-containing electroslag steel ingot |
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