CN104131172A - Electroslag remelting technology for improving surface quality of Ti-containing nickel-based high-temperature alloy - Google Patents
Electroslag remelting technology for improving surface quality of Ti-containing nickel-based high-temperature alloy Download PDFInfo
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- CN104131172A CN104131172A CN201410343456.8A CN201410343456A CN104131172A CN 104131172 A CN104131172 A CN 104131172A CN 201410343456 A CN201410343456 A CN 201410343456A CN 104131172 A CN104131172 A CN 104131172A
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Abstract
The invention discloses an electroslag remelting technology for improving surface quality of a Ti-containing nickel-based high-temperature alloy. The electroslag remelting technology is characterized in that an ingot withdrawing-type electroslag furnace is adopted, the used slag comprises Ti-containing alloy slag obtained by conventional smelting and also comprises, based on Ti-containing alloy slag weight, 5-10wt% of SiO2, an original electrode of the electroslag furnace contains less than or equal to 0.2wt% of Al and 0.6-1.2wt% of Ti, and in electroslag remelting, aluminum granules are used for deoxidation so that unstable oxide SiO2 in the slag and aluminum undergo a reaction so that aluminum burning and titanium retaining are realized. Through use of SiO2 in the slag, the slag has a certain high temperature plasticity and lubrication performances and steel ingot surface quality is effectively improved so that a bright and clean steel ingot surface is obtained. Through increasing of aluminum content of a smelting electrode and use of the aluminum granules in remelting, unstable oxide SiO2 in the slag and aluminum undergo a reaction so that aluminum burning and titanium retaining are realized. The electroslag remelting technology effectively improves surface quality of an alloy 825, effectively guarantees qualified Ti content of the alloy, realizes bright and clean steel ingot surface quality and qualified components and internal quality and obviously improves a yield.
Description
Technical field
The present invention relates to a kind of alloy electroslag remelting process, especially a kind of raising is containing the electroslag remelting process of the nickel base superalloy surface quality of Ti.
Background technology
For example, containing the nickel base superalloy of Ti, nickel base superalloy 825(825 alloy), owing to containing Ni and Ti, during esr, surface quality is conventionally poor, is mainly because need to add a small amount of TiO in the poor thermal conductivity of steel and remelting slag
2reduce the scaling loss of Ti, TiO
2can make slag become sticky, worsen Ingot Surface Quality.
The traditional fixed electroslag furnace of general employing is produced superalloy, and lumber recovery is lower, uses stripping formula electroslag furnace can produce longer ESR ingot, has greatly improved lumber recovery.But stripping formula electroslag furnace requires slag to have certain high-temp plastic and lubricity to improve Ingot Surface Quality, adds a small amount of SiO in slag
2, can improve the high-temp plastic of slag, make ingot casting any surface finish.But the SiO in slag
2be unstable oxide, can cause the scaling loss of Ti in steel, so will purify to reduce SiO in slag to slag when traditional esr contains Ti steel
2foreign matter content.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of raising containing the electroslag remelting process of the nickel base superalloy surface quality of Ti, qualified can guarantee the Ti content in nickel base superalloy, can obviously improve surface quality again.
For solving the problems of the technologies described above, the technical solution used in the present invention is: it adopts stripping formula electroslag furnace, and the slag charge of employing is to smelt containing the SiO that adds 5～10wt% on the basis of Ti alloy slag charge in routine
2; Al≤0.2wt%, Ti 0.6～1.2wt% in the Electrode for remelting of described electroslag furnace; In described esr process, add aluminum shot and carry out deoxidation, make the unstable oxide SiO in slag charge
2burn aluminium with reactive aluminum and protect titanium.
The addition manner of aluminum shot of the present invention is: utilize furnace top bin to add aluminum shot continuously or in batches in electroslag furnace, addition is 200～300g/min ﹒ t; And in stokehold, add in batches aluminum shot, addition is 200～400g/t.
The molten speed of esr of the present invention is 700～800kg/h.
The weight proportion of slag charge of the present invention is: CaF
250～60%, CaO 10～20%, Al
2o
320～30%, TiO
20～5% and SiO
25～10%.
The beneficial effect that adopts technique scheme to produce is: the present invention by adding appropriate SiO in slag charge
2, make the slag of stripping formula electroslag furnace there is certain high-temp plastic and lubricity, thereby can effectively improve Ingot Surface Quality, make ingot casting any surface finish.The present invention is by increase Al content in Electrode for remelting, and in reflow process, the continuous aluminum shot that adds carries out deoxidation, makes the unstable oxide SiO in slag
2to reach, burn the object that aluminium is protected titanium with reactive aluminum.The present invention is effectively improving containing in the nickel base superalloy surface quality of Ti, can effectively guarantee that in alloy, Ti content is qualified, make that ESR ingot surface quality is bright and clean, composition and internal soundness qualified, lumber recovery is improved significantly, and is particularly useful for the production of 825 superalloys.
The present invention will be melted speed and will be promoted to 700～800kg/h by 500～600kg/h, can make slag temperature raise, and improve the mobility of slag, improve the lubricant effect of slag to steel ingot, thereby the more effective lifting of energy is containing the surface quality of the nickel base superalloy ESR ingot of Ti.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is melting curves figure of the present invention;
Fig. 2 is the surface quality figure of former technique gained 825 alloys;
Fig. 3 is the surface quality figure of gained 825 alloys of the present invention.
Embodiment
This raising adopts following processing step containing the electroslag remelting process of the nickel base superalloy surface quality of Ti:
(1) take that to adopt 825 superalloys that stripping formula electroslag remelting furnace production specification is 325mm * 280mm * 6000mm be example.The standard chemical composition of 825 superalloys is in Table 1, the liquidus temperature of 825 alloys is 1370 ℃～1400 ℃, the fusing point of slag should be lower 100～200 ℃ than the fusing point of steel, the electroslag furnace of stripping formula in addition requires slag to have certain high-temp plastic and lubricity, during throwing to base shell play support and lubrication with assurance surface quality, and in slag, add a small amount of SiO
2, can reduce the fusing point of slag, improve the high-temp plastic of slag, make ingot casting any surface finish, therefore on smelting the basis of 825 superalloy slag systems, tradition adds the SiO of 5～10wt%
2, slag proportioning is in Table 2, and the use quantity of slag that the total quantity of slag 200～220kg(of every stove converts molten steel per ton is 50～55kg/t).
The standard chemical composition of table 1:825 alloy
Table 2: slag charge proportioning
(2) owing to adding SiO in slag
2after can increase the scaling loss of Ti, as shown in reaction formula (1), so improve Al in original electrode, Ti content to Ti 0.6～1.2wt%, Al≤0.2wt%; And in reflow process, constantly add aluminum shot and carry out deoxidation, make the unstable oxide SiO in slag
2to reach, burn the object that aluminium is protected titanium with reactive aluminum, reaction formula is as shown in (2).The addition manner of described aluminum shot is: the automatic add-on of furnace top bin aluminum shot is steel 200～300g/min per ton; The artificial short run in stokehold is added aluminum shot in addition, and addition is 200～400g/t, and concrete addition manner is for to add 20～50g aluminum shot at interval of 10min.
SiO
2+Ti=TiO
2+Si （1）
3SiO
2+4Al=3Si+2Al
2O
3 （2）
(3) while using the ESR ingot that stripping formula electroslag furnace production specification is 325mm * 280mm, general melting speed control is at 500～600kg/h, owing to improving molten speed, can make slag temperature raise, improve the mobility of slag, improve the lubricant effect of slag to steel ingot, so will melt speed while smelting 825 alloy, bring up to 700～800kg/h.Melting curves is shown in Fig. 1, and in curve, beginning is for changing slag curve, and aft section is melting curves.
Embodiment 1: the concrete steps of this electroslag remelting process are as described below.
Slag charge weight proportion: CaF
250%, CaO 10%, Al
2o
330%, TiO
25%, SiO
25%; Total quantity of slag 220kg.The chemical composition of Electrode for remelting is in Table 3; In reflow process, the automatic add-on of furnace top bin aluminum shot is 200g/min ﹒ t, and the artificial short run in stokehold is added aluminum shot in addition, and addition is 200g/t.Melting speed control is at 700～720kg/h.
Table 3: electrode chemical composition
Fig. 2 is that general stripping formula electroslag furnace is used slag charge (the remaining SiO in slag charge after purifying
2≤ 3%), under the processing condition that are 500～600kg/h in molten speed, 825 alloy ESR ingot surface quality of production; Fig. 3 is the surface quality of the present embodiment gained 825 alloy ESR ingot.From Fig. 2, Fig. 3, contrasted, the surface quality of the present embodiment gained 825 alloy ESR ingot has obtained very significantly improving.
The present embodiment gained 825 alloy ESR ingot internal soundnesses: use 3 825 ESR ingot of this explained hereafter, composition is all qualified, dummy ingot end and rising head end Ti composition deviation < 0.2%, in ESR ingot, easy scaling loss elemental composition is in Table 4.Macrostructure is fine and close, without macro defect.Do not find the defects such as white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing.Steel ingot has excellent thermoplasticity, at 1000 ℃, forges, and forging ratio is 6, and crackle does not appear in steel ingot.Steel ingot has excellent corrosion resistance nature, according to ASTM262 C method, carries out Huey test, and test average corrosion rate is the 0.01305mm/ month, and test-results, in Table 5, is carried out Huey test according to ASTM262 E method, does not find intergranular corrosion phenomenon.
Table 4: easy scaling loss elemental composition
Described ASTM262 C method is carried out Huey test method: 3 ESR ingot of test, after forging, sample respectively on forging, and sample size is 2cm * 2cm * 2cm, and density is 8.0g/cm
3, etching time is 720h, according to following formula (3), calculates corrosion rate:
Millimeter=(7290 * W)/(A * D * t) (3) monthly
In formula:
T=open-assembly time, h;
A=total surface area, cm
2;
D=sample density, g/cm
3;
W=loss in weight, g;
Calculation result is in Table 5.
Table 5: embodiment 1 Huey test result
Embodiment 2: the concrete steps of this electroslag remelting process are as described below.
Slag charge weight proportion: CaF
250%, CaO 12%, Al
2o
325%, TiO
23%, SiO
210%; Total quantity of slag 220kg.In Electrode for remelting, Al content is that 0.2wt%, Ti content are 1.2wt%; In reflow process, the automatic add-on of furnace top bin aluminum shot is 300g/min ﹒ t, and the artificial short run in stokehold is added aluminum shot in addition, and addition is 400g/t; Melting speed control is at 780～800kg/h.
The present embodiment gained 825 alloy ESR ingot internal soundnesses: after testing, its composition is qualified, dummy ingot end and rising head end Ti composition deviation are 0.19%; Macrostructure is fine and close, without macro defect; Do not find the defects such as white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing; At 1000 ℃, forge, forging ratio is that the forging cross-sectional dimension after 6(forges is 120mm * 120mm, can be write as " forging ratio >=6 " here), there is not crackle in steel ingot; According to ASTM262 C method, carry out Huey test, test average corrosion rate is the 0.01310mm/ month, according to ASTM262 E method, carries out Huey test, does not find intergranular corrosion phenomenon.
Embodiment 3: the concrete steps of this electroslag remelting process are as described below.
Slag charge weight proportion: CaF
260%, CaO 10%, Al
2o
320%, TiO
22%, SiO
28%; Total quantity of slag 220kg.In Electrode for remelting, Ti content is 0.9wt%; In reflow process, the automatic add-on of furnace top bin aluminum shot is 260g/min ﹒ t, and the artificial short run in stokehold is added aluminum shot in addition, and addition is 300g/t; Melting speed control is at 720～750kg/h.
The present embodiment gained 825 alloy ESR ingot internal soundnesses: after testing, its composition is qualified, dummy ingot end and rising head end Ti composition deviation are 0.18%; Macrostructure is fine and close, without macro defect; Do not find the defects such as white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing; At 1000 ℃, forge, forging ratio is 6, and crackle does not appear in steel ingot; According to ASTM262 C method, carry out Huey test, test average corrosion rate is the 0.01303mm/ month, according to ASTM262 E method, carries out Huey test, does not find intergranular corrosion phenomenon.
Embodiment 4: the concrete steps of this electroslag remelting process are as described below.
Slag charge weight proportion: CaF
252%, CaO 20%, Al
2o
320%, TiO
22%, SiO
26%; Total quantity of slag 220kg.In Electrode for remelting, Al content is that 0.1wt%, Ti content are 0.6wt%; In reflow process, the automatic add-on of furnace top bin aluminum shot is 220g/min ﹒ t, and the artificial short run in stokehold is added aluminum shot in addition, and addition is 250g/t; Melting speed control is at 740～760kg/h.
The present embodiment gained 825 alloy ESR ingot internal soundnesses: after testing, its composition is qualified, dummy ingot end and rising head end Ti composition deviation are 0.18%; Macrostructure is fine and close, without macro defect; Do not find the defects such as white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing; At 1000 ℃, forge, forging ratio is 6, and crackle does not appear in steel ingot; According to ASTM262 C method, carry out Huey test, test average corrosion rate is the 0.01312mm/ month, according to ASTM262 E method, carries out Huey test, does not find intergranular corrosion phenomenon.
Claims (4)
1. raising, containing an electroslag remelting process for the nickel base superalloy surface quality of Ti, is characterized in that: it adopts stripping formula electroslag furnace, and the slag charge of employing is to smelt containing the SiO that adds 5～10wt% on the basis of Ti alloy slag charge in routine
2; Al≤0.2wt%, Ti 0.6～1.2wt% in the Electrode for remelting of described electroslag furnace; In described esr process, add aluminum shot and carry out deoxidation, make the unstable oxide SiO in slag charge
2burn aluminium with reactive aluminum and protect titanium.
2. raising according to claim 1 is containing the electroslag remelting process of the nickel base superalloy surface quality of Ti, it is characterized in that, the addition manner of described aluminum shot is: utilize furnace top bin to add aluminum shot continuously or in batches in electroslag furnace, addition is 200～300g/min ﹒ t; And in stokehold, add in batches aluminum shot, addition is 200～400g/t.
3. raising according to claim 1, containing the electroslag remelting process of the nickel base superalloy surface quality of Ti, is characterized in that: the molten speed of described esr is 700～800kg/h.
4. the electroslag remelting process containing the nickel base superalloy surface quality of Ti according to the raising described in claim 1,2 or 3, is characterized in that, the weight proportion of described slag charge is: CaF
250～60%, CaO 10～20%, Al
2o
320～30%, TiO
20～5% and SiO
25～10%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282592A (en) * | 2015-05-26 | 2017-01-04 | 抚顺市晟隆金属制品有限公司 | High temperature alloy slag system proportioning and the selection technique of the quantity of slag |
| 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 |
| CN111440956A (en) * | 2019-12-12 | 2020-07-24 | 广东省钢铁研究所 | Electroslag remelting process method |
| CN112458303A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Low-carbon ultralow-titanium high-strength steel ultrapure smelting process |
-
2014
- 2014-07-18 CN CN201410343456.8A patent/CN104131172A/en active Pending
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| 付文逵: "《高等学校使用教材 钢铁冶炼工艺》", 31 January 1981, article "电渣重熔", pages: 254 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282592A (en) * | 2015-05-26 | 2017-01-04 | 抚顺市晟隆金属制品有限公司 | High temperature alloy slag system proportioning and the selection technique of the quantity of slag |
| CN111440956A (en) * | 2019-12-12 | 2020-07-24 | 广东省钢铁研究所 | Electroslag remelting process method |
| 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 |
| 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 |
| CN112458303A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Low-carbon ultralow-titanium high-strength steel ultrapure smelting process |
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