CN108676961A - A kind of vacuum induction melting fast denitrogenation method - Google Patents
A kind of vacuum induction melting fast denitrogenation method Download PDFInfo
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- CN108676961A CN108676961A CN201810594632.3A CN201810594632A CN108676961A CN 108676961 A CN108676961 A CN 108676961A CN 201810594632 A CN201810594632 A CN 201810594632A CN 108676961 A CN108676961 A CN 108676961A
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- vacuum induction
- induction melting
- crucible
- melting
- leak rate
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of method of vacuum induction melting fast denitrogenation, advantageous effects of the invention are：70% or more N content removal efficiency in high performance alloys can be achieved, minimum reachable 10ppm hereinafter, and increased smelting time no more than 60min, it is small to the corrosive effect of furnace lining.
Description
Technical field
The invention belongs to extraordinary field of metallurgy, and in particular to special steel and high performance alloys (corrosion resistant alloy, high temperature alloy)
Denitrification process.
Background technology
High performance alloys refer mainly to the high-strength steel for purposes such as aerospace, nuclear power, derived energy chemicals, high-temperature corrosion-resistant alloy
Deng usually using Ti, Al, Nb etc. as precipitation strength element to improve military service performance.And the affinity of N and Ti, Al, Nb are big, easily
It forms TiN, AlN, NbN etc. to be mingled with, these field trash hardness are big, fusing point is high, in irregular shape, even if the remelting process in rear road
Also be difficult to remove, thus high performance alloys the control of N content is required in vacuum induction melting it is very strict.
There are mainly two types of the methods for controlling N content in industrial production at present, selects the raw material of ultralow N, and/or use vacuum
The long-time more than 6 hours is stood down.Both methods is the raw material and manufacturing cost for significantly improving material less than one, two
It is to stand that resistance to material lining wear is caused to aggravate for a long time, so that oxide is mingled with and increase with slag inclusion quantity, under material purity level
Drop, third, N content fall is limited, N content is difficult horizontal less than 15ppm.
CN107190158A is mentioned to be stood by C-O reaction bonded vacuum, can effectively take off N.But since high-performance is closed
The C content of gold requires generally 0.1% hereinafter, the accurate difficulty of matching of C, O are larger, therefore number of bubbles is limited.
CN106868345A, which mentions refining using superhigh temperature, takes off N, but superhigh temperature operation can cause lining wear to aggravate, field trash and slag inclusion
Quantity increases.CN105238934A and CN106222460B, which is mentioned, to be added Nb, Al, Ti etc. and N in the melting later stage and has stronger parent
With the element of power, this is industrial common practice, but and it is not yet in effect solve the problems, such as early period abjection body material in N.
It is ventilative that CN102703794B, CN102719686B and CN103114172A mention assembly one among vacuum induction furnace bottom
Brick, and the method for generating bubble denitrogenation by argon bottom-blowing, this method are that a kind of cost is controllable and do not generate side effect (stove substantially
Lining corrodes) denitrogenation method, but exist 2 points it is insufficient, first, since vacuum induction melting molten bath is from intermediate downward, then by bottom
The position of the characteristics of both sides flow up, air brick is placed on the intermediate effective floating that can inhibit argon gas bubbles, and influences to take off N effects
Fruit；Second is that according to the specific rule in Xihua, the solubility of N is also related with vacuum degree, vacuum degree the releasing due to O in smelting period and refining period
It puts, working vacuum degree can be decreased obviously, therefore first take the O content in effective means reduction molten bath.
Invention content
The purpose of the present invention seeks to solve the above problem of the existing technology, and it is controllable and effective to provide a kind of cost
High performance alloys vacuum induction melting quickly take off N methods.
Technical scheme is as follows：A kind of method of vacuum induction melting fast denitrogenation, includes the following steps：
Step 1：According to vacuum induction melting molten bath from it is intermediate downwards, then the characteristics of flowed up by two bottom sides, at crucible bottom
An air brick is respectively configured at 1/2 radius of portion both sides, and is led to argon gas before addition and checked whether air brick is normal；
Step 2：Before melting, according to the oxygen content in body material sheet nickel, ingot iron medium carbon ferrochrome, according to C/O mass
Than 0.5:1-2:The 1 corresponding carbon dust of supplying is placed in bottom in crucible；
Step 3：Bell is closed, is vacuumized in stove and reaches setting value；
Step 4：Be powered fusing；
Step 5：After raw material is all melting down, argon bottom-blowing is opened until weld pool surface has bubble to escape out, continuous Argon
30-60min；
Step 6：Enter refining period after Argon, refining period is judged according to dynamic leak rate, when dynamic leak rate twice in succession
Difference be no more than 5% when, refining terminates, be added ferro-niobium, return material, and the phase III be added Ai, Ti, denitrification process complete.
The present invention advantageous effects be：Can be achieved high performance alloys in 70% or more N content removal efficiency, it is minimum can
Up to 10ppm hereinafter, and increased smelting time be no more than 60min, it is small to the corrosive effect of furnace lining.
Description of the drawings
Fig. 1 be bottom carry both sides two gas supply bricks vacuum induction melting crucible schematic diagram, wherein 1 be the furnace lining of resistance to material, 2
It is bottom air brick for molten bath, 3,4 be bubble.
Specific implementation mode
Embodiment 1
Argon gas switch is opened, checks whether two air bricks of crucible bottom are normal, as abnormal, replaces melting preparation stage, root
It is estimated according to oxygen contents such as body material sheet nickel, ingot iron, medium carbon ferrochromes, carbon is incorporated according to the ratio of mass fraction 50%
Powder is placed in crucible bottom.Bell is closed, starts to vacuumize until Absolute truth reciprocal of duty cycle reaches about 10-2Pa, and static leak rate is not
More than 300Pa.L/s, it need to hunt leak and handle Ru abnormal.Be powered fusing, and sufficient reaction between carbon and oxygen helps to remove a part of N.
After furnace charge is all melting down, opens argon bottom-blowing and switch and adjust flow or pressure, observe that weld pool surface has bubble obviously to escape
Subject to, time 30min.After bottom blowing every 5min into Mobile state leak rate detect, when the adjacent leak rate of dynamic twice it
Refining period terminates when difference is no more than 5%.Ferro-niobium, return material etc. is added by mending feed compartment, and enters Al, Ti etc. in the phase III.
The operations such as carry on desulfurization, remove slag.It is poured into a mould.Through aforesaid operations, the N content of GH4169 is dropped to from initial 60ppm
The 12ppm of finished ingot.
Embodiment 2
Argon gas switch is opened, checks whether two air bricks of crucible bottom are normal, as abnormal, replaces.
The melting preparation stage is estimated according to oxygen contents such as body material ingot iron, sheet nickel, ferrosilicon, according to quality
The ratio of score 150% is incorporated corresponding carbon dust and is placed in crucible bottom.Bell is closed, starts to vacuumize until Absolute truth reciprocal of duty cycle
Reach about 10-2Pa, and static leak rate is no more than 300Pa.L/s, need to hunt leak and handle Ru abnormal.Be powered fusing, adequately
Reaction between carbon and oxygen helps to remove a part of N.After furnace charge is all melting down, opens argon bottom-blowing and switch and adjust flow or pressure, sight
Observing weld pool surface has subject to bubble obviously escapes, time 60min.Enter refining period after bottom blowing, is checked every 5min
Primary dynamic leak rate, when the difference of the adjacent leak rate of dynamic twice is no more than 5% refining period terminate.It is added by mending feed compartment
Cr, V, return material etc..The operations such as carry on desulfurization, remove slag.It is poured into a mould.Through aforesaid operations, the N content of 300M is from initial
40ppm drops to the 5ppm of finished ingot.
Claims (4)
1. a kind of method of vacuum induction melting fast denitrogenation, includes the following steps：
Step 1：Two air bricks are set at 1/2 radius of vaccum sensitive stove crucible outer bottom；
Step 2：Before melting, is estimated, pressed according to the oxygen content in body material sheet nickel, ingot iron medium carbon ferrochrome
It is incorporated corresponding carbon dust according to certain proportion and is placed in bottom in crucible；
Step 3：Bell is closed, is vacuumized in stove and reaches setting value；
Step 4：Be powered fusing；
Step 5：Judge melting process according to vacuum degree and dynamic leak rate, after raw material is melting down, opens argon bottom-blowing until molten
Until pool surface has bubble effusion；
Step 6：Judge refining period according to dynamic leak rate, refining period is complete when the difference of dynamic leak rate is no more than 5% twice in succession
At, add later ferro-niobium, return material, and the phase III be added Ai, Ti, denitrification process complete.
2. the method for vacuum induction melting fast denitrogenation according to claim 1, it is characterised in that basis in step 2
Oxygen content in furnace charge, according to C/O mass fractions 0.5:1-2:1 ratio is incorporated corresponding carbon dust, and carbon dust is laid on crucible most bottom
Portion.
3. the addition sequence of the method for vacuum induction melting fast denitrogenation according to claim 1, alloy raw material is not
Deoxidation and the initial feed Ni plate small with N affinity, technical pure Fe, MoFe, add metal Nb, NbFe, then after refining period
Add Al, Ti.
4. a kind of vacuum induction melting crucible for any one of claim 1-3 claim, feature
Symmetrical two blocks of air bricks are equipped at 1/2 radius of crucible outer bottom.
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| CN201810594632.3A CN108676961B (en) | 2018-06-11 | 2018-06-11 | Vacuum induction furnace smelting rapid denitrification method |
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| CN201810594632.3A CN108676961B (en) | 2018-06-11 | 2018-06-11 | Vacuum induction furnace smelting rapid denitrification method |
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| CN108676961A true CN108676961A (en) | 2018-10-19 |
| CN108676961B CN108676961B (en) | 2020-07-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5322543A (en) * | 1993-02-04 | 1994-06-21 | Lazcano Navarro Arturo | Simplified method for producing ductile iron |
| CN2384710Y (en) * | 1999-08-10 | 2000-06-28 | 石家庄钢铁有限责任公司 | Refining bottom argon-blown steel ladle |
| CN102212652A (en) * | 2011-05-17 | 2011-10-12 | 武汉钢铁(集团)公司 | Rapid degassing method of vacuum induction furnace |
| CN102274957A (en) * | 2011-08-05 | 2011-12-14 | 莱芜钢铁集团有限公司 | Steel ladle |
| CN102719686A (en) * | 2012-06-29 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Method for smelting nickel-based high temperature alloy in vacuum induction furnace |
| CN106222460A (en) * | 2016-08-30 | 2016-12-14 | 西部超导材料科技股份有限公司 | A kind of nickel base superalloy vacuum induction melting method |
-
2018
- 2018-06-11 CN CN201810594632.3A patent/CN108676961B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5322543A (en) * | 1993-02-04 | 1994-06-21 | Lazcano Navarro Arturo | Simplified method for producing ductile iron |
| CN2384710Y (en) * | 1999-08-10 | 2000-06-28 | 石家庄钢铁有限责任公司 | Refining bottom argon-blown steel ladle |
| CN102212652A (en) * | 2011-05-17 | 2011-10-12 | 武汉钢铁(集团)公司 | Rapid degassing method of vacuum induction furnace |
| CN102274957A (en) * | 2011-08-05 | 2011-12-14 | 莱芜钢铁集团有限公司 | Steel ladle |
| CN102719686A (en) * | 2012-06-29 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Method for smelting nickel-based high temperature alloy in vacuum induction furnace |
| CN106222460A (en) * | 2016-08-30 | 2016-12-14 | 西部超导材料科技股份有限公司 | A kind of nickel base superalloy vacuum induction melting method |
Non-Patent Citations (2)
| Title |
|---|
| 余强 等: "多功能真空感应炉的开发", 《材料与冶金学报》 * |
| 曲英: "《炼钢学原理》", 31 December 1980, 冶金工业出版社 * |
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