CN1257289C - Vacuum oxygen blowing decarbon refining furnace smelting stainless steel high carbon region denitrogen method - Google Patents
Vacuum oxygen blowing decarbon refining furnace smelting stainless steel high carbon region denitrogen method Download PDFInfo
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- CN1257289C CN1257289C CN 200410012108 CN200410012108A CN1257289C CN 1257289 C CN1257289 C CN 1257289C CN 200410012108 CN200410012108 CN 200410012108 CN 200410012108 A CN200410012108 A CN 200410012108A CN 1257289 C CN1257289 C CN 1257289C
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 124
- 239000001301 oxygen Substances 0.000 title claims abstract description 124
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 238000007670 refining Methods 0.000 title claims abstract description 89
- 238000003723 Smelting Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 37
- 239000010935 stainless steel Substances 0.000 title claims abstract description 34
- 238000007664 blowing Methods 0.000 title claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 73
- 239000010959 steel Substances 0.000 claims abstract description 73
- 229910052786 argon Inorganic materials 0.000 claims abstract description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 26
- 238000009835 boiling Methods 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 238000005261 decarburization Methods 0.000 claims description 99
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 10
- 239000004615 ingredient Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 6
- 239000010436 fluorite Substances 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000005262 decarbonization Methods 0.000 abstract 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 12
- 229910052804 chromium Inorganic materials 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The present invention relates to a high-carbon area denitrifying method for stainless steel smelting in a vacuum oxygen blowing decarbonization refining furnace, which comprises: molten stainless steel with a carbon content larger than or equal to 0.30% is poured into a vacuum oxygen blowing decarbonization refining furnace, the furnace pumped into vacuum, and argon gas is blown in; when the vacuum degree in the furnace reaches 150 to 200 torr, oxygen is blown into the furnace; then, silicon is removed, oxygen blowing is stopped, and argon blowing at the bottom is converted to the maximal degree; when the atmosphere in the furnace is decreased to be lower than or equal to 5 torr and boiling is kept for more than 8 minutes, nitrogen is removed under a boiling condition; then, oxygen blowing decarbonization is continued, the vacuum degree is increased, and when decarbonization satisfies the requirement, the vacuum degree is from 20 to 40 torr; oxygen blowing is stopped, the vacuum degree in the furnace is pumped to be lower than 5 torr, and argon gas is blown in again to make the molten steel boil for more than 8 minutes for deoxidizing decarbonization; boiling ends, the vacuum degree is lower than 10 torr, and argon blowing at the bottom is converted to the maximal degree; reducing material is added for reduction, and the vacuum is kept for more than 10 minutes; then, argon blowing is stopped, and nitrogen gas is blown in to break vacuum. The method reduces the nitrogen content in molten steel to be smaller than 100 ppm, and a vacuum oxygen blowing decarbonization refining furnace is little damaged.
Description
Technical field
The present invention relates to a kind of smelting stainless steel in vacuum oxygen decarburization refining furnace denitrogenation method, i.e. vacuum-oxygen decarbonizing smelting stainless steel denitrogenation method.
Background technology
Nitrogen is harmful element in titaniferous stainless steel and ferritic stainless steel, so in the smelting process of titaniferous stainless steel and ferritic stainless steel, the control nitrogen content is lower better, and nitrogen solubleness in stainless steel is very big, and nitrogen is the thick atom element simultaneously, removes very difficult.
After the invention of vacuum oxygen decarburization refining furnace smelting process, in the actual use of smelting stainless steel, the dark denitrification effect of traditional vacuum oxygen decarburization refining furnace is poor, be difficult to denitrogenation below 100ppm, in order to overcome this deficiency of vacuum oxygen decarburization refining furnace smelting process, and the advantage of maintenance vacuum oxygen decarburization refining furnace smelting process, the stainless steel smelter is developed improvement to the vacuum oxygen decarburization refining furnace smelting process both at home and abroad, the main method of successful Application has: improve the molten steel carbon content, reach the effect that reduces nitrogen by prolonging tap to tap time, though it is effective to denitrogenation, but production efficiency is very low, and splash is serious in the smelting process, and is very big to structure deteriorate, so this vacuum oxygen smelting process can not get promoting; Another kind is that SS-VOD is the strong mixing vacuum oxygen decarburization refining furnace, and this method is that the amount that strengthens argon bottom-blowing reaches 0.01-0.02Nm
3/ min.t, though this smelting process denitrification effect is fine, because BOTTOM ARGON BLOWING tolerance is very big, long-time high vacuum is smelted, the smelting process splash is also very serious; Also have a kind of vacuum oxygen decarburization refining furnace-PB denitrogenation method, this method is to be blown into iron scale from the vacuum oxygen decarburization refining furnace top to molten steel to come denitrogenation, and denitrogenation speed is very fast, but complex process, the cost height.
Summary of the invention
Existing smelting stainless steel in vacuum oxygen decarburization refining furnace denitrogenation method is serious to structure deteriorate in order to overcome, complex process, deficiency that cost is high, the invention provides a kind of smelting stainless steel in vacuum oxygen decarburization refining furnace denitrogenation method, this denitrogenation method technology is simple, splash is slight.
Technical scheme of the present invention is when smelting stainless steel in vacuum oxygen decarburization refining furnace, according to molten steel degassing principle, creation helps the technological factor of denitrogenation, adopt secondary vacuum boiling denitrogenation, deoxidation, decarburization at vacuum oxygen decarburization refining furnace, under the not serious situation of splash, according to different steel grades every stove smelting steel time is controlled in one hour to two hours, realizes the technology purpose of denitrogenation in the short period of time.Main inventive features is: under the condition of the thin slag of high carbon high-temp, high-carbon regions be carbon more than or equal to boiling denitrogenation in 0.30% o'clock, the low-carbon (LC) district is that carbon containing is less than secondary boiling deoxidation in 0.30% o'clock, decarburization in the molten steel, splash is light.Other vacuum oxygen decarburization refining furnace has only low-carbon (LC) district once seethe with excitement deoxidation, decarburization.
Smelting stainless steel in vacuum oxygen decarburization refining furnace method of the present invention is as follows to raw materials for metallurgy and equipment requirements:
(1) the stainless molten steel nitrogen content of vacuum oxygen decarburization refining furnace is not more than 500ppm, and carbon content is more than or equal to 0.30%;
(2) liquid steel temperature is not less than 1590 ℃ before the processing of vacuum oxygen decarburization refining furnace, the thick 40mm that is not more than of slag, the slag liquid level of vacuum oxygen decarburization refining furnace ladle is not less than 1250mm to Bao Bi upper edge distance, according to concrete vacuum oxygen decarburization refining furnace equipment, adjusts this required distance.
Smelting stainless steel in vacuum oxygen decarburization refining furnace method of the present invention comprises the step of following order:
(1) stainless molten steel before handling is poured in the vacuum oxygen decarburization refining furnace ladle, vacuumize, bottom from vacuum oxygen decarburization refining furnace is blown into argon gas simultaneously, when making the interior vacuum tightness of vacuum oxygen decarburization refining furnace stove reach 150-200Torr, and beginning oxygen blast in ladle;
(2) blowing oxygen quantity m
3=0.8 * molten steel weight (kg) * molten steel contains Si percentage composition+30 and carries out desiliconization, stops oxygen blast, and BOTTOM ARGON BLOWING is reached maximum, general requirement is brought up to 4.3-3.6Torr to vacuum tightness simultaneously greater than 1000NL/min, and boiling is more than 8 minutes, carry out the denitrogenation of seething with excitement the first time, and decarburization;
(3) boiling finishes, and vacuum oxygen decarburization refining furnace continues oxygen decarburization, and gas clean-up reduces the stove internal gas pressure gradually simultaneously, and when target was arrived in decarburization, when promptly reaching stainless steel national standard or service requirements, vacuum tightness was at 20-40Torr;
(4) stop oxygen blast, the vacuum tightness in the vacuum oxygen decarburization refining furnace is extracted into below the 5Torr, be blown into argon gas from the vacuum oxygen decarburization refining furnace furnace bottom, make the stainless steel water boiling more than 8 minutes, ebullient carries out the deoxidation decarburization second time simultaneously;
(5) after boiling finishes, control vacuum tightness is below 10Torr, the argon bottom-blowing capacity of equipment of vacuum oxygen decarburization refining furnace to the greatest extent reaches maximum, add lime and fluorite, and the formula of deriving according to the chemical equation of Si reduction chromic oxide according to the chemical ingredients of molten steel at this moment calculates the ferrosilicon amount that adds, add ferrosilicon or aluminium, the part steel grade adds 80-150kg aluminium.Chromic oxide in the main reduced blast furnace of ferrosilicon or aluminium, its reduction reaction principle and calculation formula are as follows:
Siliceous 75% ferrosilicon calculated amount=1.67 * (be blown into total amount of oxygen m
3-0.933 * molten steel initial carbon content * molten steel initial weight kg-0.8 * molten steel initial silicon content * molten steel initial weight kg)+molten steel weight kg * product molten steel requirement silicone content ÷ 0.75
Keep vacuum time greater than 10 minutes.
(6) afterwards, turn off the vacuum oxygen decarburization refining furnace argon bottom-blowing, the top is blown into nitrogen and destroys vacuum.
(7) open vacuum cover, the composition of sample examination stainless steel water, when meeting the requirements, steel tapping casting, undesirable as composition, temperature, can arrive in other refining equipment of ladle refining furnace, smelting process is carried out refining routinely.
Smelting stainless steel in vacuum oxygen decarburization refining furnace denitrogenation method of the present invention, the carbon content of vacuum oxygen decarburization refining furnace being handled preceding stainless steel water requires to be controlled at more than 0.30%, after the oxygen blast desiliconization, carbon in molten steel, oxygen level, under the temperature conditions of higher, improved the activity quotient of nitrogen, stop oxygen blast, carry out the high vacuum boiling denitrogenation first time, the content of the nitrogen in the molten steel is reduced to below the 100ppm, simultaneously, little with the argon amount at carbon period, technology is simple, tap to tap time is short, splash is light, infringement to vacuum oxygen decarburization refining furnace equipment is little, has prolonged the work-ing life of vacuum oxygen decarburization refining furnace Splashproof cover.
Embodiment
Below by embodiment smelting stainless steel in vacuum oxygen decarburization refining furnace denitrogenation method of the present invention is elaborated.
Embodiment one
To the raw material smelted and smelting furnace require as follows:
Adopt double bogie type vacuum oxygen decarburization refining furnace stove, the volume of this stove is 75t, and freeboard is the slag liquid level to the distance of ladle wall upper edge is 1250mm.The stainless steel grade of smelting: 00Cr12Ti.
The actual (real) thickness 20mm of molten steel slag.75.1 tons of molten steel weight.
The chemical ingredients of molten steel is before handling:
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Nppm |
| 0.32 | 0.13 | 0.18 | 0.024 | 0.003 | 10.82 | 0.05 | 230 |
The temperature of molten steel is 1605 ℃ before handling.
The steps in sequence of present embodiment is as follows:
The time contents processing
Stainless molten steel was poured in the vacuum oxygen decarburization refining furnace ladle molten steel vacuum oxygen decarburization refining furnace working position into before 8:16 handled.
8:37 begins to vacuumize, from the bottom in the vacuum oxygen decarburization refining furnace stove Argon, argon flow amount 417NL/min, when the vacuum tightness in the vacuum oxygen decarburization refining furnace stove arrives 110.2Torr, oxygen blast in the vacuum oxygen decarburization refining furnace bag.
The 8:43 blowing oxygen quantity reaches 98m
3After the desiliconization, stop oxygen blast, begin to continue to vacuumize, vacuum tightness reaches 4.2Torr, is blown into peak flow 1174NL/min from the bottom argon gas, seethes with excitement 10 minutes, carries out seethe with excitement the first time denitrogenation and decarburization.
After the 8:55 boiling finishes, reduce vacuum tightness, begin to be blown into oxygen and continue decarburization to 110Torr.
9:35 oxygen blast process is gas clean-up progressively, is blown into total amount of oxygen 468m
3, vacuum tightness is at 37.4Torr, and oxygen decarburization finishes, and the argon gas that is blown into from the vacuum oxygen decarburization refining furnace bottom is 643NL/min, and gas clean-up was seethed with excitement 10 minutes to 4.4Torr, carried out the deoxidation decarburization of seething with excitement the second time.
The 9:45 boiling finishes, and turns off BOTTOM ARGON BLOWING, and the top is blown into nitrogen and destroys vacuum.Measuring the stainless molten steel temperature is 1599 ℃, sampling analysis stainless molten steel composition (analytical results is seen below).
9:48 begins to vacuumize.
When 9:54 vacuum tightness reaches 4.4Torr, be blown into argon gas from the bottom of vacuum oxygen decarburization refining furnace stove, add lime 1000Kg, fluorite 200kg, 75% ferrosilicon 518Kg, aluminium 148Kg reduction 10 minutes with the flow of 1148NL/min.
The sampling result of 10:08 9:45 analyze out for:
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Nppm |
| 0.01 | 0.24 | 0.20 | 0.024 | 0.002 | 10.08 | 0.03 | 58 |
Chromium component is on the low side, and adding low carbon ferrochromium 715Kg under the vacuum increases chromium content.
10:13 destroys vacuum in the oxygen decarburization refining furnace stove, and measuring the interior stainless molten steel temperature of ladle is 1564 ℃, and sample examination molten steel composition % is:
Reach service requirements.
| C | Si | Mn | P | S | Cr | Ni | Nppm |
| 0.01 | 0.24 | 0.21 | 0.024 | 0.002 | 11.44 | 0.03 | 64 |
The denitrogenation of 10:17 smelting stainless steel in vacuum oxygen decarburization refining furnace finishes.
The 10:25 ladle hangs ladle refining furnace stove position 70Fe-Ti line, increases Ti content in the steel.
After ladle refining furnace was handled, the chemical ingredients of Finished Steel was %
| C | Si | Mn | P | S | Cr | Ni | Ti | Nppm |
| 0.02 | 0.30 | 0.21 | 0.024 | 0.001 | 11.45 | 0.03 | 0.24 | 78 |
Embodiment two
To the raw material smelted and smelting furnace require as follows:
Adopt double bogie type vacuum oxygen decarburization refining furnace stove, the volume of this stove is 75t, and freeboard is the slag liquid level to the distance of ladle wall upper edge is 1250mm.
The actual (real) thickness 28mm of molten steel slag.
73.6 tons of molten steel weight.
The stainless steel grade of smelting: 0Cr18Ni9.
The chemical ingredients of molten steel is before handling:
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Nppm |
| 0.34 | 0.11 | 1.21 | 0.016 | 0.005 | 17.36 | 8.11 | 376 |
The temperature of molten steel is 1593 ℃ before handling.
The steps in sequence of present embodiment is as follows:
The time contents processing
Stainless molten steel was poured in the vacuum oxygen decarburization refining furnace ladle molten steel vacuum oxygen decarburization refining furnace working position into before 00:58 handled.
01:03 begins to vacuumize, from the bottom in the vacuum oxygen decarburization refining furnace stove Argon, argon flow amount 523NL/min, when the vacuum tightness in the vacuum oxygen decarburization refining furnace stove arrives 120Torr, oxygen blast in the vacuum oxygen decarburization refining furnace bag.
The 01:08 blowing oxygen quantity reaches 95m
3After the desiliconization, stop oxygen blast, begin to continue to vacuumize, vacuum tightness reaches 3.6Torr, is blown into peak flow 1196NL/min from the bottom argon gas, seethes with excitement 10 minutes, the denitrogenation of carrying out seething with excitement first time decarburization simultaneously.
After the 01:21 boiling finishes, reduce vacuum tightness, begin to be blown into oxygen and continue decarburization to 118Torr.
01:23 oxygen blast process is gas clean-up progressively, is blown into total amount of oxygen 626m
3, vacuum tightness is at 28.4Torr, and oxygen decarburization finishes, and the argon gas that is blown into from the vacuum oxygen decarburization refining furnace bottom is 660NL/min, and gas clean-up was seethed with excitement 10 minutes to 4.2Torr, carried out the deoxidation decarburization of seething with excitement the second time.
The 01:54 boiling finishes, and turns off BOTTOM ARGON BLOWING, and the top is blown into nitrogen and destroys vacuum.Measuring the stainless molten steel temperature is 1592 ℃, sampling analysis stainless molten steel composition (analytical results is seen below).
02:02 begins to vacuumize.
The sampling result of 02:06 01:54 analyze out for:
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Nppm |
| 0.04 | 0.02 | 1.09 | 0.018 | 0.006 | 16.99 | 8.16 | 90 |
When 02:07 vacuum tightness reaches 4.2Torr, be blown into argon gas from the bottom of vacuum oxygen decarburization refining furnace stove, add lime 1200Kg with the flow of 1156NL/min, fluorite 230kg, 75% ferrosilicon 832Kg reduced 10 minutes.
02:17 destroys vacuum in the oxygen decarburization refining furnace stove, and measuring the interior stainless molten steel temperature of ladle is 1571 ℃, and sample examination molten steel chemical ingredients % is:
Reach service requirements.
| C | Si | Mn | P | S | Cr | Ni | Nppm |
| 0.04 | 0.48 | 1.16 | 0.018 | 0.002 | 17.21 | 8.14 | 91 |
The denitrogenation of 02:22 smelting stainless steel in vacuum oxygen decarburization refining furnace finishes.
The 02:24 ladle hangs continuous casting.
Embodiment three
To the raw material smelted and smelting furnace require as follows:
Adopt double bogie type vacuum oxygen decarburization refining furnace stove, the volume of this stove is 75t, and freeboard is the slag liquid level to the distance of ladle wall upper edge is 1250mm.
The actual (real) thickness 24mm of molten steel slag.
71.8 tons of molten steel weight.
The stainless steel grade of smelting: 0Cr17.
The chemical ingredients of molten steel before handling:
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Nppm |
| 0.38 | 0.10 | 0.24 | 0.020 | 0.008 | 17.01 | 0.02 | 359 |
The temperature of molten steel is 1599 ℃ before handling.
The steps in sequence of present embodiment is as follows:
The time contents processing
Stainless molten steel was poured in the vacuum oxygen decarburization refining furnace ladle molten steel vacuum oxygen decarburization refining furnace working position into before 09:45 handled.
09:50 begins to vacuumize, from the bottom in the vacuum oxygen decarburization refining furnace stove Argon, argon flow amount 560NL/min, when the vacuum tightness in the vacuum oxygen decarburization refining furnace stove arrives 118Torr, oxygen blast in the vacuum oxygen decarburization refining furnace bag.
The 09:58 blowing oxygen quantity reaches 88m
3After the desiliconization, stop oxygen blast, begin to continue to vacuumize, vacuum tightness reaches 4.3Torr, and the bottom argon gas is blown into peak flow 1190NL/min, seethes with excitement 10 minutes, carries out seethe with excitement the first time denitrogenation and decarburization.
After the 10:13 boiling finishes, reduce vacuum tightness, begin to be blown into oxygen and continue decarburization to 110Torr.
10:16 oxygen blast process is gas clean-up progressively, is blown into total amount of oxygen 589m
3, vacuum tightness is at 33.5Torr, and oxygen decarburization finishes, and the argon gas that is blown into from the vacuum oxygen decarburization refining furnace bottom is 680NL/min, and gas clean-up was seethed with excitement 10 minutes to 4.1Torr, carried out the deoxidation decarburization of seething with excitement the second time.
The 10:51 boiling finishes, and turns off BOTTOM ARGON BLOWING, and the top is blown into nitrogen and destroys vacuum.Measuring the stainless molten steel temperature is 1603 ℃, sampling analysis stainless molten steel composition (analytical results is seen below).
10:55 begins to vacuumize.
When 11:00 vacuum tightness reaches 3.8Torr, be blown into argon gas from the bottom of vacuum oxygen decarburization refining furnace, add lime 1200Kg with the flow of 1155NL/min, fluorite 210kg, 75% ferrosilicon 590Kg reduced 10 minutes.
The sampling result of 11:02 10:51 analyze out for:
| C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Nppm |
| 0.02 | 0.02 | 0.22 | 0.021 | 0.005 | 16.75 | 0.02 | 96 |
11:15 destroys vacuum in the oxygen decarburization refining furnace stove, and measuring the interior stainless molten steel temperature of ladle is 1579 ℃, and sample examination molten steel chemical ingredients % is:
Meet service requirements.
| C | Si | Mn | P | S | Cr | Ni | Nppm |
| 0.02 | 0.36 | 0.22 | 0.022 | 0.002 | 16.89 | 0.02 | 97 |
The denitrogenation of 11:21 smelting stainless steel in vacuum oxygen decarburization refining furnace finishes, and ladle hangs continuous casting.
This smelting stainless steel in vacuum oxygen decarburization refining furnace high-carbon regions denitrogenation method is not limited to above-mentioned three embodiment, is applicable to all stainless steels.
Explanation of nouns
VOD: vacuum-oxygen decarbonizing technology, develop by Witten, Germany company.This purifying method can be added alloy and be carried out operation such as thermometric under vacuum, be mainly used in the refining stainless steel.Be characterized in top oxygen blast under reduced pressure, stir from bottom porous plug Argon simultaneously, reduce the CO dividing potential drop, quicken reaction between carbon and oxygen.VOD is 3 initials of English VacuumOxygen Decarburization.
LF: ladle refining furnace, by the exploitation in 1971 of Japanese special steel company, can handle various special steels, be characterized in electric-arc heating, add that synthetic slag is washed and Argon.LF is 2 initials of Ladle Furnace.
Claims (2)
1, a kind of smelting stainless steel in vacuum oxygen decarburization refining furnace high-carbon regions denitrogenation method, this method comprises the step of following order:
(1) stainless molten steel before handling is poured in the vacuum oxygen decarburization refining furnace ladle, the molten steel nitrogen content is not more than 500ppm, carbon content is more than or equal to 0.30%, liquid steel temperature is not less than 1590 ℃, the thick 40mm that is not more than of slag vacuumizes, and the bottom from vacuum oxygen decarburization refining furnace is blown into argon gas simultaneously, when making the interior vacuum tightness of vacuum oxygen decarburization refining furnace stove reach 150-200Torr, beginning oxygen blast in ladle;
(2) blowing oxygen quantity m
3=0.8 * molten steel weight (kg) * molten steel contains Si percentage composition+30 and carries out desiliconization, stops oxygen blast, and BOTTOM ARGON BLOWING is opened greatly, greater than 1000NL/min, simultaneously vacuum tightness is brought up to 4.3-3.6Torr, boiling is more than 8 minutes, carry out the denitrogenation of seething with excitement the first time, and decarburization;
(3) boiling finishes, and vacuum oxygen decarburization refining furnace continues oxygen decarburization, and gas clean-up reduces the stove internal gas pressure gradually simultaneously, and when target was arrived in decarburization, vacuum tightness was at 20-40Torr;
(4) stop oxygen blast, the vacuum tightness in the vacuum oxygen decarburization refining furnace is extracted into below the 5Torr, be blown into argon gas from the vacuum oxygen decarburization refining furnace furnace bottom, make the stainless steel water boiling more than 8 minutes, ebullient carries out the deoxidation decarburization second time simultaneously;
(5) after boiling finishes, control vacuum tightness is below 10Torr, to be blown into argon gas from the bottom of vacuum oxygen decarburization refining furnace greater than the flow of 1000NL/min, add lime and fluorite, and calculate the ferrosilicon amount according to the formula of deriving below according to the chemical ingredients of molten steel at this moment, add ferrosilicon or aluminium reducing, keep vacuum time greater than 10 minutes
Add siliceous 75% ferrosilicon amount=1.67 * (be blown into total amount of oxygen m
3-0.933 * molten steel initial carbon content * molten steel initial weight kg-0.8 * molten steel initial silicon content * molten steel initial weight kg)+molten steel weight kg * product molten steel requirement silicone content ÷ 0.75; The smelting furnace of volume 75t adds 80-150kg aluminium;
(6) afterwards, turn off the vacuum oxygen decarburization refining furnace argon bottom-blowing, the top is blown into nitrogen and destroys vacuum;
(7) open vacuum cover, the composition of sample examination stainless steel water, when meeting the requirements, steel tapping casting.
2, according to claim 1 smelting stainless steel in vacuum oxygen decarburization refining furnace high-carbon regions denitrogenation method, it is characterized in that: adding lime and fluorite and ferrosilicon or aluminium reducing, keep vacuum time greater than after 10 minutes, chemical ingredients in the molten steel or temperature still do not meet service requirements, molten steel is poured in ladle refining furnace or other refining equipment, smelting process is carried out refining routinely.
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| KR100922061B1 (en) * | 2007-12-12 | 2009-10-16 | 주식회사 포스코 | Method of manufacturing ultra low carbon ferritic stainless steel |
| CN101845538B (en) * | 2009-03-26 | 2011-11-23 | 宝山钢铁股份有限公司 | Method for controlling vigorous splash during smelting stainless steel in vacuum oxygen decarburization refining furnace |
| CN101994068B (en) * | 2009-08-25 | 2012-12-26 | 宝山钢铁股份有限公司 | Austenitic stainless steel plate |
| CN102199684B (en) * | 2010-03-25 | 2013-03-13 | 宝山钢铁股份有限公司 | Production method of ultralow-oxygen titanium-containing ferrite stainless steel |
| CN102199688B (en) * | 2010-03-25 | 2013-02-06 | 宝山钢铁股份有限公司 | Method for efficiently refining ultra-pure ferritic stainless steel |
| CN105734203B (en) * | 2016-03-16 | 2017-10-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of double-position vacuum oxygen decarburization smelting process of super-purity ferrite stainless steel |
| CN107267850B (en) * | 2017-06-07 | 2019-02-01 | 北京科技大学 | The stainless steel smelting method of chromium in a kind of recycling smelting slag |
| CN110551874B (en) * | 2019-09-18 | 2021-08-24 | 舞阳钢铁有限责任公司 | Smelting method for improving vacuum aluminum recovery rate |
| CN116254386B (en) * | 2023-02-17 | 2024-05-28 | 张家港广大特材股份有限公司 | Medium alloy electric furnace steel smelting method |
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