CN102899456A - Method for reducing temperature rise and nitrogen increase of molten steel in ladle refining furnace - Google Patents
Method for reducing temperature rise and nitrogen increase of molten steel in ladle refining furnace Download PDFInfo
- Publication number
- CN102899456A CN102899456A CN2012103612528A CN201210361252A CN102899456A CN 102899456 A CN102899456 A CN 102899456A CN 2012103612528 A CN2012103612528 A CN 2012103612528A CN 201210361252 A CN201210361252 A CN 201210361252A CN 102899456 A CN102899456 A CN 102899456A
- Authority
- CN
- China
- Prior art keywords
- argon
- molten steel
- argon gas
- stove
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007670 refining Methods 0.000 title claims abstract description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 211
- 229910052786 argon Inorganic materials 0.000 claims abstract description 105
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 22
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 22
- 239000004571 lime Substances 0.000 claims abstract description 22
- 238000005187 foaming Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 77
- 238000010438 heat treatment Methods 0.000 claims description 20
- 230000004907 flux Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 12
- 239000000428 dust Substances 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 7
- 239000002893 slag Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a method for reducing temperature rise and nitrogen increase of molten steel in a ladle refining furnace. When molten steel is treated in the LF furnace, argon is respectively blown into the furnace through the electrode argon hole and the argon blowing hole in the argon ring pipe. In the temperature rise process of the LF furnace, the rotating speed of the dust removal fan is reduced to 30-70% of the normal rotating speed, and 1-3 batches of foaming lime are added into the molten steel, wherein the adding amount of each batch is 1-3kg of the foaming lime added into each ton of steel. The invention can control the mass percentage of the nitrogen increase amount of molten steel in the average temperature rise time per minute in the temperature rise process to be below 0.00003 percent, reduce the nitrogen increase of the LF furnace in the temperature rise process, improve the submerged arc effect, reduce the influence of the nitrogen increase of the molten steel on the quality of the molten steel and improve the quality of the molten steel treated by the LF furnace.
Description
Technical field
The invention belongs to the process for making technical field, be specifically related to a kind of method that in ladle refining furnace (LF stove) refining process, reduces molten steel heating nitrogen pick-up.
Background technology
The LF stove is one of Main Means of present steel secondary refining, and it has the several functions such as submerged arc heating, Argon stirring, slag making, deoxidation and alloying, for raising steel quality, adjusting rhythm of production very important effect is arranged all.The LF stove be adopt electric furnace reduction period principle design out, its outstanding advantages is high efficiency slag making desulfurization, has very strong advantage for super low sulfur steel grades such as production flow line steel.Simultaneously, owing to adopting the electric-arc heating molten steel, the technique that contrast adopts " aluminium-oxygen " or materials such as " silicon-oxygen " to carry out the molten steel chemical heating is compared, and the impact that can not cause the metal oxide such as aluminium sesquioxide that molten steel is mingled with has improved the purity of molten steel.
Yet, since the LF stove in carrying out the electric-arc heating temperature-rise period can because electric arc to air in the ionizing event of nitrogen, be easy to cause the nitrogen pick-up of molten steel, for most of steel grade, nitrogen content there is strict requirement, the quality of too much nitrogen pick-up meeting remarkably influenced steel, and have influence on the final correlated performance of steel.Therefore be necessary to study a kind of method of effective control LF stove intensification nitrogen pick-up, process the quality of molten steel to improve the LF stove.
Summary of the invention
The present invention aims to provide a kind of method that can effectively control nitrogen pick-up in the LF stove molten steel heating process, thereby improves the submerged arc effect, reduces the molten steel nitrogen increased amount, alleviates because molten steel nitrogen pick-up on the impact of steel quality, improves the quality that the LF stove is processed molten steel.
For this reason, the present invention has taked following solution:
A kind of method that reduces the nitrogen pick-up of ladle refining furnace molten steel heating, its concrete grammar is:
1, be that the center of LF stove three root graphite electrodes processes respectively an argon gas hole at ladle refining furnace, the argon gas hole is by hose connection argon gas pipeline; When the LF stove is processed molten steel, in stove, be blown into argon gas by Graphite Electrodes argon gas hole, the argon gas supply gas pressure is controlled at 0.4-0.8MPa, and the argon flow amount in each argon gas hole is controlled at 20-200 l/min.
2, along circumference the argon gas endless tube is installed under LF stove bell, is evenly equipped with 10-50 argon blowing hole on the argon gas endless tube, the argon blowing hole opening direction is towards the gap of bell and ladle, and the argon gas endless tube is connected with the argon gas pipeline by air induction hose; When the LF stove was processed molten steel, the argon blowing hole below bell on the argon gas endless tube carried out Argon, and argon pressure is controlled at 0.4-0.8MPa, and the Argon amount of whole argon gas endless tube is controlled at 250-500 l/min.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to the 30-70% of maximum speed of revolution, makes the furnace gas pressure-fired in the LF stove; And in molten steel, divide a 1-3 to criticize adding foaming lime, every batch of add-on is that steel per ton adds 1-3kg; In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution, use lime as sludging flux.
Described foaming lime means the lime of not grilling thoroughly fully, CaCO in the foaming lime
3Mass percentage content is 10-20%.
Beneficial effect of the present invention is:
Adopt the present invention can control the mass percent of average interior molten steel nitrogen increased amount of per minute heating-up time in the temperature-rise period below 0.00003%, thereby reduce the nitrogen pick-up of LF stove in temperature-rise period, improve the submerged arc effect, alleviate because molten steel nitrogen pick-up on the impact of steel quality, improves the quality that the LF stove is processed molten steel.
Description of drawings
Fig. 1 is the electrode schematic diagram with the argon gas hole.
Fig. 2 is the LF stove bell upward view with the argon gas endless tube.
Among the figure: flexible pipe 1, electrode 2, argon gas hole 3, bell 4, argon gas endless tube 5, air induction hose 6.
Embodiment
Take 180 tons of LF stoves, processing steel grade Q235B as example, the present invention will be further described.
Before the enforcement, 3, three the argon gas holes 3, argon gas hole that at first process respectively a diameter at the center of LF stove three root graphite electrodes 2 and be 5-10mm are connected on the argon gas pipeline by flexible pipe 1 respectively.Then along circumference argon gas endless tube 5 is installed at the lower of LF stove bell 4, the argon blowing hole that to be evenly equipped with 10-50 diameter on the argon gas endless tube 5 be 2-5mm, the argon blowing hole opening direction is towards the gap of bell 4 with ladle, and argon gas endless tube 5 is connected with the argon gas pipeline by air induction hose 6.
Embodiment 1:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.4MPa, and the argon flow amount in each argon gas hole is controlled at 50 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, has reduced air and participated in the probability of ionization nitrogen pick-up, thereby reduced the nitrogen pick-up of molten steel.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.5MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 250 l/min, thereby can reduce the air concentration in the stove, the nitrogen pick-up of control molten steel.
3, in the LF stove temperature-rise period, it is 442rpm that the rotating speed of dedusting fan is down to 66% of maximum speed of revolution, makes the furnace gas pressure-fired in the LF stove, avoids the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle, reduces molten steel nitrogen pick-up.
Simultaneously, disposable adding contains CaCO in the molten steel
3Mass percent is 16% foaming lime 200 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air, the nitrogen pick-up of minimizing molten steel.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0026%, and finishing the nitrogen content mass percent is 0.0027%.
Embodiment 2:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.7MPa, and the argon flow amount in each argon gas hole is controlled at 90 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, reduced the probability that air participates in ionization nitrogen pick-up.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.6MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 300 l/min, reduces the air concentration in the stove.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to 389rpm, makes the furnace gas pressure-fired in the LF stove, avoid the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle.
Simultaneously, add in two batches in the molten steel and contain CaCO
3Mass percent is 20% foaming lime, and every batch adds 225 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0021%, and finishing the nitrogen content mass percent is 0.0024%.
Embodiment 3:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.8MPa, and the argon flow amount in each argon gas hole is controlled at 150 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, reduced the probability that air participates in ionization nitrogen pick-up.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.7MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 420 l/min, reduces the air concentration in the stove.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to 268rpm, makes the furnace gas pressure-fired in the LF stove, avoid the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle.
Simultaneously, add in two batches in the molten steel and contain CaCO
3Mass percent is 12% foaming lime, and every batch adds 355 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0019%, and finishing the nitrogen content mass percent is 0.0023%.
Embodiment 4:
1, when the LF stove is processed molten steel, be blown into argon gas by argon gas hole 3 in stove, the argon gas supply gas pressure is controlled at 0.5MPa, and the argon flow amount in each argon gas hole is controlled at 190 l/min.In the molten steel heating process, because argon gas is blown near the arc zone by the center of electrode 2, reduced the probability that air participates in ionization nitrogen pick-up.
When 2, the LF stove is processed molten steel, carry out Argon by the argon blowing hole on the argon gas endless tube 5, argon pressure is controlled at 0.8MPa, and the Argon amount of whole argon gas endless tube 5 is controlled at 500 l/min, reduces the air concentration in the stove.
3, in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to 201rpm, makes the furnace gas pressure-fired in the LF stove, avoid the temperature-rise period Air to be drawn in the LF stove by the slit between bell 4 and the ladle.
Simultaneously, add in three batches in the molten steel and contain CaCO
3Mass percent is 10% foaming lime, and every batch adds 280 kg, by CaCO in the foaming lime
3The effect of reducing foaming, form good foamy slag, thereby improve the submerged arc effect, reduce the contact probability of electric arc and air.In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution 670 rpm, use lime as sludging flux.
After implementing as stated above, the initial nitrogen content mass percent of LF stove is 0.0031%, and finishing the nitrogen content mass percent is 0.0037%.
Claims (2)
1. method that reduces the nitrogen pick-up of ladle refining furnace molten steel heating is characterized in that:
(1), be that the center of LF stove three root graphite electrodes processes respectively an argon gas hole at ladle refining furnace, the argon gas hole is by hose connection argon gas pipeline; When the LF stove is processed molten steel, in stove, be blown into argon gas by Graphite Electrodes argon gas hole, the argon gas supply gas pressure is controlled at 0.4-0.8MPa, and the argon flow amount in each argon gas hole is controlled at 20-200 l/min;
(2), under LF stove bell, along circumference the argon gas endless tube is installed, be evenly equipped with 10-50 argon blowing hole on the argon gas endless tube, the argon blowing hole opening direction is towards the gap of bell and ladle, and the argon gas endless tube is connected with the argon gas pipeline by air induction hose; When the LF stove was processed molten steel, the argon blowing hole below bell on the argon gas endless tube carried out Argon, and argon pressure is controlled at 0.4-0.8MPa, and the Argon amount of whole argon gas endless tube is controlled at 250-500 l/min;
(3), in the LF stove temperature-rise period, the rotating speed of dedusting fan is down to the 30-70% of maximum speed of revolution, make the furnace gas pressure-fired in the LF stove; And in molten steel, divide a 1-3 to criticize adding foaming lime, every batch of add-on is that steel per ton adds 1-3kg; In the LF treating processes when not heating up rotation speed of fan be transferred to maximum speed of revolution, use lime as sludging flux.
2. the method for minimizing ladle refining furnace molten steel heating according to claim 1 nitrogen pick-up is characterized in that, CaCO in the described foaming lime
3Mass percentage content is 10-20%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2012103612528A CN102899456A (en) | 2012-09-25 | 2012-09-25 | Method for reducing temperature rise and nitrogen increase of molten steel in ladle refining furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2012103612528A CN102899456A (en) | 2012-09-25 | 2012-09-25 | Method for reducing temperature rise and nitrogen increase of molten steel in ladle refining furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
CN102899456A true CN102899456A (en) | 2013-01-30 |
Family
ID=47571941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2012103612528A Pending CN102899456A (en) | 2012-09-25 | 2012-09-25 | Method for reducing temperature rise and nitrogen increase of molten steel in ladle refining furnace |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN102899456A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107164610A (en) * | 2017-06-07 | 2017-09-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel increasing method for nitrogen |
CN115717180A (en) * | 2022-11-01 | 2023-02-28 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in LF refining process |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0177908A1 (en) * | 1984-10-12 | 1986-04-16 | Nippon Kokan Kabushiki Kaisha | Arc-heating type extra-furnace refining apparatus |
US4650517A (en) * | 1985-05-29 | 1987-03-17 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
CN1218900A (en) * | 1997-11-28 | 1999-06-09 | 北京兰斯节能技术开发中心 | Direct current steel ladle refiner |
CN2550708Y (en) * | 2002-06-25 | 2003-05-14 | 罗廷和 | AC plasma steel ladle refining furnace |
CN102031338A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Method for stably increasing nitrogen in molten steel |
CN102260770A (en) * | 2010-05-26 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Slag material for refinery furnace |
CN102296160A (en) * | 2011-08-16 | 2011-12-28 | 秦皇岛首秦金属材料有限公司 | Low-cost RH molten steel nitrogen increasing and controlling process |
CN202415609U (en) * | 2011-12-20 | 2012-09-05 | 鞍钢股份有限公司 | Argon sealing device for furnace cover of ladle refining furnace |
-
2012
- 2012-09-25 CN CN2012103612528A patent/CN102899456A/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0177908A1 (en) * | 1984-10-12 | 1986-04-16 | Nippon Kokan Kabushiki Kaisha | Arc-heating type extra-furnace refining apparatus |
US4650517A (en) * | 1985-05-29 | 1987-03-17 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
CN1218900A (en) * | 1997-11-28 | 1999-06-09 | 北京兰斯节能技术开发中心 | Direct current steel ladle refiner |
CN2550708Y (en) * | 2002-06-25 | 2003-05-14 | 罗廷和 | AC plasma steel ladle refining furnace |
CN102031338A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Method for stably increasing nitrogen in molten steel |
CN102260770A (en) * | 2010-05-26 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Slag material for refinery furnace |
CN102296160A (en) * | 2011-08-16 | 2011-12-28 | 秦皇岛首秦金属材料有限公司 | Low-cost RH molten steel nitrogen increasing and controlling process |
CN202415609U (en) * | 2011-12-20 | 2012-09-05 | 鞍钢股份有限公司 | Argon sealing device for furnace cover of ladle refining furnace |
Non-Patent Citations (1)
Title |
---|
李玮等: "降低LF炉精炼过程钢水增氮量的生产实践", 《冶金丛刊》 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107164610A (en) * | 2017-06-07 | 2017-09-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel increasing method for nitrogen |
CN115717180A (en) * | 2022-11-01 | 2023-02-28 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in LF refining process |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107699711B (en) | Copper smelting method | |
CN102010934B (en) | RH refining desulphurization process of non-oriented electrical steel | |
CN104878297B (en) | A kind of production method of low titanium beating steel GCr15 | |
CN103627841A (en) | Control method for nitrogen content of molten steel of wear-resistant steel | |
CN103952511A (en) | Method for controlling nitrogen content of high-strength steel molten steel | |
WO2019029136A1 (en) | Clean and rapid smelting method for all scrap steel electric arc furnace | |
CN105018855A (en) | Method for producing circular sulfur-resistant pipeline steel billet for oil and gas collection and transmission | |
CN103627836B (en) | A kind of steel-smelting device and method | |
CN103555889A (en) | Device and method for quickly removing occluded foreign substances in molten steel | |
CN103525982A (en) | Single-dip-pipe vacuum refining device and using method thereof | |
CN107365890A (en) | Method for controlling inclusions in X80 pipeline steel | |
CN107513598B (en) | A kind of molten iron tank deck bottom composite blowing sulfur method | |
CN105624367B (en) | Refining device and method for controlling nitrogen content of molten steel | |
CN103409575A (en) | Reducing agent for slag cleaning furnace top-blown immersion blowing reduction | |
CN106148631A (en) | A kind of method of converter smelting low-sulfur ultralow nitrogen molten steel | |
CN103215406B (en) | Low-carbon and ultralow sulfur steel smelting method | |
CN102899456A (en) | Method for reducing temperature rise and nitrogen increase of molten steel in ladle refining furnace | |
CN106282750A (en) | A kind of improve the method for carbide in electroslag remelting mould steel | |
CN107779550B (en) | The method of molten steel manganeisen additional amount is reduced in a kind of refining process | |
CN107988456B (en) | A kind of converter steelmaking process | |
CN102191352A (en) | Coherent jet lance | |
CN109234489A (en) | The control method of catch carbon stage nitrogen increased amount is reduced when a kind of converter smelting mild steel | |
CN104451022B (en) | A kind of method reducing dephosphorization stove finishing slag all iron content | |
CN108660290A (en) | Top and bottom composite argon blowing refining device and method for medium-frequency induction furnace | |
CN109852881B (en) | Steel for 45CrNiMoVA drill tool and production method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130130 |