CN105695664B - A kind of low cost pneumatic steelmaking deoxidization technique - Google Patents
A kind of low cost pneumatic steelmaking deoxidization technique Download PDFInfo
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- CN105695664B CN105695664B CN201610255520.6A CN201610255520A CN105695664B CN 105695664 B CN105695664 B CN 105695664B CN 201610255520 A CN201610255520 A CN 201610255520A CN 105695664 B CN105695664 B CN 105695664B
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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
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C5/28—Manufacture of steel in the converter
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/0025—Adding carbon material
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention discloses a kind of inexpensive pneumatic steelmaking deoxidization technique, the technique is characterized in converter tapping process, carbon dust is added and double deoxidizer carries out segmentation deoxidation, total oxygen content in molten steel is reduced by controlling deoxidation opportunity and optimization tapping deoxidization operating process, conventional aluminum ferrum deoxidizer is replaced using cheap carbon dust and double deoxidizer, deoxidation cost can be substantially reduced, reduce nonmetal inclusion simultaneously, the ratio of steel inclusion rank≤1.5 that the deoxidization technique can make is improved to 98.21%, continuous casting wadding flow rate is reduced to 0.32%, 1.58 yuan of ton steel-deoxidizing cost reduction, increase profit margin while improving steel quality for enterprise.
Description
Technical field
The invention belongs to technical field of steel production, more particularly to a kind of inexpensive pneumatic steelmaking deoxidization technique.
Background technology
Pneumatic steelmaking smelts latter stage molten steel and dissolves in excess of oxygen, and excessive oxygen is precipitated in solidification of molten steel to be formed oxide and be mingled with
And bubble, directly affect the quality of strand, steel product.Therefore it needs to reduce converter terminal oxygen content in steelmaking process, this is
The source of steel inclusion.Currently, mainly being had using method of deoxidation in domestic industry steelmaking process：Aluminium deoxidation method is going out
Metallic aluminium is added in molten steel when from steel to ladle, and this deoxidation method method is fairly simple, but deoxidation effect is unstable, easily generates
Al2O3Class nonmetal inclusion, such Particulate Inclusion is small to be not easy the slagging that floats, and causes nonmetal inclusion in steel to increase, and aluminium price is super
10,000 yuan/ton are crossed, ton steel cost is high；Carbon deoxidation method, is added carbonaceous material before tapping into ladle, and this method of deoxidation also compares
Relatively simple, deoxidation effect is also unstable, easy tos produce molten steel " turning over packet " and security risk occurs, and can make molten steel recarburization；Also silicon
The methods of Ca-alloy For Deoxidation method, core wire deoxidation method, although these method deoxidation effects are preferable, cost is higher.
Such as patent《Deoxidising agent for manufacture of steel with converters》(application number：89105941.5) deoxidier is put into ladle before open tapping
Deoxidation is carried out, deoxidant ingredient is (weight %)：65~96%CaC2, 4~35%SiC, this method due to deoxidizing capacity be Si,
Ca ＞ C, the leading deoxidation of Si, Ca in molten steel, carbon are easy reaction and not exclusively generate increasing charcoal；Patent《A kind of low-cost arc furnace goes out
Steel-deoxidizing technique》(application number：CN200710031301) open using carbon dust pre-deoxidation, the shallow deoxidation of ferrosilicon, aluminium block deep deoxidation
Three step deoxidization techniques, though this method can reduce deoxidation cost and a large amount of aluminium generation Al are added2O3Class is mingled with, such, which is mingled with, is not easy
Slagging removes, and molten steel viscosity is made to increase, and easily causes casting machine wadding stream.
Therefore convertor deacidification is badly in need of wanting a kind of new inexpensive deoxy technology, cleaning molten steel while reduce convertor deacidification at
This.
Invention content
The technical assignment of the present invention is to be directed to the above the deficiencies in the prior art, provides a kind of inexpensive pneumatic steelmaking deoxidation work
Skill replaces the high cost deoxidier in part using segmentation deoxidation using inexpensive deoxidier, declines reaching same deoxidation effect
Low convertor deacidification cost, and can effectively control in steel and be mingled with, stabilized product quality.
The present invention the technical solution to solve the technical problem is that：A kind of low cost pneumatic steelmaking deoxidization technique, feature exist
In including following：
(1) simple substance carbon dust is added after tapping, it is 20S after tapping, simple substance carbon dust 60S times after tapping that the time is added earliest
It is added in range；
(2) after carbon dust adds interval 20S~30S, the double deoxidizer of 1.2~1.8kg/t, whole double deoxidizers are added
It is added in 180S time ranges after tapping；
The wherein described double deoxidizer ingredient be 40.5~49.3% silicon, 18.5~26.0% calcium, 27.7~31.5% barium,
0~2% aluminium.
The quantity that time length depends on tapping is specifically added in the double deoxidizer, but needs the 180S after tapping
It is all added in time range.
Compared with prior art, the present invention has advantageous effect following prominent：
1, product deoxidation effect is good, and using segmentation deoxidization technique, simple substance carbon dust is added early period in tapping, ensures carburetting ＜ in steel
100ppm, deoxidation amount is maximum while avoiding that the incomplete carburetting of carbon dust excessive response is added, and carbon dust utilization rate 50% reaches carbon dust
The optimum efficiency of deoxidation.It is added containing 40.5~49.3% silicon, 18.5~26.0% calcium, 27.7~31.5% barium in tapping 180S
And 0~2% aluminium, so that inclusion floating, entire oxygen content in the steel content is had by 48ppm, is reduced by converter tapping good dynamics condition
To 35ppm, reduces 13ppm and deoxidation and Control and Inclusion Removal effect are good.
2, deoxidation is at low cost, using the present invention deoxidation mode, ferro-aluminum usage amount ton steel reduce 1.57kg, deoxidation cost by
14.23 yuan of steel of ton is down to 12.65 yuan；1.58 yuan of ton steel-deoxidizing cost reduction, deoxidation cost reduction effectively improves the benefit of enterprise
Space.
3, effectively reduce nonmetal inclusion content in steel, improve steel quality, in Si-Ca-Ba double deoxidizer containing 0~
2% aluminium component has other aluminium deoxidations to compare, 80% or more dosage reduction, meanwhile, the presence of calcium, barium can in time produce aluminium deoxidation
Raw inclusion modification, the recovery rate of the aluminium oxide in 80% or more, steel, which is mingled with, to be significantly reduced, steel inclusion rank≤1.5
Ratio improved to 98.21% by 93.32%；Continuous casting wadding flow rate is reduced to 0.32% by 1.03%.
Specific implementation mode
The present invention is further described With reference to embodiment.
Different according to deoxidation degree when smelting, steel is divided into boiling steel, semi-killed steel and killed steel.In order to preferably into line number
According to upper comparison, the steel grade of control group and the selection of each embodiment is all killed steel (Q235B/Q345B/A36Cr/SS400Cr/
The steel grades such as SAE1008B), but deoxidization technique disclosed by the invention is suitable for except ultra-low-carbon steel (C ＜ 0.04%), low-silicon steel (Si ＜
0.10%) all non-aluminum killed steels outside.
Control group
Killed steel (steel grade A36Cr) processing step is as follows：
(1) ladle is opened to converter tapping position, opens bottom blowing system, bottom blowing flow 500m3/h；
(2) grate puts steel and starts timing, the tapping later stage (if the tapping time is 7min, be added the time is tapping 4min after)
1.7kg ferro-aluminum deoxidiers deoxidation (containing aluminium 45%) is added.
After deoxidier adds, argon bottom-blowing is closed to the end of putting steel；Ladle is opened to argon station, open Bottom Argon Stirring so that at
Point, temperature it is uniform, bottom blowing flow 300m3/h；After after argon station Argon 180S, determining oxygen, thermometric, taking ingredient sample, ladle moves to LF essences
Furnace refining treatment.
The deoxidization technique that control group is groped for inventor before process modification, is had the following defects using this method deoxidation：①
Alfer, which is exposed in wet air, forms primary battery, and aluminium is corroded as anode, and remaining iron has many apertures,
It is easy, by dusting, to influence to use；2. ferro-aluminum deoxidier, which is added, carries out deoxidation, ferro-aluminum deoxidier price is high, and dosage is big, directly affects
Ton steel cost；3. [O] easily reacts with [Al] and generates Al in molten steel2O3Class is mingled in tufted or catena shape, such Particulate Inclusion
It is tiny to be not easy exclusion of floating, increase molten steel viscosity in molten steel, so that fluidity molten steel is deteriorated, easily cause dross in water outlet, from
And conticaster wadding stream is caused, it influences to produce, influences ton steel cost indirectly；4. influencing finished product quality, pass through the deoxidation after testing
The ratio of the product that method obtains, steel inclusion rank≤1.5 is 93.32%, and casting machine wadding flow rate is 1.03%, increases enterprise
Economic loss.
Embodiment 1
For killed steel (steel grade A36Cr) processing step：
(1) ladle is opened to converter tapping position, opens bottom blowing system, bottom blowing flow 300m3/h；
(2) grate puts steel and starts timing, and simple substance carbon dust 0.58kg/t is initially added into after the 20S that taps, and (ton steel addition is
0.58kg), simple substance carbon dust adds after tapping in 40S time ranges.In order to preferably realize carbon dust deoxidation, add bottom blowing stream after carbon
Amount is reduced to 200m3/ h, at this time carbon dust deoxidation generate CO gases and participate in molten steel stirring.In addition, carbon dust is added too early in order to prevent
Molten steel " turning over packet " is caused, safety accident is caused, the general time of tapping is 7min or so, therefore the suitable time of simple substance carbon dust is added
To be added in 20~60S time ranges after tapping, ensures that carbon dust comes into full contact with oxygen, improve carbon dust DNA vaccine；
(3) after carbon dust adds interval 30S, double deoxidizer 1.2kg/t, whole double deoxidizers 80S- after tapping is added
It is added in 140S time ranges.The ingredient (mass fraction) of the double deoxidizer is 49.3% silicon, 18.5% calcium, 31.2%
Barium and 1% aluminium.Time interval between carbon dust and double deoxidizer be must element, its object is to oxygen in carbon dust and steel at
Divide reaction, prevents carburetting in steel.
After deoxidier adds, required other alloys can be added according to finished product demand, closed after steel to be put
Argon bottom-blowing；Ladle is opened to argon station, opens Bottom Argon Stirring so that ingredient, temperature are uniform, bottom blowing flow 150m3/h；Argon station is blown
After after argon 180S, determining oxygen, thermometric, taking ingredient sample, ladle moves to LF refining furnace refining treatment.
It is closely related whether the addition opportunity of the double deoxidier of this technique with deoxidation can reach effect：The deoxidation mode is pressed
Within 20~60S periods, carbon dust is first added after tapping in 0.17~0.58kg/t ratios, and pause 20~30s after adding carbon,
[C] [O], which reacts, in ladle generates the discharge of CO gases, is conducive to carburetting ＜ 100ppm in control steel, avoids addition carbon dust excessive
While reacting incomplete carburetting, deoxidation amount is maximum, reaches the optimum efficiency of carbon dust deoxidation, and carbon dust deoxidation utilization rate ＞
50%.And carbon dust deoxidation products is CO gases, can be discharged from molten steel in time, will not form new field trash.
This technique added in tapping early period 180S double deoxidizer (40.5~49.5% silicon, 18.5~26.0% calcium,
27.0~31.5% barium and 0~2% aluminium).This technique is compound de- due to having carried out basic deoxidation with simple substance carbon before
The ingredient and usage amount of oxygen agent make a big difference compared with the prior art.It is nothing in the double deoxidizer in this technological design first
The ratio of ferrous components and aluminium greatly reduces, it might even be possible to which the not ingredient of aluminium, and ferro-aluminum deoxidation in the prior art will produce
The generation of the alundum (Al2O3) deoxidation products and MnS of a large amount of difficult removals, field trash are difficult to floating removal in time and remain and arrive molten steel
In, Molten Steel Cleanliness is influenced, ferro-aluminum deoxidier usage amount is greatly reduced using the deoxidation mode deoxidation of this technique, improves molten steel matter
While amount, reduction casting machine wadding stream probability, deoxidation cost is reduced, for enterprise's promotion profit margin.Secondly Si, Ca, Ba ingredient ratio
Example is more rational：Alkaline-earth metal Ca, Ba low boiling point, volatile loss, and Si can reduce the volatilization loss of Ca, Ba, improve member
Plain utilization rate, Ca, Si deoxidation products CaO-SiO2.The presence of Ca increases the solubility of Si, while Ca can make nonmetallic folder
Miscellaneous denaturation and be easily removed, improve the deoxidation utilization rate of Ca, Si, the presence of Ba can improve the deoxidation effect of Ca, Si and de-
Sulphur ability, crystal grain thinning.In addition, the existing double deoxidizer containing Si, Ca, Ba ingredient, addition are mostly 10~20kg/t,
Its reason is between deoxidier and molten steel that contact area is small, and deoxidation products cannot dissipate in time, therefore affect deoxidation effectiveness,
So for the deoxidation effect reached, the usage amount for increasing deoxidier is would have to, it is meant that under cost, product purity
Drop.And in this technique, carbon dust basic deoxidation in advance is taken, and generate valuable gases and fine dispersion particle rapidly, and CO gases
Enhance molten steel disturbance, silicon, calcium, barium can be sufficiently mixed in the case of this disturbance with molten steel, and deoxidation products is constantly quick
It floats and inhales, chemical effect is superimposed with physical effect, gives full play to calcium, the desulfurization of barium and inclusion modification ability, can be effective
Reduction deoxidation impurity and MnS generation, improve Molten Steel Cleanliness, and then improve pourability of molten steel, reduce casting machine wadding stream, carry
High slab quality.And this technique, change traditional deoxidier tapping the middle and later periods be added mode, after tapping 20S~
Deoxidier twice is completed in the 180S times to be added, and is realized gradient deoxidation, and the cooperation of chemical reaction and physical perturbation, is being ensured
In the effect of deoxidation, cost has greatly been saved.The simple substance carbon dust and the specific addition of double deoxidizer depend on out
The quantity of steel, therefore the addition time is different in size, as long as pilot-scale experiment shows simple substance carbon dust after tapping in 60S time ranges
It adds, whole double deoxidizers add after tapping in 180S time ranges, can both reach satisfactory deoxidation effect.This implementation
It is specially that simple substance carbon dust 40S after tapping is added in example, whole double deoxidizers are added in 140S.
Embodiment 2
For killed steel (steel grade Q345B3) deoxidization technique step：
(1) ladle is opened to converter tapping position, opens bottom blowing system, bottom blowing flow 250m3/h；
(2) grate puts steel and starts timing, and simple substance carbon dust 0.36kg/t is initially added into after the 40S that taps.Add bottom blowing flow after carbon
It is reduced to 150m3/ h, simple substance carbon dust add after tapping in 60S time ranges；
(3) after carbon dust adds interval 25S, double deoxidizer 1.5kg/t, whole double deoxidizers 80S after tapping is added
It is added in~130S time ranges；The ingredient (mass fraction) of the double deoxidizer is 47.5% silicon, 24.5% calcium, 28%
Barium.
It is specially that simple substance carbon dust 60S after tapping is added in the present embodiment, whole double deoxidizers are added in 130S.
Embodiment 3
For killed steel (steel grade Q235B2) deoxidization technique step：
(1) ladle is opened to converter tapping position, opens bottom blowing system, bottom blowing flow 200m3/h；
(2) grate puts steel and starts timing, and simple substance carbon dust 0.17kg/t is initially added into after the 58S that taps.Add bottom blowing flow after carbon
It is reduced to 100m3/ h, simple substance carbon dust add after tapping in 60S time ranges；
(3) after carbon dust adds interval 20S, double deoxidizer 1.8kg/t, whole double deoxidizers 130S after tapping is added
It is added in~180S time ranges；The ingredient (mass fraction) of the double deoxidizer be 44.4% silicon, 25.9% calcium,
27.7% barium and 2% aluminium.
It is specially that simple substance carbon dust 60S after tapping is added in the present embodiment, whole double deoxidizers are added in 180S.
Embodiment 4
For killed steel (steel grade A36Cr) deoxidization technique step：
(1) grate puts steel and starts timing, and simple substance carbon dust 0.58kg/t is initially added into after the 20S that taps, wherein 50% with steel stream
It is added in ladle together, 50% passes through ladle bottom blowing system (bottom blowing flow 300m3/ h) enter in ladle from packet bottom blowing.Add bottom after carbon
Wind drift amount is reduced to 200m3/ h, simple substance carbon dust add after tapping in 60S time ranges；
(2) after carbon dust adds interval 30S, double deoxidizer 1.2kg/t, whole double deoxidizers 90S after tapping is added
It is added in~140S time ranges；The ingredient (mass fraction) of the double deoxidizer be 40.5% silicon, 26.0% calcium,
31.5% barium and 2% aluminium.Part carbon dust using ladle bottom blowing argon gas as medium, be blown into ladle bottom primarily to improve carbon dust with
The time of contact of molten steel and contact surface area are reacted conducive to carbon with oxygen, and deoxidation of molten steel utilization rate is improved；Meanwhile toner density is small,
Molten steel surface is floated on after addition, addition is more late, is more unfavorable for reacting with oxygen in steel, but is added too early, and carbon dust is gathered in packet bottom,
As molten steel increases, carbon generated reactive gas is discharged not in time, and " turning over packet " phenomenon easily occurs for the later stage, causes safety accident, uses
Argon gas is blown into bottom and effectively carbon dust is avoided to assemble, and generates gas as argon bottom-blowing is discharged in time, can effectively avoid " turning over packet "
Phenomenon occurs.It is specially that simple substance carbon dust 35S after tapping is added in the present embodiment, whole double deoxidizers are added in 90S.
The product result of control group and four embodiment groups see the table below：
As can be seen from the above table, the entire oxygen content in the steel content of each embodiment group is significantly lower than control group, but has no effect on steel
Phosphorus content in water, deoxidation effect affirmative.And the ratio of steel inclusion rank≤1.5 is improved by 93.32% to 98.21%,
Continuous casting wadding flow rate is reduced to 0.32% by 1.03%, and finished product quality is improved.Deoxidation cost is down to for 14.23 yuan by ton steel
12.65 yuan；1.58 yuan of ton steel-deoxidizing cost reduction, deoxidation cost reduction effectively improves the benefit space of enterprise.
It should be noted that the present invention particular embodiment to the present invention have been described in detail, for ability
For the technical staff in domain, its various of progress is obviously changed without departing from the spirit and scope of the present invention
Become all within protection scope of the present invention.
Claims (1)
1. a kind of low cost pneumatic steelmaking deoxidization technique, which is characterized in that deoxidization technique step includes：
(1) simple substance carbon dust is added after tapping, it is 20s after tapping, simple substance carbon dust 60s time models after tapping that the time is added earliest
It is added in enclosing；Simple substance carbon dust addition is 0.17~0.58kg/t；
(2) after carbon dust adds interval 20s~30s, double deoxidizer is added, whole double deoxidizers are after tapping when 180s
Between add in range；The double deoxidizer ingredient include 40.5~49.3% silicon, 18.5~26.0% calcium, 27.7~
31.5% barium, 1 ~ 2% aluminium；Double deoxidizer addition is 1.2~1.8kg/t.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810829216.7A CN108998628B (en) | 2016-04-21 | 2016-04-21 | Low-cost deoxidation process for killed steel |
| CN201810829252.3A CN108588333B (en) | 2016-04-21 | 2016-04-21 | Low-cost deoxidation process for converter steelmaking |
| CN201610255520.6A CN105695664B (en) | 2016-04-21 | 2016-04-21 | A kind of low cost pneumatic steelmaking deoxidization technique |
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| CN201610255520.6A CN105695664B (en) | 2016-04-21 | 2016-04-21 | A kind of low cost pneumatic steelmaking deoxidization technique |
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| CN201810829252.3A Division CN108588333B (en) | 2016-04-21 | 2016-04-21 | Low-cost deoxidation process for converter steelmaking |
| CN201810829216.7A Division CN108998628B (en) | 2016-04-21 | 2016-04-21 | Low-cost deoxidation process for killed steel |
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| CN201810829252.3A Active CN108588333B (en) | 2016-04-21 | 2016-04-21 | Low-cost deoxidation process for converter steelmaking |
| CN201610255520.6A Active CN105695664B (en) | 2016-04-21 | 2016-04-21 | A kind of low cost pneumatic steelmaking deoxidization technique |
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| CN106906329B (en) * | 2017-04-06 | 2019-03-29 | 首钢集团有限公司 | A method of control bottom blowing gun for converter is exposed |
| CN109468432A (en) * | 2018-12-18 | 2019-03-15 | 南京钢铁股份有限公司 | A kind of method of deoxidation being suitable for carbon aluminium-killed steel |
| CN109880972B (en) * | 2019-04-01 | 2021-04-13 | 山东钢铁集团日照有限公司 | Production process of SPHC low-carbon steel |
| CN113234890A (en) * | 2021-04-20 | 2021-08-10 | 西峡飞龙特种铸造有限公司 | Composite deoxidizer and deoxidizing method for heat-resistant steel casting |
| CN114592104A (en) * | 2022-03-18 | 2022-06-07 | 马鞍山乌力平冶金技术工作室 | Method and device for deoxidizing in steelmaking end-point melt furnace |
| CN115287403A (en) * | 2022-08-15 | 2022-11-04 | 广东韶钢松山股份有限公司 | Low-carbon low-silicon cold heading steel deoxidation method |
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| CN1778974A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | Deoxidization of calcium-silicon barium for smelting 82B steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260827A (en) * | 2010-05-26 | 2011-11-30 | 攀钢集团钢铁钒钛股份有限公司 | Drill collar steel and preparation method thereof |
| CN102634641A (en) * | 2012-05-11 | 2012-08-15 | 武汉钢铁(集团)公司 | Deoxidation method for converter tapping molten steel |
| CN103074462A (en) * | 2013-02-01 | 2013-05-01 | 首钢水城钢铁（集团）有限责任公司 | Deoxidation method used in converter steelmaking process |
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| Publication number | Publication date |
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| CN108998628B (en) | 2020-05-15 |
| CN108998628A (en) | 2018-12-14 |
| CN105695664A (en) | 2016-06-22 |
| CN108588333A (en) | 2018-09-28 |
| CN108588333B (en) | 2020-05-15 |
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