CN106702090B - The method of vacuum pressure oxygen decarburization - Google Patents
The method of vacuum pressure oxygen decarburization Download PDFInfo
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- CN106702090B CN106702090B CN201611007457.0A CN201611007457A CN106702090B CN 106702090 B CN106702090 B CN 106702090B CN 201611007457 A CN201611007457 A CN 201611007457A CN 106702090 B CN106702090 B CN 106702090B
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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
- C21C7/068—Decarburising
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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
- C21C7/10—Handling in a vacuum
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Abstract
The present invention relates to the methods of oxygen decarburization, the in particular to method of vacuum pressure oxygen decarburization, belong to metallurgical technology field.Problems solved by the invention is the present invention provides a kind of method that vacuum forces oxygen decarburization, and the quick decarburization of this method energy improves production efficiency.The method that vacuum of the invention forces oxygen decarburization comprises the following steps that a. converter smelting；b.LF；c.RH；D. continuous casting；Wherein, RH blowing oxygen quantity is by [C] * 1.33+200~350ppm control of entering the station, and the RH vacuum that enters the station starts the cycle over and starts lower oxygen rifle, and vacuum degree≤10kPa starts oxygen blast, and oxygen blast process does not use pressure to control.Using the method for the present invention, the vacuum degree of control RH is not needed, apparatus and process is simple, and also creates the effect of quick decarburization, and decarburization efficiency is high, and decarburization effect is fine.
Description
Technical field
The present invention relates to the methods of oxygen decarburization, the in particular to method of vacuum pressure oxygen decarburization, belong to metallurgical technology
Field.
Background technique
For Xichang steel vanadium product orientation in high-quality, high added value kind, car panel steel is its primary development goal, but
From initial production quality with from the point of view of domestic and international advanced producer's comparative situation, it will be apparent that gap is that the control of product carbon content,
Project work carry out before, Xichang steel vanadium IF steel carbon content substantially between 0.0030%~0.0050% (finished product carbon≤
0.0020% ratio, can only far below the controlled level of the same period domestic advanced producer's finished product carbon≤0.0020% less than 40%)
The ultra-low-carbon steel production requirement for meeting general quality, is unable to satisfy the exploitation of car panel, high-quality electrical sheet.
During disclosing a kind of converter producing ultra-low-carbon steel application No. is 201510802460.0 Chinese patent application
The technical issues of RH carbonization treatment method, solution is to prevent converter process from producing RH insertion tube dry slag during ultra-low-carbon steel.
Application No. is 201110177807.9 Chinese patent applications to disclose a kind of RH refining process Rapid deep decarburization
Method uses decarbonization solvent to carry out oxygenation decarburization, after RH decarburization starts 7-10min, directly puts into from feeder pipe by oxygenation
Agent 80-94%, diffusant 5-15%, binder 1-5% composition decarburization flux enter RH vacuum chamber, in stability contorting molten steel
Carbon content.
Application No. is 201310482607.3 Chinese patent applications to disclose a kind of RH compound decarburization method, including following
Step: 1) RH decarburization oxygen supply takes solid oxygen to add to blow high pressure oxygen and combine mode and carry out decarburization；2) it is reached in vacuum indoor pressure
When to 20~25kPa, 0.1~3.0kg/ ton steel are added containing Fe2O3Solid ball；3) vacuum pressure is controlled in 10~15kpa,
0.1~3.0kg/ tons of steel are added and contain Fe2O3Solid ball；4) automatic vacuum；5) start to reduce top gun oxygen blast；6) oxygen blast early period
Lift gas flow；7) carbon reaches 100ppm hereinafter, stopping oxygen blast in steel；8) circulation, which terminates that sky can be broken, moves out.What it was solved
Technical problem is: realize quickly, steady, safely decarburization, be distributed in 1000 for producing carbon content of molten steel before RH decarburization~
2000ppm, finished product carbon are in 350ppm low-carbon special steel below.It needs oxygen blast and adds decarbonization solvent, also not publicly blows
The oxygen time.
Application No. is 201510802460.0 Chinese patent applications to disclose a kind of method that RH forces oxygen decarburization,
Oxygen blast processing is carried out after 5~7min of RH refining treatment, blowing oxygen quantity meets: [RH's [RH enter the station oxygen activity]+blowing oxygen quantity-enters the station carbon
Content] × 1.35=(150~300) ppm；And during oxygen blast, 9~11kpa of vacuum degree is adjusted.It can be made using this method
The low-down steel of carbon content, but need to control the vacuum degree of oxygen blast process using this method, vacuum degree decline process is slower, and one
Determine to extend the carbonization treatment time in degree, production efficiency is accordingly lower.
Summary of the invention
Problem to be solved by this invention is that the present invention provides a kind of methods that vacuum forces oxygen decarburization.This method energy
Quick decarburization improves production efficiency.
In order to solve the above technical problems, the method that vacuum of the invention forces oxygen decarburization comprises the following steps that a. converter
It smelts；b.LF；c.RH；D. continuous casting；
Wherein, RH blowing oxygen quantity is by [C] * 1.33+200~350ppm control of entering the station, and the RH vacuum that enters the station starts the cycle over and starts
Lower oxygen rifle, vacuum degree≤10kPa start oxygen blast, and oxygen blast process does not use pressure to control.
Further, converter smelting described in a step, aim carbon 0.05%~0.08%, oxygen activity 400ppm~
700ppm。
Preferably, 1610 DEG C~1625 DEG C of step c RH inlet temperature.
Preferably, 12~15min of VCD after step c oxygen blast.
Further, step c oxygen blow duration≤5min.
Preferably, RH enters the station carbon content 0.06%~0.08%.
Preferably, RH enters the station oxygen activity 382ppm~492ppm.
Beneficial effects of the present invention: the present invention provides a kind of method that vacuum forces oxygen decarburization, this method is from converter
The control of aim carbon oxygen, RH blowing oxygen quantity, RH oxygen blast moment control etc. starts with, with reach further decrease vacuum VCD after carbon content
Purpose.In addition, not needing the vacuum degree of control RH using the method for the present invention, apparatus and process is simple, and also creates quickly de-
The effect of carbon, decarburization efficiency are high, under equal conditions, decarburization effect than application No. is 201510802460.0 Chinese patents also
It is good.
Specific embodiment
The method that vacuum of the present invention forces oxygen decarburization includes the following steps:
A. converter smelting；b.LF；c.RH；D. continuous casting；
Wherein, RH blowing oxygen quantity is by [C] * 1.33+200~350ppm control of entering the station, and the RH vacuum that enters the station starts the cycle over and starts
Lower oxygen rifle, vacuum degree≤10kPa start oxygen blast, and oxygen blast process does not use pressure to control.
Further, converter smelting described in a step, aim carbon 0.05%~0.08%, oxygen activity 400ppm~
700ppm。
Preferably, 1610 DEG C~1625 DEG C of step c RH inlet temperature.
Preferably, 12~15min of VCD after step c oxygen blast.
Further, step c oxygen blow duration≤5min.
Preferably, RH enters the station carbon content 0.06%~0.08%.
Preferably, RH enters the station oxygen activity 382ppm~492ppm.
A specific embodiment of the invention is further described below with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described range.
Embodiment 1
It carries out just making steel water as raw material using the half steel after hot metal containing V-Ti vanadium extraction desulfurization, wherein half steel percentage by weight
Than count comprising 3.41% C, 0.041% Mn, 0.062% P, 0.003% S, 0.04% V and trace Cr,
Si and Ti, surplus are iron and inevitable impurity.
Specific steps:
(1) 231 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacity), are turned using top and bottom complex blowing
Above-mentioned half steel is just smelt molten steel by the function of furnace oxygen decarburization.It is that 0.058wt%, Mn content are when molten steel is just refined to C content
When 0.032wt%, P content 0.0081wt%, S content are 0.0051wt%, temperature is 1671 DEG C, start dry slag into ladle
Tapping.
(2) chain-wales carry out Argon processing, out 1601 DEG C of chain-wales temperature.
(3) in LF furnace to above-mentioned molten steel carry out heated for controlling temperature, 1625 DEG C of out-station temperature.
(4) RH inlet temperature is 1615 DEG C, and the oxygen activity that enters the station is 492ppm, and the carbon content that enters the station is 0.051%.
(5) vacuum, which starts the cycle over, starts lower oxygen rifle, and vacuum degree is down to 9.8kPa and starts oxygen blast, and oxygen blast process does not use pressure
Power control, blowing oxygen quantity 190ppm, oxygen blow duration 3.6min.
(6) continue VCD decarburization 13min after oxygen blast.
Inspection by sampling after VCD, mean carbon content is 18ppm after carbon content 11ppm, the same period general decarbonization process VCD.
Embodiment 2
It carries out just making steel water as raw material using the half steel after hot metal containing V-Ti vanadium extraction desulfurization, wherein half steel percentage by weight
Include 3.52% C, 0.05% Mn, 0.062% P, 0.002% S, 0.04% V and Cr, Si of trace than meter
And Ti, surplus are iron and inevitable impurity.
Specific steps:
(1) 233 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacity), are turned using top and bottom complex blowing
Above-mentioned half steel is just smelt molten steel by the function of furnace oxygen decarburization.It is that 0.066wt%, Mn content are when molten steel is just refined to C content
When 0.033wt%, P content 0.0085wt%, S content are 0.0046wt%, temperature is 1668 DEG C, start dry slag into ladle
Tapping.
(2) chain-wales carry out Argon processing, out 1598 DEG C of chain-wales temperature.
(3) in LF furnace to above-mentioned molten steel carry out heated for controlling temperature, 1627 DEG C of out-station temperature.
(4) RH inlet temperature is 1619 DEG C, and the oxygen activity that enters the station is 402ppm, and the carbon content that enters the station is 0.061%.
(5) vacuum, which starts the cycle over, starts lower oxygen rifle, and vacuum degree is down to 9.9kPa and starts oxygen blast, and oxygen blast process does not use pressure
Power control, blowing oxygen quantity 240ppm, oxygen blow duration 4.1min.
(6) continue VCD decarburization 12min after oxygen blast.
Inspection by sampling after VCD, mean carbon content is 18ppm after carbon content 9ppm, the same period general decarbonization process VCD.
Embodiment 3
It carries out just making steel water as raw material using the half steel after hot metal containing V-Ti vanadium extraction desulfurization, wherein half steel percentage by weight
Include 3.42% C, 0.04% Mn, 0.065% P, 0.004% S, 0.04% V and Cr, Si of trace than meter
And Ti, surplus are iron and inevitable impurity.
Specific steps:
(1) 236 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacity), are turned using top and bottom complex blowing
Above-mentioned half steel is just smelt molten steel by the function of furnace oxygen decarburization.It is that 0.076wt%, Mn content are when molten steel is just refined to C content
When 0.032wt%, P content 0.0082wt%, S content are 0.0055wt%, temperature is 1666 DEG C, start dry slag into ladle
Tapping.
(2) chain-wales carry out Argon processing, out 1589 DEG C of chain-wales temperature.
(3) in LF furnace to above-mentioned molten steel carry out heated for controlling temperature, 1617 DEG C of out-station temperature.
(4) RH inlet temperature is 1612 DEG C, and the oxygen activity that enters the station is 382ppm, and the carbon content that enters the station is 0.032%.
(5) vacuum, which starts the cycle over, starts lower oxygen rifle, and vacuum degree is down to 9.8kPa and starts oxygen blast, and oxygen blast process does not use pressure
Power control, blowing oxygen quantity 300ppm, oxygen blow duration 3.2min.
(6) continue VCD decarburization 15min after oxygen blast.
Inspection by sampling after VCD, mean carbon content is 18ppm after carbon content 8ppm, the same period general decarbonization process VCD.
Comparative example
It carries out just making steel water as raw material using the half steel after hot metal containing V-Ti vanadium extraction desulfurization, wherein half steel percentage by weight
Include 3.42% C, 0.04% Mn, 0.065% P, 0.004% S, 0.04% V and Cr, Si of trace than meter
And Ti, surplus are iron and inevitable impurity.
Specific steps:
(1) 236 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacity), are turned using top and bottom complex blowing
Above-mentioned half steel is just smelt molten steel by the function of furnace oxygen decarburization.It is that 0.076wt%, Mn content are when molten steel is just refined to C content
When 0.032wt%, P content 0.0082wt%, S content are 0.0055wt%, temperature is 1666 DEG C, start dry slag into ladle
Tapping.
(2) chain-wales carry out Argon processing, out 1589 DEG C of chain-wales temperature.
(3) in LF furnace to above-mentioned molten steel carry out heated for controlling temperature, 1617 DEG C of out-station temperature.
(4) RH inlet temperature is 1612 DEG C, and the oxygen activity that enters the station is 382ppm, and the carbon content that enters the station is 0.032%.
(5) after RH handles 6min, pressure 3mbar, then vacuum degree is slowly adjusted to 10kPa, oxygen blast is carried out, blowing oxygen quantity is
200ppm, oxygen blow duration 6min.
(6) continue VCD decarburization 15min after oxygen blast.
Inspection by sampling after VCD, carbon content 14ppm.
Handling the RH carbon content that enters the station by the embodiment of the present invention 1 and 2 is respectively 0.051%, 0.061%, in final molten steel
Carbon content can arrive separately at 11ppm, 9ppm；And application No. is the Examples 1 and 2 of 201510802460.0 Chinese patent application
Compare the carbon content difference 0.035%, 0.038% as can be seen that RH enters the station, and carbon content can arrive separately in final molten steel
11ppm, 13ppm, it is seen that more preferable using technical solution of the present invention decarburization effect.
In addition, the RH carbon content that enters the station is identical it can be seen from the comparison of the embodiment of the present invention 3 and comparative example, using this hair
The steel carbon content 8ppm that bright technical solution is prepared, lower than the 14ppm of comparative example, oxygen blow duration is less.
Claims (9)
1. the method for vacuum pressure oxygen decarburization, which comprises the steps of: a. converter smelting；b.LF；c.RH；d.
Continuous casting；
Wherein, RH blowing oxygen quantity is by [C] * 1.33+200~350ppm control of entering the station, and the RH vacuum that enters the station starts the cycle over and starts lower oxygen
Rifle, vacuum degree≤10kPa start oxygen blast, and oxygen blast process does not use pressure to control；Step c oxygen blow duration≤5min.
2. the method that vacuum according to claim 1 forces oxygen decarburization, which is characterized in that converter smelting described in a step
Refine carbon content 0.05%~0.08%, oxygen activity 400ppm~700ppm.
3. the method that vacuum according to claim 1 or 2 forces oxygen decarburization, which is characterized in that step c RH inlet temperature
1610 DEG C~1625 DEG C.
4. the method that vacuum according to claim 1 or 2 forces oxygen decarburization, which is characterized in that after step c oxygen blast
VCD12~15min.
5. the method that vacuum according to claim 3 forces oxygen decarburization, which is characterized in that VCD 12 after step c oxygen blast
~15min.
6. the method that vacuum according to claim 1 or 2 forces oxygen decarburization, which is characterized in that the RH enters the station carbon
Content 0.06%~0.08%.
7. the method that vacuum according to claim 3 forces oxygen decarburization, which is characterized in that the RH enters the station carbon content
0.06%~0.08%.
8. the method that vacuum according to claim 1 or 2 forces oxygen decarburization, which is characterized in that the RH enters the station oxygen
Activity 382ppm~492ppm.
9. the method that vacuum according to claim 3 forces oxygen decarburization, which is characterized in that the RH enters the station oxygen activity
382ppm~492ppm.
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| JP2003096515A (en) * | 2001-09-20 | 2003-04-03 | Nippon Steel Corp | Method for refining molten extra-low carbon chromium- containing steel |
| CN105316451A (en) * | 2015-11-19 | 2016-02-10 | 攀钢集团西昌钢钒有限公司 | RH forced oxygen blowing decarbonization method and ultra-low-carbon steel smelting method |
| CN105331777A (en) * | 2015-11-27 | 2016-02-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Ruhstahl hausen (RH) deep decarburization method for high-altitude area |
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Effective date of registration: 20201207 Address after: 617000 No. 90 Taoyuan street, Eastern District, Sichuan, Panzhihua Patentee after: SICHUAN PAN YAN TECHNOLOGY Co.,Ltd. Address before: 617000 No. 90 Taoyuan street, Eastern District, Sichuan, Panzhihua Patentee before: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. |
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