CN106399641B - A kind of method RH quick decarburization and reduce temperature drop - Google Patents
A kind of method RH quick decarburization and reduce temperature drop Download PDFInfo
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- CN106399641B CN106399641B CN201610973985.5A CN201610973985A CN106399641B CN 106399641 B CN106399641 B CN 106399641B CN 201610973985 A CN201610973985 A CN 201610973985A CN 106399641 B CN106399641 B CN 106399641B
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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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- 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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of quick decarburizations of RH and the methods for reducing temperature drop, belong to technical field of ferrous metallurgy.The quick decarburization of the RH and the method for reducing temperature drop include：Converter smelting endpoint carries out catch carbon practice；Enter RH after converter tapping to refine, RH refinings start oxygen blast and carry out pressure decarburization early period；After forcing decarburization, continue oxygen blast into the second-time burning stage, ladder distribution is presented according to RH C content differences of arriving at a station in the oxygen blast flow in second-time burning stage, and temperature drop compensation is carried out by burning the CO gases heat release that generates.Using the above method, carbon content can be taken off to 0.0015% in 15min hereinafter, RH arrives at a station and breaks air temperature drop control within 15 DEG C to RH simultaneously.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, more particularly to the quick decarburization of a kind of RH and the side for reducing temperature drop
Method.
Background technology
With the fast development of auto industry, low-carbon and ultralow carbon cold-rolled steel plate demand increase year by year at present.The country smelts
The main technique that low-carbon and ultralow carbon cold-rolled steel plate are taken is that converter-vacuum circulation refining stove refines (RH refinings)-continuous casting, with
For ultra-low-carbon steel, most of RH refinery practices use nature decarbonization process, and [C] is removed to 15~20ppm hereinafter, decarburization knot
Al, Ti alloyings are added after beam.At present the country steel mill during smelting low carbon and ultralow carbon cold-rolled steel plate, in the prevalence of turn
In the problems such as period is long, RH temperature drops are big of standing, these problems directly result in Tapping Temperature of Bof height and then make by stove outlet temperature height, RH
It obtains converter terminal dissolved oxygen and clinker TFe contents is high, brought a negative impact for the control of subsequent cleanliness factor.And between these problems
There is inherent logical relations again：RH directly results in that RH refining process temperature drops are big in station period length, and RH refining process is big
Temperature drop makes up may require that high converter terminal temperature.And it influences RH and is that RH was refined in the important link in station period
The decarbonization rate of journey, decarbonization rate height mean that the period is short, RH temperature drops are few, and final converter terminal temperature is low.It is how fast using RH
Fast decarburization reduces temperature drop simultaneously is becoming the significant challenge that RH refinings face.
Invention content
The purpose of the present invention is to provide a kind of quick decarburizations of RH and the methods for reducing temperature drop, solve the prior art
Present in RH refining process decarbonization rates are low, RH temperature drops are big technical problem.
In order to solve the above technical problems, the present invention provides following technical solutions：
A kind of method RH quick decarburization and reduce temperature drop, including：
Converter smelting endpoint carries out catch carbon practice；
Enter RH after converter tapping to refine, RH refinings start oxygen blast and carry out pressure decarburization early period；
After forcing decarburization, continue oxygen blast, the oxygen blast flow root in second-time burning stage into the second-time burning stage
Ladder distribution is presented according to RH C content differences of arriving at a station, the CO gases heat release generated carries out temperature drop compensation by burning.
Further, the converter smelting endpoint carries out catch carbon practice, including：Endpoint carbon content of converter is controlled 0.06
~0.08%.
Further, two stages of the pressure decarburization and second-time burning use identical rifle position.
Further, RH refining starts oxygen blast early period and force the decarburization to be specially：When RH vacuum degrees reach
Oxygen blast is proceeded by when 180mbar.
Further, described to force that blowing oxygen quantity and the RH of decarburization arrive at a station C content and the RH O contents that arrive at a station meet following relationship：Y
=-0.15*M+2000*N+29；
Wherein, Y represents blowing oxygen quantity, m3；M represents RH and arrives at a station O content, ppm；N represents RH and arrives at a station the mass percentage of C.
Further, the oxygen blast flow in the second-time burning stage according to RH arrive at a station C content it is different present (900~
1200)-(500~800)-(200~500)-(0~300) Nm3The ladder-like distributions of/h, each stage oxygen blow duration are 40s.
Further, RH is carried out by the method and handles 15min, RH terminates C content as 0.0015% hereinafter, RH arrives at a station
Air temperature drop control is broken within 15 DEG C to RH.
Further, the method is suitable for smelting the mass fraction requirement of final finished carbon content below 0.0060%
Steel grade.
Further, the method is suitable for 100-300 tons of RH refining furnaces.
The one or more technical solutions provided in the embodiment of the present invention, have at least the following technical effects or advantages：
The quick decarburizations of RH provided in the embodiment of the present invention and the method for reducing temperature drop, by taking converter smelting whole
Point carries out catch carbon practice, obtains higher endpoint carbon content to force decarburization to create conditions for RH；Enter after converter tapping
RH is refined, and RH refinings start oxygen blast and carry out pressure decarburization early period, by oxygen decarburization opportunity in advance to reach quick decarburization early period
Purpose；After forcing decarburization, continue oxygen blast into the second-time burning stage, the oxygen blast flow in second-time burning stage according to
Ladder distribution is presented in RH C content differences of arriving at a station, and by burning, the CO gases heat release generated carries out temperature drop compensation.In this way, solving
RH refining process decarbonization rate existing in the prior art is low, RH temperature drops are big technical problem, and then obtaining RH can be
Carbon content is taken off to 0.0015% in 15min hereinafter, RH arrives at a station and breaks technology effect of the air temperature drop control within 15 DEG C to RH simultaneously
Fruit.
Specific implementation mode
Method of the embodiment of the present invention by a kind of RH of offer quick decarburizations and reducing temperature drop, solves the prior art
Present in RH refining process decarbonization rates are low, RH temperature drops are big technical problem；RH decarbonization rates can be effectively improved, are dropped simultaneously
Low RH temperature losses of the process.
In order to solve the above technical problems, general thought of the embodiment of the present invention is as follows：
A kind of quick decarburization of RH and the method for reducing temperature drop are provided, including：
Converter smelting endpoint carries out catch carbon practice；
Enter RH after converter tapping to refine, RH refinings start oxygen blast and carry out pressure decarburization early period；
After forcing decarburization, continue oxygen blast, the oxygen blast flow root in second-time burning stage into the second-time burning stage
Ladder distribution is presented according to RH C content differences of arriving at a station, the CO gases heat release generated carries out temperature drop compensation by burning.
Through the above as can be seen that by taking converter smelting endpoint to carry out catch carbon practice, higher end is obtained
Point carbon content for RH to force decarburization to create conditions；Enter RH after converter tapping to refine, RH, which is refined, starts oxygen blast progress early period
Decarburization is forced, by oxygen decarburization opportunity in advance to achieve the purpose that quick decarburization early period；After forcing decarburization, entrance is secondary
Combustion phases continues oxygen blast, and ladder distribution is presented according to RH C content differences of arriving at a station in the oxygen blast flow in second-time burning stage, leads to
The CO gases heat release that burning generates is crossed to carry out temperature drop compensation.In this way, it is de- to solve RH refining process existing in the prior art
The technical problem that carbon rate is low, RH temperature drops are big.
Using the above method, following technique effect can be obtained：RH can take off carbon content to 0.0015% in 15min
Hereinafter, simultaneously RH arrive at a station to RH break air temperature drop control within 15 DEG C.
In order to better understand the above technical scheme, being done to technical solution of the present invention below by specific embodiment detailed
Explanation, it should be understood that the specific features in the embodiment of the present invention and embodiment be to technical solution of the present invention specifically
It is bright, rather than to the restriction of technical solution of the present invention, in the absence of conflict, the skill in the embodiment of the present invention and embodiment
Art feature can be combined with each other.
The embodiment of the present invention provides a kind of quick decarburization of RH and the method for reducing temperature drop, be mainly used for smelting finally at
The mass fraction of product carbon content requires, in 0.0060% steel grade below, to be suitable for 100-300 tons of RH refining furnaces, the method packet
It includes：
Converter smelting endpoint carries out catch carbon practice；
Enter RH after converter tapping to refine, RH refinings start oxygen blast and carry out pressure decarburization early period；
After forcing decarburization, continue oxygen blast, the oxygen blast flow root in second-time burning stage into the second-time burning stage
Ladder distribution is presented according to RH C content differences of arriving at a station, the CO gases heat release generated carries out temperature drop compensation by burning.
In the embodiment of the present invention, converter smelting endpoint carries out catch carbon practice, including：Control endpoint carbon content of converter exists
0.06~0.08%.
In the embodiment of the present invention, RH oxygen blast processes are divided into two stages of decarburization and second-time burning of pressure, and using identical
Rifle position.
In the embodiment of the present invention, RH refining early period start oxygen blast carry out force decarburization be specially：When RH vacuum degrees reach
Oxygen blast is proceeded by when 180mbar.Selection vacuum degree proceeds by oxygen blast when reaching 180mbar be because when vacuum degree is excessive
Molten steel fails fully to recycle, and the quick decarburizing phase of early period will be avoided when vacuum degree is too small, is unable to reach quick decarburization
Effect.
In the embodiment of the present invention, force that the blowing oxygen quantity of decarburization and RH arrive at a station C content and the RH O contents that arrive at a station meet such as ShiShimonoseki
System：Y=-0.15*M+2000*N+29；
Wherein, Y represents blowing oxygen quantity, m3；M represents RH and arrives at a station O content, ppm；N represents the arrive at a station quality percentages of C of RH and contains
Amount, %.
It is to terminate oxygen content according to decarburization to be designed by 190ppm to force decarburization blowing oxygen quantity, and in view of dissolved oxygen in molten steel
Increase and finally determine, can ensure the blowing oxygen quantity needed for carbon burning, to abundant decarburization.
In the embodiment of the present invention, the oxygen blast flow in second-time burning stage according to RH arrive at a station C content it is different present (900~
1200)-(500~800)-(200~500)-(0~300) Nm3The ladder-like distributions of/h, each stage oxygen blow duration are 40s.
The oxygen blast uninterrupted in each stage is different and different according to RH C contents of arriving at a station, when RH arrive at a station C content it is high when, it is right
The CO amounts that should be generated are high, it is therefore desirable to which the oxygen blast flow of bigger burns to CO.Such as：When RH C contents of arriving at a station are
When 0.04%, the flow of second-time burning oxygen blast at this time is generally according to 900-500-200-60Nm3The ladder-like distributions of/h；When RH arrives at a station C
When content is 0.06%, the flow of second-time burning oxygen blast at this time is generally according to 1200-800-500-300Nm3The ladder-like distributions of/h.It blows
The oxygen time, it was about 160s to need the time of burning CO, and oxygen blast flow is ladder-like according to four-stage mainly according to exhaust gas curve
Distribution, each phases-time are 40s.Overlong time causes ladder few, and bad with exhaust gas curves, the time is too short, in reality
Oxygen lance operation is not easily controlled in production.
Through the above as can be seen that the embodiment of the present invention and the difference of tradition RH decarbonizing process are primarily present with lower section
Face：1) converter smelting endpoint carries out catch carbon practice, and for the control of terminal C content 0.06~0.08%, the traditional handicraft that compares is whole
Point carbon content wants high, forces decarburization to create conditions for RH；2) RH refining process is divided into and forces two ranks of decarburization and second-time burning
Section, RH start oxygen blast when refining vacuum degree early period reaches 180mbar, and RH pressure oxygen decarburization opportunitys are shifted to an earlier date, RH is made full use of
The characteristics of forcing decarburization oxygen content early period to be the rate controlling link of decarburization, carries out quick decarburization；3) pressure decarburization oxygen blast terminates laggard
Enter the second-time burning stage, oxygen blast is continued using step's flux according to RH C contents of arriving at a station, the CO subsequently generated is simultaneously put to burn
Heat is to compensate temperature drop.
Using the above method, following technique effect can be obtained：RH can take off carbon content to 0.0015% in 15min
Hereinafter, simultaneously RH arrive at a station to RH break air temperature drop control within 15 DEG C.
It is for a more detailed description to the present invention by the following examples.These embodiments are only to the best embodiment party of the present invention
The description of formula does not have the scope of the present invention any limitation.
Following embodiment is refined using 210 tons of RH refining furnaces.
Embodiment 1
1) converter smelting endpoint carries out catch carbon practice, and endpoint carbon content of converter forces decarburization to be created 0.06%, for RH
Condition.
2) RH oxygen blast process is divided into two stages of decarburization and second-time burning of pressure, is all made of 6.6m rifle positions.
3) RH arrives at a station 1624 DEG C of temperature, and C content of arriving at a station is 0.04%, and the O content that arrives at a station is 400ppm, when RH vacuum degrees reach
Start oxygen blast when 180mbar, oxygen blast flow is 2000Nm3/ h, blowing oxygen quantity 49m3。
4) it forces to enter the second-time burning stage after decarburization, second-time burning is divided into 4 stages, and oxygen blast flow is according to 900-
500-200-100Nm3The ladder-like distributions of/h, each stage oxygen blow duration are 40s.
5) RH end temps are 1610 DEG C, and when RH processing time 15min, it is 0.0012% that RH, which terminates C content,.
Embodiment 2
1) converter smelting endpoint carries out catch carbon practice, and endpoint carbon content of converter 0.07% forces decarburization to be created for RH
Condition.
2) RH oxygen blast process is divided into two stages of decarburization and second-time burning of pressure, is all made of 6.6m rifle positions.
3) RH arrives at a station 1621 DEG C of temperature, and C content of arriving at a station is 0.05%, and the O content that arrives at a station is 400ppm, when RH vacuum degrees reach
Start oxygen blast when 180mbar, oxygen blast flow is 2000Nm3/ h, blowing oxygen quantity 69m3。
4) force to enter the second-time burning stage after decarburization, second-time burning is divided into 4 stages, oxygen blast flow according to
1000-600-300-200Nm3The ladder-like distributions of/h, each stage oxygen blow duration are 40s.
5) RH end temps are 1608 DEG C, and when RH processing time 15min, it is 0.0013% that RH, which terminates C content,.
Embodiment 3
1) converter smelting endpoint carries out catch carbon practice, and endpoint carbon content of converter 0.08% forces decarburization to be created for RH
Condition.
2) RH oxygen blast process is divided into two stages of decarburization and second-time burning of pressure, is all made of 6.6m rifle positions.
3) RH arrive at a station temperature be 1619 DEG C, C content of arriving at a station be 0.06%, the O content that arrives at a station be 400ppm, when RH vacuum degrees reach
Start oxygen blast when to 180mbar, oxygen blast flow is 2000Nm3/ h, blowing oxygen quantity 88m3。
4) force to enter the second-time burning stage after decarburization, second-time burning is divided into 4 stages, oxygen blast flow according to
1100-700-400-300Nm3The ladder-like distributions of/h, each stage oxygen blow duration are 40s.
5) RH end temps are 1609 DEG C, and when RH processing time 15min, it is 0.0015% that RH, which terminates C content,.
The one or more technical solutions provided in the embodiment of the present invention, have at least the following technical effects or advantages：
The quick decarburizations of RH provided in the embodiment of the present invention and the method for reducing temperature drop, by taking converter smelting whole
Point carries out catch carbon practice, obtains higher endpoint carbon content to force decarburization to create conditions for RH；Enter after converter tapping
RH is refined, and RH refinings start oxygen blast and carry out pressure decarburization early period, by oxygen decarburization opportunity in advance to reach quick decarburization early period
Purpose；After forcing decarburization, continue oxygen blast into the second-time burning stage, the oxygen blast flow in second-time burning stage according to
Ladder distribution is presented in RH C content differences of arriving at a station, and by burning, the CO gases heat release generated carries out temperature drop compensation.In this way, solving
RH refining process decarbonization rate existing in the prior art is low, RH temperature drops are big technical problem, and then obtaining RH can be
Carbon content is taken off to 0.0015% in 15min hereinafter, RH arrives at a station and breaks technology effect of the air temperature drop control within 15 DEG C to RH simultaneously
Fruit.
It should be noted last that the above specific implementation mode is merely illustrative of the technical solution of the present invention and unrestricted,
Although being described the invention in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit of the technical scheme of the invention and range, should all cover
In the scope of the claims of the present invention.
Claims (6)
1. a kind of method RH quick decarburization and reduce temperature drop, which is characterized in that including：
Converter smelting endpoint carries out catch carbon practice；
Enter RH after converter tapping to refine, RH refinings start oxygen blast when vacuum degree reaches 180mbar and carry out pressure decarburization early period；
After forcing decarburization, continue oxygen blast into the second-time burning stage, the oxygen blast flow in second-time burning stage is according to RH
Ladder distribution is presented in C content of arriving at a station difference, and temperature drop compensation is carried out by the CO gases heat release for generation of burning；
Wherein, described to force that blowing oxygen quantity and the RH of decarburization arrive at a station C content and the RH O contents that arrive at a station meet following relationship：Y=-0.15*
M+2000*N+29；Wherein, Y represents blowing oxygen quantity, m3；M represents RH and arrives at a station O content, ppm；N represents the arrive at a station quality percentages of C of RH and contains
Amount；
The oxygen blast flow in the second-time burning stage according to RH arrive at a station C content it is different present (900~1200)-(500~
800)-(200~500)-(0~300) Nm3The ladder-like distributions of/h, each stage oxygen blow duration are 40s.
2. method RH as described in claim 1 quick decarburization and reduce temperature drop, which is characterized in that the converter smelting
Terminal carries out catch carbon practice, including：Endpoint carbon content of converter is controlled 0.06~0.08%.
3. method RH as described in claim 1 quick decarburization and reduce temperature drop, which is characterized in that the pressure decarburization
Identical rifle position is used with two stages of second-time burning.
4. method RH as described in claim 1 quick decarburization and reduce temperature drop, which is characterized in that pass through the method
It carries out RH and handles 15min, RH terminates C content as 0.0015% hereinafter, RH arrives at a station breaks air temperature drop control within 15 DEG C to RH.
5. method RH as described in claim 1 quick decarburization and reduce temperature drop, which is characterized in that the method is applicable in
It is required in 0.0060% steel grade below in the mass fraction for smelting final finished carbon content.
6. method RH as described in claim 1 quick decarburization and reduce temperature drop, which is characterized in that the method is applicable in
In 100-300 tons of RH refining furnaces.
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| CN113073174B (en) * | 2020-01-06 | 2022-02-18 | 兰州理工大学 | Method for reducing steel slag adhesion in ultra-low carbon steel smelting process |
| CN112011670B (en) * | 2020-08-20 | 2022-06-28 | 邯郸钢铁集团有限责任公司 | Method for improving decarburization rate of ultra-low carbon steel RH refining and side-blowing device |
| CN113025784B (en) * | 2021-02-07 | 2022-08-05 | 首钢集团有限公司 | Smelting method of ultra-low carbon steel for automobile |
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