CN107287490B - Boron-containing steel smelting process method for improving boron yield - Google Patents
Boron-containing steel smelting process method for improving boron yield Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 126
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 109
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 94
- 239000010959 steel Substances 0.000 title claims abstract description 94
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000003723 Smelting Methods 0.000 title claims abstract description 37
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000010079 rubber tapping Methods 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 33
- 238000007664 blowing Methods 0.000 claims abstract description 26
- 229910052786 argon Inorganic materials 0.000 claims abstract description 20
- 238000005275 alloying Methods 0.000 claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 239000004571 lime Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 238000007872 degassing Methods 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000013019 agitation Methods 0.000 claims description 2
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical compound [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000003756 stirring Methods 0.000 abstract description 7
- 239000003607 modifier Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000914 Mn alloy Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910000712 Boron steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000979 O alloy Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- -1 calcium carbides Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The application discloses a boron-containing steel smelting process method for improving the boron yield, which sequentially comprises the following process flows of: s1, in the converter process, alloy is added in the steel tapping process for deoxidation alloying, slag modifier and lime are added to the slag surface of the steel ladle after the steel tapping is finished to control the components and oxygen potential of the slag, argon is blown in the whole process of the bottom of the steel ladle in the steel tapping process, and molten steel is kept stirring but is not violently overturned; s2, a VOD process, wherein after the converter process is finished, the molten steel is transported to a VOD for processing, after the ladle is transferred to a proper position, bottom blowing is switched on, vacuumizing processing is started, high vacuum is kept for degassing and removing impurities, ferroboron is added at the later stage of the VOD process, high vacuum circulation is kept after the ferroboron is added, and finally the molten steel is transported out for a continuous casting process; and S3, in the continuous casting process, protective casting is adopted to prevent nitrogen increase and secondary oxidation of molten steel. The method has the advantages of short process flow, low production cost, simple operation, high yield of boron element and stable boron content in the molten steel.
Description
Technical field
The application belongs to steelmaking technical field, in particular to a kind of boron-containing steel smelting process method for improving boron recovery rate.
Background technique
Boron element is very competent to steel hardenability improvement, and micro boron can exponentially increase the harden ability of steel.In steel
0.0010%~0.0030% boron element effect can be respectively equivalent to 0.6% manganese, 0.7% chromium, 0.5% molybdenum and 1.5% nickel, because
This, improves the ability of harden ability as the hundred times of above-mentioned alloying element or even thousands of times, only needs minute quantity boron that can save greatly
The expensive alloying elements of amount.With it, the content in steel increases and increases the effect of general alloying element raising harden ability, but in steel
Boron have an optimum content, it is excessive or very few unfavorable to harden ability is improved, and content very little, about 0.0010%, one
As control 0.0005%~0.0030%.
Micro boron element can change the harden ability of steel, this is boron element biggest advantage, while be also one main scarce
Point, because steel are all very sensitive to the minor change of boron content.Therefore, steelmaking process needs strict control boron content, keeps it steady
It is scheduled in the content range of steel grade demand.The additional amount of boron element is higher than 0.0010% in actual production, is primarily due to boron element
More active, the elements such as it and oxygen, nitrogen have very strong affinity, and boron oxide easy to form, boron nitride etc. lose boron element
Effect, it cannot be guaranteed that the harden ability of steel.When smelting boron-containing steel, strict control steel water oxygen, nitrogen content are needed, receiving for boron is improved
Rate stablizes boron content, and then the through hardening performance of stabilized steel.
Boron-containing steel smelting process route multiplicity, the generally existing molten steel of existing boron-containing steel smelting technique, the control of clinker oxygen gesture are not
The problems such as N content is higher in stable or molten steel, keeps the control of the effective boron element of steel grade unstable, to the performance of temperature boron-containing steel
It is totally unfavorable.In order to stablize the quality of boron-containing steel, while smelting cost is reduced, further research improves boron-containing steel boron element and receives
The smelting process method of rate has great importance.
Summary of the invention
The purpose of the present invention is to provide a kind of boron-containing steel smelting process methods for improving boron recovery rate, to solve existing skill
When art smelts boron-containing steel there are the problem of, be that a kind of process flow is short, production cost is low, behaviour for other opposite smelting techniques
Make that simple, boron element recovery rate is high and in molten steel boron content it is stable plus boron steel smelting process.
To achieve the above object, the invention provides the following technical scheme:
The embodiment of the present application discloses a kind of boron-containing steel smelting process method for improving boron recovery rate, and process flow is successively wrapped
It includes:
Alloy is added in tapping process and carries out deoxidation alloying for S1, kiln process, and tapping adds after terminating to ladle slag face
Enter slag adjusting agent and lime to control slag composition, oxygen gesture, the tapping process ladle bottom whole process blowing argon gas keeps molten steel to stir
It is dynamic, but do not seethe acutely；
Molten steel is transported to VOD after the kiln process and is handled by S2, VOD process, and ladle allocation and transportation are followed by place
Logical bottom blowing, starts vacuumize process, keeps high vacuum to be de-gassed, go to be mingled with, ferro-boron is added in the VOD process later period, institute
It states and continues to keep high vacuum circulation after ferro-boron is added, molten steel is finally transferred out into carry out continuous casting process；
S3, continuous casting process take protective casting, prevent molten steel nitrogen pick-up, secondary oxidation.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, the tapping process temperature is big
In 1650 DEG C.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, the amount of the slag adjusting agent is added
For 1.5~5.5kg/t, the amount that the lime is added is 2.0~4.0kg/t, and the argon flow control is 80~200NL/
min。
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, the alloy and slag adjusting agent are complete
Portion continues to keep blowing argon gas after adding, and the time is greater than 3min.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, when the molten steel is transported to VOD
Temperature is greater than 1610 DEG C, content T.Fe+MnO≤2.0% in the clinker.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, vacuum degree during the VOD
50Pa is maintained at hereinafter, the bottom blowing flow is 5~50NL/min, the bottom blown gas is argon gas, hydrogen gas mixture, the two
Ratio is respectively 70%~90%: 10%~30%.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, the degassing time is greater than
15min, ferro-boron continue high vacuum 5min or more after being added.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, the granularity of the slag adjusting agent is
40~70mm, ingredient are as follows: Al 30~45%, Ca 3~10%, CaO 25~35%, Al2O315~20%, CaF25~
10%, impurity.
Preferably, in the boron-containing steel smelting process method of above-mentioned raising boron recovery rate, the ferro-boron additional amount is
0.115-0.124kg/t。
The principle of smelting process of the present invention is as follows:
By strict implement boron-containing steel Steelmaking working specification, stablizes smelting process parameter, make molten steel, clinker oxygen
Potential drop significantly improves boron element recovery rate, compared with original technique, shortens smelting process process, stablize to lower level
The content of boron element in boron-containing steel.The tapping of converter high temperature, is done directly deoxidation alloying and slag making in tapping process, can cancel
LF station avoids the high problem of LF long time treatment molten steel gas content, while shortening smelting process process, improves production
Efficiency reduces production cost；Molten steel, which is allocated and transported to VOD, further to be deaerated, goes to be mingled with processing, by high vacuum, suitably
Bottom blowing stirring, can effectively reduce molten steel T.O, N content, then adds ferro-boron and carries out alloying, both reduce the oxidation damage of boron
It loses, also reduces the precipitation of BN in later period continuous casting process slab.The smelting process method improves boron element recovery rate, reduces
Boron alloy usage amount, reduces production cost, meanwhile, molten steel N content is reduced, increases effective B content in steel, to boracic
Quality, the stabilization of performance of steel have positive effect.
Compared with prior art, the beneficial effects of the present invention are:
(1) converter high temperature is tapped, and tapping process realizes deoxidation alloying and slag making, is eliminated LF station, is shortened smelting
Process flow reduces production cost；
(2) T.O in steel, N content is effectively reduced using VOD, significantly improves Cleanliness of Molten Steel, and reduce BN in slab
Precipitation, improve steel in effectively B content；
(3) boron element recovery rate is improved, boron content in steel is stabilized, reduces ferro-boron consumption.
Specific embodiment
Below by a detailed description of the technical solution in the embodiment of the present invention is provided, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
The boron-containing steel smelting process method of boron recovery rate is improved, process flow successively includes:
Alloy is added in tapping process and carries out deoxidation alloying for S1, kiln process, and tapping adds after terminating to ladle slag face
Entering slag adjusting agent and lime to control slag composition, oxygen gesture, tapping process ladle bottom whole process blowing argon gas keeps molten steel agitation, but
It does not seethe acutely；
Molten steel is transported to VOD after kiln process and is handled by S2, VOD process, and ladle allocation and transportation are followed by logical bottom in place
It blows, starts vacuumize process, high vacuum is kept to be de-gassed, go to be mingled with, ferro-boron is added in the VOD process later period, after ferro-boron is added
Continue to keep high vacuum circulation, molten steel is finally transferred out into carry out continuous casting process；
S3, continuous casting process take protective casting, prevent molten steel nitrogen pick-up, secondary oxidation.
Above-mentioned process obtains stable application in mass production, and ladle molten steel amount 120t, is contained using boron in production process
The ferro-boron that amount is 20.56%, the boron-containing steel that production boron content is 0.0010~0.0035%, uses smelting process of the present invention
Method carries out the alloying of smelting and boron.It is specific as follows:
Embodiment 1
1) converter high temperature is tapped, and tapping temperature reaches 1668 DEG C, and metallic aluminium, silicon are added into molten steel for tapping 30% or so
Iron, manganese alloy, carbon dust etc. carry out deoxidation alloying；Tapping terminates that slag adjusting agent 3.3kg/t, slag adjusting agent granularity is added to the ladle top of the slag
For 60mm, ingredient are as follows: Al 39%, Ca 8%, CaO 30%, Al2O316%, CaF26%, remaining is impurity, lime
2.6kg/t, the control of tapping process ladle bottom blowing argon flow is 150NL/min, and alloy, slag adjusting agent continue to keep after all adding
Bottom blowing stirring 4.5min；
2) ladle is allocated and transported to VOD station, and 1617 DEG C of VOD inlet temperature, T.Fe+MnO 1.76%, after ladle is in place
Bottom blowing is connected, and starts vacuumize process, argon bottom-blowing, hydrogen gas mixture flow are 15NL/min, argon gas and hydrogen capacity
Than being 8: 2, minimum vacuum degree is 42Pa, and each element content is finely tuned in place according to molten steel composition is entered the station, taken off by the degassing process stage
Then ferro-boron, ferro-boron additional amount 0.115kg/t is added in gas time 16.2min, ferro-boron, which is added, terminates to continue deep be vacuum-treated
Then 5.8min breaks empty, tapping.
3) molten steel T.O content 0.0012% when VOD taps, N content 0.0015%, content of B in molten 0.0021% are received
Yield reaches 88.5%.
Embodiment 2
1) converter high temperature is tapped, and tapping temperature reaches 1675 DEG C, and metallic aluminium, silicon are added into molten steel for tapping 30% or so
Iron, manganese alloy, carbon dust etc. carry out deoxidation alloying；Tapping terminates that slag adjusting agent 1.5kg/t, slag adjusting agent granularity is added to the ladle top of the slag
For 40mm, ingredient are as follows: Al 30%, Ca 10%, CaO 35%, Al2O315%, CaF25%, remaining is impurity, lime
2.0kg/t, the control of tapping process ladle bottom blowing argon flow is 80NL/min, and alloy, slag adjusting agent continue to keep after all adding
Bottom blowing stirring 4min；
2) ladle is allocated and transported to VOD station, and 1615 DEG C of VOD inlet temperature, T.Fe+MnO 1.55%, after ladle is in place
Bottom blowing is connected, and starts vacuumize process, argon bottom-blowing, hydrogen gas mixture flow are 5NL/min, argon gas and hydrogen capacity ratio
It is 7: 3, minimum vacuum degree is 49Pa, and each element content is finely tuned degassing in place according to molten steel composition is entered the station by the degassing process stage
Then ferro-boron, ferro-boron additional amount 0.119kg/t is added in time 15.5min, ferro-boron, which is added, terminates to continue deep be vacuum-treated
Then 6.3min breaks empty, tapping.
3) molten steel T.O content 0.0011% when VOD taps, N content 0.0016%, content of B in molten 0.0023% are received
Yield reaches 90.2%.
Embodiment 3
1) converter high temperature is tapped, and tapping temperature reaches 1655 DEG C, and metallic aluminium, silicon are added into molten steel for tapping 30% or so
Iron, manganese alloy, carbon dust etc. carry out deoxidation alloying；Tapping terminates that slag adjusting agent 5.5kg/t, slag adjusting agent granularity is added to the ladle top of the slag
For 70mm, ingredient are as follows: Al 40%, Ca 3%, CaO 25%, Al2O320%, CaF210%, remaining is impurity, lime
4.0kg/t, the control of tapping process ladle bottom blowing argon flow is 200NL/min, and alloy, slag adjusting agent continue to keep after all adding
Bottom blowing stirring 3.8min；
2) ladle is allocated and transported to VOD station, and 1625 DEG C of VOD inlet temperature, T.Fe+MnO 2.00%, after ladle is in place
Bottom blowing is connected, and starts vacuumize process, argon bottom-blowing, hydrogen gas mixture flow are 50NL/min, argon gas and hydrogen capacity
Than being 9: 1, minimum vacuum degree is 40Pa, and each element content is finely tuned in place according to molten steel composition is entered the station, taken off by the degassing process stage
Then ferro-boron, ferro-boron additional amount 0.124kg/t is added in gas time 15.3min, ferro-boron, which is added, terminates to continue deep be vacuum-treated
Then 5.3min breaks empty, tapping.
3) molten steel T.O content 0.0012% when VOD taps, N content 0.0017%, content of B in molten 0.0022% are received
Yield reaches 89.6%.
Comparative example
Original process route is converter smelting-LF refining-VOD vacuum-continuous casting, which integrally controls effect
Fruit is almost the same with the present invention, but process route is long, high production cost, and ferro-boron is added in LF refining process, the recovery rate of boron
It is relatively low.
1) Tapping Temperature of Bof is greater than 1620 DEG C, and tapping process is added metallic aluminium, ferrosilicon, manganese alloy, carbon dust etc. and is taken off
Oxygen alloy, and 1.5~4.0kg/t of lime is added, ladle bottom blowing flow set is 100~250NL/min.
2) ladle is allocated and transported to LF refining station, thermometric, sampling after LF refining, then according to inlet temperature, molten steel composition feelings
Condition controls temperature and adjustment chemical component, and a large amount of calcium carbides, metallic aluminium etc. is added and carries out deoxidation to clinker, to alloying component and furnace
After the control in place of slag oxygen gesture, ferro-boron, 0.12~0.21kg/t of ferro-boron additional amount are added.Ferro-boron Shi Kai great bottom blowing stirring is added
Then 5min or so reduces bottom blowing, tap after temperature, chemical component are adjusted in place.
3) ladle is allocated and transported to VOD station and is vacuum-treated, and vacuum degree control is in 50Pa hereinafter, bottom blown gas is mainly argon
Gas, bottom blowing 10~60NL/min of flow, degassing process time are greater than 18min, then break empty, tapping.
4) N content is mostly 0.0025% hereinafter, clinker T.Fe+MnO is less than 1.5% in molten steel when VOD taps, B in molten
Content is 0.0015%~0.0028%, and recovery rate is 56%~82%.
This embodiment is just an exemplary description of this patent and does not limit its protection scope, and those skilled in the art are also
Local change can be carried out to it, as long as it does not exceed the essence of this patent, all be considered as the equivalent replacement to this patent, all
Within the protection scope of this patent.
Claims (7)
1. a kind of boron-containing steel smelting process method for improving boron recovery rate, which is characterized in that process flow successively includes:
Alloy is added in tapping process and carries out deoxidation alloying for S1, kiln process, and tapping is added to ladle slag face after terminating and adjusts
Slag agent and lime control slag composition, oxygen gesture, and the tapping process ladle bottom whole process blowing argon gas keeps molten steel agitation, but
It does not seethe acutely；
Molten steel is transported to VOD after the kiln process and is handled by S2, VOD process, and ladle allocation and transportation are followed by logical bottom in place
It blows, starts vacuumize process, keep high vacuum to be de-gassed, go to be mingled with, ferro-boron is added in the VOD process later period, the boron
Iron continues to keep high vacuum circulation after being added, and molten steel is finally transferred out carry out continuous casting process；
S3, continuous casting process take protective casting, prevent molten steel nitrogen pick-up, secondary oxidation,
The amount that the slag adjusting agent is added is 1.5~5.5kg/t, and the amount that the lime is added is 2.0~4.0kg/t, the argon gas
Flow control is 80~200NL/min,
The granularity of the slag adjusting agent be 40~70mm, ingredient are as follows: Al 30~45%, Ca 3~10%, CaO 25~35%,
Al2O315~20%, CaF25~10%, impurity.
2. the boron-containing steel smelting process method according to claim 1 for improving boron recovery rate, which is characterized in that the tapping
Process temperature is greater than 1650 DEG C.
3. the boron-containing steel smelting process method according to claim 1 for improving boron recovery rate, which is characterized in that the alloy
And slag adjusting agent all add after continue keep blowing argon gas, the time be greater than 3min.
4. the boron-containing steel smelting process method according to claim 1 for improving boron recovery rate, which is characterized in that the molten steel
Temperature is greater than 1610 DEG C when transport is to VOD, content T.Fe+MnO≤2.0% in the clinker.
5. the boron-containing steel smelting process method according to claim 1 for improving boron recovery rate, which is characterized in that the VOD
Vacuum degree is maintained at 50Pa hereinafter, the bottom blowing flow is 5~50NL/min in the process, and the bottom blown gas is argon gas, hydrogen
Mixed gas, the two ratio are respectively 70%~90%: 10%~30%.
6. the boron-containing steel smelting process method according to claim 1 for improving boron recovery rate, which is characterized in that the degassing
Time is greater than 15min, and ferro-boron continues high vacuum 5min or more after being added.
7. the boron-containing steel smelting process method according to claim 1 for improving boron recovery rate, which is characterized in that the ferro-boron
Additional amount is 0.115-0.124kg/t.
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