CN107999718B - A method of improving micro-alloyed steel continuous casting process castability - Google Patents
A method of improving micro-alloyed steel continuous casting process castability Download PDFInfo
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- CN107999718B CN107999718B CN201711284204.2A CN201711284204A CN107999718B CN 107999718 B CN107999718 B CN 107999718B CN 201711284204 A CN201711284204 A CN 201711284204A CN 107999718 B CN107999718 B CN 107999718B
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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Abstract
The invention discloses a kind of methods for improving micro-alloyed steel continuous casting process castability, are related to micro-alloyed steel continuous casting production field.The method of improvement micro-alloyed steel continuous casting process castability of the invention applies pulse current to the microalloy molten steel in tundish when micro alloyed steel slab is poured using continuous casting process；The parameter of pulse current are as follows: 10~36V of pulse voltage, 100~2000A of pulse current, 1000~30000Hz of pulse frequency；It include Ti element in micro alloyed steel；When applying pulse current, the degree of superheat of microalloy molten steel is controlled at 20~40 DEG C.It is an object of the invention to submersed nozzles during overcoming the shortcomings of existing titanium micro-alloyed steel continuous casting easily to block, and provide a kind of method for improving micro-alloyed steel continuous casting process castability, guarantee that production is gone on smoothly.
Description
Technical field
The present invention relates to micro-alloyed steel continuous casting production fields, more specifically to a kind of improvement micro-alloyed steel continuous casting mistake
The method of journey castability.
Background technique
During the existing casting using continuous casting process, since the high-melting-point field trash in molten steel easily adheres to crystallizer
On submersed nozzle inner wall, blocking is brought it about, so causing the casting sequence of tundish time lower, production cost increases
Add, organization of production is by extreme influence.Especially casting section lesser continuous casting billet when, due to crystallizer submersed nozzle internal diameter
Smaller, clogging is more serious.
The castability of molten steel when in order to improve continuous casting, has been presented for some solutions, wherein needle in the prior art
To the castability for how improving mild steel, following technical solution, such as patent publication No.: CN are disclosed in the prior art
102268513 A, publication date: on December 07th, 2011, invention and created name are as follows: a kind of to improve middle low carbon steel pourability of molten steel
Method, this application provide a kind of method for improving middle low carbon steel pourability of molten steel comprising: by the sulfur content control in molten iron
It is made as no more than 0.015%；Just refining is carried out to form molten steel, then by molten steel tapping into ladle to molten iron；By weight hundred
During dividing ratio meter tapping 20%~30%, aluminium is substantially free of according to oxygen content addition when just refining terminal in molten steel is suitable
Or the deoxidier without aluminium；During tapping 31%~50% by weight percentage, added according to the oxygen content in molten steel
The active lime and additional amount that enter 3.0~5.0Kg/ tons of steel are 20% fluorite of active lime；First time ar blowing refining；Ladle
Furnace refines and carries out second of ar blowing refining；It is cast using continuous casting process.This application does not need to carry out Calcium treatment, just makes
Pourability of molten steel be effectively improved, nozzle clogging phenomenon is alleviated, in low-aluminum-content in low-carbon aluminium continuous casting process in
Between continuous cast crystallizer number be not less than 8 furnaces, achieved the purpose that economical production.
For the castability for how improving mild steel, following technical solution, such as patent public affairs are also disclosed in the prior art
The number of opening: 103451349 A of CN, publication date: on December 18th, 2013, invention and created name are as follows: one kind prevents Ultra-low carbon aluminium deoxidation
The control method of molten steel casting process nozzle blocking, this application use desulfurizing iron processing-converter smelting-converter tapping-RH
Vacuum processing-double fluid sheet billet continuous casting casting processing route smelting suprelow carbon steel, improves the castability of Ultra-low carbon aluminium deoxidation molten steel,
Rationally endpoint molten steel oxygen content, end point carbon content and temperature are bessemerized in control, provide advantage for RH vacuum decarburization；Continuous casting
Protective casting is protected using long nozzle, submersed nozzle argon blowing seal, prevents secondary oxidation of steel；Using alkaline covering agent, prevent
Only secondary oxidation of steel preferably adsorbs the field trash in molten steel；The castability for improving Ultra-low carbon aluminium deoxidation molten steel, realizes
It is whole pour time sequence casting during submersed nozzle do not block, do not have to replacement submersed nozzle, to avoid because replacing immersion
The mouth of a river and influence slab quality.
The carbonitride of microalloy element is conducive to improve steel strength and toughness, and it is present to be formed by micro-alloying technology
Just it is being applied to extensive field, especially high-quality steel, such as Properties of Heavy Rail Steel, tool steel.Substantially with micro alloyed steel yield
It increases, and the raising to steel material performance requirement, new quality problems is constantly exposed in actual production, in low-alloy
Trace Ti is added in high-strength steel, casting blank solidification tissue can be refined, improves the intensity of steel, improves cold formability energy and the welding of steel
Performance.Ti has apparent cost advantage relative to Nb and V, relatively more for the research of titanium micro-alloyed steel in the prior art.
But found during existing titanium micro-alloyed steel continuous casting, the mouth of a river tends to block when casting, the castability of molten steel compared with
Difference.
It is urgent need to resolve in the prior art in conclusion how to improve the castability of existing titanium micro-alloyed steel continuous casting process
Technical problem.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome submersed nozzle during existing titanium micro-alloyed steel continuous casting easily to block
Deficiency provides a kind of method for improving micro-alloyed steel continuous casting process castability, guarantees that production is gone on smoothly.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
The method of improvement micro-alloyed steel continuous casting process castability of the invention, when micro alloyed steel slab is poured using continuous casting process
When note, pulse current is applied to the microalloy molten steel in tundish, while micro- into tundish by ultrasonic generator
Alloy molten steel emits ultrasonic wave, and wherein ultrasonic power density is 18-35W/cm2, frequency 20-30KHz.
As further improvement of the present invention, the parameter of the pulse current are as follows: 10~36V of pulse voltage, pulse electricity
Flow 100~2000A, 1000~30000Hz of pulse frequency.
It include Ti element in the micro alloyed steel as further improvement of the present invention.
As further improvement of the present invention, when applying pulse current, the degree of superheat control of microalloy molten steel 20~
40℃。
As further improvement of the present invention, C < 0.25%wt or 0.25%≤C≤0.60% in the micro alloyed steel
Wt or C > 0.60%wt.
As further improvement of the present invention, the content of Ti element is 0.10%wt-0.80%wt in micro alloyed steel.
As further improvement of the present invention, applying the pulsed electrode that pulse current uses is aluminium carbonaceous pulsed electrode.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) in the present invention, after applying pulse current, the change procedure inside titanium micro-alloyed molten steel is as follows: titanium micro-alloyed steel
The nucleation rate of precipitate TiN in water is significantly improved, to inhibit single TiN particle that growing up for size is precipitated, largely
The TiN precipitate of small size flows away from submersed nozzle, avoids original large scale TiN precipitate particle and easily blocks immersion
The phenomenon that mouth of a river, improves the castability of titanium micro-alloyed steel continuous casting process.
(2) inventor the study found that in micro alloyed steel add Ti element content be 0.10%wt-0.80%wt, match
Close the parameter of pulse current are as follows: 10~36V of pulse voltage, 100~2000A of pulse current, 1000~30000Hz of pulse frequency,
The nucleation rate that TiN can farthest be improved, avoids nozzle blocking, so as to improve pouring for micro-alloyed steel continuous casting process
Property；Wherein it should be noted that when applying pulse current, the degree of superheat of microalloy molten steel needs to control at 20~40 DEG C, thus
Pulse current can effectively be played to the regulating and controlling effect of TiN precipitation process.
(3) in the present invention, apply the operation of pulse current, do not change the technological parameter of existing production process, do not need pair
Production process is especially controlled, and produced on-site is not influenced, easy to operate, low in cost, can effectively improve micro alloyed steel company
The castability of casting process；Wherein, voltage < 36V of the pulse current used, belongs to safe voltage, does not influence personal safety, to life
Equipment is produced without influence.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram of the device of the improvement micro-alloyed steel continuous casting process castability of embodiment 1；
Fig. 2 is the structural schematic diagram of electrode clamping mechanism in embodiment 1-7；
Fig. 3 is the structural schematic diagram of clamping piece in Fig. 2；
Fig. 4 be Fig. 2 in energization part along A to structural schematic diagram；
Fig. 5 is the structural schematic diagram of electrode clamping mechanism in embodiment 7；
Fig. 6 is the structural schematic diagram of electrode clamping mechanism in embodiment 8；
Fig. 7 is the transmission electron microscope picture of slab sampling in embodiment 1.
Label declaration in schematic diagram: 1, pulsed electrode；2, clamping piece；201, wheel flange；202, clamping piece；3, it is powered
Part；301, energization bar；302, connection sheet；4, conductive sheet；5, collets；6, extension bar；7, the first bolt；8, the second bolt；9,
The pulse power；10, stopper；11, ladle；12, long nozzle；13, tundish；14, submersed nozzle；15, barricade；16, dam.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Therefore, below to the embodiment of the present invention provided in the accompanying drawings
Detailed description be not intended to limit the range of claimed invention, but be merely representative of selected embodiment of the invention.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
To further appreciate that the contents of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
In conjunction with Fig. 1-4, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, including casting mechanism and electricity
Pole clamping device.
Casting mechanism includes ladle 11 and tundish 13, and ladle 11 is placed in 13 top of tundish, passes through length inside ladle 11
It is connected to inside the mouth of a river 12 and tundish 13；The bottom of tundish 13 is communicated with submersed nozzle 14, the submersed nozzle 14 and plug
Stick 10 is used cooperatively, and mutually matched barricade 15 and gear are provided between 13 inside submersed nozzle 14 of tundish and long nozzle 12
Dam 16.
Electrode clamping mechanism includes: columned pulsed electrode 1, when micro alloyed steel slab is poured using continuous casting process,
Pulsed electrode 1 is placed in the microalloy molten steel in tundish 13 and applies pulse current to microalloy molten steel；Clamping piece 2, clamping
Part 2 is for clamping pulsed electrode 1；One end of energization part 3, energization part 3 is connect with clamping piece 2, and energization part 3 and the pulse power 9 connect
It connects；One end of extension bar 6, extension bar 6 is connect by collets 5 with the other end of energization part 3.Wherein, the parameter of pulse current
Are as follows: 10~36V of pulse voltage, 100~2000A of pulse current, 1000~30000Hz of pulse frequency；It include Ti in micro alloyed steel
Element, the content of Ti element is 0.10%wt-0.80%wt in micro alloyed steel；When applying pulse current, the mistake of microalloy molten steel
Temperature is controlled at 20~40 DEG C；C<0.25%wt or 0.25%≤C≤0.60%wt or C>0.60%wt in micro alloyed steel.
In specific the present embodiment, the material of steel alloy is AISI321 titanium micro-alloyed steel, and main chemical compositions are (quality
Percentage): 0.031%C, 0.74%Si, 0.99%Mn, 0.027%P, 0.003%S, 17.33%Cr, 9.34%Ni,
0.12%Ti, 0.019%Al.After the ladle 11 for filling with microalloy molten steel is transported to ladle turret, tundish car carries baking
Tundish 13 after roasting reaches casting position, then carries out open casting operation, microalloy molten steel is from 11 bottom of ladle along long nozzle 12
Into tundish 13, microalloy molten steel overheat control at this time is 25 DEG C.When molten steel rises to operating fluid level in tundish 13, open
Stopper 10, microalloy molten steel enters crystallizer along submersed nozzle 14 and secondary cooling zone solidifies out into continuous casting billet.To tundish 13
The positive and negative anodes of pulsed electrode 1 are inserted respectively into tundish 13 in molten steel by interior liquid level stabilizing after operating fluid level, open pulse
Power supply 9, adjusting parameter are as follows: pulse voltage 13.6V, pulse current: 800A, pulse frequency 25000Hz, it is continuous to be poured 10 furnace steel
Afterwards, do not occur the phenomenon that nozzle blocking.
One piece of sample is cut from the slab that the above continuous casting goes out, wire cutting is the sample of 15mm × 15mm, by sample surfaces
It polishes and polishes, it is just dimmed to specimen surface with 4% nital etch sample, using vacuum coating equipment to sample
There is steel in 300 DEG C or so the tempering occurred blues, then illustrate that thickness conforms in spraying plating carbon film, the specimen surface after spraying carbon
It asks, then marks the lattice that diagonal line spacing is 2mm on carbon film face with blade, sample carbon film face is then put into 4% nitre
Carbon film is pulled out to clean and be dried by etch in sour alcoholic solution after carbon film falls off from specimen surface using copper mesh, is put into transmission electricity
In mirror, it can TiN pattern therein is observed, wherein discovery TiN size concentrates between 10~80nm, as shown in Figure 7.
In the present embodiment, apply pulse current after, the change procedure inside microalloy molten steel is as follows: to microalloy molten steel into
After row pulsed current annealing, the nucleation rate of the precipitate TiN in microalloy molten steel is significantly improved, to inhibit single
Growing up for size is precipitated in TiN particle, and the TiN precipitate of a large amount of small sizes (10~100nm) flows away from submersed nozzle 14, keeps away
The phenomenon that original large scale TiN precipitate (1~100um) particle easily blocks submersed nozzle 14 is exempted from, has improved titanium micro-alloyed
The castability of steel continuous casting process.
By analyzing nozzle blocking mechanism, it can be deduced that the main reason for causing nozzle blocking includes molten steel matter
Amount, liquid steel temperature, mouth of a river material and structure, the mouth of a river are conducted heat and all many factors such as secondary oxidation.Nitride of the titanium in steel
Mainly exist in the form of TiN, titanium is initially formed TiN in steel, and TiN granular size is related with its precipitation process.Firstly, coarse
TiN is the precipitated phase during solidification of molten steel, when being distributed more coarse TiN in molten steel, not only wastes Ti element, and have phase
Reaction not can effectively stop crystal grain and grow up, and not play invigoration effect, in the present embodiment, find by lot of experiments,
During titanium micro-alloyed steel continuous casting, coarse TiN significantly affects titanium micro-alloyed as a kind of easy substance for forming mouth of a river storage stream
The castability of steel continuous casting process, in order to avoid coarse TiN is formed, in the prior art generally by reduce molten steel in titanium nitrogen product come
It realizes, this, which stores stream to the mouth of a river, certain alleviation, but the precipitation total amount of TiN will necessarily be reduced by reducing titanium nitrogen product, limit rolling
Steel performance afterwards.In the prior art, history rosy clouds study the (reference: Shi Cai of 430 ferritic stainless steel TiN forming core thinning solidification structures
Beijing research [D] of rosy clouds .430 ferritic stainless steel TiN forming core thinning solidification structure: University of Science & Technology, Beijing, 2007.), and
State of Zhao's light studies the (reference: State of Zhao's light, the solidification of the clean steel titanium nitride such as Zhu Xiaoxia, Zhao Pei of clean steel titanium nitride solidification refinement technology
Basis [J] the University of Science & Technology, Beijing journal of refinement technology, 2002, Vol, 24 (3): 274.), all showing to utilize tiny TiN shape
Core is a kind of effective means of thinning solidification structure.But tiny TiN is formed in molten steel, needs stringent technology controlling and process,
And coarse TiN is easily formed, to significantly affect continuous casting process molten steel castability.
Therefore, for the continuous casting process of titanium micro-alloyed steel, on the one hand wish to form tiny TiN refinement solidification group
It knits, is on the other hand not intended to be formed coarse TiN and influences molten steel and be normally poured.But it is based on existing technology, above-mentioned two
A aspect can not often get both, and fail always to overcome the above problem in the prior art, and having its source in effectively accurately to control
The pick-up behavior of TiN in titanium micro-alloyed steel.
Inventor is not intended to discovery by many experiments, can preferably control TiN in titanium micro-alloyed steel using pulse current
Pick-up behavior, specifically: inventor reduces the forming core of TiN the study found that pulsed current annealing can promote the precipitation of TiN
Potential barrier We, thus improve nucleation rate Ie, can be improved the amount of precipitation of tiny TiN particle and reduce the amount of precipitation of coarse TiN,
Its key is that control nucleation rate improves, because the total amount of Ti element is limited, TiN nucleation rate is higher, the TiN particle ruler of precipitation
It is very little just smaller.
Meanwhile inventor the study found that in micro alloyed steel add Ti element content be 0.10%wt-0.80%wt, match
Close the parameter of pulse current are as follows: 10~36V of pulse voltage, 100~2000A of pulse current, 1000~30000Hz of pulse frequency,
The nucleation rate that TiN can farthest be improved, avoids nozzle blocking, so as to improve pouring for titanium micro-alloyed steel continuous casting process
Property.Wherein it should be noted that when applying pulse current, the degree of superheat of microalloy molten steel needs to control at 20~40 DEG C, thus
Pulse current can effectively be played to the regulating and controlling effect of TiN precipitation process.
Further, when micro alloyed steel slab is poured using continuous casting process, pulsed electrode 1 is placed in micro- in tundish 13
Apply pulse current in alloy molten steel and to microalloy molten steel, while passing through micro- conjunction of the ultrasonic generator into tundish 13
Golden molten steel emits ultrasonic wave, and wherein ultrasonic power density is 18-35W/cm2, frequency 20-30KHz, in application pulse current
When improving TiN nucleation rate, the TiN of a large amount of small sizes is precipitated, while cooperating the use of the above certain power and frequency ultrasonic wave, can
Sustained vibration stirring is formed to the microalloy molten steel in tundish 13, so that the TiN of a large amount of small sizes is uniformly distributed in steel
In liquid, the TiN of small size is effectively avoided to form large-sized TiN because of localized clusters, to further improve titanium micro-alloyed steel
The castability of continuous casting process.Wherein, to the ultrasonic wave of microalloy molten steel transmitting certain power and frequency, to a certain extent may be used
To improve the nucleation rate of TiN.
In conjunction with Fig. 2-4, in the present embodiment, collets 5 are set between extension bar 6 and energization part 3, so that 6 He of extension bar
It is non-conductive between energization part 3, facilitate operator to hold extension bar 6 and operate, guarantees the safety of produced on-site；Extension bar 6
It is connect with energization part 3, extension bar 6 is placed on crosshead, operator facilitates operation, improve work far from hot environment
Make efficiency.
In the present embodiment, applying the pulsed electrode 1 that pulse current uses is aluminium carbonaceous pulsed electrode, has good conduction
And high temperature resistance.
In the present embodiment, apply the operation of pulse current, does not change the technological parameter of existing production process, do not need to life
Production process is especially controlled, and produced on-site is not influenced, easy to operate, low in cost, can effectively improve micro-alloyed steel continuous casting
The castability of process；Wherein, voltage < 36V of the pulse current used, belongs to safe voltage, does not influence personal safety, to production
Equipment is without influence.
Embodiment 2
In conjunction with Fig. 2-4, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and embodiment 1
Essentially identical, further: clamping piece 2 includes two semicircular rings with flanging, the arc sections of two semicircular rings with flanging
Divide and surround wheel flange 201, which is wrapped in the lateral surface of pulsed electrode 1, the corresponding folding of two semicircular rings with flanging
Rim portion is connected by the first bolt 7, forms clamping piece 202.
In the present embodiment, clamping piece 2 includes two semicircular rings with flanging, the circular arc portion of two semicircular rings with flanging
Wheel flange 201 is surrounded, which is wrapped in the lateral surface of pulsed electrode 1, the correspondence flanging of two semicircular rings with flanging
Part is connected by the first bolt 7, forms clamping piece 202, and wheel flange 201 is fitted tightly over the lateral surface of pulsed electrode 1, can will
Pulsed electrode 1 firmly clamps, wherein can clamp the pulsed electrode 1 of specific dimensions by wheel flange 201, guarantee that production is suitable
Benefit carries out；And wherein require: wheel flange 201 has some strength, high temperature resistant and does not react with pulsed electrode 1；3 energy of energization part
It is conductive and resistance is small, has some strength and high temperature resistant；Collets 5 have some strength, high temperature resistant and certain length and thickness
Guarantee that energization part 3 is not contacted with extension bar 6；Extension bar 6 is to have some strength, length and metallic rod relatively resistant to high temperature.
Embodiment 3
In conjunction with Fig. 2-4, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and embodiment 2
Essentially identical, further: energization part 3 includes energization bar 301 and the connection sheet 302 for being connected to 301 both ends of energization bar；It is logical
The connection sheet 302 of 301 one end of electric pole is connected on a clamping piece 202 of clamping piece 2 by the second bolt 8.
In the present embodiment, energization part 3 includes energization bar 301 and the connection sheet 302 for being connected to 301 both ends of energization bar, is led to
The connection sheet 302 of 301 one end of electric pole is connected on a clamping piece 202 of clamping piece 2 by the second bolt 8, so that energization bar
It is easy for installation between 301 and clamping piece 2, it is used convenient for scene.
Embodiment 4
In conjunction with Fig. 2-4, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and embodiment 3
It is essentially identical, it is further: conductive sheet 4 to be connected on energization bar 301, which is equipped with through-hole, conductive sheet 4 and arteries and veins
Rush the connection of power supply 9.
In the present embodiment, conductive sheet 4 is connected on energization bar 301, which is equipped with through-hole, can be by leading to above
Hole easily connects the pulse power 9, improves installation and operating efficiency.
Embodiment 5
In conjunction with Fig. 2-4, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and embodiment 4
Essentially identical, further: electrode clamping mechanism further includes insulated bolt, and it is another that insulated bolt sequentially passes through energization bar 301
One end of the connection sheet 302 at end, collets 5 and extension bar 6, and three is connected and fixed.
In the present embodiment, insulated bolt sequentially passes through connection sheet 302, collets 5 and the lengthening of 301 other end of energization bar
One end of bar 6, and three is connected and fixed, the installation between energization bar 301 and extension bar 6 is both facilitated, while absolutely
Edge bolt is non-conductive, guarantees the safety of produced on-site.
Embodiment 6
In conjunction with Fig. 2-4, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and embodiment 5
Essentially identical, further: the both ends of pulsed electrode 1 are respectively equipped with the blocking round block that diameter is greater than 1 diameter of pulsed electrode.
In the present embodiment, the both ends of pulsed electrode 1 are respectively equipped with the blocking round block that diameter is greater than 1 diameter of pulsed electrode, protect
Shield pulsed electrode 1 is not skidded off out of wheel flange 201, improves the using effect of clamping piece 2.
Electrode clamping mechanism in the present embodiment, suitable for the process exerted one's influence using pulse current to molten steel solidification,
There is certain structural strength, to be hardly damaged, it is ensured that the safety of pulsed electrode 1, the pulse power 9 enables to pulse current
Insulation between ground and operator guarantees that electric current does not dissipate, and realizes distant insulating operation, guarantees in high-temperature molten steel
Neighbouring long period of operation is indeformable without melting, and can be used for multiple times for a long time, guarantee the safety and continuity of produced on-site.
Electrode clamping mechanism in the present embodiment, does not change steel grades, does not need addition alloying element, does not change centre
Package production apparatus and technique, it is pollution-free to slab and equipment, it is non-hazardous to personnel, it is a kind of solidifying to molten steel applied to pulse current
The new equipment of process Gu process is exerted one's influence.
Embodiment 7
In conjunction with Fig. 5, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and 6 base of embodiment
This is identical, further: the quantity of insulated bolt is two.
In the present embodiment, be arranged two insulated bolts sequentially pass through respectively 301 other end of energization bar connection sheet 302, absolutely
One end of edge block 5 and extension bar 6, and three is connected and fixed, it is ensured that energization bar 301 and extension bar 6 are close
The two sides for being fixed on collets 5, prevent energization bar 301 or extension bar 6 from rotating along collets 5, that improves device can
By property.
Embodiment 8
In conjunction with Fig. 6, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and 7 base of embodiment
This is identical, further: the quantity of the second bolt 8 is equal to two.
In the present embodiment, two the second bolts 8 are set, the connection sheet 302 of 301 one end of energization bar passes through two the second bolts
8 are connected on a clamping piece 202 of clamping piece 2, it is ensured that energization bar 301 and clamping piece 2 are tightly secured together, and are prevented
Energization bar 301 or clamping piece 2 rotate, and improve the reliability of device.
Embodiment 10
In conjunction with Fig. 6, the device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure and 7 base of embodiment
This is identical, further: the connection sheet 302 of 301 one end of energization bar passes through second bolt 8 and corresponding first spiral shell
Bolt 7 is connected on a clamping piece 202 of clamping piece 2, it is ensured that energization bar 301 and clamping piece 2 are tightly secured together, and are prevented
Only energization bar 301 or clamping piece 2 rotate, and improve the reliability of device.
Embodiment 11
The device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure is same as Example 1, different
Place is: alloy composition is different, and main chemical compositions are (mass percent): 0.046%C, 0.67%Si, 1.01%
In addition Mn, 0.023%P, 0.002%S, 17.16%Cr, 9.20%Ni, 0.75%Ti, 0.017%Al apply pulse current
When, the control of microalloy molten steel overheat is 35 DEG C, after 10 furnace steel of continuous casting, does not occur the phenomenon that nozzle blocking.
Embodiment 12
The device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure is same as Example 1, different
Place is, when applying pulse current, the parameter of pulse current are as follows: pulse voltage 35.5V, pulse current: 1800A, pulse frequency
Rate 2000Hz does not occur the phenomenon that nozzle blocking after being continuously poured 10 furnace steel.
Embodiment 13
The device of the improvement micro-alloyed steel continuous casting process castability of the present embodiment, structure is same as Example 1, different
Place is, when applying pulse current, the parameter of pulse current are as follows: pulse voltage 16.3V, pulse current: 1200A, pulse frequency
Rate 20000Hz does not occur the phenomenon that nozzle blocking after being continuously poured 10 furnace steel.
It should be noted that micro alloyed steel can be mild steel, the middle carbon of 0.25%≤C≤0.60%wt of C < 0.25%wt
The high-carbon steel of steel and C > 0.60%wt includes Ti element in these mild steel, medium carbon steel and high-carbon steel, herein not one by one
It enumerates.
Schematically the present invention and embodiments thereof are described above, description is not limiting, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited to this.So if the common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (2)
1. a kind of method for improving micro-alloyed steel continuous casting process castability, it is characterised in that using improvement micro-alloyed steel continuous casting process
The device of castability, the device for improving micro-alloyed steel continuous casting process castability includes casting mechanism and electrode clamping mechanism；
The casting mechanism includes ladle (11) and tundish (13), and the ladle (11) is placed in above tundish (13), ladle (11)
Inside inside long nozzle (12) and tundish (13) by being connected to；
The electrode clamping mechanism includes:
Columned pulsed electrode (1), when micro alloyed steel slab is poured using continuous casting process, the pulsed electrode (1) is placed in
Apply pulse current in microalloy molten steel in tundish (13) and to microalloy molten steel；Simultaneously by ultrasonic generator to
Microalloy molten steel in tundish (13) emits ultrasonic wave, and wherein ultrasonic power density is 18-35W/cm2, frequency 20-
30KHz；
Clamping piece (2), the clamping piece (2) is for clamping the pulsed electrode (1)；Energization part (3), the energization part (3)
One end is connect with the clamping piece (2), and the energization part (3) connect with the pulse power (9)；Extension bar (6), the extension bar
(6) one end is connect by collets (5) with the other end of the energization part (3)；
The parameter of the pulse current are as follows: 10~36V of pulse voltage, 100~2000A of pulse current, pulse frequency 1000~
30000Hz；
It include Ti element in the micro alloyed steel, the content of Ti element is 0.10%wt-0.80%wt；
When applying pulse current, the degree of superheat of microalloy molten steel is controlled at 20~40 DEG C；
C<0.25%wt or 0.25%≤C≤0.60%wt or C>0.60%wt in the micro alloyed steel.
2. the method according to claim 1 for improving micro-alloyed steel continuous casting process castability, which is characterized in that apply pulse
The pulsed electrode (1) that electric current uses is aluminium carbonaceous pulsed electrode.
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