CN110293219A - A kind of method of large scale calcium-aluminate field trash in reduction steel - Google Patents
A kind of method of large scale calcium-aluminate field trash in reduction steel Download PDFInfo
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- CN110293219A CN110293219A CN201910574074.9A CN201910574074A CN110293219A CN 110293219 A CN110293219 A CN 110293219A CN 201910574074 A CN201910574074 A CN 201910574074A CN 110293219 A CN110293219 A CN 110293219A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
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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
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Abstract
The invention discloses a kind of methods of large scale calcium-aluminate field trash in reduction steel, and this method is by controlling Al2O3The decarburized depth of the resistance to material of-C mass immersion type sprue achievees the purpose that reduce large scale calcium-aluminate field trash；The resistance to material of the continuous casting being related to is tundish immersed nozzle, and the main constituent element of the resistance to material of submersed nozzle is aluminium oxide and carbon；In STEELMAKING PRODUCTION, by controlling Al2O3The decarburized depth of the resistance to material of-C mass immersion type sprue, to reduce large scale calcium-aluminate field trash.The steel grade produced using the method for the present invention, can greatly reduce the quantity of large scale calcium-aluminate, improve the quality of steel product.
Description
Technical field
The present invention relates to a kind of methods of large scale calcium-aluminate field trash in reduction steel.
Background technique
In steel all there are many steel products and influence in large scale calcium-aluminate field trash, therefore such as bearing steel, pipe line steel
Deng all proposing technical requirements to calcium-aluminate field trash in steel.In order to reduce or even prevent large scale calcium-aluminate, many smeltings
Metal working author has been carried out related work.
Through retrieving, control molten steel is concentrated mainly on about the patent for reducing large scale calcium-aluminate field trash in steel both at home and abroad
Deoxidation mode, as " a kind of bearing steel molten steel deoxidation control method of no Ds type impurity ", " it is a kind of be conducive to control field trash
Bearing steel smelting process " it selects conventional aluminium deoxidation technique being changed to silicon deoxidization technique, calcium-aluminate field trash is reduced with this
Size and number；
Through retrieving, optimization refining is concentrated mainly on about the document for reducing large scale calcium-aluminate field trash in steel both at home and abroad
Process Calcium treatment amount, control basicity of slag, control continuous casting handover base etc.；As " in carbon aluminium-killed steel LF refining process steel
The research of non-metallic inclusion " in elaborate that Calcium treatment will lead to calcium-aluminate inclusion size and become larger, therefore advocate refining knot
Slight Calcium treatment or not Calcium treatment, " influence of the basicity of slag to Ds field trash in mild steel " Wen Zhongti are carried out to molten steel after beam
Control calcium-aluminate size is achieved the purpose that, " after mesh portion cast piece To お け Ru Jie in object to by controlling basicity of slag
Source " large scale calcium-aluminate is mentioned from the mixed punching of steel slag for changing packet procedures in text, base should be joined to continuous casting and controlled.?
Influence of the resistance to material material to steel inclusion, but main collection are had studied in " influence and optimization of the resistance to material of ladle to steel inclusion "
In on oxygen content in steel, sulphide inculsion, Silicate Inclusions, alumina inclusion, there is no to large scale calcium aluminic acid in molten steel
Salt field trash is illustrated, on the other hand the large-sized inclusions that refining process generates can be in smelting process and subsequent soft
The floating removal of journey rapidly is blown over, a large amount of large-sized inclusions will not be generated in this process and left in subsequent product,
Present document relates to large scale calcium-aluminate field trash its generating unit in middle water containing opening, just enter in crystallizer coagulated quickly
Gu green shell captures, it is difficult removal of floating, it is therefore desirable to priority control.
A kind of method for reducing large scale calcium-aluminate field trash in steel of the present invention, by controlling Al2O3- C mass immersion type water
The decarburized depth of the resistance to material of mouth, makes the inner wall of resistance to material decarburized depth≤1.5mm, reaches and reduces large scale calcium-aluminate field trash in steel
Method.
Summary of the invention
The purpose of the present invention is developing a kind of method for reducing large scale calcium-aluminate field trash in steel, in other works
Under conditions of skill condition is constant, this method can reduce large scale calcium-aluminate the amount of inclusions in steel well, promote steel
The cleanliness of material.
The present invention provides a kind of methods of large scale calcium-aluminate field trash in reduction steel, pass through control Al2O3- C matter
The decarburized depth of the resistance to material of submersed nozzle makes the inner wall of resistance to material decarburized depth≤1.5mm, realizes control bulky grain calcium-aluminate with this
The quantity of field trash.
The control method includes following main points:
The resistance to material of continuous casting of the present invention is tundish immersed nozzle, material Al2O3- C matter, wherein Al2O3≥
50%, C >=1%；By controlling Al2O3The decarburized depth of the resistance to material of-C mass immersion type sprue, make the inner wall of resistance to material decarburized depth≤
1.5mm, to realize the quantity for reducing large scale calcium-aluminate field trash.
Further, the present invention is that the decarburized depth of the resistance to material of submersed nozzle is controlled by baking regime,
Further, baking process are as follows:
Select Al2O3- C matter tundish immersed nozzle, it is desirable that the total 3~5h of baking time of submersed nozzle toasts 1 first
~1.5h, it is desirable that in this 1~1.5h, middle packet submersed nozzle temperature is maintained at 100 DEG C；And then it is heated up with 30 DEG C/min fast
Rate is brought rapidly up to 600 DEG C~800 DEG C, is warming up to 600 DEG C~800 DEG C 0.5~3h of heat preservation；900 DEG C are warming up to after heat preservation again,
900 DEG C of heat preservation 1h.
The present invention makes Al by baking time, the baking temperature of control tundish immersed nozzle2O3- C mass immersion type water
Decarburized depth≤1.5mm after using of the resistance to material of mouth, to realize the purpose for reducing large scale calcium-aluminate field trash in steel.
Since the generation of large scale calcium-aluminate in steel is various, in steel-making refining procedure or more forwardly of life
It produces in process, if producing large scale calcium-aluminate field trash in steel, is also may rely on soft blow process and completes its removal of floating；But
In continuous casting process, since molten steel enters in crystallizer quickly through after tundish immersed nozzle, if in tundish immersion
Large scale calcium-aluminate field trash is produced at the mouth of a river, then the large scale calcium-aluminate field trash at all without float removal when
Between, it is just captured, is retained in steel product by continuous casting steel billet quickly, product quality will finally be had an impact.Based on this mechanism,
It proposes to reduce by the baking regime (the most fundamental control method is the resistance to material decarburization of control) for controlling the resistance to material of soaking water gap to reach
The purpose of large scale calcium-aluminate in steel.
It is specifically described below in the present invention by controlling resistance to material decarburization and reduces large scale calcium-aluminate field trash in steel
The reasons why method.The continuous casting being illustrated in fig. 1 shown below is intended to, by the continuous casting schematic diagram of Fig. 1 it is found that molten steel is complete from tundish
Portion, which will flow through tundish immersed nozzle, can just reach crystallizer, and final crystallized device etc. is cooled into continuous casting billet.
The small size calcium-aluminate field trash in calcium and steel when passing through tundish immersed nozzle due to molten steel, in steel
It can react to each other with resistance to material, reaction is carried out by following (1), (2)；It can aggreation production at the inner wall of resistance to material after this reaction
Raw calcium-aluminate field trash is out resistance to material and enters molten steel, become when the calcium-aluminate field trash of aggregation is to certain size
Large-sized calcium-aluminate field trash.
Ca(calcium in molten steel)+Al2O3 (resistance to materials)→CaO-Al2O3 (calcium-aluminate field trashes)…………………………(1)
CaO-Al2O3 (calcium-aluminate field trashes in molten steel)+Al2O3 (resistance to materials)→CaO-Al2O3 (calcium-aluminate field trashes)…………(2)
Therefore reducing calcium-aluminate field trash in molten steel and molten steel can reduce due to resistance to material and produce with the reaction of resistance to material
Raw calcium-aluminate field trash；But all molten steel must just can enter crystallizer, therefore this hair by tundish immersed nozzle
It is bright that large scale calcium-aluminate in steel is reduced with the contact area of resistance to material by calcium-aluminate field trash in control molten steel and molten steel
Generation.
The schematic diagram of resistance to material decarburization and non-decarburization as shown in Figure 2, it is known that molten steel is the same as resistance to material when decarburization does not occur for resistance to material
The chance and area of middle oxide contact are all smaller, because the carbon in resistance to material plays barrier action, while in specific surface area,
Hydraulically smooth surface is also much smaller；If decarburization once has occurred in resistance to material, wall surface becomes very coarse, and molten steel will largely enter
It in resistance to material decarburization channel, and reacts with the aluminium oxide in resistance to material, the specific surface area reacted after decarburization substantially increases.By above
Known to analysis after decarburization occurs for continuous casting tundish submerged nozzle, haptoreaction area of the molten steel with resistance to material will be greatly improved,
The generation for promoting calcium-aluminate, finally will lead to large scale calcium-aluminate field trash in steel and increases.
Detailed description of the invention
Fig. 1 is the schematic diagram of continuous casting；
Fig. 2 is the contrast schematic diagram that molten steel is reacted with the resistance to material of non-decarburization, the resistance to material of decarburization；
Fig. 3 is that the decarburized layer electron microscope after molten steel is poured in the drawing of 1 tundish immersed nozzle of embodiment；
Fig. 4 is that the decarburized layer electron microscope after molten steel is poured in the drawing of 1 tundish immersed nozzle of comparative example.
Specific embodiment
It is specifically described below and of the invention large scale calcium aluminium in steel is reduced by control tundish immersed nozzle decarburization
The method of hydrochlorate field trash.
Since tundish has to pass through baking before the use, and the system toasted can be to tundish immersed nozzle decarburization
Depth has an impact, and in the art, is not quite similar by the effect and purpose of baking, some tundish only carry out small fire baking
It is roasting, in order to desiccation is played, and some steel mills need quick baking to 1000~1100 DEG C, the purpose is to improve heat
Stability improves the service life.In the art, the decarburized depth after common baking regime use is more than 1.5mm, mainly also
Baking Al is not recognized2O3- C matter tundish immersed nozzle system, the influence to decarburized depth, to influence the calcium in molten steel
The size and number of aluminate large-sized inclusions.The application has been put forward for the first time through baking process, reduces tundish immersion
Mouth of a river decarburization is come the method that reduces large scale calcium-aluminate field trash in steel.
Specifically: when test, select Al2O3The resistance to material of-C matter tundish immersed nozzle, it is desirable that the total baking time 3 of tundish
~5h toasts about 1~1.5h first, it is desirable that in this 1~1.5h, middle packet submersed nozzle temperature is maintained at about 100 DEG C；Immediately
Be brought rapidly up to 600 DEG C~800 DEG C, heating rate is 30 DEG C/min, is warming up to 600 DEG C~800 DEG C 0.5~3h of heat preservation；It protects
Temperature is followed by warming up to 900 DEG C, 30 DEG C/min of heating rate again, keeps the temperature about 1h, completes baking, guarantees Al2O3The leaching of-C matter tundish
Enter the formula mouth of a river inner wall of resistance to material decarburized depth≤1.5mm.
The present invention realizes control submersed nozzle decarburized depth by changing the system of baking, to obtain different immersions
Under the decarburized depth of the formula mouth of a river in corresponding steel bulky grain calcium-aluminate the amount of inclusions data.Pass through packet baking control in control
The key of submersed nozzle decarburization is to control resistance to material in the time of easy decarburization temperature range, above-mentioned Al2O3- C mass immersion type sprue
Resistance to material belongs to easy decarburization temperature range in 600 DEG C to 800 DEG C temperature ranges, by controlling resistance to material in 600 DEG C to 800 DEG C easy decarburizations
Time in section can control the decarburized layer deepness of final resistance to material well.And highest baking temperature is controlled at 900 DEG C, though across
Easy decarburization temperature range is crossed, but temperature is excessively high can still have an impact to resistance to material decarburization, it is de- that 900 DEG C of highest of control can reduce resistance to material
Carbon reduces open the phenomenon that tying cold steel since mouth of a river temperature is too low when pouring simultaneously.
Embodiment 1 and comparative example 1
(each 4 stream of left and right sides, i.e., left and right side tundish respectively has 4 centres to the 8 machines 8 stream tundish for selecting left and right sides separated
Packet submersed nozzle (Al2O3- C matter)), in the case where other technological parameters are constant, left and right sides tundish immersed nozzle is used
Same producer (e.g., Vesuvius), resistance to material chemical component are close, and meet Al2O3>=50%, the requirement of C >=1%.
Embodiment 1: left side tundish total baking time 5h is required when test, toasts about 1h first, it is desirable that in this 1h, in
Packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, 30 DEG C/min of heating rate, at 700 DEG C
Keep the temperature 3h；Then it is warming up to 900 DEG C again, keeps the temperature about 1h；
Comparative example 1: right side tundish total baking time 8h is required when test, toasts about 1h first, it is desirable that in this 1h, in
Packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 6h；Then it heats up again
To 900 DEG C, about 1h is kept the temperature.
By packet baking in control so that final two tundish, which are all drawn, pours 10 furnace, 20 pipe molten steel, resistance to material decarburization layer depth is measured
Large-sized inclusions in degree and steel.
Decarburized depth measurement method: the submersed nozzle for taking drawing to pour is placed under scanning electron microscope after sample preparation and measures
Decarburized depth takes the average value of 4 mouth of a river decarburized depths as the decarburized depth value under corresponding test parameters.
After drawing is poured, through the 4 tundish immersed nozzle decarburized depth about 1.2mm in detection left side；4, right side tundish
Submersed nozzle decarburized depth about 2.6mm.The quantity of large scale calcium-aluminate field trash in contrasting detection steel product, in left side
Between the steel contracted for fixed output quotas out detect 176 samples altogether, find 9 large scale calcium-aluminates (>=13 μm), have in average each sample
0.0511 large scale calcium-aluminate field trash；The steel of right side tundish output detect 184 samples altogether, find 19 big rulers
Very little calcium-aluminate (>=13 μm) averagely has 0.1033 large scale calcium-aluminate field trash in each sample.
Embodiment 2 and comparative example 2
(each 4 stream of left and right sides, i.e., left and right side tundish respectively has 4 centres to the 8 machines 8 stream tundish for selecting left and right sides separated
Packet submersed nozzle), in the case where other technological parameters are constant, left and right sides tundish immersed nozzle uses same producer
(e.g., Vesuvius), resistance to material chemical component are close, and meet Al2O3>=50%, the requirement of C >=1%.
Embodiment 2: the left side total baking time 3h of tundish, first baking 1h are required when test, it is desirable that in this 1h, middle packet leaching
Enter formula mouth of a river temperature and is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 1h；Then it is warming up to 900 again
DEG C, keep the temperature about 1h；
Comparative example 2: right side tundish total baking time 8h is required when test, toasts about 1h first, it is desirable that in this 1h, in
Packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 6h；Then it heats up again
To 900 DEG C, about 1h is kept the temperature.
By packet baking in control so that final two tundish, which are all drawn, pours 10 furnace, 20 pipe molten steel, resistance to material decarburization layer depth is measured
Large-sized inclusions in degree and steel.
After drawing is poured, through the 4 tundish immersed nozzle decarburized depth about 0.2mm in detection left side；4, right side tundish
Submersed nozzle decarburized depth about 2.5mm.The quantity of large scale calcium-aluminate field trash in contrasting detection steel product, in left side
Between the steel contracted for fixed output quotas out detect 173 samples altogether, find 2 large scale calcium-aluminates (>=13 μm), have in average each sample
0.0116 large scale calcium-aluminate field trash；The steel of right side tundish output detect 189 samples altogether, find 20 big rulers
Very little calcium-aluminate (>=13 μm) averagely has 0.1058 large scale calcium-aluminate field trash in each sample.
Embodiment 3 and comparative example 3
(each 4 stream of left and right sides, i.e., left and right side tundish respectively has 4 centres to the 8 machines 8 stream tundish for selecting left and right sides separated
Packet submersed nozzle), in the case where other technological parameters are constant, left and right sides tundish immersed nozzle uses same producer
(e.g., Vesuvius), resistance to material chemical component are close, and meet Al2O3>=50%, the requirement of C >=1%.
Embodiment 3: left side tundish total baking time 4h is required when test, toasts about 1h first, it is desirable that in this 1h, in
Packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 2h；Then it heats up again
To 900 DEG C, about 1h is kept the temperature；
Comparative example 3: right side tundish total baking time 10h is required when test, toasts about 1h first, it is desirable that in this 1h,
Middle packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 8h；Then it rises again
Temperature keeps the temperature about 1h to 900 DEG C.By packet baking in control so that final two tundish, which are all drawn, pours 10 furnace, 20 pipe molten steel, measurement
Large-sized inclusions in the decarburized layer deepness of resistance to material and steel.
After drawing is poured, through the 4 tundish immersed nozzle decarburized depth about 0.9mm in detection left side；4, right side tundish
Submersed nozzle decarburized depth about 3.7mm.The quantity of large scale calcium-aluminate field trash in contrasting detection steel product, in left side
Between the steel contracted for fixed output quotas out detect 179 samples altogether, find 6 large scale calcium-aluminates (>=13 μm), have in average each sample
0.0335 large scale calcium-aluminate field trash；The steel of right side tundish output detect 188 samples altogether, find 27 big rulers
Very little calcium-aluminate (>=13 μm) averagely has 0.1436 large scale calcium-aluminate field trash in each sample.
Comparative example 3 ': right side tundish total baking time 4h is required when test, toasts about 1h first, it is desirable that in this 1h,
Middle packet submersed nozzle temperature is maintained at about 100 DEG C；And then it being brought rapidly up to 700 DEG C, heating rate is 30 DEG C/min,
700 DEG C of heat preservation 2h；Then it is warming up to 1200 DEG C, 30 DEG C/min of heating rate again, keeps the temperature about 1h.
After the drawing of comparative example 3 ' is poured, through the 4 tundish immersed nozzle decarburized depth about 1.0mm in detection right side.Comparison
The quantity of large scale calcium-aluminate field trash in steel product is detected, the steel of right side tundish output detect 173 samples altogether,
It was found that 8 large scale calcium-aluminates (>=13 μm), averagely have 0.0462 large scale calcium-aluminate field trash in each sample.
Embodiment 4 and comparative example 4
(each 4 stream of left and right sides, i.e., left and right side tundish respectively has 4 centres to the 8 machines 8 stream tundish for selecting left and right sides separated
Packet submersed nozzle), in the case where other technological parameters are constant, left and right sides tundish immersed nozzle uses same producer
(e.g., Vesuvius), resistance to material chemical component are close, and meet Al2O3>=50%, the requirement of C >=1%.
Embodiment 4: left side tundish total baking time 3h is required when test, toasts about 1.5h first, it is desirable that in this 1.5h
Interior, middle packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 0.5h；Then
It is warming up to 900 DEG C again, keeps the temperature about 1h；
Comparative example 4: right side tundish total baking time 8h is required when test, toasts about 1.5h first, it is desirable that in this 1.5h
Interior, middle packet submersed nozzle temperature is maintained at about 100 DEG C；And then it is brought rapidly up to 700 DEG C, in 700 DEG C of heat preservation 5.5h；Then
It is warming up to 900 DEG C again, keeps the temperature about 1h.By packet baking in control so that final two tundish, which are all drawn, pours 10 furnace, 20 pipe molten steel,
Measure large-sized inclusions in the decarburized layer deepness of resistance to material and steel.
After drawing is poured, through the 4 tundish immersed nozzle decarburized depth about 0.1mm in detection left side；4, right side tundish
Submersed nozzle decarburized depth about 2.4mm.The quantity of large scale calcium-aluminate field trash in contrasting detection steel product, in left side
Between the steel contracted for fixed output quotas out detect 180 samples altogether, find 1 large scale calcium-aluminate (>=13 μm), have in average each sample
0.0056 large scale calcium-aluminate field trash；The steel of right side tundish output detect 181 samples altogether, find 16 big rulers
Very little calcium-aluminate (>=13 μm) averagely has 0.0884 large scale calcium-aluminate field trash in each sample.
The data summary table of 1 embodiment of table and comparative example
Claims (5)
1. a kind of method for reducing large scale calcium-aluminate field trash in steel, it is characterised in that: the following steps are included:
(1) pass through control Al2O3The decarburized depth of the resistance to material of-C mass immersion type sprue makes the inner wall of resistance to material decarburized depth≤1.5mm, subtracts
Large scale calcium-aluminate field trash in few steel；
(2) the main constituent element of the liner of resistance to material is Al2O3And C, by mass percentage, wherein Al2O3>=50%, C >=1%.
2. the method according to claim 1 for reducing large scale calcium-aluminate field trash in steel, it is characterised in that: large scale
The size of calcium-aluminate field trash is >=13 μm.
3. a kind of method for reducing large scale calcium-aluminate field trash in steel according to claim 2, it is characterised in that: big
The ingredient of size calcium-aluminate field trash is 0.56≤CaO (wt%)/Al2O3(wt%)≤3.
4. the method according to claim 1 for reducing large scale calcium-aluminate field trash in steel, it is characterised in that: pass through baking
Baking degree controls decarburized depth≤1.5mm of the resistance to material of submersed nozzle.
5. the method according to claim 4 for reducing large scale calcium-aluminate field trash in steel, it is characterised in that: specific to dry
Baking degree are as follows:
Select Al2O3- C matter tundish immersed nozzle, it is desirable that the total 3~5h of baking time of submersed nozzle, first baking 1~
1.5h, it is desirable that in this 1~1.5h, middle packet submersed nozzle temperature is maintained at 100 DEG C；And then be brought rapidly up to 600 DEG C~
800 DEG C, it is warming up to 600 DEG C~800 DEG C 0.5~3h of heat preservation；900 DEG C are warming up to after heat preservation again, in 900 DEG C of heat preservation 1h.
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| CN110982984A (en) * | 2019-12-05 | 2020-04-10 | 中天钢铁集团有限公司 | Production process of Al deoxidized non-calcium treated steel |
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