CN103938088B - A kind of sheet billet continuous casting method of resistance alloy Cr20AlY - Google Patents
A kind of sheet billet continuous casting method of resistance alloy Cr20AlY Download PDFInfo
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- CN103938088B CN103938088B CN201310023654.1A CN201310023654A CN103938088B CN 103938088 B CN103938088 B CN 103938088B CN 201310023654 A CN201310023654 A CN 201310023654A CN 103938088 B CN103938088 B CN 103938088B
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Abstract
The invention discloses a kind of sheet billet continuous casting method of resistance alloy Cr20AlY, comprise electric furnace successively and just refine operation, AOD refining procedure, ladle furnace refining operation and continuous casting working procedure, by adopting the controls such as accurate molten steel overheat, reasonably continuous casting casting speed, reasonably cooling system, thus produce the continuous casting steel billet of the resistance alloy Cr20AlY without defects such as surface longitudinal cracks.Produce resistance alloy sheet material by the method for sheet billet continuous casting, can import be substituted on the one hand, lead market, fill the domestic gaps; On the other hand, due to overcoming of the difficulty in the production that resistance alloy singularity the subject of knowledge and the object of knowledge causes, can improve enterprises' comprehensive competitiveness, simultaneously also for producing the valuable R&D and production experience of the hot rolled plate product such as Gao Ge, high alumina resistance alloy accumulation further later.
Description
Technical field
The present invention relates to the production technique of resistance alloy, more particularly, relate to a kind of sheet billet continuous casting method of resistance alloy Cr20AlY.
Background technology
As band after resistance alloy FeCrAl steel plate rolling, be mainly used in electric heating, resistance element.Start in recent years for making machine tail gas purifier for motor vehicle carrier.According to national environmental protection policy, truck tail gas purification will inevitably be released in recent years, and according to measuring and calculating, the industries such as truck tail gas purifier carrier will more than 20000 tons to resistance alloy FeCrAl band demand.At present, domestic resistance alloy FeCrAl band only can produce the heavy narrow strip of rouleau, and the production of heavy-weight coil wide strip is also in blank, and the development carrying out resistance alloy FeCrAl band is necessary.
Wherein, steel grade Cr20AlY is as the representative steel grade of resistance alloy FeCrAl; containing metal zirconium, rare earth element yttrium, aluminum content is high simultaneously, easily in crystallizer, forms Al2O3; affect covering slag composition; make covering slag, in casting process, sex change etc. occur, simultaneously it is comparatively responsive to pouring temperature etc., and slab easily produces the defects such as longitudinal crack; it is comparatively large that continuous casting process controls difficulty, and domestic current generally use die casting is produced.
Due to this steel grade system resistance alloy, there is higher aluminium content, in continuous casting production process, have in crystallizer that Al2O3 crystal form and crackle are to these two subject matters of temperature sensitivity, domestic Ge great producer has carried out a large amount of continuous casting production test, but no longer produces because solving this two problems.This steel grade adopts the production technique of electric furnace+AOD+LF+ die casting+hot rolling to produce primarily of certain iron and steel enterprise at home at present.
Summary of the invention
For the above-mentioned shortcoming existed in prior art, the object of this invention is to provide a kind of sheet billet continuous casting method of resistance alloy Cr20AlY, can guarantee that the resistance alloy Cr20AlY that sheet billet continuous casting is produced is surperficial without defects such as longitudinal cracks.
For achieving the above object, the present invention adopts following technical scheme:
The sheet billet continuous casting method of this resistance alloy Cr20AlY, comprise electric furnace successively and just refine operation, AOD refining procedure, ladle furnace refining operation and continuous casting working procedure, wherein, just refine in operation at electric furnace, by carrying out the low bonderizing of just steel-making liquid in direct current electric arc furnace, make the load melting molten steel become in 1600 ~ 1620 DEG C of temperature ranges of loading, and make residual phosphorus content in molten steel be down to less than 0.025%; In AOD refining procedure, in AOD refining furnace, carry out the low carbonizing treatment of refining liquid steel, make the carbon content of refining liquid steel drop to less than 0.007%; In ladle furnace refining operation, in AC system ladle refining furnace, carry out the low sulfidizing of refining liquid steel, make the sulphur content of refining liquid steel drop to less than 0.002%; In continuous casting working procedure, further comprising the steps of: the molten steel in ladle is poured into T-shaped tundish; Make the molten steel in tundish enter in crystallizer by submerged nozzle, the initial base shell that solidification of molten steel is formed also progressively moves down; After going out crystallizer, at secondary cooling zone by induction stirring, secondary cooling water cooling, be frozen into resistance alloy slab gradually.
Just refine in operation at electric furnace, by in the direct current electric arc furnace more than 40 tons, pass into galvanic current and be blown into oxygen, oxygen flux control is at 20 ~ 40 cubic metres of/ton of steel, and supplement the lime being not more than 8 kgs/tonne of steel in the process, and interval flows out oxidisability slag.
The capacity that described direct current electric arc furnace adopts is more than 40 tons, and described AOD refining furnace, the capacity of AC system ladle refining furnace all match with direct current electric arc furnace.
The capacity of described tundish is 16 tons; the speed control that molten steel pours into tundish 1.5 ~ 2.5 tons of molten steel/minute; in tundish, superheat of liquid steel controls at 30-40 DEG C; and to being poured into the molten steel of tundish in ladle; argon blowing seal long nozzle is adopted to be protected; to the molten steel in tundish, use tundish mold powder cover.
Production is of a size of the slab of 200mm × 1100 ~ 1300mm, and the casting speed control of continuous casting working procedure is at 0.50 ~ 0.70m/min; Production is of a size of the slab of 150mm × 1100 ~ 1300mm, and the casting speed control of continuous casting working procedure is at 0.80 ~ 1.00m/min.
Water coolant is adopted to cool to the crystallizer of continuous casting working procedure, water coolant uses soft water, water quality requirement is: total salt content is not more than 400mg/L, vitriol is not more than 150mg/L, muriate is not more than 50mg/L, and silicate is not more than 40mg/L, and particle in suspension is not more than 50mg/L, carbonate hardness is not more than 1 ~ 2 ° of dH, and pH value is 7 ~ 8.
Production is of a size of to the slab of 200mm × 1100 ~ 1300mm, the cooling water flow that crystallizer is wide is 2100 ~ 2400L/ minute, and the cooling water flow of leptoprosopy is 280 ~ 330L/ minute; Production is of a size of to the slab of 150mm × 1100 ~ 1300mm, the cooling water flow that crystallizer is wide is 2500 ~ 2900L/ minute, and the cooling water flow of leptoprosopy is 200 ~ 300L/ minute.
The intensity of secondary cooling of described secondary cooling water controls at 0.1-0.6L/kg.
In technique scheme, the sheet billet continuous casting method of resistance alloy Cr20AlY of the present invention, comprise electric furnace successively and just refine operation, AOD refining procedure, ladle furnace refining operation and continuous casting working procedure, by adopting the controls such as accurate molten steel overheat, reasonably continuous casting casting speed, reasonably cooling system, thus produce the continuous casting steel billet of the resistance alloy Cr20AlY without defects such as surface longitudinal cracks.Produce resistance alloy sheet material by the method for sheet billet continuous casting, can import be substituted on the one hand, lead market, fill the domestic gaps; On the other hand, due to overcoming of the difficulty in the production that resistance alloy singularity the subject of knowledge and the object of knowledge causes, can improve enterprises' comprehensive competitiveness, simultaneously also for producing the valuable R&D and production experience of the hot rolled plate product such as Gao Ge, high alumina resistance alloy accumulation further later.
Embodiment
The sheet billet continuous casting method of resistance alloy Cr20AlY of the present invention, comprise electric furnace successively and just refine operation, refining procedure and continuous casting working procedure, wherein refining procedure is divided into again AOD refining procedure (refining of argon oxygen top-bottom blowing stove) and ladle furnace refining operation (refining of BOTTOM ARGON BLOWING stove), and its concrete technology flow process is:
1, electric arc furnace just refines operation, carries out the low phosphatization of just steel-making liquid in 40 tons and above direct current electric arc furnace.By passing into alternating current and being blown into oxygen (oxygen flux control is at 20 ~ 40 cubic metres of/ton of steel), and supplement the lime of≤8 kgs/tonne of steel during the course, interval flows out oxidisability slag, make the load melting molten steel become in 1600 ~ 1620 DEG C of temperature ranges of loading, and make residual phosphorus content in molten steel be down to less than 0.025%.
2, on AOD refining furnace (capacity and direct current electric arc furnace match), carry out the low carbonization of refined molten steel, the carbon content controlling refined molten steel drops to 0.007%, and carries out allocating into of molten steel alloying constituent.
3, on ladle furnace refining (capacity and ac electric arc furnace match), mainly carry out the low sulfuration of refining liquid steel, control the sulphur content of refining liquid steel and drop to less than 0.002% and carry out the control that the fine setting of alloying constituent and molten steel enter continuous casting working procedure temperature.
4, when molten steel alloying constituent meets steel grade requirement, temperature meets continuous casting production working procedure requirement, and continuous casting working procedure, after the preparation works such as baking of tundish, ingot-guiding head installation complete, can carry out continuous casting working procedure.
First the molten steel in ladle is flowed into melting steel amount 16 tons, completely cleaning and internal surface fire-resistant coating must not crannied T-shaped tundish (melting steel amount controls at 16 tons, as melting steel amount is too small, in steel, to be mingled with floating interval of floating dock inadequate for macrobead, easy generation slag, melting steel amount is excessive, then molten steel temperature drop is very fast, the cast later stage easily produces low temperature molten steel, so-called T-shaped tundish refers to the molten steel accepting ladle and inject, and then the container of resistance to material of crystallizer is dispensed to by middle water containing opening), its molten steel flows into speed control 1.5 ~ 2.5 tons of molten steel/minute (casting rate is too fast, molten steel overflows tundish, casting rate is too slow, and Molten Steel Flow is unstable, reduces pulling speed of continuous casting, pouring time is extended, and the secondary oxidation degree of molten steel increases, and is unfavorable for controlling oxygen content in steel).
Molten steel in ladle is poured into the liquid stream of tundish, adopts argon blowing seal long nozzle to be protected, with reach a high temperature molten steel all the time with isolated from atmosphere.Meanwhile, to the molten steel in tundish, use tundish mold powder cover, with reach a high temperature molten steel all the time with the object of isolated from atmosphere.Then make the molten steel in tundish by submerged nozzle to enter in crystallizer (submerged nozzle refer to mouth of a river tundish molten steel being flowed into crystallizer be inserted into crystallizer molten steel surface under certain degree of depth, completely cut off the contact of beam and air, prevent molten steel beam from impacting on molten steel face and form splashing, stop secondary oxidation), adopt water coolant to cool to crystallizer (crystallizer water coolant uses soft water simultaneously, to the requirement of water quality be: total salt content is not more than 400mg/L, vitriol is not more than 150mg/L, muriate is not more than 50mg/L, silicate is not more than 40mg/L, particle in suspension is not more than 50mg/L, carbonate hardness is not more than 1-2 ° of dH, pH value 7-8).In water coolant and crystallizer regular oscillation, the initial base shell that solidification of molten steel is formed progressively moves down, after going out crystallizer, at secondary cooling zone by induction stirring, secondary cooling water cooling, be frozen into resistance alloy slab gradually, continuous casting resistance alloy slab size range is 200/150mm(slab thickness) × 1100 ~ 1300mm(width of plate slab).
In the present invention, the major control point of above-mentioned continuous casting working procedure is:
1, in continuous casting working procedure, in tundish, superheat of liquid steel to control in 30-40 DEG C that (more than 45 DEG C, billet surface produces longitudinal crack defect to superheating temperature; Superheating temperature, lower than 25 DEG C, easily causes the mouth of a river to freeze, and forces casting to be interrupted);
2,200mm × 1100 ~ 1300mm(slab thickness × width of plate slab) size of plate blank, continuous casting working procedure casting speed control is at 0.50-0.70m/min; In 150mm × 1100 ~ and 1300mm(slab thickness × width of plate slab) size of plate blank, continuous casting working procedure casting speed control is at 0.80 ~ 1.00m/min.If (pulling rate is too fast, and continuously cast bloom can not Homogeneous cooling, easily produces longitudinal crack; Pulling rate is excessively slow, then affect continuous caster throughput);
3, the cooling of continuous casting working procedure crystallizer adopts water coolant to carry out (crystallizer water coolant use soft water, to the requirement of water quality be: total salt content is not more than 400mg/L, vitriol is not more than 150mg/L, muriate is not more than 50mg/L, silicate is not more than 40mg/L, particle in suspension is not more than 50mg/L, and carbonate hardness is not more than 1-2 ° of dH, and pH value is 7 ~ 8).Crystallizer is combined to form by four pieces of copper coins, and wherein symmetrical between two, form bottomless tetragon, the face that longer limit is formed is called wide, and the face that shorter limit is formed is called leptoprosopy:
In 200mm × 1100 ~ and 1300mm(slab thickness × width of plate slab) section (section refers to the dimensions of producing slab), wide cooling water flow 2100-2400L/ minute, leptoprosopy cooling water flow 280-330L/ minute; In 150mm × 1100 ~ and 1300mm(slab thickness × width of plate slab) section, wide cooling water flow 2500-2900L/ minute, leptoprosopy cooling water flow 200-300L/ minute.
The intensity of secondary cooling of the secondary cooling water 4, in continuous casting working procedure controls at 0.1-0.6L/kg.Control can make the surface quality of continuously cast bloom better in this intensity of secondary cooling, intensity of secondary cooling is too small, then do not reach cooling performance.Intensity of secondary cooling is excessive, and continuously cast bloom surface easily occurs longitudinal crack.
Compared to the prior art, the present invention has following advantages:
1, continuous casting produces resistance alloy (Cr20AlY) relative to die casting production, and recovery rate improves greatly, improves production capacity, reduces production cost, adds the competitive power of enterprise;
2, equipment and technics highly versatile: separately must not add specific equipment; Its technique is suitable for the production of general resistance alloy;
3, technique suitability is wide: the production being suitable for general resistance alloy.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (5)
1. a sheet billet continuous casting method of resistance alloy Cr20AlY, is characterized in that:
Comprise electric furnace successively and just refine operation, AOD refining procedure, ladle furnace refining operation and continuous casting working procedure, wherein,
Just refine in operation at electric furnace, by carrying out the low bonderizing of just steel-making liquid in direct current electric arc furnace, making the load melting molten steel become in 1600 ~ 1620 DEG C of temperature ranges of loading, and making residual phosphorus content in molten steel be down to less than 0.025%;
In AOD refining procedure, in AOD refining furnace, carry out the low carbonizing treatment of refining liquid steel, make the carbon content of refining liquid steel drop to less than 0.007%;
In ladle furnace refining operation, in AC system ladle refining furnace, carry out the low sulfidizing of refining liquid steel, make the sulphur content of refining liquid steel drop to less than 0.002%;
In continuous casting working procedure, further comprising the steps of:
Molten steel in ladle is poured into T-shaped tundish;
In tundish, superheat of liquid steel controls at 30-40 DEG C;
Production is of a size of the slab of 200mm × 1100 ~ 1300mm, and the casting speed control of continuous casting working procedure is at 0.50 ~ 0.70m/min; Production is of a size of the slab of 150mm × 1100 ~ 1300mm, and the casting speed control of continuous casting working procedure is at 0.80 ~ 1.00m/min;
Make the molten steel in tundish enter in crystallizer by submerged nozzle, the initial base shell that solidification of molten steel is formed also progressively moves down; Water coolant is adopted to cool to crystallizer; Production is of a size of to the slab of 200mm × 1100 ~ 1300mm, the cooling water flow that crystallizer is wide is 2100 ~ 2400L/ minute, and the cooling water flow of leptoprosopy is 280 ~ 330L/ minute; Production is of a size of to the slab of 150mm × 1100 ~ 1300mm, the cooling water flow that crystallizer is wide is 2500 ~ 2900L/ minute, and the cooling water flow of leptoprosopy is 200 ~ 300L/ minute;
After going out crystallizer, at secondary cooling zone by induction stirring, secondary cooling water cooling, be frozen into resistance alloy slab gradually; The intensity of secondary cooling of secondary cooling water controls at 0.1-0.6L/kg.
2. the sheet billet continuous casting method of resistance alloy Cr20AlY as described in claim 1, is characterized in that,
Just refine in operation at electric furnace, by in the direct current electric arc furnace more than 40 tons, pass into alternating current and be blown into oxygen, oxygen flux control is at 20 ~ 40 cubic metres of/ton of steel, and supplement the lime being not more than 8 kgs/tonne of steel in the process, and interval flows out oxidisability slag.
3. the sheet billet continuous casting method of resistance alloy Cr20AlY as described in claim 2, is characterized in that,
The capacity that described direct current electric arc furnace adopts is more than 40 tons, and described AOD refining furnace, the capacity of AC system ladle refining furnace all match with direct current electric arc furnace.
4. the sheet billet continuous casting method of resistance alloy Cr20AlY as described in claim 1, is characterized in that:
The capacity of described tundish is 16 tons; the speed control that molten steel pours into tundish 1.5 ~ 2.5 tons of molten steel/minute, to the molten steel being poured into tundish in ladle, adopt argon blowing seal long nozzle to be protected; to the molten steel in tundish, use tundish mold powder cover.
5. the sheet billet continuous casting method of resistance alloy Cr20AlY as described in claim 1, is characterized in that:
Described water coolant uses soft water, and water quality requirement is: total salt content is not more than 400mg/L, and vitriol is not more than 150mg/L, muriate is not more than 50mg/L, and silicate is not more than 40mg/L, and particle in suspension is not more than 50mg/L, carbonate hardness is not more than 1 ~ 2 ° of dH, and pH value is 7 ~ 8.
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| CN113403449B (en) * | 2021-06-11 | 2022-09-20 | 山西太钢不锈钢股份有限公司 | Production method for wide steel strip iron-chromium-aluminum continuous casting slab rare earth alloying |
| CN114210939B (en) * | 2021-12-09 | 2023-10-24 | 山西太钢不锈钢股份有限公司 | Method for eliminating slag strips in continuous casting process of iron-chromium aluminum plate blank |
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