CN115592084A - Method for high-speed continuous casting of super austenitic stainless steel plate blank - Google Patents
Method for high-speed continuous casting of super austenitic stainless steel plate blank Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 89
- 238000009749 continuous casting Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 97
- 239000010959 steel Substances 0.000 claims abstract description 97
- 239000002131 composite material Substances 0.000 claims abstract description 69
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 30
- 239000011733 molybdenum Substances 0.000 claims abstract description 30
- 238000005266 casting Methods 0.000 claims abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims description 21
- 230000004907 flux Effects 0.000 claims description 20
- 238000005476 soldering Methods 0.000 claims description 18
- 239000000498 cooling water Substances 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 abstract description 5
- 230000008023 solidification Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000009991 scouring Methods 0.000 abstract description 3
- 238000006213 oxygenation reaction Methods 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 238000007654 immersion Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 208000029154 Narrow face Diseases 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 3
- 229960001763 zinc sulfate Drugs 0.000 description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention belongs to the technical field of stainless steel continuous casting, and particularly relates to a method for high-speed continuous casting of a super austenitic stainless steel slab. According to the invention, the composite steel band which takes the high-chromium-nickel low-molybdenum austenitic stainless steel band as the inner layer and the outer layer and takes the super austenitic stainless steel band as the middle layer is fed into the crystallizer, so that the oxidation of the super austenitic stainless steel band in the middle layer is prevented by the high-chromium-nickel low-molybdenum austenitic stainless steel band which is difficult to oxidize, the oxidation degree of the super austenitic stainless steel band in the band feeding process is reduced, and the negative effects of oxygenation, inclusion increase and the like are avoided; utilize composite steel band to hinder the washing away of efflux to the primary billet shell simultaneously, combine composite steel band to the hindrance effect of efflux and the heat diffusion after the composite steel band of feeding, reduce the inside temperature of composite steel band in the continuous casting process, alleviate casting blank primary billet shell and receive the scouring degree, promote the growth of solidification billet shell, increase the primary billet shell thickness of continuous casting billet, promote the billet shell and bear the stress capacity, reduce the breakout risk, improve throwing speed.
Description
Technical Field
The invention belongs to the technical field of stainless steel continuous casting, and particularly relates to a method for high-speed continuous casting of a super austenitic stainless steel slab.
Background
Continuous casting technology is taken as a marking technology of the revolution of the steel industry in the 50 s, and gradually replaces the traditional die casting technology to become the mainstream casting blank forming technology after the emergence of the technology, and most steel enterprises realize the full continuous casting production nowadays. The continuous casting process includes continuously condensing molten steel into hard shell in water cooled crystallizer, feeding steel strip into the crystallizer via feeding belt, drawing out continuously from the outlet below the crystallizer, water spraying to cool, solidifying and cutting into blank. The steel strip fed in the strip feeding process is melted in the crystallizer to absorb heat, so that the crystallization process of the molten steel can be improved, and the steel strip used for feeding the strip is a common steel strip with the same composition as the molten steel in the crystallizer.
The super austenitic stainless steel has high alloy component content, large solid-liquid phase line temperature difference, large mushy zone width, slow forming speed of a solidified shell, serious volume shrinkage in the solidification process, air gaps formed between a crystallizer and a plate blank, reduced heat transfer, further prolonged generation time of the solidified shell, uneven self cooling of the solidified shell to generate stress concentration, and easy generation of cracks on the surface of the plate blank. Affected by insufficient strength of the solidified shell, the blank drawing speed in the production process of the super austenitic stainless steel cannot be increased, and the production efficiency is low.
At present, researchers develop various technologies to meet the requirements of high-speed continuous casting, the research is mainly focused on two aspects of a crystallizer and covering slag, and a patent with publication number of CN211758438U discloses an immersion nozzle for high-speed continuous casting of small square billets. Patent publication No. CN205020776U discloses a molten steel precooling apparatus for a high-speed continuous casting machine, which increases the solidification speed and grain refinement of molten steel in a mold and increases the continuous casting drawing speed by reducing the degree of superheat of the molten steel before entering the mold. However, the speed of the existing continuous casting technology is still slow, and the requirement of high-speed continuous casting cannot be well met.
Disclosure of Invention
The invention aims to provide a method for continuously casting a super austenitic stainless steel slab at high speed, which can improve the slab drawing speed of the super austenitic stainless steel slab.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a method for high-speed continuous casting of a super austenitic stainless steel slab, which comprises the following steps:
(1) Sequentially superposing a high-chromium-nickel low-molybdenum austenitic stainless steel strip, a super austenitic stainless steel strip and a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and adding soldering flux between the two adjacent layers of steel strips to perform four-side welding edge sealing treatment to obtain a composite steel strip;
(2) Starting a continuous casting device, feeding the composite steel strip into a crystallizer after the continuous casting process is stable for high-speed continuous casting, wherein the blank drawing speed of the high-speed continuous casting is 0.2-0.6 m/min;
the chemical components of the super austenitic stainless steel strip comprise C less than or equal to 0.04wt%, mn less than or equal to 5.00wt%, cr:19.0wt% -26.0 wt%, ni:17.0wt% -26.0 wt%, mo:2.0wt% -8.0 wt%, N:0.15wt% -0.58 wt%, cu:0.20 to 1.20 weight percent, and the balance of Fe;
the chemical components of the high-chromium-nickel low-molybdenum austenitic stainless steel strip comprise C less than or equal to 0.08wt%, si less than or equal to 1.00wt%, mn less than or equal to 2.00wt%, P less than or equal to 0.045wt%, S less than or equal to 0.030wt%, cr:24.0wt% -26.0 wt%, ni:19.0 to 22.0 weight percent, and the balance of Fe.
Preferably, the thickness of the super austenitic stainless steel strip accounts for 50-70% of the total thickness of the composite steel strip.
Preferably, the device for high-speed continuous casting is a vertical slab continuous casting machine and comprises a rotating wheel, a traction device, a feeding belt guide groove, a slag discharge device and a crystallizer, wherein a submerged nozzle is arranged in the crystallizer;
the feeding crystallizer of the composite steel strip specifically comprises the following steps: and rolling and compacting the composite steel strip by a traction device under the action of a rotating wheel, sequentially passing through the strip feeding guide groove and the slag discharging device, and simultaneously feeding the composite steel strip into the crystallizer at two sides of a submerged nozzle of the crystallizer, wherein the feeding depth of the composite steel strip is lower than the height of the submerged nozzle.
Preferably, the distance between the feeding position of the composite steel strip and a submerged nozzle is 0.3 v-0.7v m, and v is the throwing speed.
Preferably, the thickness of the composite steel strip is d = K 1 v mm, width w = K 2 d mm, wherein K 1 Is 5 to 15, K 2 Is 5 to 10.
Preferably, the feeding speed of the composite steel strip is calculated by the following formula:
wherein V is the feeding speed of the composite steel belt, K 3 The value range of (1) is 0.1-0.3, and l is the distance between the feeding position of the composite steel strip and the submerged nozzle.
Preferably, the height of the submerged nozzle is calculated by the following formula:
wherein h is the height of the submerged nozzle, K 4 The value range of (A) is 10 to 25.
Preferably, the flow rate of the cooling water on the narrow side of the crystallizer is calculated by the following formula:
wherein Q is 1 Cooling water flow rate, K, for the narrow sides of the crystallizer 5 The value range of (A) is 0.01-0.02;
preferably, the flow rate of the broad-side cooling water of the crystallizer is calculated by the following formula:
wherein Q is 2 For the wide-face cooling water flow, K, of the crystallizer 6 The value range of (A) is 1.5-2.5, D is the thickness of the continuous casting slab, and L is the width of the continuous casting slab.
Preferably, the casting temperature of the crystallizer is 1405-1440 ℃.
Preferably, the soldering flux is stainless steel soldering flux.
The invention provides a method for high-speed continuous casting of a super austenitic stainless steel slab, which comprises the steps of feeding a composite steel strip which takes a high-chromium-nickel low-molybdenum austenitic stainless steel strip as an inner layer and a high-chromium-nickel low-molybdenum austenitic stainless steel strip as an intermediate layer into a crystallizer, and taking the high-chromium-nickel low-molybdenum austenitic stainless steel strip which is difficult to oxidize to prevent the oxidation of the super austenitic stainless steel strip in the intermediate layer, so that the oxidation degree of the super austenitic stainless steel strip in the strip feeding process is reduced, and the negative effects of oxygenation, inclusion increase and the like are avoided; utilize composite steel band to hinder the erodeing of efflux to the primary billet shell simultaneously, combine the composite steel band to the fluidic hindrance effect and the heat diffusion after the feeding composite steel band, reduce the inside temperature of super austenitic stainless steel slab among the continuous casting process, alleviate casting blank primary billet shell and receive the scouring degree, reduce solidification forward position temperature through diffusion and convection action, promote the growth of solidification shell, increase continuous casting blank primary billet shell thickness, promote the billet shell and bear the stress capacity, and then can improve super austenitic stainless steel slab throwing speed and production efficiency, reduce the breakout risk simultaneously. In addition, the influence of the melting of the high-chromium-nickel low-molybdenum austenitic stainless steel strip on the components of the molten steel is small, and the obtained product is still super austenitic stainless steel. The method can improve the blank drawing speed of the super austenitic stainless steel plate blank to 0.8m/min, and is suitable for the continuous casting production of the super austenitic stainless steel plate blank with the width of 800-1400 mm and the thickness of 200-250 mm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of a composite steel strip obtained by the present invention; wherein, 1 is a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and 2 is a super austenitic stainless steel strip;
FIG. 2 is a schematic view of the construction of the band feeding system of the present invention; wherein, 1 is a rotating wheel, 2 is a composite steel belt, 3 is a traction device, 4 is a belt feeding guide groove, 5 is a slag discharging device (slag avoiding device), and 6 is a crystallizer;
FIG. 3 is a graph comparing the drawing rates of example 1, example 2 and comparative example 1 according to the present invention;
FIG. 4 is a graph comparing primary shells at the outlet of the crystallizer of the super austenitic stainless steel slabs obtained before and after the strip feeding in example 1 (left) and example 2 (right) according to the present invention, wherein the primary shells refer to portions higher than 0.8 of the liquid fraction.
Detailed Description
The invention provides a method for high-speed continuous casting of a super austenitic stainless steel slab, which comprises the following steps:
(1) Sequentially overlapping a high-chromium-nickel low-molybdenum austenitic stainless steel strip, a super austenitic stainless steel strip and a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and adding soldering flux between the two adjacent layers of steel strips to perform four-side welding and edge sealing treatment to obtain a composite steel strip;
(2) Starting a continuous casting device, feeding the composite steel strip into a crystallizer after the continuous casting process is stable for high-speed continuous casting, wherein the blank drawing speed of the high-speed continuous casting is 0.2-0.6 m/min;
the chemical components of the super austenitic stainless steel strip comprise C less than or equal to 0.04wt%, mn less than or equal to 5.00wt%, cr:19.0wt% -26.0 wt%, ni:17.0wt% -26.0 wt%, mo:2.0wt% -8.0 wt%, N:0.15wt% -0.58 wt%, cu:0.20 to 1.20 weight percent, and the balance of Fe;
the chemical components of the high-chromium-nickel low-molybdenum austenitic stainless steel strip comprise C less than or equal to 0.08wt%, si less than or equal to 1.00wt%, mn less than or equal to 2.00wt%, P less than or equal to 0.045wt%, S less than or equal to 0.030wt%, cr:24.0wt% -26.0 wt%, ni:19.0wt% -22.0 wt%, and the balance of Fe.
The method comprises the steps of sequentially superposing a high-chromium-nickel low-molybdenum austenitic stainless steel strip, a super austenitic stainless steel strip and a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and then adding soldering flux between the two adjacent steel strips to carry out four-side welding and edge sealing treatment to obtain the composite steel strip. In the invention, the thickness of the super austenitic stainless steel strip preferably accounts for 50-70%, more preferably 55-65%, and even more preferably 60% of the total thickness of the composite steel strip, and the specific structure of the composite steel strip is shown in fig. 1; the soldering flux is preferably a stainless steel soldering flux, and the stainless steel soldering flux preferably comprises one or more of a soldering flux containing phosphoric acid, a soldering flux containing ammonium chloride and a soldering flux containing zinc sulfate; the invention has no special requirements on the four-side welding edge sealing treatment and can be carried out by adopting common operation in the field.
In the present invention, the chemical composition of the super austenitic stainless steel strip includes C ≤ 0.04wt%, preferably 0.01wt% to 0.04wt%, more preferably 0.02wt% to 0.03wt%, mn ≤ 5.00wt%, preferably 1.00wt% to 5.00wt%, more preferably 2.00wt% to 4.00wt%, cr:19.0wt% to 26.0wt%, preferably 21.0wt% to 25.0wt%, more preferably 22.0wt% to 24.0wt%, ni:17.0 to 26.0wt%, preferably 19.0 to 24.0wt%, more preferably 21.0 to 23.0wt%, mo:2.0wt% to 8.0wt%, preferably 4.0wt% to 7.0wt%, more preferably 5.0wt% to 6.0wt%, N:0.15wt% to 0.58wt%, preferably 0.25wt% to 0.50wt%, more preferably 0.35wt% to 0.45wt%, cu:0.20wt% to 1.20wt%, preferably 0.40wt% to 1.00wt%, more preferably 0.60wt% to 0.80wt%, and the balance being Fe (33.18 wt% to 61.65 wt%), preferably 38wt% to 52wt%, more preferably 42wt% to 48wt%.
In the invention, the chemical components of the high-chromium-nickel low-molybdenum austenitic stainless steel strip comprise C less than or equal to 0.08wt%, preferably 0.02 to 0.08wt%, more preferably 0.04 to 0.06wt%, si less than or equal to 1.00wt%, preferably 0.20 to 1.00wt%, more preferably 0.50 to 0.80wt%, mn less than or equal to 2.00wt%, preferably 0.50 to 1.60wt%, more preferably 0.90 to 1.60wt%, P less than or equal to 0.045wt%, preferably 0.005 to 0.040wt%, more preferably 0.015 to 0.035wt%, S less than or equal to 0.030wt%, preferably 0.010 to 0.030wt%, more preferably 0.010 to 0.020wt%, cr:24.0wt% to 26.0wt%, preferably 24.5wt% to 25.5wt%, more preferably 25.0wt% to 25.3wt%, ni:19.0wt% -22.0 wt%, preferably 20.0wt% -21.0 wt%, more preferably 20.4wt% -20.8 wt%, and the balance of Fe (48.845 wt% -57.000 wt%), preferably 50wt% -56 wt%, more preferably 52wt% -54 wt%; the chemical components of the high-chromium-nickel low-molybdenum austenitic stainless steel strips on the two sides of the super austenitic stainless steel strip preferably keep the same, and the thicknesses of the high-chromium-nickel low-molybdenum austenitic stainless steel strips preferably keep the same.
After the composite steel strip is obtained, the continuous casting device is started, and the composite steel strip is fed into the crystallizer for high-speed continuous casting after the continuous casting process is stable. In the invention, the high-speed continuous casting withdrawal speed is 0.2-0.6 m/min, preferably 0.4-0.6 m/min, and more preferably 0.5m/min; the composite steel strip is fed into the crystallizer preferably by a strip feeding system; the belt feeding system preferably comprises a rotating wheel, a traction device, a belt feeding guide groove, a slag discharging device and a crystallizer,an immersion type water gap is arranged in the crystallizer; the depth of the submerged nozzle immersed into the molten steel is preferably 130-170 mm, and more preferably 150-170 mm; the slag discharging device is preferably a slag avoiding device; the chemical components of the molten steel in the crystallizer are preferably consistent with those of the super austenitic stainless steel strip; the casting temperature of the crystallizer is preferably 1405-1440 ℃, and more preferably 1410-1430 ℃; the cross section of the crystallizer is preferably 900mm multiplied by 210mm, and the specific structure of the belt feeding system is shown in FIG. 2; the preferable preference of the composite steel strip fed into the crystallizer is as follows: rolling and compacting the composite steel strip by a traction device under the action of a rotating wheel, sequentially passing through the strip feeding guide groove and the slag discharging device, and simultaneously feeding the composite steel strip into a crystallizer at two sides of a submerged nozzle of the crystallizer, wherein the feeding depth of the composite steel strip is lower than the height of the submerged nozzle; the invention has no special requirements on the rolling compaction and can adopt the common operation in the field; the distance between the feeding position of the composite steel strip and the submerged nozzle is preferably 0.3 v-0.7 v m (v is the throwing speed), more preferably 0.40 v-0.60 v m, and even more preferably 0.5v m; the thickness of the composite steel strip is preferably d = K 1 v mm, wherein K 1 Preferably 5 to 15, more preferably 8 to 12, and preferably w = K in width 2 dmm, wherein K 2 Preferably 5 to 10, more preferably 7 to 9; the apparatus for high-speed continuous casting is preferably a vertical slab caster.
In the present invention, the feeding speed of the composite steel strip is preferably calculated by the following formula:
wherein V is the feeding speed of the composite steel belt, K 3 The value range of (1) is preferably 0.1-0.3, more preferably 0.15-0.25, and l is the distance between the feeding position of the composite steel strip and the submerged nozzle.
In the present invention, the height of the submerged entry nozzle is preferably calculated by the following formula:
wherein h is the height of the submerged nozzle, K 4 The range of (b) is preferably 10 to 25, more preferably 15 to 20, and further preferably 17 to 19.
In the invention, the cooling water flow of the narrow side of the crystallizer is calculated by the following formula:
wherein Q is 1 Cooling water flow rate, K, for the narrow sides of the crystallizer 5 The range of (b) is preferably 0.01 to 0.02, more preferably 0.012 to 0.018, and further preferably 0.014 to 0.016.
In the present invention, the flow rate of the broad-side cooling water of the crystallizer is preferably calculated by the following formula:
wherein Q is 2 For the wide-face cooling water flow, K, of the crystallizer 6 The value range of (d) is preferably 1.5 to 2.5, more preferably 1.7 to 2.2, and still more preferably 1.9 to 2.1, d is the thickness of the continuous cast slab, and L is the width of the continuous cast slab. The chemical components of the super austenitic stainless steel slab prepared by the invention are as follows: c: less than or equal to 0.04wt%, mn: less than or equal to 5.00wt%, cr:19.0wt% -26.0 wt%, ni:17.0wt% -26.0 wt%, mo:2.0wt% -8.0 wt%, N:0.15wt% -0.58 wt%, cu:0.20wt% -1.20 wt% and the balance of Fe.
In order to further illustrate the invention, the following detailed description of the embodiments of the invention is given with reference to the accompanying drawings and examples, which are not to be construed as limiting the scope of the invention.
Comparative example 1
The casting is carried out by using a vertical slab caster with a crystallizer and the section size of 900mm multiplied by 210mm, wherein the casting speed is 0.4m/min, and a submerged nozzle is immersed into the molten steel to a depthUnder the condition that the degree is 150mm, the molten steel comprises the following chemical components: c =0.04wt%, mn =3.0wt%, cr =24.0wt%, ni =22.0wt%, mo =7.0wt%, N =0.5wt%, cu =0.5wt%, and the balance of Fe, and the flow rate of cooling water for controlling the wide face of the crystallizer is 300m 3 The flow rate of cooling water on the narrow surface of the crystallizer is 30m 3 And h, preparing a super austenitic stainless steel slab, wherein the chemical composition of the super austenitic stainless steel slab is as follows: c =0.04wt%, mn =3.0wt%, cr =24.0wt%, ni =22.0wt%, mo =7.0wt%, N =0.5wt%, cu =0.5wt%, and the balance Fe.
Example 1
The chemical components of the super austenitic stainless steel strip are as follows: c =0.04wt%, mn =3.0wt%, cr =24.0wt%, ni =22.0wt%, mo =7.0wt%, N =0.5wt%, cu =0.5wt%, and Fe balance; the high-chromium-nickel low-molybdenum austenitic stainless steel strip comprises the following chemical components: c =0.04wt%, si =1.0wt%, mn =2.0wt%, P =0.045wt%, S =0.030wt%, cr =24.0wt%, ni =22.0wt%, and the balance Fe;
sequentially superposing a high-chromium-nickel low-molybdenum austenitic stainless steel strip, a super austenitic stainless steel strip and a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and then adding a phosphoric acid-containing soldering flux, an ammonium chloride-containing soldering flux and a zinc sulfate-containing soldering flux between two adjacent steel strips to perform four-side welding edge sealing treatment to obtain a composite steel strip; the width of the obtained composite steel strip is 30mm, the thickness of the composite steel strip is 4mm, wherein the thickness of the super austenitic stainless steel strip accounts for 50% of the total thickness of the composite steel strip, and the high-chromium-nickel low-molybdenum austenitic stainless steel strips on the two sides have the same thickness;
the high-speed continuous casting is carried out by using a vertical slab caster with the section size of 900mm multiplied by 210mm of a crystallizer, the blank drawing speed is 0.4m/min, the immersion type water gap is immersed into molten steel with the depth of 150mm, the chemical composition of the molten steel in the crystallizer is consistent with that of a used super austenitic stainless steel strip, and the flow of cooling water on the wide surface of the crystallizer is controlled to be 300m 3 The flow rate of cooling water on the narrow surface of the crystallizer is 30m 3 H, after the continuous casting process is stable, controlling a belt feeding system (shown in figure 2), installing the composite steel belt on a steel belt rotating wheel 1, and passing the composite steel belt 2 through the traction wheelAnd the device 3 continuously enters the crystallizer 6 through the belt feeding guide groove 4 and the slag avoiding device 5, composite steel belts are symmetrically fed to two sides of a submerged nozzle of the crystallizer under the condition that the belt feeding speed is 0.0565m/s, the distance between the feeding position of the composite steel belts and the submerged nozzle is 225mm, a super austenitic stainless steel slab is prepared, and the obtained super austenitic stainless steel slab comprises the following chemical components: c =0.04wt%, mn =3.0wt%, cr =24.0wt%, ni =22.0wt%, mo =7.0wt%, N =0.5wt%, cu =0.5wt%, and Fe balance.
Example 2
The chemical components of the super austenitic stainless steel strip are as follows: c =0.04wt%, mn =4.0wt%, cr =23.0wt%, ni =21.0wt%, mo =7.0wt%, N =0.5wt%, cu =0.5wt%, and Fe balance; the high-chromium-nickel low-molybdenum austenitic stainless steel strip comprises the following chemical components: c =0.04wt%, si =0.5wt%, mn =2.0wt%, P =0.045wt%, S =0.030wt%, cr =23.0wt%, ni =21.0wt%, and the balance Fe;
sequentially superposing a high-chromium-nickel low-molybdenum austenitic stainless steel strip, a super austenitic stainless steel strip and a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and then adding a phosphoric acid-containing soldering flux, an ammonium chloride-containing soldering flux and a zinc sulfate-containing soldering flux between two adjacent steel strips to perform four-side welding edge sealing treatment to obtain a composite steel strip; the width of the obtained composite steel strip is 30mm, the thickness of the composite steel strip is 4mm, wherein the thickness of the high-chromium-nickel low-molybdenum austenitic stainless steel accounts for 45% of the thickness of the composite steel strip, and the thicknesses of the high-chromium-nickel low-molybdenum austenitic stainless steel strips on the two sides are the same;
the method comprises the steps of carrying out high-speed continuous casting by using a vertical slab caster with the cross section size of the crystallizer being 900mm multiplied by 210mm, wherein under the conditions that the blank drawing speed is 0.5m/min and the immersion type water gap is immersed into molten steel with the depth of 150mm, the chemical components of the molten steel are consistent with those of a used super austenitic stainless steel strip, and the flow of cooling water on the wide surface of the crystallizer is controlled to be 300m 3 The flow of cooling water on the narrow surface of the crystallizer is 30m 3 H, after the continuous casting process is stabilized, controlling a belt feeding system (as shown in figure 2), installing the composite steel belt on the rotating wheel 1, enabling the composite steel belt 2 to pass through the traction device 3, and continuously entering the crystallizer 6 through a belt feeding guide groove 4 and a slag avoiding device 5And (2) symmetrically feeding composite steel strips on two sides of a submerged nozzle of the crystallizer under the condition that the strip feeding speed is 0.07m/s, wherein the distance between the strip feeding position of the composite steel strips and the submerged nozzle is 225mm, and preparing a super austenitic stainless steel slab, wherein the obtained super austenitic stainless steel slab comprises the following chemical components: c =0.04wt%, mn =4.0wt%, cr =23.0wt%, ni =21.0wt%, mo =7.0wt%, N =0.5wt%, cu =0.5wt%, and the balance Fe.
Fig. 3 is a graph comparing the drawing speeds of example 1 and example 2 according to the present invention and comparative example 1, and fig. 4 is a graph comparing the primary shells of the super austenitic stainless steel slabs at the outlet of the crystallizer obtained before and after the band feeding in example 1 (left) and example 2 (right) according to the present invention. As can be seen from the graphs in FIGS. 3 and 4, the thickness of the narrow-face billet shell of the super austenitic stainless steel slab is increased by reducing the scouring degree of the jet flow on the billet shell, and the safety billet shell thickness at the outlet of the continuous casting slab crystallizer is judged to be larger than 15mm according to field experience, so that the absolute value of the blank drawing speed is increased from 0.4m/min to 0.5m/min, and the blank drawing speed is increased by 25% in the embodiment 2 of the invention.
The primary shell of the super austenitic stainless steel slabs at the outlet of the crystallizer obtained before and after the strip feeding in examples 1 (left) and 2 (right) of the present invention was measured, and the results are shown in fig. 4. According to the left histogram in fig. 4, under the same throwing speed condition, the thickness of the narrow-face shell of the super austenitic stainless steel slab can be increased from 14.0mm to 18.9mm in the embodiment 1 of the invention, and the thickness of the shell is increased by 35%; according to the right histogram in fig. 4, under the same throwing speed condition, the thickness of the narrow-face shell of the super austenitic stainless steel slab in the embodiment 2 of the invention can be increased from 6.8mm to 14.7mm, and the thickness of the shell is increased by 116%; therefore, the method provided by the invention can increase the thickness of the blank shell by feeding the composite steel strip.
From the above embodiments, the method provided by the invention can improve the blank drawing speed of the super austenitic stainless steel slab to 0.5m/min, further improve the production efficiency of the super austenitic stainless steel slab, and is suitable for the continuous casting production of the super austenitic stainless steel slab with the width of 800-1400 mm and the thickness of 200-250 mm.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.
Claims (10)
1. A method for continuously casting a super austenitic stainless steel slab at a high speed is characterized by comprising the following steps:
(1) Sequentially superposing a high-chromium-nickel low-molybdenum austenitic stainless steel strip, a super austenitic stainless steel strip and a high-chromium-nickel low-molybdenum austenitic stainless steel strip, and adding soldering flux between the two adjacent layers of steel strips to perform four-side welding edge sealing treatment to obtain a composite steel strip;
(2) Starting a continuous casting device, feeding the composite steel strip into a crystallizer after the continuous casting process is stable to carry out high-speed continuous casting, wherein the blank drawing speed of the high-speed continuous casting is 0.2-0.6 m/min;
the chemical components of the super austenitic stainless steel strip comprise C less than or equal to 0.04wt%, mn less than or equal to 5.00wt%, cr:19.0wt% -26.0 wt%, ni:17.0wt% -26.0 wt%, mo:2.0wt% -8.0 wt%, N:0.15wt% -0.58 wt%, cu:0.20 to 1.20 weight percent, and the balance of Fe;
the chemical components of the high-chromium-nickel low-molybdenum austenitic stainless steel strip comprise C less than or equal to 0.08wt%, si less than or equal to 1.00wt%, mn less than or equal to 2.00wt%, P less than or equal to 0.045wt%, S less than or equal to 0.030wt%, cr:24.0wt% -26.0 wt%, ni:19.0wt% -22.0 wt%, and the balance of Fe.
2. The method of claim 1, wherein the super austenitic stainless steel strip has a thickness of 50% to 70% of the total thickness of the composite steel strip.
3. The method according to claim 1, wherein the apparatus for high-speed continuous casting is a vertical slab caster comprising a runner, a drawing device, a belt-feeding guide groove, a slag discharge device, and a mold in which a submerged nozzle is provided;
the feeding crystallizer of the composite steel strip specifically comprises the following steps: and rolling and compacting the composite steel strip by a traction device under the action of a rotating wheel, sequentially passing through the strip feeding guide groove and the slag discharging device, and simultaneously feeding the composite steel strip into the crystallizer at two sides of a submerged nozzle of the crystallizer, wherein the feeding depth of the composite steel strip is lower than the height of the submerged nozzle.
4. The method according to claim 3, wherein the feeding position of the composite steel strip is spaced from the submerged entry nozzle by a distance of 0.3v to 0.7v, v being the withdrawal speed.
5. Method according to claim 4, characterized in that the thickness of the composite steel strip is d = K 1 v mm, width w = K 2 dmm, wherein K 1 Is 5 to 15, K 2 Is 5 to 10.
6. The method according to claim 3 or 4, wherein the feeding speed of the composite steel strip is calculated by the following formula:
wherein V is the feeding speed of the composite steel belt, K 3 The value range of (1) is 0.1-0.3, and l is the distance between the feeding position of the composite steel strip and the submerged nozzle.
7. The method of claim 6, wherein the height of the submerged entry nozzle is calculated by:
wherein h is the height of the submerged nozzle, K 4 The value range of (A) is 10 to 25.
8. Method according to claim 3 or 4, characterized in that the crystallizer cold water flow rate on the narrow sides is calculated by the following formula:
wherein Q is 1 Cooling water flow rate, K, for the narrow sides of the crystallizer 5 The value range of (A) is 0.01-0.02;
the flow rate of the cooling water on the wide surface of the crystallizer is calculated by the following formula:
wherein Q is 2 For the wide-face cooling water flow, K, of the crystallizer 6 The value range of (A) is 1.5-2.5, D is the thickness of the continuous casting slab, and L is the width of the continuous casting slab.
9. The method according to claim 1 or 3, characterized in that the casting temperature of the crystallizer is 1405-1440 ℃.
10. The method of claim 1, wherein the flux is a stainless steel flux.
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