CN114657457A - High-strength special steel plate for Ti microalloying protection and production method thereof - Google Patents
High-strength special steel plate for Ti microalloying protection and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 title abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 7
- 238000010583 slow cooling Methods 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910003296 Ni-Mo Inorganic materials 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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Abstract
The invention relates to a high-strength special steel plate for Ti microalloying protection and a production method thereof, belonging to the technical field of special steel production. The steel plate comprises the following components in percentage by weight: 0.29 to 0.36 percent of C, 0.30 to 0.45 percent of Si, 0.35 to 1.00 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 0.80 to 1.60 percent of Cr, 0.80 to 1.60 percent of Ni, 0.50 to 1.00 percent of Mo, 0.010 to 0.040 percent of Ti, 0.020 to 0.040 percent of Alt, 0.0018 to 0.0028 percent of B, less than or equal to 15ppm of [ O ], lessthan or equal to 20ppm of [ N ], lessthan or equal to 2ppm of [ H ], and the balance of Fe and inevitable impurities; the thickness of the steel plate is 15-30 mm. Compared with the prior art, only Ti is added to the Cr-Ni-Mo component system, Nb and V are not required to be added, and the overall manufacturing cost is reduced. Secondly, the high-strength special steel plate for protection of 15-30 mm can be produced through controlled rolling and offline heat treatment, the performance is not lower than that of products with the same grade and specification, the industrial production operability is strong, and the method is suitable for being popularized and applied in a large range in the technical field of production of high-strength special steel plates for protection.
Description
Technical Field
The invention belongs to the technical field of special steel production, and particularly relates to a high-strength special steel plate for Ti microalloying protection and a production method thereof.
Background
The high-strength special steel plate for protection needs to have ultrahigh strength and hardness, and also needs to have good plasticity, toughness and crack arrest performance so as to ensure that the steel plate does not collapse under the impact of a projectile and does not generate through cracking under the impact of multiple projectiles, thereby effectively reducing the impact force borne by a support behind the bulletproof steel plate. Data statistics shows that the annual demand of high-strength protective steel is more than 30 ten thousand tons, the high-strength protective steel is mainly applied to the fields of aircraft maintenance warehouses, shipbuilding, large industrial plants and workshops of national defense and civil airports, engineering machinery and the like, and the function and the status of the high-strength protective steel are very important.
Chinese patent CN111118412A provides a bulletproof steel plate and a heat treatment method thereof, and the main alloy elements of the steel plate are 0.3-1.0% of Ni, 0.45-0.55% of Cr and 0.25-0.35% of Mo, and 0.02-0.03% of Nb and 0.017-0.027% of Ti0.017; the steel plate has a length of 3.0 to 10.0m, a width of 1.0 to 2.0m, and a thickness of 2.2 to 8.0 mm.
Chinese patent CN109852779A provides a heat treatment method for civil bulletproof steel, and the main alloy elements of the steel plate are 0.75-1.1% of Cr, 1.8-2.2% of Ni, 0.25-0.45% of Mo, 0.15-0.25% of V, 0.015-0.025% of Nb00, and 0-0.01% of Re.
Chinese patent CN109930075A provides a bulletproof steel plate for armor and a manufacturing method thereof, wherein the main alloy elements of the steel plate are Ni 0.10-0.38%, Cr 0.80-1.50%, Mo 0.16-0.40%, and Ti 0.010-0.035%; the thickness range of the steel plate is 5-10 mm.
Chinese patent CN105088090A provides a bulletproof steel plate with tensile strength of 2000MPa and a manufacturing method thereof, the thickness of the steel plate is 6-22 mm, and the corresponding main alloy elements are 0.30-1.00% of Cr, 0.3-1.2% of Ni, 0.20-0.80% of Mo, 0.20-0.60% of Cu, 0.01-0.05% of Ti and 0.001-0.0035% of B. Chinese patent
CN111455289A provides a high-strength hot-rolled bulletproof steel plate and a manufacturing method thereof, and the main alloy elements of the steel plate are 0.80-1.30% of Cr, 1.00-1.80% of Ni, 0.15-0.50% of Mo, 0.05-0.20% of V and 0.005% -0.06% of Re.
Chinese patent CN103993235A provides a method for manufacturing a high-strength hot-rolled bulletproof steel plate, the thickness of the steel plate is 2-3 mm, and the corresponding main alloy elements are 0.3% -1.0% of Cr, less than or equal to 0.2% of Ti and Nb, and 0.0015% -0.0025% of B.
Chinese patent CN110079741A provides a bulletproof steel plate and a manufacturing method thereof, the steel plate is produced by a roll rolling and cover type annealing process, and the corresponding main alloy elements are 0.33-0.97% of Ni, 0.49-0.55% of Cr, 0.30-0.34% of Mo, 0.26-0.33% of Cu, 0.022-0.026% of Ti and 0.0016-0.0020% of B.
Chinese patent CN108441768A provides a high-strength penetration-resistant steel for a protective door and a heat treatment method thereof, the thickness of the steel plate is 20-80 mm, and the corresponding main alloy elements are 0.20-1.00% of Ni, 0.10-0.50% of Cr, 0.10-0.50% of Mo, less than or equal to 0.050% of Nb, less than or equal to 0.050% of V, less than or equal to 0.050% of Ti and 0.0005-0.0035% of B.
In summary, in the prior art, (1) the thickness of the steel plate for protection is mainly a coil plate with the thickness of less than 10mm, and more alloy elements such as Cr, Ni and Mo are added into the chemical components, so that the overall production cost is high; (2) along with the development and improvement of the military level, the steel puts forward more severe requirements on the strength and toughness performance of the steel, and certain contents of Nb, V and Ti microalloying elements are added in the research and development process, so that the production and manufacturing cost is further increased; (3) meanwhile, the organization performance regulation mechanism is more complex, and more research and development efforts are needed to be invested to fully excavate and play the coupling interaction of various alloy elements in the strength and toughness performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-strength special steel plate for Ti microalloying protection and a production method thereof, aiming at solving the problems. According to the invention, only Ti is added to a Cr-Ni-Mo component system, and the high-strength special steel plate for protection of 15-30 mm can be produced through controlled rolling and offline heat treatment.
The technical scheme of the invention is as follows:
a high-strength special steel plate for Ti microalloying protection comprises the following components in percentage by weight: 0.29 to 0.36 percent of C, 0.30 to 0.45 percent of Si, 0.35 to 1.00 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 0.80 to 1.60 percent of Cr, 0.80 to 1.60 percent of Ni, 0.50 to 1.00 percent of Mo, 0.010 to 0.040 percent of Ti, 0.020 to 0.040 percent of Alt, 0.0018 to 0.0028 percent of B, less than or equal to 15ppm of [ O ], lessthan or equal to 20ppm of [ N ], lessthan or equal to 2ppm of [ H ], and the balance of Fe and inevitable impurities; the thickness of the steel plate is 15-30 mm.
The preparation method of the high-strength special steel plate for Ti microalloying protection comprises the following steps: (1) smelting and pouring; (2) slowly cooling the plate blank; (3) heating and rolling; (4) cooling the steel plate; (5) and (4) carrying out heat treatment on the steel plate.
Preferably, in the step (1), LF + RH double refining is adopted for smelting, the plate blank is immediately taken off line and sent into a slow cooling pit after being sheared, the pit entry temperature is more than or equal to 400 ℃, the pit exit temperature is less than or equal to 100 ℃, the average temperature drop rate per hour is less than 2 ℃, and stacking is continued after pit exit to avoid being positioned at a tuyere position.
Preferably, in the step (2), the thickness of the slab is 110-300 mm.
Preferably, in the step (3), the initial rolling temperature of rough rolling is 1060-1120 ℃, the times of rough rolling passes are less than or equal to 7, and the integral reduction deformation rate is more than or equal to 60%; the initial rolling temperature of finish rolling is 840-900 ℃, the number of finish rolling passes is less than or equal to 7, the integral reduction deformation rate is more than or equal to 60%, and the final rolling temperature is more than or equal to 750 ℃.
Preferably, in the step (4), the steel plates are stacked and slowly cooled by means of covering below hot steel plates with the temperature of more than or equal to 400 ℃, and stacking at the tuyere position is avoided.
Preferably, in the step (5), the steel plate heat treatment comprises high-temperature quenching and low-temperature tempering, wherein the high-temperature quenching temperature is 880-920 ℃, the furnace charging mode is to warm furnace charging, and the heating coefficient is 1.4-1.8 mm/min; the low-temperature tempering temperature is 200-280 ℃, the charging mode is to warm charging, and the heating coefficient is 2.6-3.0 mm/min.
Preferably, the processing time interval of the high-temperature quenching and the low-temperature tempering is less than or equal to 48 h.
The invention has the beneficial effects that:
compared with the prior art, the invention provides a production method of a high-strength special steel plate for Ti microalloying protection, firstly, only Ti element is added on a Cr-Ni-Mo component system, Nb and V do not need to be added, and the integral manufacturing cost is reduced. Secondly, the high-strength special steel plate for protection of 15-30 mm can be produced through controlled rolling and offline heat treatment, the performance is not lower than that of products with the same grade and specification, the industrial production operability is strong, and the method is suitable for being popularized and applied in a large range in the technical field of production of high-strength special steel plates for protection.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
Example 1
A production method of a high-strength special steel plate for Ti microalloying protection comprises the following steps:
(1) smelting according to the following chemical components: 0.30 percent of C, 0.43 percent of Si, 0.90 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.80 percent of Cr, 1.1 percent of Ni, 0.70 percent of Mo, 0.016 percent of Ti, 0.025 percent of Alt, 0.0019 percent of B, less than or equal to 15ppm of [ O ], less than or equal to 20ppm of [ N ], less than or equal to 2ppm of [ H ], and the balance of Fe and inevitable impurities.
(2) Pouring to obtain a slab with the thickness of 110mm, feeding the slab into a slow cooling pit, wherein the pit entry temperature is about 560 ℃, the pit exit temperature is about 95 ℃, the average temperature drop rate per hour is 1.8 ℃, and continuously stacking after pit exit to avoid the slab from being positioned at a tuyere.
(3) Heating and rolling the plate blank, wherein the initial rolling temperature of rough rolling is 1100 ℃, the rough rolling is carried out for 7 times, and the integral reduction deformation rate is 63%; and (3) carrying out finish rolling at the initial rolling temperature of 880 ℃, carrying out finish rolling for 6 times, wherein the integral reduction deformation rate is 62.5%, and the final rolling temperature is 802 ℃, thus preparing the steel plate with the thickness of 15 mm.
(4) And stacking the hot rolled steel plate in a mode of covering the hot steel plate at the temperature of 408 ℃ below the hot steel plate, and slowly cooling to avoid stacking at the position of a tuyere.
(5) And (3) keeping the temperature of the slowly cooled steel plate at 890 ℃ for 25min, then quenching, keeping the temperature at 270 ℃ for 45min after 36h, and then cooling in the air to prepare a finished product steel plate.
(6) The yield strength of the finished steel plate is 1455MPa, the tensile strength is 1756MPa, the elongation after fracture is 14%, the Brinell hardness is 540HBW, and the low-temperature toughness at minus 40 ℃ is more than or equal to 28J.
Example 2
A production method of a high-strength special steel plate for Ti microalloying protection comprises the following steps:
(1) smelting according to the following chemical components: 0.29 percent of C, 0.35 percent of Si, 0.40 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 1.2 percent of Cr, 0.85 percent of Ni, 0.80 percent of Mo, 0.015 percent of Ti, 0.030 percent of Alt, 0.0020 percent of B, less than or equal to 15ppm of [ O ], less than or equal to 20ppm of [ N ], less than or equal to 2ppm of [ H ], and the balance of Fe and inevitable impurities.
(2) And pouring to obtain a slab with the thickness of 300mm, feeding the slab into a slow cooling pit, keeping the temperature of the slab in the pit at about 440 ℃, keeping the temperature of the slab out of the pit at about 98 ℃, keeping the average temperature drop rate per hour at 1.5 ℃, and continuously stacking the slab out of the pit to avoid the slab from being positioned at a tuyere.
(3) Heating and rolling the plate blank, wherein the initial rolling temperature of rough rolling is 1090 ℃, the rough rolling is carried out for 7 times, and the integral reduction deformation rate is 70%; and (3) carrying out finish rolling at the initial rolling temperature of 860 ℃ for 6 times, wherein the integral reduction deformation rate is 66%, and the final rolling temperature is 794 ℃, thus preparing the steel plate with the thickness of 30 mm.
(4) And stacking the hot rolled steel plate in a mode of covering the hot steel plate at the temperature of 420 ℃ below the hot steel plate, and slowly cooling to avoid stacking at the position of the tuyere.
(5) And (3) keeping the temperature of the slowly cooled steel plate at 910 ℃ for 48min, then quenching, keeping the temperature at 280 ℃ for 85min after 30h, and then air cooling to prepare the finished steel plate.
(6) The yield strength of the finished steel plate is 1405MPa, the tensile strength is 1711MPa, the elongation after fracture is 11 percent, and the Brinell hardness is 514HBW, and the low-temperature toughness at minus 40 ℃ is more than or equal to 24J.
Example 3
A production method of a high-strength special steel plate for Ti microalloying protection comprises the following steps:
(1) smelting according to the following chemical components: 0.31 percent of C, 0.41 percent of Si, 0.70 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 1.00 percent of Cr, 0.91 percent of Ni, 0.60 percent of Mo, 0.014 percent of Ti, 0.028 percent of Alt, 0.0021 percent of B, less than or equal to 15ppm of [ O ], less than or equal to 20ppm of [ N ], less than or equal to 2ppm of [ H ], and the balance of Fe and inevitable impurities.
(2) And pouring to obtain a slab with the thickness of 200mm, feeding the slab into a slow cooling pit, wherein the pit entry temperature is about 450 ℃, the pit exit temperature is about 98 ℃, the average temperature drop rate per hour is 1.5 ℃, and continuously stacking the slab after pit exit to avoid the slab being positioned at a tuyere position.
(3) Heating and rolling the plate blank, wherein the initial rolling temperature of rough rolling is 1080 ℃, the rough rolling is carried out for 7 times, and the overall reduction deformation rate is 72.5%; and (3) performing finish rolling at the initial rolling temperature of 840 ℃ for 6 times, wherein the integral reduction deformation rate is 64 percent, and the final rolling temperature is 770 ℃ to prepare a steel plate with the thickness of 20 mm.
(4) And stacking the hot rolled steel plates by using a mode of laying a cover below the hot steel plates with the temperature of 436 ℃ for slow cooling, and avoiding stacking at the position of a tuyere.
(5) And (3) keeping the temperature of the slowly cooled steel plate at 905 ℃ for 35min, then quenching, keeping the temperature at 285 ℃ for 56min after 35h, and then air cooling to prepare the finished steel plate.
(6) The yield strength of the finished steel plate is 1413MPa, the tensile strength is 1728MPa, the elongation after fracture is 12%, and the Brinell hardness is 523HBW, and the low-temperature toughness at-40 ℃ is more than or equal to 23J.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The high-strength special steel plate for Ti microalloying protection is characterized by comprising the following components in percentage by weight: 0.29 to 0.36 percent of C, 0.30 to 0.45 percent of Si, 0.35 to 1.00 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 0.80 to 1.60 percent of Cr, 0.80 to 1.60 percent of Ni, 0.50 to 1.00 percent of Mo, 0.010 to 0.040 percent of Ti, 0.020 to 0.040 percent of Alt, 0.0018 to 0.0028 percent of B, less than or equal to 15ppm of [ O ], lessthan or equal to 20ppm of [ N ], lessthan or equal to 2ppm of [ H ], and the balance of Fe and inevitable impurities; the thickness of the steel plate is 15-30 mm.
2. A method for preparing a high-strength special steel plate for Ti microalloying protection as defined in claim 1, which comprises the following steps: (1) smelting and pouring; (2) slowly cooling the plate blank; (3) heating and rolling; (4) cooling the steel plate; (5) and (4) carrying out heat treatment on the steel plate.
3. The method for preparing a high-strength special steel plate for Ti microalloying protection as claimed in claim 2, wherein in the step (1), LF + RH double refining is adopted for smelting, the plate blank is immediately taken off line and sent into a slow cooling pit after being sheared, the temperature of entering the pit is more than or equal to 400 ℃, the temperature of leaving the pit is less than or equal to 100 ℃, the average temperature drop rate per hour is less than 2 ℃, and stacking is continued after leaving the pit, so that the plate blank is prevented from being positioned at a tuyere.
4. The method for preparing a high-strength special steel plate for Ti microalloying protection as claimed in claim 2, wherein in the step (2), the thickness of the plate blank is 110-300 mm.
5. The method for preparing a high-strength special steel plate for Ti microalloying protection as claimed in claim 2, wherein in the step (3), the rough rolling initial rolling temperature is 1060-1120 ℃, the number of rough rolling passes is less than or equal to 7, and the integral reduction deformation rate is more than or equal to 60%; the initial rolling temperature of finish rolling is 840-900 ℃, the number of finish rolling passes is less than or equal to 7, the integral reduction deformation rate is more than or equal to 60%, and the final rolling temperature is more than or equal to 750 ℃.
6. The method for preparing a high-strength special steel plate for Ti microalloying protection as claimed in claim 2, wherein in the step (4), the steel plate is cooled by stacking and slow cooling in a manner that a hot steel plate with the temperature of more than or equal to 400 ℃ is covered below and then prevented from being stacked at the tuyere position.
7. The method for preparing a high-strength special steel plate for Ti microalloying protection as claimed in claim 2, wherein in the step (5), the steel plate heat treatment comprises high-temperature quenching and low-temperature tempering, wherein the high-temperature quenching temperature is 880-920 ℃, the charging mode is to warm charging, and the heating coefficient is 1.4-1.8 mm/min; the low-temperature tempering temperature is 200-280 ℃, the furnace charging mode is to warm furnace charging, and the heating coefficient is 2.6-3.0 mm/min.
8. A method for preparing a high strength special steel plate for Ti microalloying protection as claimed in claim 7, wherein the time interval between the high temperature quenching and the low temperature tempering is not more than 48 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210148003.4A CN114657457A (en) | 2022-02-17 | 2022-02-17 | High-strength special steel plate for Ti microalloying protection and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115341138A (en) * | 2022-07-12 | 2022-11-15 | 江阴兴澄特种钢铁有限公司 | High-strength protective steel plate and manufacturing method thereof |
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| CN105088090A (en) * | 2015-08-28 | 2015-11-25 | 宝山钢铁股份有限公司 | Armor plate with tensile strength being 2000 MPa and manufacturing method thereof |
| CN109652624A (en) * | 2019-01-04 | 2019-04-19 | 南京钢铁股份有限公司 | A kind of superhigh intensity protection steel and its manufacturing method |
| CN109930075A (en) * | 2019-04-12 | 2019-06-25 | 贝斯山钢(山东)钢板有限公司 | A kind of armoring armour plate and its manufacturing method |
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| CN105088090A (en) * | 2015-08-28 | 2015-11-25 | 宝山钢铁股份有限公司 | Armor plate with tensile strength being 2000 MPa and manufacturing method thereof |
| CN109652624A (en) * | 2019-01-04 | 2019-04-19 | 南京钢铁股份有限公司 | A kind of superhigh intensity protection steel and its manufacturing method |
| CN109930075A (en) * | 2019-04-12 | 2019-06-25 | 贝斯山钢(山东)钢板有限公司 | A kind of armoring armour plate and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115341138A (en) * | 2022-07-12 | 2022-11-15 | 江阴兴澄特种钢铁有限公司 | High-strength protective steel plate and manufacturing method thereof |
| CN115341138B (en) * | 2022-07-12 | 2024-04-19 | 江阴兴澄特种钢铁有限公司 | High-strength protective steel plate and manufacturing method thereof |
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