CN111235488A - Bulletproof steel plate and preparation method and application thereof - Google Patents
Bulletproof steel plate and preparation method and application thereof Download PDFInfo
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- CN111235488A CN111235488A CN201911350067.7A CN201911350067A CN111235488A CN 111235488 A CN111235488 A CN 111235488A CN 201911350067 A CN201911350067 A CN 201911350067A CN 111235488 A CN111235488 A CN 111235488A
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- 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
- 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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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides a bulletproof steel plate, which has the advantages of high strength, light weight and thin specification by adding certain contents of elements such as Cr, Mo, V, Als (acid-soluble aluminum) and the like and strictly controlling the proportion of each element; the invention also provides a preparation method of the bulletproof steel plate, which can exert the effects of precipitation strengthening and grain refining of added alloy elements to the greatest extent by controlling the working procedures of heating, rolling, coiling, heat treatment and the like so as to ensure low deformation resistance and high strength of the steel plate during rolling, simultaneously has good forming performance, can obtain a high-strength steel plate with a martensite structure, can be well applied to various fields of vehicles, counters, furniture and the like, and has good application value.
Description
Technical Field
The invention relates to the technical field of metal material processing and production, in particular to a bulletproof steel plate and a preparation method and application thereof.
Background
With the development of advanced technologies of military weapons, which are different day by day, the protection requirements of bulletproof vehicles are higher and higher, and the bulletproof vehicles have different defense functions, so that the bulletproof vehicles have flexible maneuverability and damage resistance besides being capable of resisting attacks of fatal bullets and explosive fragments. With the trend of reducing weight and lightening weight of a bullet-proof vehicle and the trend of improving safety, special vehicle manufacturers have strong requirements on ultrathin bullet-proof steel plates, and hope that steel enterprises can provide bullet-proof steel with high strength and lightening weight and meeting the processing and using requirements.
At present, the components of the ultrahigh-strength steel for bulletproof mainly comprise CrNiMo systems, MnB systems and the like, and are generally produced by smelting, continuous casting, hot rolling, quenching, tempering and other technological methods, and the ultrahigh-strength steel can be directly used in a hot rolling state.
CN105088090A discloses an alloy system which is Cu-containing CrNiMoTiB series bulletproof steel, and the cloth hardness of the steel plate can reach 600HB after quenching and tempering treatment; the ARMOX series armor of SSAB company uses CrNiMo series, and the hardness of the steel plates with different carbon contents reaches 280-640HB after quenching and tempering treatment; the SSAB company DOMEX series uses a high-cleanliness MnCrB alloy system, wherein the hardness of alloy steel with 0.3 percent of carbon content reaches 500HB, but the strength of the bulletproof steel is still low, and the problem that the bulletproof steel is not light and thin enough is not solved.
CN103993235A discloses a method for manufacturing a high-strength hot-rolled bulletproof steel plate, wherein an alloy system adopts SiMnCrNbTiB, the components do not contain Ni, the hardness of the steel plate after quenching and tempering treatment reaches 500HB, but the bulletproof steel has lower strength and the requirement of light and thin degree is not realized.
CN100359034C discloses a high-strength hot-rolled bulletproof steel sheet, but its strength only reaches 1000MPa, the strength is still low and the requirement of lightness and thinness is not realized.
In conclusion, the existing bulletproof steel still has the defects of insufficient strength or insufficient light and thin degree, and the like, and the problem of how to produce a bulletproof steel plate with high strength, light weight, thin specification and good deformability through component design and targeted design of a hot rolling controlled cooling production process and a heat treatment process under the condition of conventional production process equipment is the problem which is urgently required to be solved at present.
Therefore, it is required to develop a high-strength, lightweight and thin-gauge steel for bulletproof and a process for preparing the same.
Disclosure of Invention
In order to solve the technical problems, the invention provides a bulletproof steel plate, which is characterized in that a certain content of elements such as Cr, Mo, V, Als and the like are added on the basis of the prior art, and the proportion of each element is strictly controlled, so that the steel plate has the advantages of high strength, light weight and thin specification; the preparation method of the bulletproof steel plate can exert the effects of precipitation strengthening and grain refining of the added alloy elements to the greatest extent by controlling the working procedures of heating, rolling, coiling, heat treatment and the like so as to ensure low deformation resistance and high strength of the steel plate during rolling, simultaneously has good forming performance, can obtain a light, thin and high-strength steel plate with a martensite structure, solves the problem that the steel plate in the prior art is not light and thin enough, can be well applied to various fields needing bulletproof and explosion-proof, such as vehicles, counters or furniture and the like, and has good application value.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a bulletproof steel plate, which comprises the following components in percentage by mass: c: 0.26 to 0.31%, Si: 0.20 to 0.40%, Mn: 0.75-1.10%, Ni: 1.05-1.30%, Cr: 0.75 to 1.10%, Mo: 0.25-0.45%, V: 0.085-0.105%, Als: 0.020-0.060%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, N is less than or equal to 0.003%, and the balance is Fe and inevitable impurities.
The content of C in the steel sheet of the present invention is 0.26 to 0.31%, and may be, for example, 0.26%, 0.27%, 0.28%, 0.29%, 0.30%, or 0.31%.
The content of Si in the steel sheet is 0.20 to 0.40%, and may be, for example, 0.20%, 0.21%, 0.22%, 0.23%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.30%, 0.32%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, or 0.40%.
The steel sheet may contain 0.75 to 1.10% of Mn, for example, 0.75%, 0.78%, 0.80%, 0.82%, 0.84%, 0.85%, 0.88%, 0.90%, 0.92%, 0.94%, 0.95%, 0.96%, 0.98%, 1.0%, 1.04%, 1.05%, 1.08%, or 1.1%.
The content of Ni in the steel sheet is 1.05 to 1.30%, and may be, for example, 1.05%, 1.07%, 1.09%, 1.1%, 1.12%, 1.15%, 1.18%, 1.20%, 1.22%, 1.25%, 1.28%, or 1.30%.
The steel sheet may contain 0.75 to 1.10% of Cr, for example, 0.75%, 0.78%, 0.80%, 0.82%, 0.84%, 0.85%, 0.88%, 0.90%, 0.92%, 0.94%, 0.95%, 0.96%, 0.98%, 1.0%, 1.04%, 1.05%, 1.08%, or 1.1%.
The content of Mo in the steel sheet is 0.25 to 0.45%, and may be, for example, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.30%, 0.32%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.40%, 0.42%, or 0.45%.
The content of V in the steel sheet is 0.085 to 0.105%, and may be, for example, 0.085%, 0.088%, 0.089%, 0.090%, 0.092%, 0.095%, 0.096%, 0.097%, 0.099%, 0.100%, 0.102%, or 0.105%.
The content of Als in the steel sheet may be 0.020 to 0.060%, for example, 0.020%, 0.025%, 0.030%, 0.035%, 0.040%, 0.045%, 0.050%, 0.055%, or 0.060%.
Wherein Als refers to metallic aluminum which is soluble in acid, namely acid-soluble aluminum.
The content of P in the steel plate is less than or equal to 0.010 percent, and can be 0.010 percent, 0.0095 percent, 0.0092 percent, 0.0090 percent, 0.008 percent, 0.007 percent, 0.006 percent or 0.005 percent, for example.
The steel sheet may have a content of S of 0.003% or less, for example, 0.003%, 0.0028%, 0.0025%, 0.002%, 0.0018%, 0.0015%, or 0.001%.
The content of N in the steel sheet is less than or equal to 0.003%, and may be, for example, 0.003%, 0.0025%, 0.0023%, 0.0021%, 0.002%, 0.0018%, 0.0015%, or 0.001%.
The content of the inevitable impurities in the present invention is not particularly limited and may be any content of impurities which may be present in the molten steel as well known to those skilled in the art, and may be, for example, 0.025%, 0.020%, 0.018%, 0.015%, or 0.010%.
The bulletproof steel plate provided by the invention has the advantages of light weight and high strength by adding a certain content of elements such as Cr, Mo, V, Als and the like and strictly controlling the proportion of the elements, and meets the requirements of weight reduction and light weight development trend in the existing vehicles, shields or helmets.
Preferably, the content of C in the steel plate is 0.27-0.30%.
Preferably, the content of Si in the steel sheet is 0.24 to 0.35%, preferably 0.27 to 0.33%.
Preferably, the content of Mn in the steel plate is 0.80-1.0%, preferably 0.85-0.95%.
Preferably, the content of Ni in the steel plate is 1.10-1.25%, preferably 1.15-1.20%.
Preferably, the content of Cr in the steel plate is 0.80-1.05%, and preferably 0.85-1.00%.
Preferably, the content of Mo in the steel plate is 0.29-0.33%, preferably 0.30-0.32%.
Preferably, the content of V in the steel plate is 0.088-0.1%, preferably 0.090-0.098%.
Preferably, the content of Als in the steel plate is 0.03-0.05%, and preferably 0.035-0.045%.
Preferably, the content of P in the steel sheet is less than or equal to 0.009%, preferably less than or equal to 0.008%.
Preferably, the content of S in the steel plate is less than or equal to 0.0025 percent, and preferably less than or equal to 0.002 percent.
Preferably, the content of N in the steel plate is less than or equal to 0.0025 percent, and preferably less than or equal to 0.002 percent.
Preferably, the unavoidable impurities are present in an amount of 0.025% or less, preferably 0.02% or less.
Preferably, the steel plate comprises the following components in percentage by mass: c: 0.27 to 0.30%, Si: 0.27 to 0.33%, Mn: 0.85-0.95%, Ni: 1.15-1.20%, Cr: 0.85-1.00%, Mo: 0.30-0.32%, V: 0.090-0.098%, Als: 0.035 to 0.045 percent, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.002 percent of N, less than or equal to 0.02 percent of unavoidable impurity content, and the balance of Fe.
The bulletproof steel plate preferably comprises the components in percentage by mass, and the bullet-proof steel plate with higher strength and better performance can be obtained by further optimizing the mixture ratio of the components.
Preferably, the thickness of the steel plate is 2-3 mm, for example, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3 mm.
The thickness of the steel plate provided by the invention is only 2-3 mm, and the requirement of light weight of the steel plate is well met.
Preferably, the steel sheet has a tensile strength > 1500MPa, which may be, for example, 1510MPa, 1550MPa, 1580MPa, 1600MPa, 1700MPa, 1800MPa, 1900MPa or 2000MPa, preferably > 1600 MPa.
The tensile strength of the bulletproof steel plate provided by the invention is more than 1500MPa, the strength is high, and the requirements of bulletproof and explosion prevention can be well met.
Preferably, the steel sheet has a yield strength > 1300MPa, for example 1310MPa, 1340MPa, 1350MPa, 1360MPa, 1400MPa, 1450MPa, 1500MPa, 1600MPa, 1700MPa, 1800MPa, 1900MPa or 2000MPa, preferably > 1400 MPa.
The steel plate provided by the invention has the yield strength of more than 1300MPa and high strength, and can be well applied to bulletproof and explosion-proof occasions.
Preferably, the steel sheet has an elongation of > 8%, for example 8.1%, 8.5%, 8.6%, 8.8%, 9.0%, 9.2%, 9.4%, 9.5%, 9.9%, 10%, 10.5%, 11%, 12%, 13%, 14%, 15%, 16%, 18%, 20% or 25%, preferably > 10%.
The steel plate provided by the invention has the elongation of more than 8%, has certain plasticity, and can prolong the service life of the steel plate.
The steel sheet preferably has a Vickers hardness of 440HV or more, for example, 440HV, 450HV, 460HV, 480HV, 490HV, 500HV, 550HV, 570HV, 600HV, 650HV, 700HV, 750HV or 800HV, preferably 500HV or more.
The steel plate provided by the invention has the Vickers hardness of more than or equal to 440HV, is high in hardness, can prevent other hard objects from penetrating through the steel plate, and can play a good role in bulletproof and explosion-proof.
In a second aspect, the present invention provides a method for producing a bulletproof steel sheet according to the first aspect, the method comprising the steps of:
(1) smelting raw material components into molten steel, and carrying out ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank, and performing high-pressure water descaling, controlled rolling, controlled cooling and coiling processes to obtain a hot-rolled coil;
(3) and carrying out heat treatment on the hot-rolled coil to obtain the steel plate.
According to the preparation method of the bulletproof steel plate, the effects of precipitation strengthening and grain refining of the added alloy elements can be exerted to the greatest extent through high-pressure water descaling, rolling control, cooling control, coiling procedures and the like, so that low deformation resistance and high strength of the steel plate during rolling are ensured, and meanwhile, the bulletproof steel plate has good forming performance.
Preferably, the molten steel is further subjected to molten steel desulfurization and converter smelting operations before ladle refining in step (1).
The invention has no special limitation on the molten steel desulfurization, converter smelting, ladle refining, RH vacuum circulation degassing refining (vacuum refining equipment and method which are jointly designed by Rheinstahl company and Heraeus company in Germany, also called vacuum circulation degassing method) and continuous casting process and equipment in the step (1), and can adopt any process and equipment which can achieve the purpose of preparing slabs and are well known by the technical personnel in the field.
Preferably, the slab is heated in the step (2) at a temperature of 1220 to 1260 ℃, for example, 1220 ℃, 1225 ℃, 1230 ℃, 1235 ℃, 1240 ℃, 1245 ℃, 1250 ℃, 1255 ℃ or 1260 ℃, preferably 1230 to 1250 ℃.
Preferably, the pressure of the high-pressure water in the high-pressure water descaling is 18 to 22MPa, and may be, for example, 18MPa, 18.5MPa, 19MPa, 19.2MPa, 19.5MPa, 19.8MPa, 20MPa, 20.2MPa, 20.5MPa, 20.8MPa, 21MPa, 21.2MPa, 21.5MPa, 21.8MPa or 22MPa, and is preferably 19 to 21 MPa.
Preferably, the controlled rolling comprises the procedures of rough rolling, hot coil box coiling and finish rolling in sequence.
Preferably, the rough rolling comprises 4 to 6 rolling processes, for example, 4, 5 or 6 rolling processes, preferably 5 rolling processes.
Preferably, the outlet temperature of the slab after rough rolling is 1120-1160 ℃, for example 1120 ℃, 1125 ℃, 1130 ℃, 1135 ℃, 1140 ℃, 1145 ℃, 1150 ℃, 1155 ℃ or 1160 ℃, preferably 1130-1150 ℃.
The invention strictly controls the outlet temperature after rough rolling, thereby controlling the precipitation strengthening and grain refining effects of alloy elements and leading the strength and the deformation resistance of the prepared steel plate to be higher.
Preferably, the finish rolling comprises 6 to 8 rolling steps, for example, 6, 7 or 8 rolling steps may be performed, and 7 rolling steps are preferred.
Preferably, the inlet temperature of the slab in the finish rolling is 1040 to 1080 ℃, and may be 1040 ℃, 1045 ℃, 1050 ℃, 1055 ℃, 1060 ℃, 1065 ℃, 1070 ℃, 1075 ℃ or 1080 ℃, and is preferably 1050 to 1070 ℃.
Preferably, the outlet temperature of the slab in the finish rolling is 880 to 920 ℃, for example 880 ℃, 885 ℃, 890 ℃, 895 ℃, 900 ℃, 905 ℃, 910 ℃, 915 ℃ or 920 ℃, preferably 890 to 910 ℃.
The invention can better exert the effects of precipitation strengthening and grain refining of the added alloy elements by controlling the inlet temperature and the outlet temperature of the plate blank in finish rolling so as to ensure low deformation resistance and high strength of the steel plate during rolling and simultaneously ensure that the steel plate has good forming performance.
Preferably, the laminar cooling speed of the controlled rolling cooling is 25-30 ℃/s, for example, 25 ℃/s, 25.5 ℃/s, 26 ℃/s, 26.5 ℃/s, 27 ℃/s, 27.5 ℃/s, 28 ℃/s, 28.5 ℃/s, 29 ℃/s, 29.5 ℃/s or 30 ℃/s, preferably 27-29 ℃/s.
The winding temperature is preferably 630 to 670 ℃, and may be, for example, 630 ℃, 635 ℃, 640 ℃, 645 ℃, 650 ℃, 655 ℃, 660 ℃, 665 ℃ or 670 ℃, preferably 640 to 660 ℃.
Preferably, the hot rolled coil is cut to obtain a cut plate.
Preferably, the heat treatment in step (3) includes heating, quenching and tempering processes in this order.
Preferably, the tempering step further includes an air cooling step.
Preferably, the heating temperature is 900-920 ℃, for example 900 ℃, 902 ℃, 905 ℃, 908 ℃, 910 ℃, 912 ℃, 915 ℃, 916 ℃, 918 ℃ or 920 ℃, preferably 910-920 ℃.
The heating method is not limited in the present invention, and any method known to those skilled in the art that can be used for heating, such as electric heating, etc., can be used.
Preferably, the temperature is kept at the heating temperature for 29-31 min, such as 29min, 29.5min, 30min, 30.5min or 31 min.
The quenching method is not limited in the present invention, and any method known to those skilled in the art that can be used for quenching can be used, and for example, the quenching method can be water quenching or oil quenching.
Preferably, the quenching is water quenching.
Preferably, the final temperature of the quenching is room temperature.
Preferably, the final heating temperature of the tempering is 190 to 210 ℃, and may be 190 ℃, 192 ℃, 195 ℃, 198 ℃, 200 ℃, 202 ℃, 205 ℃, 208 ℃ or 210 ℃, preferably 195 to 205 ℃.
The invention controls the tempering temperature to make the steel plate obtain a martensite structure with higher strength, thereby improving the strength and the deformation resistance of the final steel plate.
Preferably, the temperature is maintained at the heating final temperature of tempering for 115-125 min, such as 115min, 116min, 117min, 118min, 119min or 120min, preferably 118-123 min.
Preferably, the final temperature of the air cooling is room temperature.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) smelting raw material components into molten steel, and performing molten steel desulphurization, converter smelting, ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank to 1220-1260 ℃, descaling the plate blank by using high-pressure water of 18-22 MPa, roughly rolling for 5 times, and then rolling at an outlet temperature of 1120-1160 ℃, coiling the plate blank by using a hot rolling box, finely rolling by using 7 rolling mills, wherein the inlet temperature of the finely rolled plate is 1040-1080 ℃, the outlet temperature of the finely rolled plate is 880-920 ℃, after the finely rolled plate is subjected to controlled rolling cooling at a laminar cooling speed of 25-30 ℃/s, coiling the plate blank at 630-670 ℃ to obtain a hot rolled coil, and cutting the hot rolled coil to obtain an uncoiled plate;
(3) and heating the open flat plate to 900-920 ℃, preserving heat for 29-31 min, quenching to room temperature, heating to 190-210 ℃, preserving heat for 115-125 min, tempering, and finally air cooling to room temperature to obtain the steel plate with the martensite structure.
In a third aspect, the invention provides the use of a ballistic resistant steel sheet according to the first aspect in a vehicle, a counter, furniture, a range device, a helmet or a shield, preferably in a side panel for a ballistic resistant vehicle.
The bulletproof steel plate has the advantages of high strength, light weight and thinness, can play a good bulletproof and explosion-proof role, can reduce the burden and has a relatively high application prospect when being applied to the fields of vehicles, counters, furniture, target range equipment, helmets or shields.
The bulletproof steel plate is particularly suitable for the side carriage plate for the bulletproof vehicle, and the steel plate with high strength and light and thin specification is more required for the side carriage plate for the bulletproof vehicle because the prior bulletproof vehicle such as a cash truck, a police vehicle and the like is biased to reduce weight and light weight.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the bulletproof steel plate provided by the invention has the advantages of high strength, light weight, thin specification and the like by matching different element components, wherein the yield strength of the steel plate is more than 1300MPa, the tensile strength is more than 1500MPa, the Vickers hardness is more than or equal to 440HV, the elongation is more than 8%, and the thickness is 2-3 mm;
(2) the bulletproof steel plate provided by the invention can provide light, thin, high-strength and bulletproof steel materials for bulletproof vehicles, counters, furniture, target range equipment, helmets or shields, and meets the requirements of weight reduction, flexibility and bulletproof property;
(3) the preparation method of the bulletproof steel plate provided by the invention can exert the effects of precipitation strengthening and grain refining of the added alloy elements to the maximum extent by ensuring the control of the rolling, the cooling and the temperature in the heat treatment, so as to ensure the low deformation resistance and the high strength of the product during rolling and simultaneously have good forming performance.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
First, an embodiment
Example 1
The embodiment provides a bulletproof steel plate, which comprises the following components in percentage by mass: c: 0.26%, Si: 0.20%, Mn: 0.75%, P: 0.009%, S: 0.003%, Ni: 1.05%, Cr: 0.75%, Mo: 0.25%, V: 0.085%, Als: 0.020%, N: 0.0020 percent, and the balance of Fe and inevitable impurity elements.
The preparation method of the bulletproof steel plate provided by the embodiment comprises the following steps:
(1) smelting raw material components into molten steel, and performing molten steel desulphurization, converter smelting, ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank to 1220 ℃, descaling the plate blank by using high-pressure water of 18MPa, carrying out rough rolling for 5 times, wherein the outlet temperature is 1120 ℃, rolling the plate blank by using a hot rolling box, then carrying out finish rolling, rolling by using 7 rolling mills, wherein the inlet temperature of the finish rolling is 1040 ℃, the outlet temperature of the finish rolling is 880 ℃, carrying out controlled rolling cooling at a laminar cooling speed of 25 ℃/s after the finish rolling, coiling the plate blank at 630 ℃ to obtain a hot rolled coil, and cutting the hot rolled coil to obtain a flat plate;
(3) and heating the open flat plate to 900 ℃, preserving heat for 29min, quenching to room temperature, heating to 190 ℃, preserving heat for 115min, tempering, and finally air-cooling to room temperature of 25 ℃ to obtain the steel plate with the martensite structure.
Example 2
The embodiment provides a bulletproof steel plate, which comprises the following components in percentage by mass: c: 0.31%, Si: 0.40%, Mn: 1.10%, P: 0.010%, S: 0.003%, Ni: 1.30%, Cr: 1.10%, Mo: 0.45%, V: 0.105%, Als: 0.060%, N: 0.0030% and the balance of Fe and inevitable impurity elements.
The preparation method of the bulletproof steel plate provided by the embodiment comprises the following steps:
(1) smelting raw material components into molten steel, and performing molten steel desulphurization, converter smelting, ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank to 1260 ℃, descaling by using high-pressure water at 18MPa, roughly rolling for 5 times at an outlet temperature of 1160 ℃, coiling by using a hot rolling box, finely rolling by using a 7-frame rolling mill, wherein the inlet temperature of the fine rolling is 1080 ℃ and the outlet temperature of the fine rolling is 920 ℃, finely rolling, performing controlled rolling cooling at a laminar cooling speed of 30 ℃/s, coiling at 670 ℃ to obtain a hot-rolled coil, and cutting the hot-rolled coil to obtain a flat plate;
(3) and heating the open flat plate to 920 ℃, preserving heat for 31min, quenching to room temperature, heating to 210 ℃, preserving heat for 125min, tempering, and finally air-cooling to room temperature of 28 ℃ to obtain the steel plate with the martensite structure.
Example 3
The embodiment provides a bulletproof steel plate, which comprises the following components in percentage by mass: c: 0.30%, Si: 0.30%, Mn: 0.90%, P: 0.008%, S: 0.002%, Ni: 1.20%, Cr: 0.95%, Mo: 0.30%, V: 0.095%, Als: 0.040%, N: 0.002%, and the balance of Fe and inevitable impurity elements.
The preparation method of the bulletproof steel plate provided by the embodiment comprises the following steps:
(1) smelting raw material components into molten steel, and performing molten steel desulphurization, converter smelting, ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank to 1242 ℃, descaling the plate blank by using high-pressure water at 18MPa, carrying out rough rolling for 5 times, then carrying out rough rolling, wherein the outlet temperature is 1144 ℃, rolling the plate blank by using a hot rolling box, then carrying out finish rolling, rolling the plate blank by using 7 rolling mills, wherein the inlet temperature of the finish rolling is 1063 ℃, the outlet temperature of the finish rolling is 914 ℃, carrying out controlled rolling cooling at the laminar cooling speed of 28 ℃/s after the finish rolling, coiling the plate blank at 642 ℃ to obtain a hot rolled coil, and cutting the hot rolled coil to obtain a flat plate;
(3) and heating the open flat plate to 912 ℃, preserving heat for 30min, quenching to room temperature, heating to 203 ℃, preserving heat for 121min, tempering, and finally air-cooling to room temperature of 29 ℃ to obtain the steel plate with the martensite structure.
Example 4
This example provides a bulletproof steel sheet, which is the same as example 1 except that the mass percentage of Mo is replaced from 0.25% to 0.45%, and the balance is Fe and inevitable impurity elements, and the preparation method is the same as example 1.
Example 5
This example provides a bulletproof steel sheet, which is the same as example 1 except that the mass percentage of Mo is replaced from 0.25% to 0.29%, and the balance is Fe and inevitable impurity elements, and the preparation method is the same as example 1.
Example 6
This example provides a bulletproof steel sheet, which is the same as example 1 except that the mass percentage of Mo is replaced from 0.25% to 0.33%, and the balance is Fe and inevitable impurity elements, and the preparation method is the same as example 1.
Example 7
This example provides a ballistic resistant steel sheet having the same composition content by mass percent as in example 1.
The preparation method of the bulletproof steel plate provided by this embodiment is the same as that of embodiment 1 except that "heating to 190 ℃ for heat preservation and tempering" in step (3) is replaced by "heating to 195 ℃ for heat preservation and tempering".
Example 8
This example provides a ballistic resistant steel sheet having the same composition content by mass percent as in example 1.
The preparation method of the bulletproof steel plate provided by this embodiment is the same as that of embodiment 1 except that "heating to 190 ℃ for heat preservation and tempering" in step (3) is replaced by "heating to 205 ℃ for heat preservation and tempering".
Second, test and results
The mechanical property test is carried out on the bulletproof steel plate provided by the embodiment, and the yield strength, the tensile strength and the elongation of the bulletproof steel plate are tested according to the test method in GB/T228.1; and (4) carrying out a hardness test according to a Vickers hardness test method in GB/T4340.1.
The results of the mechanical property tests of the above examples and comparative examples are shown in table 1.
TABLE 1
From table 1, the following points can be seen:
(1) it can be seen from the comprehensive examples 1 to 8 that the bulletproof steel plate provided by the invention is added with a certain content of elements such as Cr, Mo, V and Als, the proportion of the elements is strictly controlled, the yield strength of the steel plate is more than 1300MPa, the tensile strength is more than 1500MPa, the elongation is more than 8%, and the Vickers hardness is more than or equal to 440HV, which indicates that the bulletproof steel plate provided by the invention has the advantages of high strength, high hardness, certain plasticity and the like, and the thickness of the bulletproof steel plate is between 2.0 mm and 3.0mm, so that the bulletproof steel plate has the advantages of light weight and can well meet the requirements of light weight of the existing vehicles and;
(2) it can be seen from the above description by combining examples 1 and 4 to 6 that the mass percentages of Mo in examples 5 and 6 are 0.29% and 0.33%, respectively, and that the yield strengths of the bulletproof steel sheets in examples 5 and 6 are 1385MPa and 1360MPa, respectively, and the tensile strengths are 1615MPa and 1595MPa, respectively, as compared with the mass percentages of Mo in examples 1 and 4 of 0.25% and 0.45%, respectively, while the yield strengths of examples 1 and 4 are 1345MPa and 1355MPa, and the tensile strengths of examples 1 and 4 are 1585MPa and 1560MPa, respectively, and thus it is preferable that the mass percentage of Mo is controlled between 0.29 to 0.33% in the present invention, and a bulletproof steel sheet with higher strength and better performance can be obtained;
(3) it is understood from the comprehensive results of examples 1 and 7 to 8 that in examples 7 and 8, the tempering temperatures are controlled to 195 ℃ and 205 ℃, respectively, and the tempering temperatures are controlled to 190 ℃ as compared with example 1, the yield strengths of the bulletproof steel sheets in examples 7 and 8 are 1370MPa and 1380MPa, respectively, the tensile strengths are 1620MPa and 1615MPa, respectively, while the yield strengths and the tensile strengths in example 1 are 1345MPa and 1585MPa, respectively, and the hardness is lower than those of the bulletproof steel sheets in examples 7 and 8, respectively, thereby showing that the tempering temperatures are preferably controlled to 195 ℃ to 205 ℃, so that the steel sheet can have a martensite structure with higher strength, and the strength and the deformation resistance of the final steel sheet can be improved.
In conclusion, the bulletproof steel plate provided by the invention has the advantages of high strength, large hardness, lightness and thinness, wherein the yield strength is more than 1300MPa, the tensile strength is more than 1500MPa, the elongation is more than 8%, the Vickers hardness is more than or equal to 440HV, the thickness is between 2.0 and 3.0mm, and the requirements of light weight of the existing vehicles and the like can be well met; meanwhile, the preparation method of the bulletproof steel plate provided by the invention can exert the effects of precipitation strengthening and grain refining of the added alloy elements to the greatest extent, has good forming performance and can be popularized and applied with high value.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The bulletproof steel plate is characterized by comprising the following components in percentage by mass: c: 0.26 to 0.31%, Si: 0.20 to 0.40%, Mn: 0.75-1.10%, Ni: 1.05-1.30%, Cr: 0.75 to 1.10%, Mo: 0.25-0.45%, V: 0.085-0.105%, Als: 0.020-0.060%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, N is less than or equal to 0.003%, and the balance is Fe and inevitable impurities.
2. The steel sheet according to claim 1, wherein the steel sheet has a C content of 0.27 to 0.30%;
preferably, the content of Si in the steel plate is 0.24-0.35%, preferably 0.27-0.33%;
preferably, the content of Mn in the steel plate is 0.80-1.0%, preferably 0.85-0.95%;
preferably, the content of Ni in the steel plate is 1.10-1.25%, preferably 1.15-1.20%;
preferably, the content of Cr in the steel plate is 0.80-1.05%, preferably 0.85-1.00%;
preferably, the content of Mo in the steel plate is 0.29-0.33%, preferably 0.30-0.32%;
preferably, the content of V in the steel plate is 0.088-0.1%, preferably 0.090-0.098%;
preferably, the content of Als in the steel plate is 0.03-0.05%, and preferably 0.035-0.045%;
preferably, the content of P in the steel plate is less than or equal to 0.009%, preferably less than or equal to 0.008%;
preferably, the content of S in the steel plate is less than or equal to 0.0025 percent, preferably less than or equal to 0.002 percent;
preferably, the content of N in the steel plate is less than or equal to 0.0025 percent, preferably less than or equal to 0.002 percent;
preferably, the unavoidable impurities are present in an amount of 0.025% or less, preferably 0.02% or less.
3. The steel plate according to claim 1 or 2, characterized by comprising the following components in percentage by mass: c: 0.27 to 0.30%, Si: 0.27 to 0.33%, Mn: 0.85-0.95%, Ni: 1.15-1.20%, Cr: 0.85-1.00%, Mo: 0.30-0.32%, V: 0.090-0.098%, Als: 0.035 to 0.045 percent, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.002 percent of N, less than or equal to 0.02 percent of unavoidable impurity content, and the balance of Fe.
4. A steel sheet according to any one of claims 1 to 3, wherein the steel sheet has a thickness of 2 to 3 mm;
preferably, the steel sheet has a tensile strength > 1500MPa, preferably > 1600 MPa;
preferably, the steel sheet has a yield strength > 1300MPa, preferably > 1400 MPa;
preferably, the steel sheet has an elongation > 8%, preferably > 10%;
preferably, the steel sheet has a Vickers hardness of 440HV or more, preferably 500HV or more.
5. A method of manufacturing a ballistic resistant steel sheet according to any one of claims 1 to 4, characterized in that the method comprises the steps of:
(1) smelting raw material components into molten steel, and carrying out ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank, and performing high-pressure water descaling, controlled rolling, controlled cooling and coiling processes to obtain a hot-rolled coil;
(3) and carrying out heat treatment on the hot-rolled coil to obtain the steel plate.
6. The method according to claim 5, wherein the molten steel is further subjected to molten steel desulfurization and converter smelting operations prior to ladle refining in step (1).
7. The method according to claim 5 or 6, characterized in that the slab is heated in step (2) at a temperature of 1220 to 1260 ℃, preferably 1230 to 1250 ℃;
preferably, the pressure of the high-pressure water in the high-pressure water descaling is 18-22 MPa, and preferably 19-21 MPa;
preferably, the controlled rolling comprises the working procedures of rough rolling, hot coil box coiling and finish rolling in sequence;
preferably, the rough rolling comprises 4-6 rolling procedures, preferably 5 rolling procedures;
preferably, the outlet temperature of the slab after rough rolling is 1120-1160 ℃, and preferably 1130-1150 ℃;
preferably, the finish rolling comprises 6-8 rolling procedures, preferably 7 rolling procedures;
preferably, the inlet temperature of the plate blank in the finish rolling is 1040-1080 ℃, preferably 1050-1070 ℃;
preferably, the outlet temperature of the plate blank in the finish rolling is 880-920 ℃, and preferably 890-910 ℃;
preferably, the laminar cooling speed of the controlled rolling cooling process is 25-30 ℃/s, and preferably 27-29 ℃/s;
preferably, the coiling temperature is 630-670 ℃, preferably 640-660 ℃;
preferably, the hot rolled coil is cut to obtain a cut plate.
8. The method according to any one of claims 5 to 7, wherein the heat treatment in step (3) comprises heating, quenching and tempering processes in sequence;
preferably, the tempering process further comprises an air cooling process;
preferably, the heating temperature is 900-920 ℃, and preferably 910-920 ℃;
preferably, the temperature is kept for 29-31 min at the heating temperature;
preferably, the quenching is water quenching;
preferably, the final temperature of the quenching is room temperature;
preferably, the heating final temperature of the tempering is 190-210 ℃, and preferably 195-205 ℃;
preferably, the temperature is kept for 115-125 min, preferably 118-123 min, in the heating final temperature of tempering;
preferably, the final temperature of the air cooling is room temperature.
9. A method according to any one of claims 5 to 8, characterized in that the method comprises the steps of:
(1) smelting raw material components into molten steel, and performing molten steel desulphurization, converter smelting, ladle refining, RH vacuum circulation degassing refining and continuous casting on the molten steel to obtain a plate blank;
(2) heating the plate blank to 1220-1260 ℃, descaling the plate blank by using high-pressure water of 18-22 MPa, roughly rolling for 5 times, and then rolling at an outlet temperature of 1120-1160 ℃, coiling the plate blank by using a hot rolling box, finely rolling by using 7 rolling mills, wherein the inlet temperature of the finely rolled plate is 1040-1080 ℃, the outlet temperature of the finely rolled plate is 880-920 ℃, after the finely rolled plate is subjected to controlled rolling cooling at a laminar cooling speed of 25-30 ℃/s, coiling the plate blank at 630-670 ℃ to obtain a hot rolled coil, and cutting the hot rolled coil to obtain an uncoiled plate;
(3) and heating the open flat plate to 900-920 ℃, preserving heat for 29-31 min, quenching to room temperature, heating to 190-210 ℃, preserving heat for 115-125 min, tempering, and finally air cooling to room temperature to obtain the steel plate with the martensite structure.
10. Use of a ballistic steel sheet according to any one of claims 1 to 4 in vehicles, counters, furniture, firing ground equipment, helmets or shields, preferably in side panels for ballistic vehicles.
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| CN113215493A (en) * | 2021-05-11 | 2021-08-06 | 北京理工大学 | High-strength grenade steel and preparation method thereof |
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| CN106319347A (en) * | 2016-10-27 | 2017-01-11 | 钢铁研究总院淮安有限公司 | Silicon vanadium steel plate with promoted bulletproof performance and manufacturing method |
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| CN106319347A (en) * | 2016-10-27 | 2017-01-11 | 钢铁研究总院淮安有限公司 | Silicon vanadium steel plate with promoted bulletproof performance and manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113215493A (en) * | 2021-05-11 | 2021-08-06 | 北京理工大学 | High-strength grenade steel and preparation method thereof |
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