CN109930075B - Bulletproof steel plate for armor and manufacturing method thereof - Google Patents
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Abstract
The invention provides a bulletproof steel plate for armor and a manufacturing method thereof, and the bulletproof steel plate for armor comprises the following components in percentage by weight: 0.25 to 0.38 percent of C, 0.20 to 0.40 percent of Si, 0.22 to 0.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.010 to 0.050 percent of Alt, 0.10 to 0.38 percent of Ni, 0.80 to 1.50 percent of Cr, 0.16 to 0.40 percent of Mo, 0.010 to 0.035 percent of Ti, less than or equal to 0.0050 percent of N, and less than or equal to 0.00022 percent of H; and the balance Fe and unavoidable impurities; the method for manufacturing the steel plate comprises a steel-making process, a steel rolling process and a heat treatment process. The bulletproof steel plate for armor ensures the strength of the steel plate and improves the ductility and toughness index; the manufacturing method of the bulletproof steel plate for the armor is reasonable in design, fully exerts the advantages of each control process, ensures the uniformity of the performance of the steel plate, effectively eliminates the influence of residual internal stress of the steel plate, and improves the subsequent processing performances of the steel plate such as cutting, welding and the like.
Description
Technical Field
The invention relates to the technical field of high-strength quenched and tempered steel and a production process thereof, in particular to a bulletproof steel plate for an armor and a manufacturing method thereof, wherein the Brinell hardness of the bulletproof steel plate for the armor is in the range of 480HBW-530 HBW.
Background
Armor protection is the basis for tank armored vehicles to survive in a battlefield. In modern war, tank armored vehicles face all-round three-dimensional attacks of various anti-armor weapons such as enemy tank guns, anti-tank missiles, shoulder-carried anti-tank weapons, anti-tanke grenades, simple explosion devices, electromagnetic weapons and high-power microwave weapons, and have higher requirements on the protective capability of the tank armored vehicles. Therefore, strengthening armor protection has become a hot spot in various countries.
The main function of the bulletproof steel plate is to prevent penetration of bullets into the steel plate, which requires that the steel plate has high strength and hardness and good impact toughness. The strength and hardness of the steel plate are improved, the energy required by the bullets to penetrate the steel plate is increased, and after the hardness reaches a certain degree, the bullets are broken when impacting the steel plate at high speed, so that the bulletproof function is achieved. However, the hardness of the steel plate is not as high as possible, and the toughness of the steel plate is significantly reduced with the increase of hardness and strength, so that the steel plate is brittle, and the penetration resistance of the steel plate is reduced. Therefore, the bulletproof steel plate needs to have good ductility and toughness and welding performance while ensuring high strength and high hardness.
Through search, the following patent applications relate to a bulletproof steel sheet for armor and a manufacturing method thereof, and chemical components, process systems and mechanical properties thereof are shown in table 1.
Table 1 details of bullet-proof steels for armor to which the prior patent application relates
CN1814845A discloses a 1000 MPa-grade high-strength hot-rolled bulletproof steel plate and a manufacturing method thereof, wherein the carbon content is 0.17-0.21%, the alloy content is lower, the hot-rolled bulletproof steel plate does not undergo a heat treatment process, the yield strength is 545-885MPa, the elongation is 10-15%, the hot-rolled bulletproof steel plate is a hot-rolled coiled plate, and the thickness is less than 3 mm.
CN103993235A discloses a method for manufacturing a high-strength hot-rolled bulletproof steel plate, wherein the carbon content is lower than 0.08-0.12%, alloy elements such as Ti, Nb, B, Al and the like are added, quenching and tempering are needed, the yield strength is 1125-shaped and 1208MPa, the elongation is 8.5-10%, the Brinell hardness range is 478-shaped and 501HBW, the steel plate is a hot-rolled coiled plate, and the thickness is 2.0-3.0 mm.
CN102181795A discloses an ultrahigh strength bulletproof steel plate and a manufacturing process thereof, wherein the carbon content is higher than 0.3-0.5%, alloy elements such as Cr, Ni, Mo, V, Ti, B and the like are added, and after quenching treatment, the yield strength reaches more than 1350MPa due to higher carbon equivalent, the hardness value is in the range of 480 plus 630HBW according to different thicknesses, but the elongation is lower than or equal to 5%. Is a hot-rolled coil with the thickness of 2.2-3.7 mm.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a bulletproof steel plate for armor and a manufacturing method thereof, the bulletproof steel plate for armor has the thickness range of 5-10mm, the yield strength range of 1350-minus-plus 1490MPa, the tensile strength range of 1620-minus 1730MPa, the elongation (A50) range of 10-16%, the hardness value range of 480-minus-40 ℃ low-temperature impact toughness of not less than 30J, and the steel plate straightness of 2-4mm/2 m; the manufacturing method of the bulletproof steel plate for the armor is reasonable in design, fully exerts the advantages of each control process, ensures the uniformity of the performance of the steel plate, effectively eliminates the influence of residual internal stress of the steel plate, and improves the subsequent processing performances of the steel plate such as cutting, welding and the like.
The invention aims to provide a bulletproof steel plate for an armor, which has higher strength and hardness and good plasticity and toughness, and comprises the following components in percentage by weight: 0.25 to 0.38 percent of C, 0.20 to 0.40 percent of Si, 0.22 to 0.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.010 to 0.050 percent of Alt, 0.10 to 0.38 percent of Ni, 0.80 to 1.50 percent of Cr, 0.16 to 0.40 percent of Mo, 0.010 to 0.035 percent of Ti, less than or equal to 0.0050 percent of N, and less than or equal to 0.00022 percent of H; and the balance Fe and inevitable impurities.
The reason why the above components and their weight percentages are adopted in the present invention is described in detail below:
c has great influence on strength, toughness and welding performance, and is a main element for improving the strength of the steel plate; c generally serves as a strengthening component in steel, is dissolved into a matrix to play a role of solid solution strengthening, and increases the content of C can promote the formation of carbide and martensite.
Si is an essential element for deoxidation in steel making, and has a certain solid solution strengthening effect, but too high has an adverse effect on weldability and cold formability of steel.
Mn is an important strengthening and toughening element and has a great promoting effect on martensite transformation, but the Mn content is too high, the center segregation of the thick plate blank is increased, and the performance nonuniformity of the thick steel plate in the thickness aspect is reduced.
P is a strong segregation element in steel and also seriously reduces the low-temperature toughness of the steel, so the content of P in the steel is required to be reduced as much as possible.
S is a harmful impurity element in steel, and the content of S is reduced as much as possible because the S deteriorates the toughness and plasticity, cold formability and weldability of steel and causes differences in the longitudinal and transverse properties of steel sheets.
Alt is a main deoxidizing element of steel, the content of Alt is more than 0.05 percent, oxide inclusions of Alt are increased, the purity of the steel is reduced, the toughness and the weather resistance of the steel are not facilitated, the melting point of Alt is high, and austenite grains can be prevented from growing when a plate blank is heated.
Ni is a strong carbonitride forming element, can effectively delay the recrystallization of deformed austenite, prevent austenite grains from growing, improve the recrystallization temperature of the austenite, refine the grains and improve the toughness of the steel.
Cr is an element that increases hardenability, suppresses the formation of polygonal ferrite and pearlite, and promotes bainite or martensite transformation, thereby increasing the strength and hardness of the steel, but too high Cr affects the toughness of the steel and causes temper brittleness.
Mo increases hardenability, increases the strength of the steel, and effectively delays ferrite and pearlite transformation, thereby promoting bainite to be obtained, so that the steel obtains a relatively complete acicular structure in a wide cooling rate range, but too high Mo significantly deteriorates low-temperature toughness of the steel, and also forms too much martensite during welding, resulting in increased brittleness of a welded joint.
Ti is a strong carbonitride forming element, and the carbonitride thereof has a high melting point and has an inhibiting effect on the growth of austenite grains upon heating. TiN or TiC particles in the steel can obviously organize the grain growth of a welding heat affected zone, thereby improving the mechanical property of a welding joint.
Ni can improve hardenability, has a certain strengthening effect, and can also obviously improve the low-temperature toughness of steel, so that the low-temperature toughness of a base material and a welding heat affected zone is greatly improved.
N, H is a harmful element and causes quality defects such as processing cracks, and therefore, a smaller content is better.
Preferably, the steel plate comprises the following components in percentage by weight: 0.28 to 0.33 percent of C, 0.29 to 0.37 percent of Si, 0.28 to 0.47 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.025 to 0.050 percent of Alt, 0.19 to 0.32 percent of Ni, 0.82 to 1.27 percent of Cr0.25 to 0.35 percent of Mo, 0.017 to 0.033 percent of Ti, less than or equal to 0.0050 percent of N and less than or equal to 0.00022 percent of H; and the balance Fe and inevitable impurities.
Preferably, the steel plate comprises the following components in percentage by weight: 0.28% of C, 0.33% of Si, 0.28% of Mn, 0.014% of P, 0.003% of S, 0.048% of Alt, 0.19% of Ni, 0.98% of Cr, 0.25% of Mo, 0.033% of Ti, 0.0044% of N and 0.00014% of H; and the balance Fe and inevitable impurities.
Preferably, the steel plate comprises the following components in percentage by weight: 0.33 percent of C, 0.29 percent of Si, 0.30 percent of Mn, 0.018 percent of P, 0.002 percent of S, 0.032 percent of Alt, 0.23 percent of Ni, 0.82 percent of Cr, 0.27 percent of Mo, 0.029 percent of Ti, 0.0028 percent of N, and 0.00013 percent of H; and the balance Fe and inevitable impurities.
The second object of the present invention is to provide a method for manufacturing the bulletproof steel sheet for armor, which includes a steel-making process, a steel-rolling process, and a heat treatment process.
The manufacturing method of the bulletproof steel plate for the armor comprises the following specific production process flows: molten iron pretreatment → converter smelting → LF/RH refining → continuous casting → casting blank slow cooling → slab heating → rolling → cooling → shot blasting → quenching → low temperature tempering → inspection, inspection → identification → warehousing.
In the steelmaking process of the manufacturing method of the bulletproof steel plate for armor, molten iron is subjected to desulfurization pretreatment and smelted by a top-bottom combined blown converter; in the LF and RH combined refining process, LF molten steel is discharged (S)]Not more than 0.0050 percent, RH vacuum degree below 100Pa, treatment time not less than 10min, RH outbound molten steel [ H]Less than or equal to 0.0002 percent; the continuous casting tundish adopts an alkaline covering agent, and the alkaline covering agent comprises the following components in percentage by weight: graphite: 6-18%, fluorite: 6-10 percent of CaO, 19-52 percent of SiO2≤6％、Al2O321-26 percent of the tundish covering agent, less than or equal to 8 percent of MgO, less than or equal to 0.5 percent of water and 1.0-1.5 percent of (CaO + MgO)/SiO2, wherein the tundish covering agent does not crust in the using process, has proper melting point and spreadability and excellent heat preservation, can prevent the temperature of the molten steel of the tundish from being reduced too much and avoid the formation of slag crust on the surface of the molten steel; the crystallizer adopts low-carbon microalloy covering slag, the steel ladle is covered, a steel ladle protective sleeve and a steel ladle immersion nozzle are adopted for protection pouring in the whole process, and the increase of N in the continuous casting process is controlled to be not more than 0.0003 percent; in order to improve the macrostructure of the casting blank and reduce the residual hydrogen amount of the casting blank, the casting blank cut by the continuous casting machine enters a slow cooling pit for slow cooling, the temperature of the casting blank entering the pit is 500-900 ℃, the slow cooling time is 48-52h, the temperature of the casting pit is less than or equal to 250 ℃, and the center segregation C of the macrostructure of the casting blank exiting the pit is less than or equal to 1.5.
In the steel rolling process of the manufacturing method of the bulletproof steel plate for the armor, in order to ensure the sufficient solid solution of alloy elements and prevent austenite grains from excessively growing, the heating temperature of a casting blank is controlled between 1200 and 1250 ℃; two-stage rolling is adopted, the initial rolling temperature range of rough rolling is 1050-; the second stage (finish rolling) is rolling within the austenite non-recrystallization temperature range, the start temperature of the finish rolling is less than or equal to 920 ℃, and the finish rolling temperature is 800-.
In the heat treatment process of the manufacturing method of the bulletproof steel plate for the armor, in the first stage, the steel plate is heated in a nitrogen protection roller-hearth heat treatment furnace to be completely austenitized, the quenching temperature is in the range of 870-: the thickness of the steel plate is multiplied by 1.5+ 10-the thickness of the steel plate is multiplied by 2.5+ 15; then rapidly cooling to room temperature in a rolling type quenching machine, wherein the cooling speed is not lower than 50 ℃/S; in the second stage, the steel plate is heated to the temperature of 220-280 ℃, and the heat preservation time (min) is as follows: the thickness of the steel plate is multiplied by 3-the thickness of the steel plate is multiplied by 5, wherein the thickness of the steel plate is the thickness of the final steel plate of the product, and the unit is mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the alloy component proportion in a specific range, and improves the ductility and toughness index while ensuring the strength of the steel plate.
2. The invention adopts a clean steel smelting continuous casting process technology, fully exerts the functions of various metallurgical equipment such as molten iron pretreatment, a top-bottom combined blown converter, LF/RH, a tundish and the like, controls the content of harmful impurities such as S, H, N and the like in the whole process, and slowly cools the casting blank by using a slow cooling pit, wherein the macrostructure center segregation C class of the casting blank discharged from the pit is less than or equal to 1.5.
3. The invention adopts quenching and low-temperature tempering heat treatment process, so that the performance uniformity of the steel plate is effectively ensured, the influence of residual internal stress of the steel plate can be effectively eliminated, and the subsequent processing performances of the steel plate such as cutting, welding and the like are improved.
4. The component system, the thickness range of the product, the heat treatment process and the form of the finished steel plate are different from those of the prior art, the process provided by the invention ensures that the finished armor bulletproof steel plate has the advantages of uniform performance and the like, fully considers the influence of impact toughness on the penetration resistance of the steel plate, and has excellent bulletproof function. The detection result of the bulletproof steel plate for armor is as follows: the thickness range is 5-10mm, the yield strength range is 1350-1490MPa, the tensile strength range is 1620-1730MPa, the elongation (A50) range is 10-16%, the hardness range is 480-530HBW, the-40 ℃ low-temperature impact toughness is more than or equal to 30J, and the steel plate flatness meets 2-4mm/2 m.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a 500-fold metallographic structure diagram of a bulletproof steel plate for 6mm armor described in embodiment 1 of the present invention at a thickness of 1/2.
Fig. 2 is a 500-fold metallographic structure diagram of a bulletproof steel sheet for 10mm armor, which is described in embodiment 2 of the present invention, at a thickness of 1/2.
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 with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention was carried out in a 210 ton converter in a steel plant and 4300mm in a wide and thick plate plant.
The embodiments of examples 1-4 are as follows:
the component system adopted in the embodiments 1 to 4 comprises the following components in percentage by weight: 0.25 to 0.38 percent of C, 0.20 to 0.40 percent of Si, 0.22 to 0.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.010 to 0.050 percent of Alt, 0.10 to 0.38 percent of Ni0.80 to 1.50 percent of Cr, 0.16 to 0.40 percent of Mo, 0.010 to 0.035 percent of Ti, less than or equal to 0.0050 percent of N, and less than or equal to 0.00022 percent of H; and the balance Fe and inevitable impurities, the specific composition of which is shown in Table 2,
TABLE 2 melting composition in wt.%
The bulletproof steel plate for armor is manufactured by adopting the following process:
molten iron pretreatment → converter smelting → LF/RH refining → continuous casting → casting blank slow cooling → slab heating → rolling → cooling → inspection, inspection → warehousing.
The steel-making process comprises the following steps: adopts a clean steel smelting continuous casting process. The molten iron is subjected to desulfurization pretreatment and smelting by a top-bottom combined blown converter; LF molten steel delivery [ S ]]Not more than 0.0050 percent, RH vacuum degree below 100Pa, treatment time not less than 10min, RH outbound molten steel [ H]Less than or equal to 0.0002 percent; the continuous casting tundish adopts an alkaline covering agent, and the covering agent of the tundish comprises the following components in percentage by weight: graphite: 6-18%, fluorite: 8 percent, CaO 30 percent and SiO26％,Al2O324%, MgO 8%, water 0.5%, (CaO + MgO)/SiO2Is 1.3; the tundish covering agent is not encrusted in the using process, has proper melting point and spreadability and excellent heat preservation, can prevent the temperature of molten steel in a tundish from being reduced too much, and avoids the formation of slag shells on the surface of the molten steel; the crystallizer adopts low-carbon microalloy covering slag, the steel ladle is covered, a steel ladle protective sleeve and a steel ladle immersion nozzle are adopted for protection pouring in the whole process, and the increase of N in the continuous casting process is controlled to be not more than 0.0003 percent; in order to improve the macrostructure of a casting blank and reduce the residual hydrogen amount of the casting blank, the casting blank cut by a continuous casting machine is put into a slow cooling pit for slow cooling, the temperature of the casting blank put into the pit is 500-900 ℃, the slow cooling time is 48-52h, the temperature of the cast blank taken out of the pit is less than or equal to 250 ℃, and the center segregation C of the macrostructure of the casting blank taken out of the pit is less than or equal to 1.; the specific steel-making technological parameters are shown in the table 3,
TABLE 3 steelmaking Process parameters
In order to ensure the sufficient solid solution of alloy elements and prevent austenite grains from excessively growing, the heating temperature of a casting blank is controlled between 1200 ℃ and 1250 ℃ in the steel rolling process; two-stage rolling is adopted, the initial rolling temperature range of rough rolling is 1050-; the second stage (finish rolling) is rolling within the austenite non-recrystallization temperature range, the start rolling temperature of the finish rolling is less than or equal to 920 ℃, the finish rolling temperature is 800-,
TABLE 4 Steel Rolling Process parameters
In the heat treatment process of the manufacturing method of the bulletproof steel plate for the armor, a tempered martensite structure is obtained after heat treatment; the heat treatment process is divided into two stages, wherein in the first stage, the steel plate is heated in a nitrogen protection roller bottom type heat treatment furnace to be completely austenitized, the quenching temperature is in the range of 870-920 ℃, and the heat preservation time is as follows: steel plate thickness (mm) × 1.5+ 10-steel plate thickness (mm) × 2.5+ 15; then rapidly cooling to room temperature in a rolling type quenching machine, wherein the cooling speed is not lower than 50 ℃/S; in the second stage, the steel plate is heated to the temperature of 220 ℃ and 280 ℃, and the heat preservation time is as follows: the thickness of the steel plate is multiplied by 3-the thickness of the steel plate is multiplied by 5, wherein, the thickness of the steel plate is the final thickness of the steel plate of the product, the unit is mm, the parameters of the heat treatment process are shown in the table 5,
TABLE 5 Heat treatment Process parameters
Example 5
Example 5 differs from example 1 in that the weight percentage of Cr is 0.7% and the remaining components are the same as in example 5, and then steel sheets were produced using the steel sheet production method and process parameters provided in example 5.
Example 6
Example 6 differs from example 1 in that the percentage of the remaining components was the same as in example 5 except that the component Co was removed, and then a steel sheet was prepared using the steel sheet preparation method and process parameters provided in example 5.
The armor plates obtained in examples 1-6 were tested and the results are shown in table 6, as follows:
TABLE 6 test results of the Steel plates in substance
Although the present invention has been described in detail by referring to the 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 (4)
1. A bulletproof steel plate for armor is characterized by comprising the following components in percentage by weight: 0.25 to 0.38 percent of C, 0.20 to 0.40 percent of Si, 0.22 to 0.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.010 to 0.050 percent of Alt, 0.10 to 0.38 percent of Ni, 0.80 to 1.50 percent of Cr, 0.16 to 0.40 percent of Mo, 0.010 to 0.035 percent of Ti, less than or equal to 0.0050 percent of N, and less than or equal to 0.00022 percent of H; and the balance Fe and unavoidable impurities;
the manufacturing method of the bulletproof steel plate for the armor comprises a steel-making process, a steel rolling process and a heat treatment process;
the specific production process flow of the manufacturing method is as follows: molten iron pretreatment → converter smelting → LF/RH refining → continuous casting → casting blank slow cooling → slab heating → rolling → cooling → shot blasting → quenching → low-temperature tempering → inspection, inspection → identification → warehousing;
in the steelmaking process, molten iron is subjected to desulfurization pretreatment and smelting in a top-bottom combined blown converter; in the LF and RH combined refining process, the outbound S of LF molten steel is less than or equal to 0.0050 percent, the treatment time of RH vacuum degree below 100Pa is more than or equal to 10min, and the RH outbound molten steel is less than or equal to 0.0002 percent; the continuous casting tundish adopts an alkaline covering agent, the crystallizer adopts low-carbon microalloy covering slag, the ladle capping, the ladle protective sleeve and the tundish submerged nozzle are adopted to protect the casting in the whole process, and the increase of N in the continuous casting process is controlled to be not more than 0.0003 percent; the casting blank cut by the continuous casting machine is put into a slow cooling pit for slow cooling, the temperature of the casting blank in the pit is 500-900 ℃, the slow cooling time is 48-52h, the temperature of the casting blank out of the pit is less than or equal to 250 ℃, and the center segregation C of the macrostructure of the casting blank out of the pit is less than or equal to 1.5;
in the steel rolling process, the heating temperature of the casting blank is controlled between 1200-1250 ℃; two-stage rolling is adopted, the initial rolling temperature range of rough rolling is 1050-; the second stage is rolling in the austenite non-recrystallization temperature range, the rolling temperature of finish rolling is less than or equal to 920 ℃, and the finishing temperature is 800-830 ℃;
in the heat treatment process, in the first stage, the steel plate is heated in a nitrogen protection roller hearth type heat treatment furnace to be completely austenitized, the quenching temperature is in the range of 870-920 ℃, and the heat preservation time is as follows: the thickness of the steel plate is multiplied by 1.5+ 10-the thickness of the steel plate is multiplied by 2.5+ 15; then rapidly cooling to room temperature in a rolling type quenching machine, wherein the cooling speed is not lower than 50 ℃/S; in the second stage, the steel plate is heated to the temperature of 220 ℃ and 280 ℃, and the heat preservation time is as follows: the thickness of the steel plate is multiplied by 3-the thickness of the steel plate is multiplied by 5, wherein the unit of the heat preservation time is min, and the thickness of the steel plate is the thickness of the final steel plate of the product and is in mm.
2. A ballistic resistant steel sheet for armor according to claim 1 which comprises the following components in weight percent: 0.28 to 0.33 percent of C, 0.29 to 0.37 percent of Si, 0.28 to 0.47 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.025 to 0.050 percent of Alt0.025 to 0.050 percent of Ni, 0.19 to 0.32 percent of Cr, 0.82 to 1.27 percent of Mo, 0.25 to 0.35 percent of Ti, 0.017 to 0.033 percent of N, less than or equal to 0.0050 percent of H, less than or equal to 0.00022 percent of H; and the balance Fe and inevitable impurities.
3. A ballistic resistant steel sheet for armor according to claim 1 which comprises the following components in weight percent: 0.28% of C, 0.33% of Si, 0.28% of Mn, 0.014% of P, 0.003% of S, 0.048% of Alt0.048% of Ni, 0.19% of Cr0.98%, 0.25% of Mo, 0.033% of Ti, 0.0044% of N and 0.00014% of H; and the balance Fe and inevitable impurities.
4. A ballistic resistant steel sheet for armor according to claim 1 which comprises the following components in weight percent: 0.33 percent of C, 0.29 percent of Si, 0.30 percent of Mn, 0.018 percent of P, 0.002 percent of S, 0.032 percent of Alt, 0.23 percent of Ni, 0.82 percent of Cr, 0.27 percent of Mo, 0.029 percent of Ti, 0.0028 percent of N, and 0.00013 percent of H; and the balance Fe and inevitable impurities.
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