High-strength armour steel and production of sheets thereof. RU patent 2520247.
 Composite material based on boron carbide / 2515663Invention relates to composite material, containing particles of diamond, boron carbide and silicon carbide, and can be applied as armour, instruments for cutting, drilling and mechanical processing, as well as in applications, where abrasive wear takes place. Composite material possesses porosity, equal to less than 2 vol. %. The average size of diamond particles is not more than 50 mcm different from the average size of boron carbide particles. Method of manufacturing such materials includes application of boron carbide coating on multitude of diamond particles, joining multitude of diamond particles with formation of raw material and heating raw material in contact with silicon melt to the temperature in the range from approximately 1200 to approximately 2000°C under impact of pressure or vacuum, which does not exceed approximately 2000 MPa. |
 High-strength high-ductility iron-based alloys and methods of their production / 2481417Proposed alloy comprises the following components in wt %: 0.48 - 0.52 of carbon, 0.15 - 1.00 of manganese, 0.15 - 0.45 of silicon, 0.95 - 1.70 of chromium, 3.30 - 4.30 of nickel, 0.35 - 0.65 of molybdenum, 0.0008 - 0.0030 of boron, 0.001 - 0.015 of cerium, 0.001 - 0.015 of lanthanum, not over 0.002 of sulfur, not over 0.015 of phosphorus, not over 0.10 of nitrogen, iron and casual impurities making the rest. Alloy austenitising at, at least, 1500°F (815°C), hold for, at least, 30 minutes and cooling predefine its use for making armor elements. |
 Method of making steel flat products / 2481407Steel smelting is performed, steel is refined to obtain that containing the following substances in wt % 0.25-0.35 of C, 0.6-0.7 of Si, 0.6-0.9 of Mn, 0.10-0.15 of Al, 0.70-0.95 of Ni, 3.1-3.3 of Co, 0.4-0.6 of Cu, 2.9-3.3 of Cr, 0.4-0.5 of Mo, 0.1-0.2 of V, not over 0.005 of S, not over 0.005 of P, Fe making the rest, ingots are cast and casting is terminated at temperature, at least 8°C higher than liquidus temperature. Obtained ingots are heated and subjected to multipass blooming in lengthwise direction with total relative reduction of, at least, 85% for production of slab. Said slab is subjected to rolling in several steps. Note here that, in first step, slab is reduced to sheet depth 2-10 times larger than final depth and cooled by water at the rate of 400°C/min. Then, sheet is heated to, at least, 900°C and rolled to final depth at rolling end temperature of, at least, 650°C and subjected to water tempering immediately. Low-temperature tempering is performed in, at least, 8 h at 100-200°C. |
 Method to manufacture structured ceramic armour and armour produced by this method / 2461789Method consists in manufacturing an armour arranged in the form of a structured ceramic panel. According to the method there are cuts made in a sheet element in specified areas. Then the sheet element is exposed to continuous deformation to produce a spatial structure and is fixed in such position. Then the produced spatial structure is placed into a die mould, which is filled with ceramic mass so that it fully covers the spatial structure. Afterwards the stock is ceramised to produce the armour with the specified topology of structural heterogeneity provided by the spatial structure shape. The armour is made to form holes filled with ceramic mass in process of panel formation provided between cuts. |
 Ceramic armour element, and composite armour on its basis / 2459174Ceramic armour element is made in the form of a regular hexagonal prism the side edges of which have concave shape relative to vertical axis. Composite armour contains crushing-diverting layer consisting of separate ceramic elements combined into a single panel by means of a binding agent on the basis of polymers, and arresting layer made from aluminium alloy, steel or other strong material. Crushing-diverting and arresting layers are arranged with a gap of the specified size or between crushing-diverting and arresting layers there arranged is material layer with modulus of elasticity in compression of less than 40 GPa. Separate ceramic elements are made in the form of regular hexagonal prisms, and lateral edges of prisms form a gap between lateral edges of neighbouring elements. |
 Tank armour protection / 2397429Armour protection comprises enclosure, made of fore, side and stern plates connected by welding, and cast turret, which external surface is made of flat multangulars forming prominent spatial polyhedron. On flat polyhedrons of enclosure and turret surface, prominent stems are installed. Each stem is installed with its flat base on elastic shock-absorber and fixed on the axis, perpendicular to polyhedron surface of enclosure or turret, with the possibility of turning and translational displacement along the axis upon shock-absorber deformation. In addition extra fixed prominent stems are installed on flat polyhedrons of enclosure and turret surface. |
| Welded bullet-proof armour steel / 2392347 Steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, niobium, copper, sulphur, phosphor and iron, at following component ratio, wt %: carbon 0.38-0.43, silicon 0.50-0.80, manganese 0.30-0.50, chromium 1.20-1.50, nickel 0.90-1.20, molybdenum 0.75-0.85, vanadium 0.18-0.28, niobium 0.02-0.05, copper ≤ 0.30, sulphur ≤ 0.01, phosphor ≤ 0.01, the rest is iron. |
 Protective armour for protection against bombardment, as well as manufacturing method thereof / 2381284Group of inventions refers to protective armour for protection against bombardment. Such armour includes screen (1) made from case-hardening steel containing Si, Cu and Mo or Mn with base carbon content of less than 0.3 wt % and enriched with carbon for hardness increase in boundary zone or zones (R) located as to depth of screen from at least one external surface (D1) of screen (1) by means of chemical heat treatment in the form of carbonisation or carbonitriding and further heat treatment. Treatment has been performed so that boundary zone (R) is enriched with carbon at least up to 0.5 wt % so that carbides are formed on external surface and minimum hardness 55 HRC is provided on it. At that, screen (1) has zone (B) non-enriched or low-enriched with carbon, and boundary zone (R) passes to the above zone with carbon content decrease. Steel in boundary zone (R) enriched with carbon and in zone (B) non-enriched or low-enriched with carbon with comparatively low hardness contains silica max. 0.4 wt %. There also proposed is method for producing protective armour and use of screen (1) for protection against bombardment. |
 Transparent ceramic composition / 2359832Invention is related to transparent bullet protection against bullets of ultrahigh hardness. Transparent ceramic composition includes external layer from at least one plate of single-crystal sapphire, intermediate layer from at least single glass plate and internal layer from polycarbonate plate. External layer from sapphire is covered with plate of silicate glass. |
| Armoured steel and steel armoured detail / 2353697 Invention relates to ferrous metallurgy and armor protection and can be used for manufacturing of personal protection equipment and also for armor protection of cars, special carriages and other lightly armoured machinery. Steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, sulfur, phosphor, niobium, copper and iron, at following ratio of components , wt %: carbon 0.47 - 0.52, silicon 0.50 - 0.80, manganese 0.30 - 0.50, chromium 1.20 - 1.50, nickel 0.90 - 1.20, molybdenum 0.75 - 0.85, vanadium 0.18 - 0.28, niobium 0.02 - 0.05, copper ≤ 0.30, sulfur ≤ 0.01, phosphor ≤ 0.01, iron is the rest. |
| Bulletproof vest armour / 2519501 Invention relates to production of coatings that are resistant to bullet shooting impact in the course of operation and may be used for increase of the vest bulletproof performance. The bulletproof vest armour includes a layered coating on steel plates, the layered coating representing alternation of 3 nickel layers, 7-10 mcm thick, applied by the method of ion bombardment condensation, with 3 layers of chrome carbide layers,145-150 mcm thick, applied by the plasma cluster method. |
 Passive jam ejector / 2517549Proposed device comprises box-like case rigidly secured at aircraft airframe to carry electronic module for generation of jam cartridge actuating pulses and replaceable cassette fasteners, device to transmit said jam cartridge actuating pulses and jam cartridge device guides. Note here that the base of said base has the assemblies of fasting of said case to aircraft and assemblies of replaceable contact modules. Protective controlled flaps are arranged at the case outer surface. Linear electric drives are mounted at the case sidewalls to open said flaps before ejection of jam cartridges and to close than after ejection. Jam cartridge guides are composed by a set of replaceable cassettes including seats of jam cartridges of various design and purpose. Said device to transmit said jam cartridge actuating pulses is composed of the set of assemblies of replaceable contact modules with contact assemblies. The latter comprises three spring-loaded contacts to allow the electric contact with appropriate jam cartridge. Note here that the number and location of contact assembly in replaceable contact module complies with those of jam cartridge in replaceable cassette. |
| Volume-combined armour / 2517547 Volume-combined armour comprises a highly consistent layer from tightly packed small-size axisymmetric ceramic elements, arranged at the angle in respect to the plane of the armour, connected by a binder into a monolith, and a high-strength energy-intensive rear layer, at the same time ceramic elements are made in the form of tightly adjacent polygons, axes of symmetry of which are arranged at the angle 60-89° in respect to the plane of the armour. |
 Armour element / 2516905Armour element represents a 3D body with side surface cylindrical section and bulged base. Radius of surface curvature of the latter is larger than side surface cylindrical section diameter. Note here that said armour element side surface section abutting by its base on side surface cylindrical section. The latter features conical or pyramidal shape in height larger than that of side surface cylindrical section. |
 Protective vest of cs type / 2506526Invention relates to personal protective equipment of operators against mechanical impact. The protective vest consists of a fabric lining connected to the protective shell, and in the fabric lining the elastic frame stands are secured by clips on the belt, and the protective shell is attached to the elastic frame stands, the protective shell comprises an outer and inner protective bags, between which the gasket is placed, made in the form of a tape with fixed pleats placed with a constant pitch from the side of protected object, and is sequentially placed in two outer shells, and the outer bag facing the surrounding environment of the operator, is made multi-layered, at that each layer is made in the form of interconnected rings, which material is used as stainless steel, at that the layers are located to overlap the lumen of the rings with their articulation, and the inner protective bag is made three-layered, at that the layer in contact with the outer shell and the layer facing the operator's body are made of perforated polymeric material such as aramid fiber, and the intermediate layer located between them is made elastic from resilient mesh elements, at that the mesh structure density of elastic-resilient mesh elements is within the optimal range of values of 1.2 g/cm3-2.0 g/cm3, at that the wire material of the resilient mesh elements is steel of type EI-708, and its diameter is in the optimal range of values of 0.09 mm - 0.15 mm, at that the first layer facing the surrounding environment of the operator is processed with foam multifunctional composition for degassing, disinfection, desinsection, deactivation and shielding surfaces, volumes and objects against hazardous agents and substances with foam, where the liquid phase of the foam is a solution of clathrate didecyldimethylammonium halogenide with carbamide as active ingredient in an amount of from 0.1 to 5% by weight, and clathrate didecyldimethylammonium halogenide with carbamide is used as clathrate didecyldimethylammonium chloride with carbamide and/or clathrate didecyldimethylammonium bromide with carbamide. |
 Equipment of rescuer acting under conditions of emergency situations / 2506525Invention relates to equipment of rescuers in emergency situations, in particular for equipment of rescuers during rescue and salvage operations. The equipment of rescuer comprises light protective suit of rescuer, which consists of trousers with protective stockings, a shirt with a hood, mittens and balaclava, protective vest against electromagnetic radiation. The equipment of a rescuer additionally comprises a unit of mobile fire extinguishing. The unit comprises a portable means of fire extinguishing in the form of a stored-pressure extinguisher, the liquid supply system with foam generator, and the gas (air) supply system. The fire extinguisher with lock and release manual device is filled with non-flammable liquid. The gas supply system comprises a microswitch which is mounted on the lock and release device of the fire extinguisher. When starting the fire extinguisher a compact compressor is switched simultaneously, that operates from a portable battery unit. The foam generator comprises a cylindrical body which is made with an opening for supplying foamer solution from the fire extinguisher, and rigidly connected to it by a coaxial cylindrical sleeve. Inside the housing there are three cavities: a confusor, a cylindrical cavity and a diffuser. The diffuser is connected to the sleeve, in which on its edges the tangential channels are made for ejecting air. The sleeve is closed from the end opposite the diffuser through the swivel nut by circular plate with perforation in the form of holes. |
 Clothing of rescuers operating under conditions of flying and falling objects of breaking object / 2503917Clothing of rescuers consists of a protective jacket, a bib overall, a waistcoat, and a helmet of rescuer. The protective jacket is provided with a protective sheath of fabric lining which is connected to the protective shells. In the fabric lining there are elastic frame racks secured by clamps on the belt. The protective shells are secured on the elastic frame racks. The protective shell is made of three layers. The first layer faces the environment surrounding the operator and is made in the form of interconnected rings of stainless steel. The third layer faces the body of the operator and is made of perforated polymeric material. The second layer is located between the first and third layers and is made of elastic of elastic mesh elements. The mesh structure density of the elastic mesh elements is in the range of 1.2 g/cm3-2.0 g/cm3, at that the wire material of the elastic mesh elements is steel EI-708, and its diameter is in the optimal range of values of 0.09 mm-0.15 mm. |
 Light protective suit of rescuer acting under conditions of high toxic substances / 2503916Light protective suit of rescuer consists of trousers with protective stockings, a shirt with a hood, two-fingered gloves and a balaclava and a protective waistcoat. The stockings end with rubber vamp with overshoes, which are stitched to tie-strings for fastening to the legs. At the back the intermediate half belt is stitched to the lower edge of the shirt, which is passed between the legs and fastened with a button at the lower part of the shirt in front. The sleeves end with loops which are put on the thumb after putting on the gloves. The hood is fixed on the neck with the ribbon and a plastic prong. The protective waistcoat against electromagnetic radiation consists of a fabric lining which is connected to the protective shell. In the fabric lining the elastic frame racks are secured by clips to the belt. The protective shell is attached to the elastic frame racks and is made of three layers. The first layer faces the environment surrounding the operator, processed with foamed multifunctional composition for degasification, disinfection, disinsection, deactivation and shielding of surfaces, volumes and objects against dangerous agents and substances with the foam. The liquid phase of the foam is a solution of clathrate didecyldimethylammonium halide with carbamide as active ingredient in an amount of from 0.1 to 5% by weight, and clathrate didecyldimethylammonium halide with carbamide is used as clathrate didecyldimethylammonium chloride with carbamide and/or clathrate didecyldimethylammonium bromide with carbamide. |
 Clothing of rescues operating under conditions of electromagnetic emission / 2503915Clothing of rescuers consists of a protective jacket, bib overall, waistcoat and a helmet of rescuer. The protective jacket is made with a protective shell. The shell consists of a fabric lining which is connected to the protective shells. In the fabric lining the elastic frame racks are secured by clamps on the belt. The protective shells are secured to elastic frame racks. The protective shell is made of three layers. The first layer faces the environment surrounding the operator and is made in the form of interconnected rings. The rings are made of stainless steel. The third layer faces the operator's body and is made of a perforated polymer material. The second layer is located between the first and third layers and is made of a composite material which comprises a polymeric dielectric binder and the magnetodielectric fine-dispersion filler. The polymeric dielectric binder is polyorganosiloxane oligomer with the addition of a catalyst based on gamma-aminopropyltriethoxysilane, and the magnetodielectric fine-dispersion filler is made of an alloy of iron and aluminium. |
 Combat garment suit of rescuers operating under conditions of biogeneous circumstances / 2503914Combat garment suit of rescuers comprises a jacket with a hood, a protective waistcoat, and also trousers and high boots. The protective waistcoat consists of a fabric lining with a protective shell. In the fabric lining the elastic frame racks are secured by clips to the belt of the pants. The protective shell is attached to the elastic frame racks and comprises the outer and the inner protective packets between which the interlining is placed. The interlining is made in the form of a ribbon with fixed folds which are located at a constant pitch from the side of the protected object. The outer packet faces the environment surrounding the operator and is made multi-layered. Each layer is made in the form of interconnected rings of stainless steel. The layers are located to overlap the ring clearance by their articulation. The inner protective packet is made of three layers. Two upper layers are made of the perforated polymer material. The intermediate layer is made elastic of elastic mesh elements. The mesh structure density of the flexible-elastic mesh elements is in the range of values of 1.2 g/cm3-2.0 g/cm3. The wire material of the elastic mesh elements is steel EI-708. The fabric used for the garment upper part is the textile material which comprises the biologically-active polyester fiber. |
 High-strength stainless steel for oil wells and pipe made thereof / 2519201Proposed composition contains the following substances, in wt %. C: not over 0.05, Si: not over 1.0, Mn: not over 0.3, P: not over 0.05, S: less than 0.002, Cr: over 16 and not over 18, Mo: 1.5-3.0, Cu: 1.0-3.5, Ni: 3.5-6.5, Al: 0.001-0.1, N: not over 0.025 and O: not over 0.01, Fe and impurities making the rest. Steel features microstructure including martensite phase, 10-48.5 wt % of ferrite phase and not over 10 wt % of residual austenite phase. Steel yield point makes at least 758 MPa while uniform elongation makes at least 10%. |
FIELD: metallurgy.
SUBSTANCE: proposed steel contains components in the following ratio in wt %: carbon - 0.28-0.40, silicon - 0.80-1.40, manganese - 0.50-0.80, chromium - 0.10-0.70, nickel - 1.50-2.20, molybdenum - 0.30-0.80, aluminium - 0.005-0.05, copper - not over 0.30, sulphur - not over 0.012, phosphorus - not over 0.015, iron making the rest. Molybdenum-to-carbon ratio makes 0.8-2.0. Steel blanks are heated to hot deformation temperature to carry out rolling at specified reduction and to quench with tempering. Quenching is performed at press with cooling in water at the pressure of 150-500 kg/cm2 and water flow rate of 0.2-0.5 m3/h.
EFFECT: higher bullet-proof properties.
4 cl, 2 tbl
The invention relates to the production of high-strength sheet steel armour used for the manufacture of shells lightly armored vehicles, parts armor stationary objects and means of individual protection.
High-strength materials are specific behavior in conditions of dynamic loads and should have high values of ultimate strength and yield strength of metal, which are determined by the morphology of the formed microstructure after thermal processing.
Known compositions of high-strength armour steel [1-3] do not provide the necessary properties for comprehensive protection against new means of destruction due to the imbalance of contents carbidopa and nearbygalaxy alloying elements in steels in relation to carbon, which results at heat treatment to the formation of martensite unwanted morphology and substructure, or to insufficient level of doping of the cementite or to the formation of large special carbides, negatively affecting the properties of the reservation.
Analogue of the invention is steel [4], with the following composition, mass%:
carbon 0,4-0,7 silicon 0,5-1,5manganese
0,3-1,5 chrome 0,1-2,0 Nickel 1,0-5,0molybdenum
0,2-1,0 iron elseFamous steel armor does not provide at heat treatment required a stable complex of strength and plastic properties of metal and technical characteristics of means of protection. Sheet steel has a low survivability due to the tendency to brittle destruction caused by high content of carbon and carbidopa elements to 2.0% of the mass.
Analogue of the invention is high-strength steel sheet steel for protection against bullets tooth [5], which contains components in the following ratio:
carbon0,44-0,48
silicon 1,2-1,6manganese
0,3-0,6 chrome1.3 to 1.7
Nickel 1,4-1,8molybdenum
0,2-0,4 iron elseThe disadvantage of armored steel is a high content of carbon and chromium, which in the process of thermal treatment are formed special chromium carbides type (Fe,Cr) 7 C 3 dislocations and their subsequent coalescence on the limits of the austenitic grain and martensite increasing tendency began to brittle destruction and reducing armor resistance steel.
Analogue of the invention is armored heat-resistant weldable steel [6], with the following composition, mass%:
carbon0,001-0,41
silicon0,10-2,6
manganese
0,10-1,8
chrome0,10-8,6
Nickel0,10-1,9
molybdenum
0,10-0,6
cobalt0,05-4,6
copper0,10-1,9
sulfurnot more than 0,004
phosphorus
not more than 0,008
iron elseThe disadvantage of this steel is that the achieved level of armored properties are provided only more expensive alloying components, such as cobalt, which is inserted in the amount of up to 4.6%, Nickel and copper to 1.9% mass at high the silicon content (to 2.6%of mass) and chromium (to 8.6%of mass). This significantly increases the cost of armored steel (20% to 30% per ton) and use it becomes economically unviable. In addition, the steel is difficult material in technology use, which leads to low stability armored properties, the high level of marriage and additional expenses for its production.
The closest analogue of the declared high-strength sheet steel armour for protection is armor steel [7]with the following composition:
carbon0,45-0,50
silicon0,17-0,40
manganese
0,60-0,80
chrome 1,0-1,3 Nickel1,20-1,5
molybdenum
0,25-0,35
vanadium
0,08-0,15
copper 0,1-0,2 sulfur0,005-0,01
phosphorus
0,003-0,01
zirconium
0,005-0,01
tungsten
0,01-0,05
iron elseUsing known leaf Stati as the reservation is possible only in the thickness exceeding 15 mm when the energy moves is determined by the high specific weight of the protective brennelemente and microstructure is a secondary factor characterizing the material in this process.
The specified content of chromium and molybdenum in the famous steel is not possible to obtain after the heat treatment the structure nizkozatratnogo martensite with high plasticity and low tendency to brittle destruction, which reduces bulletproof and ballistic resistance of the reservation, because the heat treatment of formed carbide, chromium and molybdenum with a high level of doping on the limits of martensite crystals and the original grain of austenite, thereby increasing the embrittlement of the metal at high loads.
The objective of the invention is to provide bullet-proof resistance thin armour, made of medium alloy steel steel alloying level, providing a balanced ratio carbidopa elements to carbon, and the formation of carbide phase on the basis of doped cementite and is supposed martensite during thermal treatment of sheet metal, achieving a ratio of strength to the plasticity σ in /σ 0,2 >1,1.
The problem is solved at the expense of what is proposed armored high-strength steel that contains carbon, silicon, manganese, chromium, Nickel, molybdenum, aluminum, copper, sulfur, phosphorus and iron in the following ratio of components, mass%:
carbon0,28-0,40
silicon0,80-1,40
manganese
from 0.50 to 0.80
chrome0,10-0,70
Nickel1,50-2,20
molybdenum
0,30-0,80
aluminium
0,005-0,05
coppernot exceeding 0,30
sulfurno more 0,012
phosphorus
no more than 0,015
iron elseThe technical result of the invention is to increase bullet-proof durability and survivability sheet armor even in sheets with a thickness less than 10 mm, which is due to the fact that the content carbidopa elements (silicon, chromium and molybdenum) in relation to the carbon balance out to a level where during heat treatment rolled products (canned mushrooms low-vacation) is formed by a cementite followed by separation of the carbides in the amount of martensite crystals within primary austenitic grain, coherent metal matrix that reduces the propensity of armor to brittle destruction leads to the formation of the microstructure with the morphology of lath martensite, possessing high strength and ductility and, as consequence, high power intensity in high-speed load sheet armor.
The carbon content of less than 0.28% mass the degree of tetragonality of martensite lattice insufficient for formation of the necessary substructure of martensite at hardening, providing high hardness and durability of armor.
The carbon content of more than 0.40% mass in the process of quenching medium alloy steel steel in the metal structure are formed non-stoichiometric on carbon carbides and dvoynikova martensite with a high propensity to brittle destruction and low viscosity that will lead to the conception and development of cracks in the process of making the reservation (edit, stamping etc) and its operation.
The Nickel improves plasticity and viscosity of hardened metal and accelerates the coalescence of carbides, shifting it to the region of lower temperatures compared to non-alloy steel. With the Nickel over 2,20% mass there is intense coalescence of carbides and their growth in size to reduce the positive effect of Nickel on the plasticity. In addition, in the microstructure of lath martensite appears residual austenite, which further reduces flexibility and increases the tendency began to brittle destruction in the production of sheet and changes (decreases) his brestaurant. With Nickel content of less than 1.5 wt.% reduced plasticity of metal due to the insufficient level of doping.
Introduction in structure of armour steel according to the invention of sulfur, phosphorus, aluminium and copper in the declared limits contributes to the achievement of stability high strength and plastic properties, as at hardening is formed of small grain with minimal resistance to the processes of phase transitions.
The closest production technology of rolled sheets of steel is the method [7], which consists in the blanks heating up to the temperature of hot deformation, with subsequent rolling with regulated compression and quenching with tempering, with heated billets before rolling subjected hot forging at the temperature 1100-800 C, isothermal annealing at a temperature 630-670°C furnace cooling and re-heating for rolling up to the temperature 1050-1100°C in an oven with a neutral atmosphere, and after quenching with tempering - additional holidays, and rolling is carried out at a temperature of 1100-800°C with a total compression at least 80%.
The disadvantage of this method is complexity of technology, such as the multi-stage system, as well as high energy consumption due to the fact that a number of stages demands a high temperature.
The challenge facing the invention related to the production technology of rolled sheets, is simplification of rental offer sheet material.
Method of production of rolled sheet according to the invention consists in heating of workpieces up to the temperature of hot deformation, with subsequent rolling with a regulated compression and quenching with tempering, hardening steel spend in the press under pressure 150-500 kg/cm 2 and cooling water when the water flow of 0,2-0,5 m 3 /hour
The invention can be illustrated by the following examples.
High-strength medium alloy steel armor steel was smelted in an electric arc furnace with capacity of 150 tons with the subsequent processing of slags in the ladle. Steel is poured on the installation of continuous casting of billets 180 x 250 mm, weight up to 25 tons, which rolled out across the plate thickness 2-20 mm Then blanks rolled sheet was subjected to heat treatment, including training in the press under pressure 250 kg/cm 2 with cooling water flow rates of 0.3 m 3 /h and have low vacation at a temperature of 150-250°C in the kiln.
The different composition of steel melts presented in Table 1.
The ratio of molybdenum for carbon is maintained in the range of mass.% 1.0 to 2.0.
Preferably high content of molybdenum with the average content of carbon and respect to the ratio molybdenum/carbon in the range of 0.8-1.2 wt.%, the content of chromium is preferable at the level of 0.2-0.3 wt.%. In this case, suppressed the formation of twin martensite, and its volume fraction does not exceed 5% of the dispersed substructure of lath martensite. The regimes of heat treatment chosen, taking into account a thickness of armour, which varied from 2.3 to 6,5 mm Cards for testing, according to the normative documentation (GOST R 50963), cut out from a sheet steel invention after the final heat treatment and subjected to fire bullets of 7.62 mm at speed of 435 m/s and the number of shots 4-6. The results of tests on the bullet-proof resistance are given in table 2.
All of defeat for the proposed composition of steel were suitable. On the cards are made of steel of the prototype, after testing in similar conditions found on the back side of the crack and split.
The given data shows that in the proposed high-strength sheet steel armour level of technical properties increased due to the achieved combination of high strength and plastic properties and increase resistance of development of cracks due to a balanced level alloying of steel, ensuring the formation of fine microstructure with the morphology of lath martensite and carbides on the basis of doped cementite evenly distributed around submicrostructure.
Experience in manufacturing armour of steel proposed composition shows that the production process is more technologically advanced and simple in comparison with the prototype.
Table 1number of
The content of alloying elements and impurities,%
C Si Mn Cr Ni Mo Al Cu S P 1 0,28 0,80 0,50 0,10 1,50 0,30 0,005 0,10 0,004 0,005 2 0,32 0,85 0,57 0,20 1,66 0,27 0,016 0,15 0,006 0,006 3 0,35 1,16 0,66 0,27 1,87 0,34 0,027 0,17 0,007 0,008 4 0,38 1,30 0,71 0,42 2,15 0,46 0,040 0,25 0,009 0,013 5 0,41 1,42 0,81 0,52 2,25 0,51 0,055 0,32 0,013 0,016 6 0,30 0,75 0,76 0,15 1,85 0,48 0,025 0,17 0,004 0,006 7 0,31 0,76 0,78 0,45 1,83 0,23 0,027 0,19 0,005 0,007 8 0,39 1,32 0,54 0,27 1,56 0,31 0,028 0,21 0,005 0,005 9 0,38 1,34 0,57 0,30 2,15 0,46 0,031 0,24 0,006 0,008 10 0,34 1,17 0,78 0,31 1,72 0,37 0,035 0,25 0,007 0,009 11 0,35 1,13 0,67 0,29 1,75 0,39 0,028 0,23 0,005 0,011Analogue 2400558 №13
0,28 1,60 0,40 0,30 0,85 2,0 Co 3,30 0,45 0,003 0,004The prototype for 2456368
0,34 0,23 0,50 1,84 2,02 0,84 0,015 0,29 0,002 0,011Table 2 The results bulletproof test was conducted in accordance with GOST R 50963. The average speed of the bullets shot cards were respectively: a TT pistol (cartridge 7.62 mm bullet SST) - 435 m/s
Card number
Sheet thickness, mm
Assessment of defeat
Cards on the invention
103 2,40conforming
2,40conforming
2,40conforming
135 2,35conforming
2,35conforming
2.35conforming
746 2,60conforming
2,60conforming
2.60conforming
733 2,65conforming
2,65conforming
2,65conforming
Cards on the prototype
1 2,40breaking through
2 2,35breaking through
3 2,35breaking through
The list of information sources
1. EN 2236482 C1, SS 38/46, publ. 20.09.2004,
2. EN 2236482 C1, SS 38/46, publ. 20.09.2004,
3. JP 2006-070327 C22C 38/00, publ. 16.03.2006,
4. US 5122336, SS 38/44, publ. 16.06.1993,
5. EN 2185459, C1, SS 38/44, publ. 20.07.2002,
6. EN 2400558, C22C 38/58, publ. 27.09.2010,
7. EN 2456368, SS 38/50, publ. 20.07.2012,
8. US 5122336, SS 38/44, publ. 16.06.1992,
1. High-strength steel sheet steel that contains carbon, silicon, manganese, chromium, Nickel, molybdenum, aluminum, copper, sulfur, phosphorus and iron, wherein it contains components in the following ratio, mass%:
carbon0,28-0,40
silicon0,80-1,40
manganese
from 0.50 to 0.80
chrome0,10-0,70
Nickel1,50-2,20
molybdenum
0,30-0,80
aluminium
0,005-0,05
coppernot exceeding 0,30
sulfurno more 0,012
phosphorus
no more than 0,015
iron elsethe ratio molybdenum/carbon is 0,8-2,0.
2. Steel according to claim 1, wherein the content of chromium in the composition is at the level of 0.2-0.3 wt.%.
3. Steel according to claim 1, characterized in that the ratio of molybdenum/carbon in is at the level of 0,8-1,2.
4. Method of production of rolled sheet of high-strength steel armour according to claim 1, which includes heating of workpieces up to the temperature of hot deformation, with subsequent rolling with a regulated compression and quenching with tempering, quenching spend in the press with cooling water pressure 150-500 kg/cm 2 and consumption of 0,2-0,5 m 3 /hour.