100 results about "Alclad" patented technology

The utility model relates to the field of plate processing equipment, and discloses a novel aluminized zinc alloy plate roller coating device which comprises a conveying structure, a roller coating assembly and a scraper structure, base tables are arranged on the two sides of the bottom of the conveying structure, supporting plates are arranged on the two sides of the tops of the base tables, and connecting columns are arranged on the two sides of the supporting plates. A conveying belt is installed in the connecting column body, one side of the conveying belt is connected with the conveying belt, and a back supporting roller is arranged in the middle of the conveying belt; side plates are arranged on the two sides of the outer portion of the roller coating assembly, roller bodies are arranged in the side plates, control handles are arranged outside the side plates and connected with the roller bodies, a support plate is arranged at the tops of the side plates, and a motor is arranged at the top of the support plate and communicated with the roller bodies. The scraper blade structure comprises a connecting plate, a supporting column, a telescopic spring and a scraper blade. According to the utility model, the adjusting roller is arranged to freely adjust the coating thickness of a plate, and the scraper structure is arranged to perform a scraping function, so that the coating is smooth.

The utility model relates to the technical field of aluminum feeding devices, in particular to a special aluminum feeding device for an aluminum plating machine, which is convenient for feeding, improves the working efficiency and enhances the practicability. Comprising a machine body, a feeding mechanism comprises a bottom plate, the bottom plate is connected with the machine body through bolts, a support is fixedly installed on the bottom plate, a thread rolling disc is placed on the support, a feeding box is fixedly installed on the bottom plate, a working cavity is formed in the feeding box, two box doors are installed at one end of the working cavity in a communicating mode, and a feeding pipe is installed at one end of the working cavity in a communicating mode; a cleaning device is arranged at the input end of the feeding pipe, a base is fixedly installed at the bottom end of the working cavity, a driving roller is rotationally installed on the base, a first groove is formed in the driving roller in a surrounding mode, a motor is fixedly installed on the base, the output end of the motor is fixedly connected with one end of the driving roller, an electric push rod is fixedly installed at the top end of the working cavity, and a U-shaped plate is fixedly installed at the bottom end of the electric push rod. And a driven roller is rotationally mounted on the U-shaped plate.

The application relates to the technical field of image recognition, and discloses a method for detecting explosion welding defects of plated aluminum-zinc-silicon coil plates based on X-ray images. The method acquires an X-ray image sequence of an explosion welding interface of a plated aluminum-zinc-silicon coil plate and inputs the sequence into a physical constraint feature decoupling network, the network comprising a feature extraction backbone, a physical attenuation constraint branch and a defect identification branch. The physical attenuation constraint branch calculates a physical reconstruction loss of a multi-scale space feature map according to an X-ray mass attenuation coefficient matrix of the plated aluminum-zinc-silicon alloy, and reversely propagates the loss to the feature extraction backbone as a regularization term, so as to forcibly separate speckle background features conforming to the physical attenuation law. The application makes the feature decoupling comply with the physical attenuation law, eliminates the interference of speckle artifacts on micro-defect judgment, and avoids missed detection caused by micro-defects being covered by speckles.

This invention discloses an ultra-high strength hydroformed structural component and its manufacturing process, comprising the following steps: First, an aluminum-silicon coated aluminized hot-formed steel pipe is selected to form a welded pipe, and the substrate of the structural component is obtained by hydroforming; Second, a pretreatment system is established for the substrate before heating, and the substrate from step one is transferred into the solution in the pretreatment system and immersed; Third, the pretreated substrate is placed in a heating furnace at - degrees Celsius, so that the solution forms carbides under high temperature, and the substrate is removed after being heated to the set temperature; Fourth, the substrate from step three is placed in a mold with a water flow cooling function, and the upper and lower molds are pressed together to quickly cool and quench the pipe. This invention relates to the field of industrial production technology. This invention can form carbides in the substrate under high temperature through immersion in the solution, without forming oxides, which greatly improves the structural strength of the structural component.

The application provides a pre-coated steel sheet for hot stamping forming, a manufacturing method of the pre-coated steel sheet, a hot stamping forming part, a manufacturing method of the hot stamping forming part and application. 2 When the pre-coating weight is 20-60 g / m 2 , the surface roughness Ra and Rpc of the coating after hot forming are ensured to be high by controlling the surface roughness Ra and Rpc of the pre-coating; the uniformity of the pre-coating weight is stably controlled by controlling the shape of the pre-coating steel sheet and the parameters of the air knife after aluminum-silicon plating; the uniformity of the coating liquefaction and flow after heating is ensured by controlling the uniformity of the pre-coating weight and the uniformity of the heating temperature in the heating process during hot forming, so that the surface roughness Ra and Rpc of the coating after hot forming are uniform. The coating of the hot stamping forming part produced by the application has high and uniform surface roughness Ra and Rpc, so that the whole part has good paint adhesion and corrosion resistance.

A manufacturing method of an aluminum-coated steel sheet includes preparing aluminum (Al) scraps, manufacturing an ingot using the Al scraps, coating a base steel using the ingot, and processing a coated steel sheet. An aluminum-coated steel sheet includes a base steel, and a coating layer formed on the base steel, and the coating layer may contain 8.9 to 9.6 wt % of Si, 1.3 wt % or lower of Fe, 0.7 wt % or lower of Mg, the remainder Al, and other unavoidable impurities.

The utility model discloses a beta radiation detection device based on an aluminized plastic scintillator detector, and belongs to the technical field of nuclear radiation measuring instruments. The photomultiplier comprises a stainless steel shell, an aluminum shell is arranged in the stainless steel shell, an aluminized plastic scintillator is arranged at the top of the aluminum shell, a photomultiplier is arranged in the aluminum shell, and the photomultiplier is located at the bottom of the aluminized plastic scintillator. According to the utility model, through the arrangement of the aluminum-plated plastic scintillator, the aluminum layer is directly deposited on the plastic scintillation sheet through the magnetron sputtering process, so that the traditional aluminum-plated film is effectively replaced, the structure of the detection device is further simplified, the production cost is also obviously reduced, and the aluminum layer and the plastic scintillator can be tightly combined through the magnetron sputtering process; compared with the prior art, extra assembling steps are avoided, manpower and material consumption is reduced, production efficiency is improved, and the durability of the detector is enhanced due to the fact that the aluminum layer is directly deposited on the surface of the plastic scintillator.

The application provides a hot-dip aluminum-silicon 980MPa Q&P steel cold forming steel plate and a preparation method thereof, and the component of the hot-dip aluminum-silicon base plate is as follows in percentage by mass: C: 0.18% to 0.24%, Si: 1.4% to 2.8%, Mn: 1.9% to 2.5%, P: less than or equal to 0.02%, S: less than or equal to 0.005%, Ti: 0.01 to 0.04%, Nb: less than or equal to 0.04%, Al: less than or equal to 0.005%, and the balance of Fe and inevitable impurities. The preparation method comprises a series of processes such as smelting, hot rolling, pickling, cold rolling, continuous annealing hot-dip aluminum-silicon, and finishing, and the hot-dip aluminum-silicon is ingeniously carried out in the slow cooling stage, perfectly matches the heat treatment system, breaks the limitation that the hot-dip galvanized steel plate must be over-aged at high temperature for a short time, and can make the bainite transformation sufficient; the hot-dip aluminum-silicon 980MPa Q&P steel produced by the application has excellent strength and plasticity.

The invention relates to a production method of a high-corrosion-resistance cold-rolled hot-dip aluminum-zinc-plated steel plate. The production method comprises the following steps: regulating and controlling components of a base plate in a steelmaking process; regulating and controlling the zinc pot process; regulating and controlling a cooling process after plating; and regulating and controlling a post-treatment process and the like. According to the production method of the high-corrosion-resistance cold-rolled hot-dip aluminum-zinc-plated steel plate, the corrosion resistance of the product is effectively improved by comprehensively improving the three aspects of the base plate, the plating layer and the film layer, and compared with an aluminum-zinc-plated building material product produced through a traditional technology, the corrosion resistance of the high-corrosion-resistance cold-rolled hot-dip aluminum-zinc-plated steel plate is improved by 25% or above.

The application provides an aluminized silicon steel and a preparation method thereof, a pre-coated steel and a production process of a hot-formed component. The aluminized silicon steel comprises a pre-coating layer arranged on a steel base. The pre-coating layer comprises an intermediate layer and an aluminized silicon coating layer. The nominal thickness of the aluminized silicon coating layer is 10-33 microns. The aluminized silicon coating layer contains Al-Si phases with a proportion of 5-40% and Al-Si-Fe phases with a proportion of 0.1-15%. The dispersion index of the Al-Si phases and the Al-Si-Fe phases in the aluminized silicon coating layer is greater than or equal to 0.05. In the aluminized silicon steel, the proportions of the Al-Si phases and the Al-Si-Fe phases in the aluminized silicon coating layer are appropriate, and the dispersion index is appropriate, which is helpful to the production of a hot-formed component with small grains. The hot-formed component has a double-layer Al-rich intermetallic compound layer, thereby improving the coating toughness and environmental tolerance of the hot-formed component, reducing the crack sensitivity, and improving the hydrogen brittleness resistance and corrosion resistance of the hot-formed component.

The application provides 800MPa-grade hot-dip aluminized silicon high-hole-expanding multiphase steel and a preparation method thereof. The composition of the steel plate is as follows in terms of percentage by weight: C: 0.06% to 0.09%, Si: 0.1% to 0.4%, Mn: 1.8% to 2.5%, Cr: 0.1% to 0.4%, Mo: 0.05% to 0.3%, Ti: 0.01% to 0.03%, Nb: 0.01% to 0.03%, P: less than or equal to 0.02%, S: less than or equal to 0.005%, 1 / 3: less than or equal to Mo / Cr: less than or equal to 2 / 3, 2.2%: less than or equal to Mn+Cr: less than or equal to 2.8%, and the balance of Fe and inevitable impurities. The chemical composition of the coating includes the following components in terms of percentage by weight: Al content: 88% to 93%, and Si content: 7% to 12%. The production method of the steel plate comprises a series of processes such as smelting, hot rolling, pickling, cold rolling, continuous annealing and aluminized silicon plating, and the structure of the steel plate comprises ferrite, bainite and martensite. In terms of the planar area method, the ferrite content is 18% to 35%, the bainite content is 35% to 62%, and the martensite content is 10% to 40%. The mechanical properties of the steel plate of the application are as follows: tensile strength is more than 800MPa, yield strength is 620MPa to 750MPa, elongation is greater than 14%, and the hole-expanding value is more than 50%, so that the steel plate has good strength and plasticity and formability, and meanwhile, the hole-expanding performance is excellent.

The invention particularly relates to a polyimide flexible composite film for spaceflight and a preparation method of the polyimide flexible composite film. The polyimide flexible composite film for spaceflight comprises an optical function layer, a supporting layer, a bonding layer and a reinforcing layer which are sequentially stacked. According to the invention, through the design and preparation process of the four-layer structure composite film, the product weight reduction is realized, the weight is reduced compared with the existing product, and the launch cost of a spacecraft can be reduced; the heat control performance is good, the solar absorption ratio of an aluminized surface is low, the hemispherical emissivity is low, the alpha s / epsilon h ratio is small, and the heat control characteristic is superior to that of a traditional aluminized film; an ultra-thin structure design is adopted, and the thickness is smaller than that of existing similar products; by introducing the silicon dioxide protective layer, the tolerance of the aluminum layer to atomic oxygen is improved, the service life of the material in a space environment is prolonged, the optical performance change is small after a thermal cycle test, and the material has good environmental adaptability; meanwhile, certain electromagnetic shielding capability is achieved, and the aerospace application requirement can be met.

The present invention belongs to the field of welding materials, specifically a flux-cored wire containing surface-aluminum-plated titanium carbide particles. It includes an outer skin and a flux core, and the chemical composition and dosage of the flux core are calculated by mass percentage as follows: surface-aluminum-plated titanium carbide particles 8.0%-12.0%, aluminum powder 2.0%-3.0%, chromium powder, molybdenum powder and nickel powder 16%-20% in total, and the mass ratio of chromium powder, molybdenum powder and nickel powder is 52:96:59, ferrosilicon powder 3.0%-5.0%, ferromanganese powder 4.2%-5.8%, ferrovanadium powder 2.8%-4.0%, fluorite powder 3.2%-5.0%, rutile powder 2.8%-4.0%, calcium carbonate powder 3%-5%, and the rest is iron powder. The titanium atoms and iron atoms of the titanium carbide particles of the present invention form metallic bonds and produce a strong bond, and the time taken for the deposited metal to wear 0.5mm is increased to 1.5 times the original time, effectively improving the wear resistance of the deposited metal.

A cooling device and a cooling method for hot-dip plated strip steel, relate to the technical field of hot-dip plating, the cooling device comprises a main cooling air box and an auxiliary cooling air box, the auxiliary cooling air box is located between the main cooling air box and a coating thickness control device, and the auxiliary cooling air box is configured to output a low-pressure airflow to the surface of the strip steel to pre-cool the surface coating of the strip steel. The auxiliary cooling air box uses a low-pressure airflow, thereby avoiding disturbance to the un-solidified coating. The coating after pre-cooling has been preliminarily solidified, and does not need to be naturally cooled for a long distance, thereby not only shortening the setting distance of the main cooling air box, but also reducing the specification requirement of the main cooling air box, thereby reducing the overall land occupation of the cooling system from two aspects, and improving the efficiency and safety of the production process. Meanwhile, the auxiliary air box has low wind speed and small air pressure, can preliminarily cool the aluminum liquid, can rapidly cool the strip steel to below the melting point of the aluminum liquid, realizes refinement of aluminum flowers, and improves the corrosion resistance and surface quality of the hot-dip aluminum layer.

Aluminizing process for a nickel-containing substrate. The invention relates to a process for depositing doped aluminum using a physical vapor deposition method, then melting the aluminum and performing a diffusion heat treatment to produce a modified aluminized coating. This process can be used for manufacturing turbomachine blades. Figure for abstract: Fig. 3.

A crease eliminating method for a color-coated sheet for a downpipe relates to the technical field of manufacturing of color-coated steel sheets, and comprises the following steps: optimizing raw material components (SPHC hot rolled steel comprises 0.03-0.05% of C, less than or equal to 0.03% of Si, less than or equal to 0.25% of Mn, less than or equal to 0.020% of S / P, and 0.02-0.06% of Al), cold rolling (the reduction rate is less than or equal to 85%, and the yield after cold rolling is less than or equal to 850 MPa), aluminum and zinc plating annealing (the direct combustion section is 610-660 DEG C, the RTF section is 780-820 DEG C, and the thermal expansion chamber is 520-560 DEG C); fast cooling and isothermal treatment at 600 DEG C for 15 seconds; and according to the color coating process (curing at the temperature of 216-224 DEG C, slow cooling at the plate temperature of 70-80 DEG C and stretching and straightening elongation of greater than or equal to 0.3%), the yield strength of the product is 270-350 MPa, the elongation of the product is greater than or equal to 25%, and bending creases are eliminated.

The invention belongs to the technical field of metal material surface engineering, and discloses a matching pair composed of a coated steel plate and a coated fastener and a manufacturing method of the matching pair, and by controlling components, processes and matching gaps of a base body and a plating layer of each matching pair assembly, the coated steel plate and the coated fastener are enabled to have good corrosion resistance on the basis that the coated steel plate and the coated fastener have good corrosion resistance. And the mutual galvanic corrosion tendency is reduced to the minimum, a good connection corrosion resisting effect is achieved, and the aluminum-plated galvanized sheet is particularly suitable for occasions where a connection assembly needs to be formed by a galvanized sheet and an aluminum-plated fastener. The invention also provides a non-transitory readable recording medium storing the program of the method and a system comprising the medium, and the program can be called through a processing circuit to execute the method.

A joint structure according to one embodiment of the present disclosure comprises a first press-formed member and a second press-formed member that are made of steel, a welding bead that joins the first press-formed member and the second press-formed member, and a heat affected zone that is present around the welding bead, wherein one or both of the first press-formed member and the second press-formed member have an aluminum-based plating layer on at least one surface thereof, and the average aluminum concentration of the welding bead is 1.0 mass% or less. Preferably, the joint structure has a plating removed portion that extends along the welding bead, between the welding bead and the aluminum-based plating layer.

The invention discloses an aluminum-silicon plating pot skirt edge deslagging device and a using method, the deslagging device comprises an aluminum-silicon plating pot and a skirt edge arranged at the aluminum-silicon plating pot, and a slag blowing assembly and a deslagging assembly are correspondingly arranged on the two sides of the skirt edge respectively; each slag blowing assembly comprises a slag blowing pipe penetrating through the skirt edge, a nozzle is arranged on the front side, located in the skirt edge of the aluminum-silicon pot, of the slag blowing pipe, and the spraying direction of the nozzle is obliquely downward towards one side of the slag discharging assembly; the slag discharging assembly comprises a slag pumping pipeline extending into the skirt edge from the lower portion of the skirt edge, and the bottom ends, located on the outer side and the inner side of the skirt edge, of the slag pumping pipeline are connected with a slag pumping pump and a slag suction opening correspondingly. According to the slag discharging device for the skirt edge of the aluminum-silicon plating pot and the using method, when the continuous aluminum-silicon plating line aluminum-silicon pot is normally produced, a set of slag discharging device is designed to extend into the skirt edge, air is blown towards the liquid level through the nozzle, aluminum slag is blown from one side of the skirt edge to the other side of the skirt edge, and then the aluminum slag is pumped out of the skirt edge through the slag pumping pump; therefore, the problem of more aluminum slag in a strip steel operation area is solved.

The present disclosure relates to a method for manufacturing aluminium deox, aluminium powder, and zinc oxide in a single batch process. The method comprises feeding galvalume dross into induction furnace to melt the galvalume dross. The method includes extracting zinc oxide powder, aluminium deox and aluminium powder from the molten galvalume dross.

The invention provides an evaporation method and application thereof, and relates to the technical field of vacuum evaporation, the evaporation method comprises the following steps: preheating an evaporation boat, a tungsten mesh and a solid aluminum source arranged on the tungsten mesh; pre-melting treatment is conducted, the solid aluminum source is melted, and molten aluminum covering part of the surface of the tungsten net is formed; pre-evaporation treatment is conducted, the molten aluminum is evaporated, and an initial infiltration area is formed; in the primary wire feeding stage, aluminum wires are fed at the first wire feeding speed, molten aluminum obtained after the aluminum wires are molten is spread in the initial infiltration area till the tungsten mesh is completely infiltrated by the molten aluminum, and at least part of the tungsten mesh is consumed; in the secondary wire feeding stage, aluminum wires are fed at the second wire feeding speed, and the tungsten net is completely consumed; and an evaporation stage: evaporating an aluminum metal layer on the base film. According to the evaporation method provided by the invention, the spreading uniformity and evaporation stability of the molten aluminum are improved, and the technical problems of narrow liquid level, frequent splashing and non-uniform coating thickness caused by non-uniform heat distribution in the traditional process are solved.

The utility model relates to the field of boats for aluminum plating, in particular to a boat for vacuum thermal evaporation aluminum plating. Comprising a metal base body, the upper surface of the metal base body is fixedly connected with upper surface ceramic, the lower surface of the metal base body is fixedly connected with lower surface ceramic, the sides, away from each other, of the upper surface ceramic and the lower surface ceramic are each provided with a groove, and the metal base body is divided into a middle layer and a ceramic surface layer; the metal matrix middle layer is made of high-temperature-resistant metal, the metal matrix middle layer is specifically made of tungsten, molybdenum and tantalum alloy materials (or two of the tungsten, molybdenum and tantalum alloy materials and a single metal material), the areas, used for connection, of the two ends of the metal matrix middle layer are thick, and the area in the middle of the metal matrix middle layer is thin. The vacuum thermal evaporation aluminum plating boat provided by the utility model has the advantages of good corrosion resistance, good heat transfer and good contact, and can be used for a long time.

The application belongs to the technical field of metal composite conductor materials, and discloses an aluminum-clad invar steel strand with high interfacial bonding strength and a preparation method thereof. The aluminum-clad invar steel strand comprises a strand structure formed by twisting a plurality of aluminum-clad invar steel single wires. The aluminum-clad invar steel single wire comprises, from inside to outside, an invar steel core, a zinc alloy transition layer, an aluminum layer and a composite corrosion-resistant layer. The zinc alloy transition layer contains zinc, aluminum and trace rare earth elements, which can improve the interfacial compatibility between the invar steel core and the aluminum layer and increase the interfacial bonding strength. The composite corrosion-resistant layer is composed of an inner anodic oxidation layer and an outer graphene reinforced layer, which can improve the corrosion resistance and service stability without significantly affecting the interfacial bonding performance. The preparation method comprises invar steel core preparation, zinc alloy transition layer hot-dip plating, aluminum layer continuous extrusion coating, composite corrosion-resistant layer construction and twisting into a strand.

A method of manufacturing a steel sheet plated with an Al—Fe alloy for hot forming. The method includes: aluminum-plating and coiling a base steel sheet to obtain an aluminum-plated steel sheet, where an amount of the aluminum-plating is 30 to 200 g / m2 based on one surface of the base steel sheet, and tension in the coiling is 0.5 to 5 kg / mm2; after the aluminum-plating, performing cooling to 250° C. at a rate of 20° C. / sec or less; annealing the aluminum-plated steel sheet to obtain the steel sheet plated with the Al—Fe alloy; and cooling the steel sheet plated with the Al—Fe alloy. The annealing is carried out for 30 minutes to 50 hours within a heating temperature range of 550 to 750° C. in a batch annealing furnace.

The application provides a hot-dip aluminized silicon 1470MPa grade Q&P steel cold forming steel plate, and the main components of the base plate of the hot-dip aluminized silicon are as follows in percentage by mass: C: 0.18% to 0.28%, Si: 1.0% to 2.0%, Mn: 2.4% to 3.2%, P: 0.02% or less, S: 0.005% or less, Ti: 0.01% to 0.04%, B: 0.002% to 0.005%, and one or more of Cr, Mo, Cu and Nb can be additionally added, wherein Cr: 0.1% to 0.4%, Mo: 0.1% to 0.4%, Cu: 0.2% to 0.6%, Nb: 0.01% to 0.04%, and the balance is Fe and inevitable impurities. The hot-dip aluminized silicon is ingeniously carried out in the slow cooling stage, is perfectly matched with the heat treatment system, breaks the limitation that the hot-dip galvanized steel plate must be over-aged at high temperature for a short time, can make the bainite transformation sufficient, and is beneficial to the mechanical properties of the steel plate; the hot-dip aluminized silicon 1470MPa grade Q&P steel produced by the application has super-high strength and good plasticity at the same time.

The utility model discloses a hot stamping assembly which is provided with a solid positive picture, the side face of the hot stamping assembly is provided with a first vent hole, the edge of the solid positive picture is provided with a second vent hole, and the first vent hole is communicated with the second vent hole. The hot stamping assembly and the first vent hole are connected with an air source, the air source can provide intermittent high-pressure air, when the hot stamping assembly and the alumite are in a combined pressing state, the air source is in a closed state, when the hot stamping assembly and the alumite are in an off-pressing state, the air source is in an open state, and at the moment, the hot stamping assembly and the alumite are in a closed pressing state. And the high-pressure gas can act on the outer surface of the alumite through the second vent holes, so that the alumite adhesive has the beneficial effects in two aspects: (1) the alumite can be quickly cooled by the high-pressure gas, the adhesive force of the adhesive is greatly improved, and the aluminum plating layer can be prevented from being stripped along with the base material layer to form spots; and (2) timely separation of the alumite film and the hot stamping assembly is facilitated, heat conduction of the hot stamping assembly to the alumite film is stopped, and formation of spots is prevented.

This aluminum-plated steel sheet for hot stamping has a steel sheet, an aluminum-plated layer located on the surface of the steel sheet, and a coating located on the aluminum-plated layer, in which the aluminum-plated layer has an Al content of 60 mass % or more, a thickness t1 of 10 to 60 μm, an area ratio of amorphous matter in the coating of 90% or more, the coating containing one or more elements selected from the group A elements consisting of Ce, Nb, Mo, W, and V, and a thickness t2 of 0.005 to 5.5 μm.

The application discloses a kind of nanocomposite aluminum base alloy for hot-dip aluminizing and hot-dip aluminizing method, and it relates to hot-dip plating technical field, it uses yttrium (Y) and cerium (Ce) to form composite rare earth modifier, synergistic nanocarbide strengthening phase, and compatibility necessary silicon (Si), iron (Fe), manganese (Mn) element, form a set of complete aluminum base alloy formula technical means, combined with supporting in-situ reaction synthesis and ultrasonic auxiliary preparation process, reached in significantly refining interface reaction layer, while greatly improving the effect of coating hardness, toughness, salt fog corrosion resistance and high temperature oxidation resistance comprehensive performance, successfully solved the key technical problems of existing hot-dip aluminizing technology nanometer reinforcing body dispersion difficulty, interface bonding force is weak, and traditional modification element function single, difficult to synergistically improve the key technical problems of coating strength and toughness and durability.

The present application relates to a kind of DH steel plate of 1200MPa grade of aluminum silicon coating and its manufacturing method, DH steel plate includes steel base plate and coating;The chemical composition of steel base plate is C:0.12%~0.23%, Si:0.2%~0.9%, Mn:1.8%~2.8%, Cr:0.2%~0.6%, Mo:0.05%~0.4%, P≤0.02%, S≤0.005%, Ti≤0.03%, Nb≤0.03%, the balance is Fe and impurity.It includes smelting, hot rolling, pickling, cold rolling, continuous annealing, aluminum silicon plating and finishing sequence in manufacturing method.The finished steel plate has excellent mechanical properties and surface quality by low-cost alloy design combined with reasonable process control;In the slow cooling stage, hot-dip aluminum silicon is carried out, which is matched with heat treatment system, breaks through the limitation that hot-dip galvanized steel plate must be high-temperature short-time overaging, makes bainite transformation sufficient, effectively improves the plasticity of DH steel.