259 results about "Sheet steel" patented technology

The invention relates to an ultrahigh-strength low-temperature maritime work wide thin steel plate with good cold working performance and a manufacturing method of the ultrahigh-strength low-temperature maritime work wide thin steel plate. The steel plate comprises the following chemical components in percentage by weight: 0.04% to 0.08% of C, 0.1% to 0.4% of Si, 1.0% to 1.6% of Mn, 5.0% to 8.0% of Ni, 0.4% to 0.7% of Cr, 0.8% to 1.2% of Mo, 1.0% to 1.5% of Cu, 0.2% to 0.3% of V, 0.025% to 0.045% of Ti, 0.025% to 0.040% of Zr, 0.03% to 0.06% of Als, 0.002% to 0.005% of B, less than or equal to 0.005% of P, less than or equal to 0.001% of S and the balance of Fe and inevitable impurities. A low-carbon component design is adopted, elements such as V and Ti are added, and elements such as Ni, Cr, Mo, B and Zr are compositely added; a high-cleanliness smelting control technology, an electroslag remelting technology and a composite ply rolling technology are adopted, a two-stage rolling process, a transverse-longitudinal rolling process and a heat treatment process of quenching, two-phase region quenching and critical temperature tempering are matched, and the finally obtained wide and thin steel plate has excellent comprehensive mechanical properties.

The invention discloses a steel plate floor support plate and an implementation method, and aims at solving the problems that a traditional floor support plate is insufficient in rigidity and strength, large in steel consumption, complex in construction, low in material utilization rate and the like. The floor support plate comprises a wide upper flange (the minimum width is larger than or equal to 30 mm), a wave-shaped reinforcing steel bar web member, a lower chord reinforcing steel bar and a profiling thin-bottom steel plate, the wide upper flange is of a combined type or thin steel plate type or trapezoidal steel pipe structure, and a side plate forming an inclination angle with a vertical shaft enhances the out-of-plane stability; the inclination angles of the steel bar web members are consistent with those of longitudinal ribs (trapezoidal ribs, closed inverted triangular ribs and the like) of the upper flange side plates and the profiled thin-bottom steel plates, so that line-surface contact welding is realized; the profiled thin-bottom steel plate is provided with longitudinal ribs and transverse ribs, so that the overall rigidity is improved; the lower chord steel bar adopts a double-layer design to strengthen node stress. According to the implementation method, industrial production is achieved through cold roll forming, automatic resistance welding and other processes. A traditional triangular truss is optimized into a trapezoid and four-side box type space structure, the bending rigidity is remarkably improved (the inertia distance between the upper flange and the profiling thin bottom steel plate is increased by 40% or above), the steel consumption is reduced by about 30%, the connection reliability is enhanced, meanwhile, the concrete consumption is reduced, the construction process is simplified, and the structure is suitable for various building scenes such as large span and heavy load.

The invention belongs to the technical field of cutting equipment, and particularly relates to a diaphragm plate cutting device for steel box girder manufacturing, which comprises a base, a conveying mechanism, an automatic cutting mechanism, two groups of extrusion limiting mechanisms, a plate thickness feedback mechanism, a plate cutting in-place feedback mechanism, a pre-cutting starting mechanism and a cutting feeding speed follow-up regulation and control mechanism. The device can automatically transfer the steel plate to be cut to continuously produce a plurality of diaphragm plates, can judge the residual cutting space of the steel plate according to the width of the diaphragm plate to be cut and feed back a signal, and can also automatically regulate and control the extrusion limiting force according to the thickness of the steel plate to avoid deformation and residual stress of the thin steel plate; and meanwhile, whether pre-cutting is conducted or not can be determined according to the thickness and hardness of the steel plate to prevent cutting cracking and roughness, and the feeding speed can be automatically adjusted based on the cutting resistance of the disc cutter to prevent overload damage of the cutter.

The invention relates to the field of buildings, and discloses a prefabricated pipe pile stand column steel supporting node and a construction method thereof.The prefabricated pipe pile stand column steel supporting node comprises a prefabricated pipe pile stand column, a pile head is arranged at the top of the prefabricated pipe pile stand column, a micro-expansion concrete filling core is arranged in the prefabricated pipe pile stand column, and the bottom end of the micro-expansion concrete filling core is fixedly connected with a round thin steel plate through anchor bars; the top ends of the anchor bars are fixedly connected with anchor plates, overflow holes are formed in the anchor plates, and the top faces of the anchor plates are exposed out of the pile head. Longitudinal steel reinforcement frameworks and transverse stirrups are arranged in the pile head to form a steel reinforcement mesh cage, a micro-expansion concrete filling core is poured by adopting a layered pouring and layered vibrating process, and end hook type steel fibers are doped, so that concrete shrinkage can be compensated, cracks are inhibited, and meanwhile, the bending strength and the shearing strength of the pile head are enhanced; and the load of the steel support can be uniformly transmitted to the prefabricated tubular pile stand column through the anchor plate, so that the node has reliable bearing capacity and crack resistance.

The curvature-adjustable semi-automatic cutting machine track is composed of a plurality of tracks, each track comprises a radian adjusting mechanism, a first thin steel plate and a second thin steel plate, the first thin steel plates and the second thin steel plates are connected through a plurality of connecting beams, and the top edges of the first thin steel plates and the top edges of the second thin steel plates are advancing tracks of wheels of a semi-automatic cutting trolley. The first thin steel plate is perpendicularly and rigidly fixed to the connecting beams, and the second thin steel plate is perpendicularly and rigidly fixed to the connecting beams at the two ends of the length direction of the second thin steel plate and movably connected with the other connecting beams. The radian adjusting mechanism is used for adjusting the distance between the ends, connected with the second thin steel plate, of the connecting beams so as to adjust the curvature. The track is light and handy in structure, good in portability, capable of meeting cutting of small-curvature sector-shaped steel plates and meeting the blanking and cutting requirements of different specifications of super-large-diameter sector-shaped steel plates, wide in application range, large in curvature adjusting range and suitable for linear types with the minimum radius ranging from 4 meters to infinity.

The invention discloses a method for rapidly detecting chemical components in a thin steel plate below 2mm by using a direct-reading spectrometer, belongs to the technical field of physical and chemical detection, and aims to solve the problem that a sample with the thickness of less than 2mm in the national standard GB / T 4336-2016 cannot be directly analyzed by using spark discharge atomic emission spectrometry. The method comprises the following operation steps: confirming conditions such as a sample preparation mode, a sample spectrum excitation limit thickness, influence of sample flatness and use of a special sample clamp, optimizing working conditions of an instrument, and establishing a method for measuring 13 elements such as C, Si, Mn, P, S, Cr, Ni, Cu, Al, Nb, V, Ti and N in a carbon steel and low alloy steel sheet with the thickness not less than 0.20 mm through spark discharge atomic emission spectrometry. And verifying the precision and accuracy of the determination result of each element, and comparing the results to show that the determination result of each element is consistent with the standard GB / T 4336-2016. The method does not need to decompose a sample, and has the characteristics of accurate and rapid determination and good stability.

The invention discloses a production method of a thin steel plate for a nuclear containment vessel. The steel plate comprises the following chemical components in percentage by mass: less than or equal to 0.20% of C, 0.40-0.50% of Si, 0.75-1.50% of Mn, less than or equal to 0.030% of P, less than or equal to 0.010% of S, less than or equal to 0.003% of Nb and less than or equal to 0.003% of V. Ti < = 0.003%; alt is greater than or equal to 0.30%; alt / N is greater than or equal to 4, and the balance is Fe and inevitable impurities. The production method comprises the procedures of smelting and rolling. The smelting process adopts an LF + VD external refining process; a single-phase region high-temperature fast rolling process is adopted in the rolling procedure. The produced thin steel plate for the nuclear containment vessel with the thickness of 5-10 mm meets the requirement for low yield strength, the low-temperature toughness at the temperature of-40 DEG C is good, the normal-temperature tensile ReH is 300-330 MPa, Rm is larger than or equal to 450 MPa, and A is larger than or equal to 40%; the transverse impact energy at-40 DEG C is greater than or equal to 100J.

The utility model discloses a suspender connecting structure, particularly discloses a suspender connecting structure for a bailey piece steel girder suspension bridge, and belongs to the technical field of design and construction of bridge engineering structures. The suspender connecting structure for the bailey piece steel main beam suspension bridge is relatively simple in structure, and the connecting part is firmly fixed. The suspender connecting structure comprises a cross beam, suspenders and double-row bailey piece combination beams, the two double-row bailey piece combination beams are connected through the cross beam to form a suspension bridge deck, the suspender connecting structure further comprises a pin joint connecting mechanism, and upper chords of the double-row bailey piece combination beams are hinged to the lower ends of the suspenders at the corresponding positions through the pin joint connecting mechanism.

The invention discloses 900MPa-grade hot-rolled high-strength structural steel for a CSP production line. The 900MPa-grade hot-rolled high-strength structural steel comprises the following chemical components in percentage by weight: 0.050-0.069% of C, less than or equal to 0.20% of Si, 1.50-1.70% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.15-0.20% of Ti, 0.18-0.55% of Cr, 0.02-0.08% of V, 0.03-0.06% of Alt, 0.001-0.004% of Ca, less than or equal to 0.004% of N and the balance of Fe. And 18 < = (Ti + V) * 104 < = 25. The low-cost alloy component design is adopted, the optimized steelmaking and hot rolling procedures are combined, the strength and plasticity of the hot-rolled structural steel can be effectively improved, and low-cost production of a thin steel plate strip with the tensile strength larger than or equal to 900 MPa is achieved; and after-treatment processes such as cold rolling or heat treatment for regulating performance are not needed, so that the production process can be greatly shortened, procedures are saved, and the method is suitable for popularization and application.

The present invention relates to a method for manufacturing a stator for an axial gap-type motor, which can minimize core loss due to eddy current by configuring split teeth using a multi-stage laminated core formed by stacking multiple sub-laminated cores having different shapes. According to the present invention, the method for manufacturing a stator comprises the steps of: preparing multiple sub-laminated cores having different shapes by primarily stacking multiple thin steel pieces for each type; preparing multiple divided teeth by secondarily stacking the multiple sub-laminated cores; forming a waterproof coating film on an exposed flat surface of a shoe of the multiple divided teeth, the waterproof coating film being made of a film thinner than a waterproof partition wall; and forming, when injection molding a body case, a front end of each of the multiple divided teeth by an insert molding method to be embedded in the waterproof partition wall.

The invention relates to a battery carrier for an electric vehicle, comprising a battery tray (1) produced as a hot-formed and press-hardened component from a sheet steel blank, comprising a base (2) and side walls (3, 4) rising from the base (2) and having a flange (5) running around the top of the battery tray (1) and projecting outwards. A cooling channel structure (9) is formed in one piece and from a uniform material in the base (2), wherein a cover plate (12) is arranged on the base (2) in the battery tray (2) or wherein a cover plate (12) is arranged beneath the base (2) of the battery tray (1), such that cooling channels (13) are formed between the cooling channel structure (9) and the cover plate (12).

This invention discloses a method for fixing a seepage-proof transition section on an irregular rock slope in a mine landfill. A seepage-proof cementitious composite sprayed material is wet-sprayed onto the irregular rock slope (1-2), forming a seepage-proof cementitious composite sprayed material layer (2) on the surface of the seepage-proof transition section. A seepage-proof geomembrane (3) is laid from the regular rock slope (1-1), and then rubber pads (7) and thin steel plates (6) are laid on the geomembrane (3) from the inside out. Hollow grouting anchors (4) are self-drilled through the holes in the thin steel plates (6) and rubber pads (7), and the edges are trimmed with a seepage-proof sealing agent (8). This invention is applied to the reinforcement of seepage-proof transition sections on irregular rock slopes in mine landfills, overcoming the problem of easy damage during the fixing process of seepage-proof transition sections on irregular rock slopes, eliminating potential hazards, and improving the safety and reliability of the seepage-proof system. It not only has good economic benefits but also significant safety and environmental benefits.

The present application relates to the technical field of metallurgy, and particularly relates to a heat treatment production method of a thin-gauge series wear-resistant steel plate, which comprises the following steps: steel plate preparation, stacking and fastening, heating and quenching, disassembly and separation, tempering treatment and straightening treatment, wherein the stacking and fastening step is to stack the thinner steel plates as interlayer thin plates, the thicker steel plates as top cover plates and bottom cover plates, place the top cover plate on the top of the several interlayer thin plates stacked on the bottom cover plate, and fasten the top cover plate and the bottom cover plate. The present application effectively reduces the quenching residual stress of the steel plate, improves the plate shape control ability and the plate shape quality, and realizes excellent control of the plate shape of the thin-gauge wear-resistant steel by heating and quenching the stacked and fastened multi-layer thin-gauge steel plate. Meanwhile, the present application realizes the production of wear-resistant steel plates with different hardness levels using the same component in combination with different quenching cooling speeds. After tempering, the steel plate is quickly straightened using the residual heat, and the produced thin-gauge series wear-resistant steel plate has high flatness.

The utility model discloses a skylight sunshade curtain which comprises a sunshade curtain handle and sliding blocks installed at the two ends of the sunshade curtain handle. The cross section of the sunshade curtain handle is of a double-hole structure, one side edge of the sheet steel is folded and bent inwards to form a large hole, and the other side edge of the sheet steel is folded and bent inwards to form a small hole. Correspondingly, the sliding block comprises a sliding block body, a small inserting part and a large inserting part, wherein the small inserting part and the large inserting part are arranged at the end of the sliding block body side by side. The small inserting part is clamped in a small hole of the sunshade curtain handle, and the large inserting part is clamped in a large hole of the sunshade curtain handle. The double-hole sunshade curtain handle can adapt to a narrower space layout, materials are reduced, and cost is reduced; the sunshade curtain handle is combined with the sliding block, installation is convenient, the anti-torsion capacity is higher, connecting pieces are matched through elastic clamping connection characteristics, it can be guaranteed that the structure of the whole system is more stable due to high and low temperature changes or when the whole system passes through a bumpy road, and the clamping force between the sunshade curtain handle and the sliding block can effectively eliminate the risks of vibration and abnormal sound.

The utility model discloses an edge cutting device for stainless steel plate machining, and relates to the technical field of steel plate machining, the edge cutting device comprises two bottom plates, a cutter, a knife switch, a supporting mechanism, a sliding mechanism and a locking mechanism, the cutter is welded on the upper surfaces of the bottom plates, the rear end face of the cutter is rotatably connected with the knife switch, and the supporting mechanism is connected with the sliding mechanism. According to the steel sheet cutting device, supporting of a steel sheet is achieved through the supporting mechanism, the stability in the cutting process is improved, the U-shaped clamping plate is arranged on the outer side of the bottom end of the cutter in a sleeving mode, one end of the U-shaped clamping plate is attached to the cutter through rotation of the clamping rod, the stable clamping effect is achieved, and meanwhile the clamping rod is fixed to the outer side of the U-shaped clamping plate. The L-shaped laying plate is arranged on the front end face of the U-shaped clamping plate and used for effectively supporting the thin steel plate, the thin steel plate to be cut can be stably supported by the L-shaped laying plate, the thin steel plate is prevented from drooping or shaking in the cutting process, it is guaranteed that the thin steel plate is stably placed, and the cutting precision is further improved.

This invention provides a highly economical nesting drainage pipe by forming connecting sections between pipe bodies without creating enlarged diameter sections. [Solution] This is a nesting drain pipe 1 in which, among a plurality of pipes of different diameters, one pipe 20 can be inserted into the outer pipe 10 which has a larger diameter. When the inner pipe 20 extends, the tip of the outer pipe 10 at the connecting portion that contacts and connects with the outer pipe 10 is reduced in diameter, and a protrusion 22a provided on the outer circumference of the base end 22 of the inner pipe 20 engages with the reduced diameter portion 13a, thereby forming the connecting portion without expanding the base end 22. Each of the plurality of pipes 10 and 20 is provided with a water collection hole 25 along its entire length. The protrusion 22a is formed from a protruding material such as a thin steel plate, screw, rivet, pin, dowel, or weld bead, or from a wound material such as wire, tape, or pipe, or by crushing the edge of the base end of the pipe.

The invention relates to a metal mold extrusion imbedding method, which is specially used for an imbedding casting which cannot be used for imbedding a large-proportion insert in gravity casting, and comprises the following steps of: fixing all inserts on an insert assembly which is made of a thin steel plate, can be put into a metal mold, has a casting appearance, is provided with an opening at the upper end and is used for isolating molten steel from directly contacting with the metal mold; the method comprises the following steps: putting an insert assembly into a furnace, heating to 600-1000 DEG C, putting into a metal mold, closing and locking the mold, quantitatively pouring molten steel at an upper end opening, starting a press, carrying out closed extrusion on the molten steel by an upper mold, enabling the molten steel to enter a small space between inserts, and wetting the surfaces of the inserts at a certain temperature under pressure to form metallurgical bonding.

The invention belongs to the technical field of metal material surface treatment, and discloses a production process of a weldable electroplated chromium plate. According to the process, cluster-shaped peak morphology is transferred on the surface of a cold-rolled steel coil through a laser texturing roller, and staged double-layer chromium electroplating is combined, specifically, a discontinuous chromium layer is formed on the top of a micro convex peak through first-time high-current pulse electroplating, and local iron leakage points are reserved; the second low current direct current plating covers an ultrathin continuous chromium film to maintain macro passivation. According to the invention, a composite functional structure with both macroscopic passivation integrity and microcosmic conductive selectivity is constructed on the surface of chromium-plated iron by accurately controlling the microstructure of the surface of a base material and double-layer chromium plating process parameters, so that the technical bottleneck of the chromium-plated plate in resistance welding application is effectively solved, collaborative optimization of weldability and corrosion resistance is realized, and the application range of the chromium-plated plate in resistance welding is widened. And a reliable technical path is provided for comprehensive replacement of chromium-plated iron in the field of metal packaging.

The present invention relates to the technical field of ship heterogeneous material connection, and discloses a ship composite sandwich panel connection mechanism supported by an I-beam, comprising a steel connection mechanism, a composite sandwich panel structure, an I-beam, ceramic wool and a thin steel plate. The steel connection structure is arranged at a full-gear or half-gear strong frame, with the composite sandwich panels connected on the left and right sides, the I-beam connected at the bottom, and ceramic wool and a thin steel plate connected on the outside to improve the fire protection level. The present invention adopts a pre-embedded and welded method to connect the composite sandwich panel and the steel structure, and optimizes the shear stress at the traditional connection interface to be the main stress and stress concentration to surface contact and line contact, which significantly reduces the stress concentration degree and improves the safety of the overall structure. It solves the problems of low load transfer efficiency, poor deformation coordination, insufficient connection strength, etc. existing in conventional connection technologies, and is suitable for connection scenarios where composite sandwich panels and steel structures have high connection strength requirements.

This invention relates to a novel shear wall, and more particularly to a prestressed self-centering steel plate-concrete composite shear wall, belonging to the field of structural engineering technology. This shear wall consists of a surface steel plate, internal concrete, thermal insulation materials, double-steel-tube concrete columns, connecting angle steel, square tie rods, anchorages, and prestressing tendons. The surface steel plate is made of thin steel; the internal thermal insulation materials are materials such as rock wool; the double-steel-tube concrete columns have round steel tubes inside and square steel tubes outside; the prestressing tendons are unbonded post-tensioned prestressing tendons. The prestressed self-centering steel plate-concrete composite shear wall provided by this invention is a novel lateral force resisting component for high-rise structures or other structures. It features light weight, good seismic performance, and high ductility, making it an excellent lateral force resisting component.

Provided is a tailor-welded blank which can be manufactured with high productivity and at low cost even when a thin steel sheet is used as a raw material, and which has excellent press workability. The butt joint part is provided with a stirring part and a hot working influencing part adjacent to the stirring part, the stirring part is provided with an upper stirring part and a lower stirring part adjacent to each other in the thickness direction, and on the basis, the relationship of the following formulae (1)-(3) is satisfied. Pj > = 0.9 * PbmL (1) TszL > = 0.9 * TbmL (2) TszH < = 1.1 * TbmH (3).

The invention relates to a method for evaluating the corrosion resistance of a formed plated thin steel plate, which comprises the following steps of: performing a drawing test on a disc-shaped sample of the formed plated thin steel plate to form a cup-shaped sample; calculating a deformation factor of the cup-shaped sample after the drawing test; cleaning, drying and weighing the cup-shaped sample subjected to the drawing test for the first time; performing a neutral salt spray test on the cup-shaped sample cleaned for the first time; cleaning, drying and weighing the cup-shaped sample subjected to the neutral salt spray test for the second time; respectively calculating the weight variation of the N cup-shaped samples after the first cleaning and the second cleaning, and calculating the average weight loss of the N samples; and comparing the average weight loss of different types of formed coating thin steel plate samples with the same coating thickness under the same deformation factor or the average weight loss of the same formed coating thin steel plate sample under different deformation factors, and when the average weight loss of the sample is smaller, the corrosion resistance of the formed coating thin steel plate under the same condition is stronger.

The present invention relates to the technical field of hot-rolled high-strength steel production, specifically a high-strength and toughness, low-yield ratio thin steel plate for concrete mixer trucks and its manufacturing method. The steel plate comprises the following chemical components by weight: C: 0.10% to 0.15%, Si: 0.60% to 0.90%, Mn: 0.80% to 1.00%, P ≤ 0.015%, S ≤ 0.005%, Al: 0.25% to 0.29%, Cr: 0.40% to 0.60%, N ≤ 0.0040%, H ≤ 0.00020%, Nb: 0.008% to 0.030%, with the remainder being Fe and unavoidable impurities. Production costs are significantly reduced, and the product exhibits excellent performance, including high tensile strength, low yield ratio, good plasticity and toughness, high wear resistance, good fracture resistance, good formability, and low-temperature impact toughness. It can be a low-cost, comprehensive replacement for existing concrete mixer truck tank and blade manufacturing materials.

This invention discloses a method for controlling the edge waviness problem at the head of wide, thin steel plates, relating to the field of steel plate processing quality control technology. The specific steps include obtaining a preset value Fb for the bending roll force. 预 Determine Fb 预 Rolling length L acting on the head of the steel plate 头 Before the steel plate is bitten in during the finishing rolling stage, follow Fb 预 A bending force is applied to create a negative convexity in the transverse loaded roll gap of the rolls; rolling begins when the head of the steel plate bites in, continuing until the rolling length reaches L. 头 Then, restore the bending roll force to its initial value and continue subsequent steel plate rolling. Using the method of this invention, the problem of edge waviness at the head of wide, thin steel plates can be effectively controlled, enabling the straightness of the steel plate head to reach 1.2mm / 1000mm.

The utility model discloses a detection sensor positioning mechanism for low strain detection of a pile foundation, which is characterized in that the periphery of the bottom of a positioning cylinder is provided with a boss, the lower surface of one side of the boss is provided with a first groove, one end of the upper surface of the boss, which is far away from the first groove, is provided with a shaft rod, and one end of a thin steel plate is provided with an L-shaped extension section; the L-shaped extending section is movably arranged in the first groove of the boss through a bolt, a cylindrical handle is arranged on the upper surface of the end, away from the bolt, of the thin steel plate, one end of the limiting buckle is rotationally connected with the shaft rod, a clamping groove is formed in the other end of the limiting buckle, and the limiting buckle is matched with the cylindrical handle through the clamping groove. The sensor for low-strain detection is inserted into the positioning cylinder, after the head of the sensor is coated with the adhesive, the sensor and the boss are pressed on the pile top of the pile foundation together, the stability of the sensor is greatly improved through cooperation of the positioning cylinder and the boss, the sensor can be perpendicular to the surface of the pile top as much as possible, and therefore the precision of detection data is improved.

The invention belongs to the technical field of steel plate cutting, and particularly relates to steel plate cutting equipment for steel machining, which comprises a machining platform, the upper end of the machining platform is fixedly connected with a placing table and a guide track plate, the guide track plate is located above the placing table, and a plasma welding gun is arranged below the guide track plate; and the pressing and fixing mechanism is used for pressing the upper end of the steel plate before cutting so as to prevent the steel plate from deviating during cutting, the pressing and fixing mechanism comprises a fixing plate fixedly connected to the lower end of the guide rail plate, and the lower end of the fixing plate is rotationally connected with two threaded rods. On the basis of hierarchical control of hydraulic pressure (through automatic pressure release valves with different threshold values), self-adaptive speed regulation of'thin-fast thick-slow 'is achieved, when a steel plate is thin, a plurality of moving rods stretch out, the cutting speed is increased, and plasma arc burning through caused by overheating is avoided; when the steel plate is thick, only a small number of moving rods stretch out, the cutting speed is reduced, and the plasma arc fully melts metal.

The invention relates to a 9Ni steel plate for ship LNG storage tank with high strength and low yield ratio. According to the mass percentage, the chemical constituents are C: 0.02-0.05%, Si: 0.10-0.30%, Mn: 0.50-0.80%, Ni: 8.90-9.50%, P: ≤0.0070%, s: ≤0.0020%, Cr: 0.10-0.25%, Alt: 0.010-0.035%, Nb: 0.010-0.020%, Ca: 0.0005-0.0030%, O: ≤0.0012%, N: ≤0.004%, H: ≤0.00015%, and the balance is Fe and unavoidable impurity elements. The production process flow is: smelting in a converter or electric furnace→RH vacuum degassing→LF refining→RH high vacuum degassing→Ca Treatment→continuous casting→slab slow cooling treatment→slab surface cleaning→heating→rolling→quenching→tempering. For the 9Ni steel, especially the 9Ni thin steel plate, the invention adopts the constituents design of low C, 9% Ni, addition of Nb and Cr. The steel plate is subject to high-temperature hot rolling, and then QLT heat treatment process to obtain 9Ni steel with good strength, toughness and low yield ratio.

A battery carrier for an electric vehicle having a battery tray produced as a hot-formed and press-hardened component from a sheet steel plate, having a floor and side walls rising from the floor with a flange encircling the top of the battery tray and projecting outwards. A cooling channel structure is formed integrally in the floor and made from one material, wherein a cover plate is arranged on the floor in the battery tray or a cover plate is arranged underneath the floor of the battery tray in such a way that cooling channels are formed between the cooling channel structure and the cover plate.

The utility model provides a numerical control machine tool isolation door, which relates to the technical field of numerical control machine tools, and comprises a linear module, a spliced isolation door, a mounting cavity and an anti-puncture protection plate, a linear module is adopted to drive a spliced isolation door replacing a sliding block of the linear module, the spliced isolation door is shielded in front of a feeding window of an outer protective cover of the numerical control machine tool, and the linear module drives the spliced isolation door to transversely move to control whether the feeding window of the outer protective cover of the numerical control machine tool is shielded or not. And the installation cavities in the upper side and the lower side of the splicing type isolation door are filled with the anti-puncture protection plates, splashing crushing cutters are blocked through the anti-puncture protection plates, the better anti-puncture effect is achieved compared with a thin steel plate, and the safety of machine tool operators is protected.