568 results about "Hot rolled" patented technology

The invention relates to a hot-rolled wire rod for a 2060MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod. Mn-Cr high-carbon chemical component design and rolling spinning are performed to form a wire rod, then online molten salt isothermal phase change treatment is performed, the wire rod is firstly subjected to front-section molten salt treatment and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure, and then the wire rod is subjected to rear-section molten salt treatment, so that the hot-rolled wire rod is obtained. The method comprises the following steps of: firstly, carrying out heat treatment on the residual austenite, promoting the unconverted residual austenite to be converted into a sorbite structure, simultaneously promoting isothermal tempering of the structure and fusing of a part of sorbite lamellas, and finally, slowly cooling through a roller way to prepare a hot-rolled wire rod of which a microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, so that the material cost can be controlled; the high-strength and high-plasticity performance matching of the wire rod is improved, the tensile strength is 1370-1420 MPa, the percentage reduction of area is 35%-40%, and the mechanical property fluctuation is reduced, so that the wire breaking risk in stranded wire production is reduced, and efficient and stable production is promoted.

The present application relates to the field of metal material manufacturing, and in particular to a GH4151 alloy bar and a preparation method therefor and a use thereof. The method comprises the following steps: (1) carrying out homogenization heat treatment on a GH4151 alloy cast ingot to obtain a heat treated bar; (2) forging the heat treated bar to obtain a forged bar; (3) carrying out hot rolling treatment on the forged bar to obtain a hot rolled bar; (4) carrying out solution treatment on the hot rolled bar to obtain a solid solution bar; (5) carrying out cold drawing treatment on the solid solution bar to obtain a cold drawn bar; and (6) carrying out aging treatment on the cold drawn bar to obtain a GH4151 alloy bar. According to the GH4151 alloy bar prepared in the present application, grains can be effectively refined, the surface dimensional precision is improved, and the tensile strength of the prepared GH4151 alloy bar is improved, so that the GH4151 alloy bar has excellent mechanical properties.

The invention discloses a production method of 700MPa-grade high-strength weathering steel. The production method comprises the following steps: smelting and continuous casting production process flow: molten iron pretreatment, converter treatment, LF (ladle furnace) refining and machine casting; the components of the molten steel for the casting machine in percentage by mass are limited; according to the hot rolling production technological process, the casting blank tapping temperature is 1230 + / -20 DEG C, the finish rolling temperature of finish rolling is 890 + / -10 DEG C, the cooling speed is 10-20 DEG C / S, and the thickness of a hot rolled steel strip is 2.5-3.5 mm; laminar cooling equipment is adopted for cooling, a pre-dispersion cooling mode is adopted, and the coiling temperature is 640 + / -10 DEG C. A conventional C, S, i and Mn component system design is adopted, the content of corrosion-resistant alloy elements is properly reduced by adding corrosion-resistant elements Cu, Cr and Ni, the production cost is reduced, and meanwhile good performance is achieved.

The invention provides a hot rolled strip convexity prediction method based on weight distribution strategy hybrid modeling, and relates to the technical field of metallurgical machinery and automation. The method comprises the following steps: acquiring historical production data in the rolling process of a hot-rolled strip, and establishing a convexity mechanism model of the hot-rolled strip; an improved ant colony algorithm is adopted to optimize the extreme learning machine, and a hot rolled strip convexity data driving model is constructed; calculating the information entropy of the mechanical model and the information entropy of the data driving model by adopting an entropy weight method; according to the model information entropy, calculating an initial weight coefficient of a mechanical model and an initial weight coefficient of a data-driven model, and establishing a hybrid model through a weighted summation method; and in hot-rolled strip production of different rolling units, the weight is dynamically adjusted according to the deviation value between the predicted value and the actual value of the mechanism model and the data driving model, and a final hot-rolled strip convexity prediction result is output. By adopting the method, the accuracy of convexity prediction of the hot-rolled strip can be improved.

The invention discloses a preparation method of a vibration and noise reduction bimetal composite pipe, relates to the field of metal pipe processing, and aims to solve the problem of poor vibration and noise reduction performance of a traditional composite pipe. The preparation method comprises the steps that a composite pipe blank is provided and sequentially comprises a titanium alloy pipe and a stainless steel pipe from outside to inside, the titanium alloy pipe and the stainless steel pipe are fixed through a base, and an annular columnar filling cavity is defined by the titanium alloy pipe, the stainless steel pipe and the base; the filling cavity is filled with metal particle materials, the metal particle materials are compacted through a pressing block, and the open end of the filling cavity is sealed and welded through a cover plate; hot rolling is conducted on the composite pipe blank, and a first composite pipe blank sequentially comprising a titanium alloy layer, a porous metal layer and a stainless steel layer from outside to inside is obtained; and cutting off the pipe section of the base and the cover plate to obtain the composite pipe. And the porous metal layer formed by the metal particle material has good energy absorption performance and excellent sound insulation and heat insulation performance, so that the prepared bimetal composite pipe finally achieves the purposes of vibration and noise reduction.

A brazing-sheet manufacturing method includes superposing a core-material slab on or adjacent to at least one surface of a filler-material slab to form a clad slab, the core-material slab being composed of an aluminum material and the filler-material slab being composed of an Al—Si—Mg series alloy. Then, the clad slab is hot rolled to form a clad sheet having a core material layer composed of the aluminum material of the core-material slab and a filler material layer composed of the Al—Si—Mg series alloy of the filler-material slab. Then, the clad sheet is subjected to one or more passes of cold rolling. Either between cold-rolling passes or after the completion of the cold rolling, a surface of the clad sheet is etched using a liquid etchant that includes one or more inorganic acids. The liquid etchant does not contain fluorine atoms.

The invention relates to hot rolled plate thickness measuring equipment, and belongs to the technical field of detection equipment. The hot-rolled plate thickness measuring equipment comprises a control module and a plurality of detection mechanisms. Each detection mechanism comprises a radioactive source and a detection assembly. The detection assembly and the radioactive source are oppositely arranged in the thickness direction of the hot-rolled plate, and a gap for the hot-rolled plate to penetrate through is reserved between the detection assembly and the radioactive source. The detection mechanism is used for measuring the actual thickness size of the hot-rolled plate at the position; at least part of the multiple detection mechanisms can move in a reciprocating mode in the width direction of the hot rolled plate. And the control module controls the detection mechanism to stop or move in the width direction of the hot-rolled plate based on the variance of n actual thickness sizes of the hot-rolled plate continuously measured by the detection mechanism at the same position. The hot-rolled plate thickness measuring equipment provided by the invention can accurately measure the thickness dimension data of each part of the hot-rolled plate.

The invention discloses 750MPa-grade low-stress hot-rolled high-strength beam steel and a manufacturing method thereof, the method comprises the steps of smelting and continuous casting, casting blank slow cooling and soaking, rolling and segmented cooling, in the casting blank slow cooling and soaking step, the casting blank is cooled in air after red delivery, the furnace entering temperature is 300 DEG C or above, the soaking temperature is 1250-1290 DEG C, and the furnace staying time is 1-1.2 mm / min; in the rolling step, the initial rolling temperature of rough rolling ranges from 1100 DEG C to 1150 DEG C, the accumulated deformation of rough rolling is larger than or equal to 70%, the initial rolling temperature of finish rolling ranges from 950 DEG C to 1080 DEG C, and the final rolling temperature of finish rolling ranges from 810 DEG C to 880 DEG C; in the subsection cooling step, the first section is subjected to water cooling to 710-780 DEG C at the cooling speed of 10-25 DEG C / s and then is subjected to air cooling for 4-8 s, and then the second section is subjected to water cooling to the coiling temperature of 550-620 DEG C at the cooling speed of 30-50 DEG C / s. According to the low-stress hot-rolled high-strength large beam steel, the yield strength is larger than or equal to 700 MPa, the tensile strength is larger than or equal to 750 MPa, the ductility is larger than or equal to 20%, and the low-stress hot-rolled high-strength large beam steel not only has high strength, but also has good toughness and formability, and completely meets the requirements for use and performance of large beam steel in the industries of automobile manufacturing, engineering machinery and the like.

The invention relates to ultra-low carbon steel, a preparation method thereof and a steel product. The preparation method of the ultra-low carbon steel comprises the following steps: providing a casting blank; sequentially heating and hot-rolling the casting blank to obtain hot rolled steel; the hot rolling comprises rough rolling and finish rolling which are sequentially carried out, the initial rolling temperature of the rough rolling is 990-1040 DEG C, and the outlet temperature of the rough rolling is 900-940 DEG C; the initial rolling temperature of finish rolling ranges from 840 DEG C to 890 DEG C, and the final rolling temperature of finish rolling ranges from 750 DEG C to 830 DEG C; and the hot rolled steel is sequentially subjected to acid pickling, cold rolling and annealing. According to the preparation method, ferrite area low-temperature rolling is adopted, the heating energy consumption is remarkably reduced, the production efficiency is improved, the problem of scale thickening caused by traditional high-temperature rolling is avoided, the surface quality of the strip steel is more uniform, and the pickling cost is greatly reduced. Meanwhile, the ductility, the strain hardening index (n value) and the plastic strain ratio (r value) of the obtained finished product are remarkably improved, and the forming performance is excellent.

The embodiment of the invention discloses a coiling machine control method and related equipment, and relates to the technical field of smelting, the method comprises the following steps: when a rolling task changes, and the changed rolling task needs to call different coiling machines or the changed rolling task generates hot rolled strip steel with different sizes; obtaining a first distance between a finish rolling tail frame and a pinch roll of a second coiling machine, a second distance between the finish rolling tail frame and the head of the second strip steel, an output speed of the finish rolling tail frame, a third distance between the finish rolling tail frame and a pinch roll of a first coiling machine, a fourth distance between the finish rolling tail frame and the tail of the first strip steel and a coiling speed of the first coiling machine; calculating a first duration for the head of the second strip steel to reach the second coiling machine and a second duration for the tail of the first strip steel to enter the first coiling machine; judging whether a difference value between the first duration and the second duration meets a preset condition or not; and if the preset condition is not met, calculating target coiling data of the first coiling machine based on the preset condition to control the first coiling machine.

The manufacturing method comprises the following steps: rolling and spinning high-carbon and high-silicon components of Nb-Mo to form a wire rod, and then carrying out online molten salt strong isothermal toughening treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; and then carrying out rear-section molten salt treatment, reducing the circulation volume of molten salt, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out slow cooling through a roller way, so as to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, ferrite and fused sorbite, according to the invention, abnormal tissues can be inhibited, the tensile strength is 1566-1616 MPa, the percentage reduction of area is 33%-38%, and the production efficiency is considered, so that the ultrahigh-strength stranded wire can be produced without off-line heat treatment, and the risk of wire breakage is reduced.

The utility model discloses a device for preventing a super duplex stainless steel hot rolled plate coil from being broken, which comprises a cooling device in laminar cooling, the cooling device comprises a rack, the rack is sequentially provided with a cleaning mechanism, a spraying pipeline, a straightening mechanism, a blowing mechanism, a temperature measuring mechanism and a cooling mechanism, the cooling mechanism comprises an adjusting mechanism and a pair of spraying mechanisms, and the spraying mechanisms are arranged on the rack. According to actual use conditions, the cleaning mechanism, the spraying pipeline and the purging mechanism are also arranged below the rack and are symmetrical to the cleaning mechanism, the spraying pipeline and the purging mechanism which are arranged above the rack; a plurality of groups of spraying pipelines are uniformly arranged, and a plurality of groups of cooling mechanisms are uniformly arranged. By means of the cooling device, the stainless steel plate can be effectively and evenly cooled, precipitation of harmful phases in the cooled duplex stainless steel plate is reduced, and then the belt breakage rate of the duplex stainless steel plate is reduced.

The utility model discloses equipment for cleaning a spinning hot roller by using laser. The equipment comprises a moving trolley; the laser cleaning device is used for laser cleaning of the hot roller; and the assisting manipulator is arranged on the moving trolley and is used for carrying the laser cleaning device to the hot roller. Cleaning equipment can be rapidly moved to a cleaning station, an operator can also conveniently and rapidly enter the roller, operation is convenient, and the cleaning efficiency is greatly improved. In addition, the surface of the workpiece is irradiated by high-energy laser beams, so that dirt, rusty spots, coatings or residues on the surface are instantly evaporated after absorbing laser energy or generate expansion stress to be stripped under the impact of light waves, and therefore, attachments on the surface of a cleaned object are effectively removed at a high speed, and the purpose of cleaning is achieved.

The invention belongs to the technical field of pipeline steel production, and discloses a hot continuous rolling production method of Mo and Ni-free X70M pipeline steel, which comprises the processes of slab heating, rough rolling, finish rolling, laminar cooling and coiling, and the pipeline steel comprises the following chemical components in percentage by mass: 0.060 to 0.090 percent of C, 0.10 to 0.25 percent of Si, 1.50 to 1.70 percent of Mn, 0.20 to 0.30 percent of Cr, 0.045 to 0.070 percent of Nb, 0.020 to 0.050 percent of Al, less than or equal to 0.005 percent of S, less than or equal to 0.012 percent of P, 0.020 to 0.030 percent of Ti, less than or equal to 0.0050 percent of N and the balance of Fe and inevitable impurities. According to the pipeline steel, Mo and Ni are not added, the alloy cost is extremely low, meanwhile, a hot rolled steel strip of the pipeline steel has good low-temperature tearing resistance and low yield ratio, and the safety in the pipeline service process can be guaranteed.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2160MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod, after high-carbon components containing trace Nb are rolled and spun into a wire rod, the wire rod is subjected to online molten salt micro-quenching isothermal treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and enters a bainite phase region from an austenite state, part of the austenite is promoted to be converted into bainite, and then the high-strength complex-phase hot-rolled wire rod is obtained. The method comprises the following steps: carrying out high-temperature tempering on the residual austenite, carrying out post-section molten salt treatment, increasing the molten salt temperature, promoting the unconverted residual austenite to be decomposed and converted into sorbite, carrying out isothermal tempering, and finally carrying out roller way slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered bainite, ferrite and tempered sorbite, so that network carbides and martensite structures can be inhibited, and the tensile strength of the hot-rolled wire rod is improved. And the structure type and toughness are regulated and controlled on line, the tensile strength is 1472-1505MPa, the percentage reduction of area is 31%-36%, the work hardening rate and the production efficiency of the hot-rolled wire rod are improved, and the production energy consumption is reduced, so that a high-strength grade stranded wire is obtained.

Provided is a production process of an S355J2 hot rolled H-beam for a Ce-containing beam-column member, relating to the production of hot-rolled H-beams. The production process can ensure the performance of the hot-rolled H-beam with multiple classes from one steel grade, and achieve low cost, stability, uniformity, consistency, and narrow composition control of various elements. In the S355J2 hot-rolled H-beam for a Ce-containing beam-column member, a hot-rolled H-beam is prepared from the following compositions by mass fraction: 0.18%-0.20% of C, 0.25%-0.30% of Si, 1.22%-1.27% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.008%-0.011% of Nb, 0.008%-0.012% of V, 0.004%-0.008% of N, 0.0015%-0.0055% of Ce, less than or equal to 0.015% of Al, and the rest of Fe and inevitable impurities.

The invention relates to the technical field of high-strength steel hot roll bending forming processes, and provides a method, device and equipment for predicting hot bending forming springback based on simulation software. The method comprises the steps that a three-dimensional assembly model is constructed based on the geometric dimension of a roll forming machine; importing the three-dimensional assembly model into finite element software to simplify the three-dimensional assembly model; performing different types of grid division on different areas, and setting fixed boundary conditions and process parameters; pre-defining a temperature field for the bending area, and constructing a thermal-mechanical coupling constitutive model to obtain a temperature field simulation result; and establishing a simulation model by using a dynamic and static combined algorithm, and predicting the springback value. According to the method, finite element simulation is carried out on the bending process, the springback value is directly output through the node displacement difference, springback deformation is visualized through a post-processing tool, and high-precision prediction is achieved.

The invention relates to a hot-rolled wire rod for a 2300MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after high-Si and high-carbon components containing trace Nb are rolled and spun into a wire rod, the wire rod is subjected to online molten salt isothermal toughening treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; the method comprises the following steps: carrying out hot rolling on the austenite, carrying out post-section molten salt treatment, reducing the molten salt temperature and the molten salt circulation amount, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out roller way slow cooling to prepare a hot-rolled wire rod of which the microscopic structure comprises tempered sorbite, ferrite and fused sorbite. According to the invention, the cross-section shrinkage rate is 35%-40%, the mechanical property same-circle difference is less than or equal to 48MPa, and the material cost and the production efficiency are both considered, so that off-line heat treatment is not needed, and the efficient and stable production of the ultrahigh-strength stranded wire is promoted.

The invention relates to the technical field of data processing, and discloses a multi-element weather-resistant different board design method. The method comprises the following steps: carrying out trapezoidal section design processing on a geometric structure of a different plate according to an axial stress distribution rule to obtain equal-width variable-thickness pulling parameters, and carrying out stress matching calculation processing on the equal-width variable-thickness pulling parameters through a mechanical analysis algorithm to obtain thickness-stress corresponding relation data; and carrying out weather resistance fusion treatment on the multi-element formula system and the thickness-stress corresponding relation data to obtain a material component distribution scheme, and carrying out hot rolling forming optimization treatment on a different plate manufacturing process according to the material component distribution scheme to obtain multi-element weather-resistant different plate design parameters. The technical problems that in an existing steel plate design, a geometric structure is not matched with axial stress distribution, and a multi-element formula system is lack of stress feature fusion design are solved. And meanwhile, the technical problems that a variable-thickness special-shaped plate manufacturing process lacks systematic optimization, and accurate forming control over equal-width and unequal-thickness structures cannot be achieved are solved.

A high-magnetic-induction oriented silicon steel, comprising, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C≤0.005%, Si: 3.0-3.8%, Als: 0.010-0.035%, Mn: 0.05-0.20%, and at least one of Ce and La which satisfy: Ce+La: 0.003-0.3%, wherein among the inevitable impurity elements, N≤0.005%, S≤0.005%, V≤0.005%, and Ti≤0.005%. Also provided is a manufacturing method for the high-magnetic-induction oriented silicon steel. The annealing temperature of a hot rolled plate can be reduced, annealing of the hot rolled plate can be omitted, the thin-gauge high-magnetic-induction oriented silicon steel can be efficiently produced by means of a cold continuous rolling method, and the magnetic performance of a product is improved while the manufacturing cost is reduced.

The invention relates to a hot-rolled wire rod for a 2330MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after the wire rod is formed by rolling and spinning Cr-V high-carbon and high-silicon components, the wire rod is subjected to online molten salt isothermal toughening treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; the method comprises the following steps: carrying out hot rolling on austenite, carrying out post-stage molten salt treatment, increasing the temperature of molten salt, reducing the circulation volume of molten salt, promoting unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of part of sorbite lamellas, and finally carrying out roller way slow cooling to prepare a hot-rolled wire rod with a microstructure comprising a mixed structure consisting of tempered sorbite, ferrite and fused sorbite, the material cost can be controlled, the tensile strength is 1558-1608 MPa, the percentage reduction of area is 34%-39%, the production efficiency and the energy consumption are both considered, off-line heat treatment is not needed, and efficient and stable production of the ultra-high-strength stranded wire is met.

The invention provides a steel pipe whole-process intelligent tracking system based on multi-mode sensing fusion, and relates to the technical field of ferrous metallurgy intelligent manufacturing. The system comprises the following modules: a visual perception module, which is used for collecting the appearance characteristics, the spatial position and the motion state of a steel pipe in the whole process of steel pipe tracking; the one-by-one tracking and decision-making module is used for constructing a closed-loop work flow comprising data acquisition, fusion processing, decision-making output and feedback optimization by deeply fusing visual perception information and multi-source industrial signals; and the control interaction module is in two-way communication with the bottom PLC and an upper computer, receives equipment signals, feeds back the equipment signals to the tracking module, issues a tracking / alarming instruction to the PLC and synchronizes data to the MES. According to the method, the problems of blind areas, information chain scission and manual dependence of traditional tracking are solved, the whole process of the hot-rolled seamless steel pipes from a cooling bed area to material frame bundling through saw cutting segmentation is achieved, and one-by-one accurate tracking and quality control are achieved.

The utility model relates to the technical field of rollers, and particularly discloses a non-woven fabric hot roller which comprises a roller body and center shafts fixedly installed at the two ends of the roller body, the two sets of center shafts are provided with an oil inlet and an oil outlet respectively, the oil inlet and the oil outlet are communicated with the interior of the roller body, pressure relief pipes are arranged at the two ends of the roller body, and the pressure relief pipes are communicated with the interior of the roller body. A pressure relief valve is arranged on the pressure relief pipe, an oil collecting barrel is arranged at the end of the pressure relief pipe, an oil return pipe is arranged at the bottom of the oil collecting barrel, the end of the oil return pipe is communicated with the roller body, a miniature water pump is arranged on the oil return pipe, a pressure sensor is arranged in the roller body, a filter part is arranged on the oil return pipe, and a filter screen is arranged in the filter part. The non-woven fabric hot roll has the advantages that the non-woven fabric hot roll has pressure relief and oil return functions, equipment damage or production interruption caused by excessively high pressure of hot oil in the roll body can be effectively prevented, and the service life of the roll body can be prolonged.

Provided is a non-oriented electrical steel sheet that is excellent in iron loss and magnetic anisotropy under high magnetic flux and high frequency conditions, and a method for manufacturing the same. [Solution] A method for producing a grain-oriented electrical steel sheet includes the steps of heating a slab containing, by weight, 1.5 to 6.5% Si, 0.0005 to 3.5% Al, 0.01 to 3.0% Mn, 0.005 to 5.0% Cr, 0.0005 to 0.03% S, the balance being Fe and other unavoidable impurities, at 1050 to 1220°C, finish hot rolling the slab to obtain a hot-rolled sheet, hot-rolling the hot-rolled sheet at 850 to 1150°C for 30 to 300 seconds, cold-rolling the hot-rolled sheet that has been annealed to obtain a cold-rolled sheet, heating the cold-rolled sheet, and rolling the heated cold-rolled sheet. and final annealing at 600 to 1150°C for 10 to 300 seconds, wherein the cold rolling satisfies the following [Relationship 2], wherein the heating rate in the temperature range of 300 to 500°C during heating is 5 to 150°C / s, and the gas atmosphere in the temperature range of 500 to 750°C during the final annealing is composed of, by volume, 15 to 99.99% hydrogen, 0.0001 to 0.0030% oxygen, and the balance being an inert gas, and the oxygen content in the gas atmosphere in the temperature range of 800 to 1100°C during the final annealing is 1 to 1.5 times that in the temperature range of 500 to 750°C. [Relationship 2] Maximum temperature of cold-rolled sheet surface during cold rolling < 200 × cold rolling reduction / 100 + 40

The invention discloses a hot rolled steel surface defect detection method and device based on a double-stripe window pyramid network model, and the method comprises the steps: 1, collecting hot rolled steel surface defect images, constructing a defect image set, and carrying out the data enhancement processing of the images in the defect image set, and obtaining an enhanced defect data set; 2, CSPDarkNet53 is adopted as a backbone network, a DSwinTransform module is added to the rear end of the backbone network, meanwhile, an original Neck part is replaced with a BiFPN, and a multi-head context integrated attention mechanism module is added in front of a detection head so as to construct a double-stripe window pyramid network; step 3, inputting the enhanced defect data set into the trained DSWPN network, training based on a CIOU loss function until the loss function converges, and completing defect detection model training; and 4, collecting a hot rolled steel surface image in real time, and inputting the surface image into the trained DSWPN network to obtain a hot rolled steel surface defect detection result.

A method of manufacturing a stainless steel is provided. The stainless steel contains C, Si, Mn, P, S, Cr, Ni, and N in predetermined amounts. A total volume fraction of Cr-based carbides with a grain size of 2.0 μm or more is ≤10%. A steel slab is held at 1200° C.-1350° C. for at least 30 minutes and then hot rolled to obtain a hot-rolled steel sheet. The hot-rolled steel sheet is coiled, where at least three rolling passes with a finish temperature of ≥1050° C. and a rolling reduction of ≥20% are performed, and a coiling temperature of the hot-rolled steel sheet is ≥600° C. The hot-rolled steel sheet is subjected to hot-rolled sheet annealing to obtain a hot-rolled and annealed steel sheet, where a holding temperature is 750° C.-900° C. and a holding time is ≥10 minutes.

Method of manufacturing a steel strip comprising the steps of: - casting a molten steel into a slab; - reheating the slab at a temperature of 1150°C or more for a time of 1 hour or more; - hot rolling the steel into a strip, preferably using an average F1 slab entry temperature of more than 1000°C; - coiling the hot rolled steel strip; - batch annealing the steel strip: - at a temperature in the intercritical range (i.e. between Ac1 and Ac3), preferably less than 700°C; - in a non-oxidizing and non-nitrogenizing atmosphere; - for a total annealing time of at least 5 hours, preferably at least 10 hours so as to obtain: a Mn enrichment in austenite such that the Mn content is at least 1.25 times the overall Mn content of the steel; and a C enrichment such that the C content is at least 1.2 times the overall C content of the steel; - cooling the steel after batch annealing in air, forced air or water quenching.

The utility model relates to the field of demolding equipment, in particular to non-contact type automatic air knife efficient demolding equipment of a traction-free cold and hot roller press, which comprises a frame, a calendering component and an air compressor, the calendering assembly used for pressing and spreading the materials to be processed into the thin film with the certain thickness is installed in the frame, one side of the frame is communicated with the air compressor used for enabling the pressed film materials to fall off from the surface of the roller, one side of the air compressor is communicated with the airflow connecting pipe, and one end of the airflow connecting pipe is communicated with the flow dividing pipe. The two ends of the flow dividing pipe communicate with two sets of electromagnetic valves, the upper end and the lower end of each set of electromagnetic valve communicate with two sets of air injection pipes, and each set of air injection pipes communicate with air blades. And the pressed film material can quickly and stably fall off from the roller part.

The invention relates to a thick hot-rolled spring wide steel plate, and belongs to the field of iron-based alloys. The steel comprises the following chemical components in percentage by mass: 0.47 to 0.55 percent of C, 0.17 to 0.37 percent of Si, 0.70 to 1.10 percent of Mn, 0.90 to 1.20 percent of Cr, 0.10 to 0.25 percent of V, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S and the balance of Fe and inevitable impurities, and the structure is uniform ferrite and pearlite. The production thickness ranges from 41 mm to 55 mm, the width is larger than 2000 mm, and the length is not smaller than 6000 mm; the straightness is less than or equal to 3mm / m, and the thickness tolerance range is within 1mm. The hardness is smaller than 280 HBW, the inclusions A, B, C and D are all smaller than 1.5 grades, and the sum of the inclusions A, B, C and D is smaller than or equal to 3.0 grades and is larger than or equal to 2.0 grades. High purity, longitudinal and transverse performance uniformity and accurate thickness control of the large-size spring steel plate are achieved, the thickness machining amount of the steel plate is reduced by four times compared with that of a forging technology, the higher yield is achieved, and the production cost of large-size springs is greatly reduced.

Provided is a hot rolled steel sheet having a predetermined chemical composition and a microstructure comprising, by area ratio, pearlite: 90 to 100% and pro-eutectoid ferrite: 0 to 10%, wherein the pearlite has an average lamellar spacing of 0.08 to 0.30 μm, and the percentage of cementite in the pearlite having a major axis length of more than 0.3 μm and an aspect ratio of less than 3.0 is less than 15%.