786 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 invention discloses a hot-rolled steel plate cutting device, which belongs to the technical field of hot-rolled steel plate processing. The hot-rolled steel plate cutting device comprises a main body, a base is fixedly connected to the bottom of the main body, a transmission mechanism is installed inside the main body, a cutting box is fixedly connected to the top of the middle end of the main body, a plurality of distance control mechanisms are installed on the top of the inner wall of the cutting box, an adjustment mechanism is installed on one side of the plurality of distance control mechanisms, and a cutting mechanism is installed on the bottom of the inner wall of the cutting box. The present invention designs a transmission mechanism, a distance control mechanism, an adjustment mechanism and a cutting mechanism, so that when the hot-rolled steel plate cutting device is working, it can be selected according to the size of the steel plate, and multiple sizes can be selected at the same time, and the cutting angle can be selected according to the concave and convex caused by the hot and cold changes of the steel plate processing, thereby ensuring the cutting quality of the steel plate.

The invention discloses a method for preventing a high-carbon tool steel hot rolled steel coil from being flattened, which comprises the following steps of: providing a continuous casting slab which comprises the following components in percentage by mass: 0.65 to 1.35 weight percent of C, 0 to 1.6 weight percent of Si, 0 to 1.2 weight percent of Mn, 0 to 1.2 weight percent of Cr, less than or equal to 0.030 weight percent of P, less than or equal to 0.030 weight percent of S and the balance of iron and inevitable impurities; the charging temperature of the continuous casting sheet billet is larger than or equal to 300 DEG C, the continuous casting sheet billet is fed into a heating furnace to be heated, the discharging temperature of the continuous casting sheet billet is 1150-1250 DEG C, and a first sheet billet is obtained; the first plate blank is subjected to rough rolling, the rough rolling and finish rolling temperature ranges from 1050 DEG C to 1150 DEG C, and an intermediate blank is obtained; the intermediate billet is subjected to finish rolling, the finish rolling temperature of finish rolling is 800-950 DEG C, and finish rolled steel is obtained; laminar cooling is conducted on the finish-rolled steel in a front-section centralized cooling mode, final fine adjustment water and front and rear side spraying of laminar cooling are closed, the temperature of the finish-rolled steel is reduced to the first target temperature to the phase transformation point, and cooled steel is obtained; and the cooled steel is coiled at the temperature of 590-690 DEG C, the coiling tension is increased by 10%-20% in the coiling process, and a hot rolled steel coil of the high-carbon tool steel is obtained.

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 relates to a hot-rolled wire rod for a 2400 MPa bridge cable and a manufacturing method of the hot-rolled wire rod, after high-carbon components of Cr-Mo-V are rolled and spun into a wire rod, the wire rod is subjected to online molten salt rapid cooling isothermal treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state to form a structure taking sorbite as a main part, and precipitation and growth of carbides are controlled; and finally, roller way slow cooling is conducted, the hot-rolled wire rod with the microscopic structure comprising a mixed structure composed of tempered sorbite, ferrite and fused pearlite is prepared, the strength and plasticity matching performance of the wire rod can be improved, the mechanical property fluctuation can be reduced, the tensile strength can reach 1640-1680 MPa, the percentage reduction of area can reach 27%-32%, the mechanical property same-circle difference is smaller than or equal to 45 MPa, and the tensile strength of the wire rod can reach 1640-1680 MPa, the percentage reduction of area can reach 27%-32%, and the mechanical property same-circle difference is smaller than or equal to 45 MPa. And rapid and stable production is facilitated, the method is used for manufacturing the 2400 MPa bridge cable, and the wire breaking risk can be reduced easily.

The invention belongs to the technical field of steel production, and relates to a method for improving the accuracy of final rolling temperature prediction based on a deep learning algorithm. According to the method, multiple key data, such as finish rolling inlet temperature, rolling force, cooling water flow and rolling speed, influencing the finish rolling temperature of hot rolled strip steel are selected through correlation analysis, and a generalized regression neural network (COA-GRNN) optimized by a raccoon optimization algorithm is utilized to establish a finish rolling temperature prediction model. The model realizes remote monitoring of the finish rolling temperature, so that production personnel can predict the trend of the finish rolling temperature in advance and adjust the finish rolling temperature in time, thereby ensuring the quality stability of strip steel and the yield of production.

The utility model discloses an anti-warping mechanism for cutting a hot rolled steel strip, which belongs to the technical field of steel processing and comprises a support frame, through grooves are arranged on two sides above the support frame, a support plate A is mounted in the support frame through a servo electric cylinder A, and a cutting mechanism with an anti-warping function is arranged in the support frame. Through the cutting mechanism, in the cutting process, a conveying roller B and a limiting roller B are used for clamping and fixing one side of a steel belt, a conveying roller A and a limiting roller A are used for clamping and fixing the other side of the steel belt, the situation that the edge of the steel belt is warped in the cutting process, and the cutting effect is affected is avoided, and a pressing plate always presses the cutting position of the steel belt under the action of a spring telescopic rod; the pressing plate moves along with the laser cutting head, the friction force between the pressing plate and the steel belt is reduced through the balls, the pressing plate flattens the edge of a notch of the steel belt, the steel belt can enter the other through groove smoothly in the follow-up process, and the cutting effect is better.

The invention provides a medical TA4G pure titanium wire bar and a preparation method thereof. According to the preparation method of the medical TA4G pure titanium wire bar, firstly, alloy raw materials are subjected to vacuum consumable smelting, a first alloy ingot is obtained, and then cogging forging is conducted; carrying out multidirectional forging and water quenching treatment on the blank; then the blank is subjected to precise radial forging; and finally, after multi-pass small-deformation hot rolling is conducted on the blank, cold rolling is conducted, annealing is conducted after cold rolling, and the medical TA4G pure titanium wire bar is obtained. According to the method, the oxygen content is limited, and the medical low-oxygen high-performance TA4G pure titanium wire bar is finally obtained through the processes of repeated vacuum consumable smelting, cogging forging, multidirectional forging water quenching treatment, multi-pass small-deformation hot rolling, cold rolling and annealing. The invention also provides the medical TA4G pure titanium wire bar prepared by the method provided by the invention.

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 hot rolled steel heating furnace flue gas heat exchange heating desulfurization and denitrification system which comprises a rolled steel heating furnace, a fuel gas heating furnace, a coal side flue gas purification device and an air side flue gas purification device, and the coal side flue gas purification device comprises a coal side smoke discharge pipe, a first preprocessor, a first heater and a first denitrator. The first denitrator is communicated with an inlet of the first preheating assembly, and an outlet of the first preheating assembly is sequentially connected with a first pipeline mixer, a first desulfurizer, a first bag-type dust collector and a first chimney; the air side flue gas purification device comprises an air side smoke exhaust pipe, a second preprocessor, a second heater and a second denitrator, the second denitrator is communicated with an inlet of a second preheating assembly, and an outlet of the second preheating assembly is sequentially connected with a second pipeline mixer, a second desulfurizer, a second bag-type dust collector and a second chimney. According to the system, the flue gas denitration and desulfurization effects are remarkably improved, and the safety and the stability of a denitration and desulfurization process route are improved.

The invention discloses high-temperature-resistant high-carbon alloy spring steel and a manufacturing method of a hot-rolled coil plate of the high-temperature-resistant high-carbon alloy spring steel. The high-temperature-resistant high-carbon alloy spring steel comprises, by weight, 0.58%-0.66% of C, 1.60%-2.00% of Si, 0.60%-0.90% of Mn, 0.015%-0.060% of Al, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.30%-0.50% of Cr, 0.15%-0.25% of Ni, 0.02%-0.05% of Nb, smaller than or equal to 0.080% of Cu and the balance Fe and inevitable impurities. The manufacturing method of the high-temperature-resistant high-carbon alloy spring steel hot-rolled coil plate comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH refining, slab continuous casting, slab hot rolling, heat treatment and the like. A high-temperature-resistant spring made of the high-temperature-resistant high-carbon alloy spring steel hot-rolled coil plate has the characteristics of high purity, high precision, high-temperature resistance, high yield point, high elastic limit, excellent toughness, fatigue resistance, corrosion resistance and hardenability, meets the use requirements of users on high-temperature-resistant spring steel, can completely replace imported springs, and has wide application prospects. And the technical blank in the field in China is filled.

The present application relates to the technical field of hot-rolled strip thickness, and discloses a monitoring method and device for a hot-rolled thickness control model, the method comprising: obtaining a self-learning coefficient calculated and generated by a self-learning module in the hot-rolled thickness control model during multiple hot-rolling processes to obtain a first monitoring parameter array; judging whether there are J1 consecutive values ​​in the first monitoring parameter array whose absolute values ​​all exceed a set limit value, wherein J1 is a natural number greater than 2; if there are J1 consecutive values ​​in the first monitoring parameter array whose absolute values ​​all exceed a set limit value, then outputting alarm information about the hot-rolled thickness control model. The technical solution provided by the present application monitors whether there is a problem with the hot-rolled thickness control model through the self-learning coefficient generated by the self-learning module in the hot-rolled thickness control model, and can timely adjust the hot-rolled thickness control model, thereby improving the thickness control accuracy of the hot-rolled thickness control model in the hot-rolling process of the rolled piece.

The invention discloses hot rolled steel for a 500MPa-grade high-ductility hollow anchor rod welded pipe as well as a preparation method and application of the hot rolled steel, and belongs to the technical field of hot continuous rolling plate strip production. The hot rolled steel for the 500MPa-grade high-ductility hollow anchor rod welded pipe is prepared through smelting, casting blank heating, rough rolling, coiling of a hot coiling box, finish rolling, laminar cooling and coiling. The yield strength is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 600 MPa, the percentage elongation after fracture is larger than or equal to 26%, and the maximum force percentage elongation is larger than or equal to 14%. The hot rolled steel is subjected to the machining procedures of heating of a high-frequency electric heating device, three-roller spinning equal-diameter rolling, online heat treatment, saw cutting and slow cooling of a cooling bed, and a hollow anchor rod body is obtained; the yield force is larger than or equal to 150 kN, the tensile resistance is larger than or equal to 200 kN, and the maximum force elongation is larger than or equal to 6%. The method can effectively solve the problem that the ductility of the hollow anchor rod body prepared after heat treatment is poor due to the fact that existing anchor rod steel cannot have strength and ductility at the same time.

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 discloses a flux-cored wire with high crack resistance and wear resistance and a preparation method of the flux-cored wire. The flux-cored wire comprises the following flux-cored raw materials in percentage by mass: 6-10% of electrolytic manganese; 28 to 34% of metal chromium; 0.5 to 1.5 percent of ferrotitanium; 1-4% of tungsten powder; 5-9% of nickel powder; 4-8% of 45 # ferrosilicon; 8 to 12% of colloidal graphene; 8-12% of molybdenum powder; and the balance of iron powder. According to the flux-cored wire, C, W, Cr, Mo and other elements are added into the flux core, the proportion of flux core powder is reasonably adjusted, and the flux-cored wire is suitable for surfacing continuous casting rollers, hot rolling rollers, shafts with the working temperature lower than 510 DEG C and sealing faces of medium-temperature and high-pressure stop valves and has the advantages of being high in heap melting speed, good in weldability, high in surface abrasion resistance, low in cost and the like. The hardness value of the steel plate can basically reach 50 HRC, and the steel plate has good crack resistance.

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 invention discloses a hot-rolled strip steel coiling temperature control method and related equipment, and relates to the technical field of hot rolling. The method comprises the steps that temperature data of strip steel in the width direction is obtained; performing normalization and polynomial fitting on the temperature data, and calculating a central point temperature value of the strip steel width; and on the basis of the central point temperature value, the opening and closing state of a cooling area valve is adjusted so as to control the coiling temperature of the strip steel. The actual temperature condition of the strip steel can be reflected more accurately, and the problem that a traditional point type pyrometer is prone to being affected by plate shape and surface problems to cause distortion is effectively solved, so that the mechanical property and the structure property of the strip steel are improved, and the product quality is guaranteed.

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.

A hot rolled steel sheet having a composition comprising of the following elements, 0.03% ≤ Carbon ≤ 0.07 %,0.8 % ≤ Manganese ≤ 1.3%, 0.01% ≤ Aluminum ≤ 0.07 %, 0.01% ≤ Niobium ≤ 0.07%, 0.05 % ≤ Titanium ≤ 0.15%, 0.0005% ≤ Calcium ≤ 0.005%, 0% ≤ Phosphorus ≤ 0.03 %, 0 % ≤ Sulfur ≤ 0.015 %, 0 % ≤ Nitrogen ≤ 0.02%, 0.001% ≤ Silicon ≤ 0.09%, 0% ≤ Chromium ≤ 0.2%, 0.03% ≤ Copper ≤ 0.25%, 0% ≤ Nickel ≤ 0.2%, 0% ≤ Molybdenum ≤ 0.2%, 0% ≤ Vanadium ≤ 0.1%, 0 % ≤ Boron ≤ 0.003%, 0 % ≤ Magnesium ≤ 0.010%, 0% ≤ Cerium≤ 0.1%, 0% ≤ Zirconium ≤ 0.010%,,the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 40% to 75% Bainite, 25% to 60% Ferrite, Pearlite from 0% to 2% and Martensite-Residual Islands from 0% to 2% wherein the said hot rolled steel sheet has an inclusion density of 200 inclusions per square micro-meter, the inclusions having a size of 2 microns or more being 15% or less of the total number of inclusions.

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 discloses galvanized dual-phase steel with different yield strength levels and 780 MPa tensile strength levels and a manufacturing method of the galvanized dual-phase steel. The method comprises the following steps: providing a continuous casting sheet billet comprising the following components in percentage by mass: 0.06%-0.09% of C, 0.10%-0.25% of Si, 1.9%-2.3% of Mn, 0.40%-0.70% of Als, 0.01%-0.025% of Nb, 0.22%-0.30% of Cr, 0.15%-0.20% of Mo, less than or equal to 0.015% of P, less than or equal to 0.025% of S, less than or equal to 0.005% of N and the balance of Fe; carrying out hot rolling treatment on the continuous casting sheet billet to obtain a hot rolled steel coil; pickling the hot rolled steel coil to obtain a pickled steel coil; performing cold rolling on the pickled steel coil to obtain a cold hard coil; and annealing and galvanizing the cold hard coil to obtain the galvanized steel sheet.

The invention discloses a corner-crack-resistant Q235B carbon structural steel hot-rolled steel strip and a production method thereof.According to the production method, on the basis of medium-carbon and low-manganese carbon steel Q235B in the prior art, chemical components of the medium-carbon and low-manganese carbon steel Q235B are optimized, and the corner-crack-resistant Q235B carbon structural steel hot-rolled steel strip is obtained in combination with the optimized casting blank heating process, rolling process and coiling process. According to the method, the casting blank corner crack phenomenon does not occur in the production process, and the product corner crack resistance target 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 discloses a production method of a non-oriented silicon steel hot rolled plate. The production method comprises the following steps: preparing a continuous casting billet through steelmaking and continuous casting; the obtained continuous casting billet is annealed, the annealing temperature ranges from 600 DEG C to 700 DEG C, and the annealing time ranges from 10 hours to 30 hours; the annealed continuous casting billet is heated, the soaking temperature ranges from 1050 DEG C to 1250 DEG C, and the soaking time ranges from 180 min to 220 min; the heated continuous casting billet is roughly rolled into an intermediate billet with the thickness of 40-45 mm, finish rolling and coiling are conducted, and a hot rolled plate is obtained; wherein the finish rolling temperature of rough rolling is 950-1000 DEG C, the finish rolling temperature of finish rolling is 820-880 DEG C, and the coiling temperature is 600-680 DEG C. Abnormal growth of ferrite columnar crystals caused by internal stress in the continuous casting billet can be avoided, and the defect of sawtooth-shaped edge cracks of the hot-rolled plate is overcome.