371results about "Work cooling devices" patented technology

The invention belongs to the technical field of aluminum alloy production, and particularly discloses a low-carbon environment-friendly method for producing a 3104 alloy blank with a high secondary aluminum proportion, which comprises the procedures of smelting, melt purification, online degassing filtration, continuous casting and triple continuous rolling, and is characterized in that alloy components are optimized, secondary aluminum waste is used in a large proportion, the Fe content is increased, and the production cost is reduced. Iron and elements such as manganese in the aluminum alloy form intermetallic compounds, the intermetallic compounds can serve as heterogeneous nucleation, obviously refine alloy grains during casting and increase Fe content, the performance of the 3104 alloy blank is improved, meanwhile, aluminum is replaced with iron, the main material cost can be reduced, in addition, due to the fact that the rolling temperature of an inlet of each rack is high, and meanwhile the finish rolling temperature is also high, the service life of the 3104 alloy blank is prolonged. The self-tempering effect is achieved, internal dislocation of materials is eliminated, the blank edge cracking condition is improved, strip breakage caused by the edge cracking problem in the subsequent rolling process is avoided, safe production is guaranteed, the main material cost is reduced, meanwhile, the blank performance is improved, the 3104 alloy blank is efficiently produced in a high-quality mode, and the purposes of low carbon and environment protection are achieved.

The present application relates to a kind of large thickness submarine pipeline steel plate and its production method, by the optimization design steel plate component of low-carbon low-alloy component, production method is with the special controlled rolling process of five-stage heating+recrystallization zone low temperature large reduction rolling+intermediate billet instant cooling+non-recrystallization zone high temperature large reduction rolling, and the multi-stage controlled cooling process of high temperature zone air cooling redistribution+ferrite zone cooling+waiting temperature+bainite zone cooling+air cooling self tempering cooling.The product steel plate of the present application has higher acicular ferrite proportion, and the average grain size of ferrite is finer, 3~6 μm, so that the steel plate has good strength and toughness match, the steel plate has higher strength, yield strength ≥500MPa, tensile strength ≥630MPa, and impact energy KV2 At-60 ℃, ≥250J.

The invention discloses a hot continuous rolling preparation method of a single-sided stainless steel composite plate, which comprises the following steps of: milling and grinding one surface of each of two base materials according to a relative shape complementation mode; the surface is machined into an irregular concave-convex surface comprising n planes which are sequentially connected in the transverse direction or the longitudinal direction, the base material is a non-uniform-thickness blank with the thickness non-monotonically changing in the transverse direction or the longitudinal direction, and n is larger than or equal to 2; assembling according to the stacking sequence of the base material, the composite material, the composite material and the base material to prepare a composite blank; the composite blank is heated at the temperature of 1210-1270 DEG C, then hot continuous rolling is conducted, rolling is conducted for 1-3 passes at the temperature of 1180-1240 DEG C, and the rolling reduction is larger than or equal to 30 mm; rolling is conducted for 3-5 passes at the temperature of 1050-1170 DEG C, and the rolling reduction is larger than or equal to 28 mm; the initial rolling temperature is larger than or equal to 950 DEG C, the finish rolling temperature is larger than or equal to 850 DEG C, then cooling is conducted, and coiling is conducted at 560-660 DEG C; and flattening the obtained composite coil, and then carrying out stack cooling between two steel plates with the temperature of Tf-Tf + 150 DEG C.

The invention relates to the technical field of steel rolling, and discloses a Q355B steel hot rolling process optimization method based on dynamic temperature control, which comprises the following steps: blank pretreatment, dynamic heating control, high-pressure water descaling, rough rolling process, finish rolling process, laminar cooling and coiling process. According to the method, a collaborative system of multi-section variable-temperature heating and intelligent temperature control is constructed, temperature distribution in a furnace and the heating rate are monitored and dynamically adjusted in real time, it is guaranteed that the core surface temperature of a plate blank is uniform and consistent, thermal stress and the internal crack tendency in the heating process are eliminated, and a high-temperature blank uniform in structure and stable in performance is provided for follow-up rolling; meanwhile, the high-pressure water descaling system optimizes jet flow parameters and introduces chemical additives, so that a protective layer is formed while oxide scales on the surface are removed, the surface cleanliness and quality of the plate blank are improved, and product defects caused by incomplete descaling and surface damage are avoided.

The invention relates to the field of equipment control, in particular to a water tank penetrating air source self-adaptive adjusting method and system. The method comprises the following steps: acquiring a finishing mill start-stop signal and a wire rod head position signal in real time; dynamically calculating the residual distance from the head of the wire rod to the penetrating water tank, and generating a dynamic delay opening threshold value; the electromagnetic valve is controlled to open the pneumatic ball valve in a sectional manner; monitoring the covering length of the wire rod and converting the covering length into an equivalent gas resistance value; a dynamic pressure compensation amount is generated through a pressure closed-loop controller; the opening degree of the pneumatic ball valve is adjusted accordingly; when the finishing mill stops, the pneumatic ball valve is triggered to be closed, and a gradient pressure relief turn-off program is executed if necessary. By means of the distributed sensor array and the multi-mode recognition neural network, real-time accurate monitoring and analysis of the operation state of the pump set are achieved, dependence of post personnel is reduced, and the automation degree and stability are improved. And by dynamically optimizing the control strategy, the pump set system operates efficiently, energy waste is reduced, the energy utilization efficiency is improved, and the production cost is reduced.

The invention discloses a novel process for realizing online softening and improving cold heading performance of SCM435 series cold heading steel, and relates to the technical field of cold heading steel processing. The invention discloses a novel process for realizing online softening and improving the cold heading performance of SCM435 series cold heading steel. According to the method, S1, steel billet continuous casting forming, S2, steel billet precise heating, S3, low-temperature rolling molding, S4, wire rod standard spinning, S5, stelmor cooling and S6, heat preservation vestibule slow cooling are carried out, the uniformity of the process performance is remarkably improved, by innovatively optimizing the spinning coefficient and the roller way speed, it is fundamentally guaranteed that the disc shape is neat, the heat dissipation conditions of all positions of the wire rod in a slow cooling vestibule are consistent, and the heat dissipation efficiency of the wire rod is improved. Therefore, uniform transformation of a whole-roll structure and a same-circle structure is achieved, the consistency of cold heading performance is greatly improved, the cracking risk in the cold heading process is effectively reduced, the technology is remarkable in energy-saving and consumption-reducing effect, rolling waste heat is fully utilized for on-line softening, the traditional off-line reheating and annealing procedure is completely omitted, and energy consumption can be saved by about 30% or above.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The application discloses a preparation method of a rail with low residual stress and corrosion resistance, and comprises the following steps: S1, cooling the steel rail after rolling; S2, adopting light pressing down to straighten the steel rail after the cooling for the first time; S3, heating the rail bottom of the steel rail after the first time of straightening; and S4, using multiple pairs of straightening rollers to straighten the steel rail after the heating for the second time, wherein each pair of straightening rollers symmetrically straightens the rail head and the rail bottom. The application can reduce the residual stress of the rail bottom and improve the corrosion resistance of the rail.

The invention discloses a process for improving a longitudinal shearing camber of QSTE650TM girder steel. The process comprises the steps of plate blank preparation, rolling and cooling, straightening treatment and longitudinal shearing machining. In the slab preparation step, the length of a slab is shortened to 8.5-9 m; in the rolling and cooling step, a plate blank is subjected to rough rolling and finish rolling firstly, and strip steel obtained after finish rolling is cooled; in the cooling process, air cooling is firstly carried out to 880-900 DEG C, then laminar cooling is carried out, the laminar cooling rate is 20-25 DEG C / s, and the final cooling temperature is 550-580 DEG C; the straightening treatment step comprises a rough straightening process and a fine straightening process; in the rough straightening process, the pressure of a rough straightening machine is 18-20 MPa; in the fine straightening process, the fine straightening insertion amount is controlled to be 30%-45% of the thickness of the strip steel, and the pressure of a fine straightening machine is 8-10 MPa; in the slitting processing step, the blade gap of a slitting machine is controlled to be 0.15-0.2 mm, and the winding tension is controlled to be 120-150N / mm. According to the method, the camber degree of the QSTE650TM girder steel after longitudinal shearing is systematically reduced, and the camber degree of the QSTE650TM girder steel is controlled within 3 mm.

The present application relates to copper plate strip processing technical field, provide a kind of advanced copper plate strip continuous rolling process, including S1.selecting the copper ingot of copper content above 99.9%, after sawing and surface polishing to obtain raw material;S2.copper ingot is heated in heating furnace, ensure the uniformity of copper ingot internal temperature;S3.using roughing mill to the copper ingot after heating is rolled through 2-3 passes roughing;S4.copper plate strip after roughing enters medium rolling mill, and medium rolling pass is 3-5 times;S5.copper plate strip after medium rolling enters finishing mill, and finishing pass is 3-4 times;S6.on-line cooling: copper plate strip after finishing immediately enters on-line cooling system.By early accurate sawing and polishing treatment, the initial quality of copper plate strip is guaranteed, the smooth progress of subsequent rolling process is ensured, the multi-pass continuous rolling process of roughing, medium rolling and finishing is combined with on-line cooling, through strict parameter control, not only improve production efficiency, but also effectively reduce energy consumption, reduce production cost.

The invention relates to the technical field of steel industry, and discloses a multi-specification self-adaptive temperature control rolling process in a bar rolling process, which comprises the following steps: S1, a blank pretreatment stage, S2, an intelligent heating stage, S3, a high-pressure water descaling stage, S4, a multi-pass rolling stage, S5, on-line size monitoring, S6, a post-rolling controlled cooling stage and S7, a finishing stage. The production change time is shortened, on the basis of a specification-temperature-roll gap correlation model, automatic matching of phi 20-100 mm full-specification parameters is achieved, the production change time is shortened to be within 15 minutes (reduced by 60% or above compared with a traditional process), automatic switching of equipment parameters such as an MES system correlation rolling plan, a water cooling box and descaling pressure is achieved, manual adjustment errors are avoided, the multi-specification production qualification rate is increased to 99.5%, and the production efficiency is improved. According to the scheme, the temperature control precision is improved, the product performance is optimized, the three-section temperature of the heating furnace is controlled through the fuzzy PID algorithm, and the bearing steel heating temperature equalization time is shortened by 30%.

The invention discloses a rolling process method for Q355C, D and E grade steel plates with the thickness of 100-150 mm. The rolling process method comprises the following steps that raw materials are prepared and smelted; the molten steel is transferred into an LF furnace for refining, lime and fluorite slagging materials are added, the refined molten steel is transferred into a VD furnace for vacuum degassing treatment, and the vacuum degree is smaller than or equal to 67 Pa; continuous casting: carrying out continuous casting or die casting on the molten steel subjected to vacuum degassing for pouring, and controlling the pouring temperature to be 1550-1560 DEG C; heating: feeding the casting blank into a heat accumulating type heating furnace for heating, and controlling the heating temperature to be 1200-1240 DEG C; the heated casting blank is subjected to normalizing rolling, and in the rolling process, high-pressure water is used for reducing the surface temperature of the steel blank; cooling, wherein the rolled steel plate is subjected to accelerated cooling, and the water entering temperature is 890-910 DEG C; and stack cooling is conducted, specifically, the rolled steel plate is subjected to stack cooling, and the stack cooling temperature is higher than 420 DEG C. The Z-direction performance of the developed steel plate reaches Z35 through reasonable component design and the normalizing rolling and NCP technology, and the steel plate has good obdurability matching and welding performance.

The invention belongs to the technical field of hot continuous rolling production lines, and particularly relates to a strip steel laminar cooling device. Comprising a foundation frame, a header assembly, a turnover mechanism and a plurality of switching assemblies. The header assembly comprises an overturning cross beam and a plurality of upper headers arranged side by side, and the overturning cross beam is parallel to the foundation cross beam and used for supporting the upper headers; the turnover mechanism comprises a linear driver and a crank arm, one end of the crank arm is connected to the turnover cross beam, and the other end of the crank arm is rotationally connected to the basic cross beam; each switching assembly is connected between the water inlet end of the corresponding upper collecting pipe and the water supply pipeline, the rotating part of each switching assembly is used for rotating along with overturning of the corresponding upper collecting pipe, and each switching assembly is connected to the foundation cross beam in a floating mode. According to the header assembly, the independent turnover mechanism is arranged to bear the turnover load of the whole header assembly, so that the switching assembly only bears the functions of fluid communication and follow-up rotation, harmful radial force generated due to the fact that a plurality of switching assemblies are installed in a non-coaxial mode is eliminated, the reliability of the switching assembly is improved, and the service life of the switching assembly is prolonged.

The embodiment of the invention relates to the field of hot-rolled strip steel production, in particular to a hot-rolled strip steel production control method and device, equipment and a storage medium, and according to the method, a finish rolling device is controlled to carry out finish rolling treatment on heated strip steel and then output the strip steel. And the laminar cooling device is controlled to convey the strip steel output by the finish rolling device to the coiling device. After a conveying mechanism of the laminar cooling device bites steel, whether the preset condition is triggered or not is detected in real time. And under the condition that the preset condition is triggered, the transmission mechanism is controlled to carry out accelerated transmission. Under the condition that the preset condition is triggered, the conveying mechanism can be controlled to conduct accelerated conveying, waste steel caused by arching of the head of the thin strip steel passing through the finish rolling outlet output roller way due to immediate acceleration after steel biting is avoided, and then the production process is safe, stable and smooth.

A reversing roughing mill for rough rolling an aluminium or aluminium alloy product fed along a feed plane, the roughing mill comprising: a reversing horizontal roughing stand 1; a first cooling device 10 arranged upstream of the reversing roughing stand 1 and configured to cool the product entering the reversing roughing stand 1 from above with a cooling liquid; and a second cooling device 15 arranged downstream of the reversing roughing stand 1 and configured to cool the product entering the reversing roughing stand 1 from above with the cooling liquid.

The invention relates to the technical field of metal material production, in particular to a 20CrMnTiH steel banded structure control method based on non-recrystallization zone rolling. The method comprises the following steps: heating a continuous casting steel billet in a soaking section at the temperature of 1,160-1,200 DEG C; after descaling, carrying out rolling at 1120-1180 DEG C, and carrying out rough rolling and intermediate rolling; the intermediate billet is subjected to water cooling before finish rolling, the outlet temperature of the intermediate billet is controlled to be 850-930 DEG C, and the intermediate billet enters an austenite non-recrystallization area; and then finish rolling is carried out, and the temperature on a cooling bed is controlled to be 900-950 DEG C. According to the method, through the synergistic effect of'segregation reduction at a high soaking temperature 'and'grain refinement through rolling in a non-recrystallization region', the technical contradiction between bainite inhibition and banded structure improvement is successfully solved. After the method is implemented, the average grade of the banded structure of the 20CrMnTiH steel can be reduced from 1.55 grade to 0.99 grade, and the maximum grade does not exceed 1.5 grade, so that the structure uniformity is obviously improved, the quenching deformation of subsequent heat treatment is reduced, and the requirements of high-end customers are met.

The invention relates to a plate shape control method in the rolling process of steel 30MnB5 for hot stamping forming. The plate shape control method in the rolling process comprises the working procedures of plate blank heating, rolling, cooling and coiling. In the cooling process, laminar cooling is used for cooling the strip steel to the coiling temperature, the cooling process is set as follows: cooling is performed in a sparse cooling mode, the cooling speed of the front section of laminar cooling is controlled to be 20-30 DEG C / S, the cooling speed of the rear section of laminar cooling is controlled to be 30-40 DEG C / S, and the total water amount of laminar cooling water spraying is set according to the ratio of the water amount of the front section to the water amount of the rear section of 1: 1.2-1: 1.4. The method is easy to implement, and the good strip shape control quality of the steel strip can be obtained through reasonable process design. And additional equipment and investment are not needed. By means of the method, the strip shape of the 30 MnB5 steel strip of the hot stamping forming steel of 5-10 mm is well controlled, the unevenness of the strip steel is not larger than 10 mm / m after the strip steel is flattened, and the wave shape judgment reduction amount and strip shape objection complaints caused by the poor strip shape are completely eradicated.

The present invention relates to a large-thickness submarine pipeline steel plate and a production method therefor. Steel plate components are designed by means of optimization of low-carbon low-alloy components, and the production method uses a matching special controlled rolling process of five-stage heating, low-temperature high-reduction rolling in a recrystallization region, instant cooling of intermediate slabs and high-temperature high-reduction rolling in a non-recrystallization region, and a matching multi-stage controlled cooling process of high-temperature region air cooling for redistribution, ferrite region cooling, temperature maintaining, bainite region cooling and air cooling self-tempering cooling. The steel plate product of the present invention has a relatively high proportion of acicular ferrite, and a relatively fine average ferrite grain size of 3-6μm, thus endowing the steel plate with good combination of strength and toughness. The steel plate has high strength, wherein the yield strength is ≥500MPa, the tensile strength is ≥630MPa, and the impact energy KV2 at -60℃ is ≥250J.

This disclosure relates to a rolling mill, specifically a cold rolling mill, comprising: - cylinders or sets of rollers including at least one pair of working cylinders capable of defining the air gap of a strip to be rolled, - at least one spray bar (3a, 3b) for spraying a lubricating and / or cooling fluid, located near the plane of the strip to be rolled, - a stand (2) within which said cylinders are arranged, - at least one device for adjusting the inclination of said at least one spray bar including an actuator, such as a hydraulic cylinder configured to change the inclination of the spray bar about the pivot axis. According to this disclosure, said actuator of the inclination adjustment device is arranged on the second side (C2) of the stand, opposite the first side (C1) of the maintenance window.

The application discloses a production method for controlling the thickness of iron oxide scale of free-cutting steel, and the process steps are as follows: hot metal pretreatment, converter steelmaking, CAS treatment, LF furnace external refining, continuous casting, heating furnace heating, rolling, controlled cooling, coil collecting and finished product inspection. The composition and thickness of the surface iron oxide scale of the free-cuting steel wire rod are controlled by controlling the wire drawing temperature and the post-rolling cooling speed, the wire drawing temperature is ensured to be below 860 DEG C by adjusting the water amount of the water tank after the finishing mill, the Fe2O3 red rust is generated on the surface of the wire rod, and the proportion of Fe3O4 in the iron oxide scale on the surface of the wire rod is prevented from being increased due to the excessively high wire drawing temperature. The wire drawing temperature and the post-rolling cooling speed are controlled in the application, the red rust-like iron oxide scale is formed on the surface of the free-cutting steel wire rod, the thickness of the iron oxide scale on the surface of the free-cutting steel wire rod is controlled to be below 12 microns, the inclusions and the banded structure are uniformly distributed, and the application is suitable for producing the free-cutting steel with the specifications of 6.5-17 mm and S=0.28%-0.40%.

Before a rolling pass (i), characterized by a parameter set (Λi), of a strip (100) in a roll stand (10), a minimum and maximum temperature (Tmin, Tmax) and a minimum and maximum coefficient of friction (µmin, µmax) are predefined and, from a setup model (200), limit values (Emin, Emax) for an emulsion actuator (21,..., 23') and setup values for the emulsion actuator (21,..., 23'), for a cooling actuator (41,..., 42') and for a lubricating actuator (31,..., 32') are predefined. During the rolling pass (i), the actuators are set to the setup values. An actual strip temperature (T') is identified by a temperature measuring device (51, 52), and an actual coefficient of friction (µ') is identified from measured manipulated-variable actual values (M'). These are taken as a basis to identify improved setup values either only for the cooling actuator (41,..., 42') and / or the lubricating actuator (31,..., 32'), or, if a change in the applied coolant rate or lubricant rate behaves synergistically with respect to the emulsion rate, additionally also for the emulsion actuator (21,..., 23'). The improved setup values are transferred from the setup model (200) to the parameter set (Λi).

This invention discloses a short-process bar rolling method and system. The method includes the following steps: S1, heating the billet in a heating furnace; S2, descaling with high-pressure water; S3, completing eight rolling passes in rolling zone one; S4, performing multiple-length segmentation with a first flying shear; S5, performing four rolling passes in rolling zone two; S6, performing multiple-length segmentation with a second flying shear; S7, performing diameter reduction rolling on the bar using a KOCKS mill; S8, a third flying shear; S9, water cooling; S10, cooling; S11, shearing the bar to length; S12, finishing and annealing; S13, magnetic flux leakage testing. This invention can meet the requirements for bar shape and size as well as the requirements for flaw detection, achieving integrated bar heating, controlled rolling and cooling, and flaw detection while saving space. This invention can reduce the number of traditional bar rolling passes, realizing short-process bar production with small space requirements, low power consumption, customization, greenness, and low carbon emissions.

The invention relates to the technical field of current collector preparation and discloses a high-energy-density power battery current collector preparation device and method.The high-energy-density power battery current collector preparation device comprises an operation table, a plurality of correction rollers arranged at the top of the operation table, a supporting frame fixedly connected to the two ends of the top of the operation table, and a power source, a material roller and a winding roller are arranged in the two supporting frames correspondingly, the top of the operation table is fixedly connected with a cooling box, a cooling assembly is arranged in the cooling box, and a uniformizing assembly is arranged in the cooling box; through cooperative use of the cooling assembly and the uniformizing assembly, when cooling liquid enters a second power disc, the cooling liquid drives a first rotating rod to rotate through rotating blades, the first rotating rod drives a sliding block to move through a transmission plate, and the sliding block drives a reciprocating gear to rotate through a reciprocating toothed plate; the reciprocating gear drives the spray pipe to rotate in a reciprocating mode through the reciprocating rod and the transmission mechanism, cooling liquid is sprayed out through the spray head for cooling, and therefore the uniform cooling effect is achieved.

The invention provides an adjustable laminar cooling device and system.The adjustable laminar cooling device comprises a pipeline mechanism and an adjusting mechanism, the pipeline mechanism is provided with a water spraying part, and the adjusting mechanism comprises a sliding rail, a transverse adjusting assembly, a vertical adjusting assembly and three adjusting units arranged at intervals in the transverse direction; each adjusting unit comprises a mandrel, an adjusting plate, two connecting blocks and a plurality of adjusting sets, and each adjusting set comprises a joint and a supporting rod. In this way, the width coverage range of cooling water can be adjusted through the transverse adjusting assemblies, the vertical adjusting assemblies are matched with the adjusting plates and the adjusting sets to adjust the distance between the water spraying parts so as to adapt to plates of different thicknesses and specifications, and when the heights of the vertical adjusting assemblies at the two ends are different, non-equidistant linear control can be achieved between the water spraying parts; and the flow of each water spraying part can be independently controlled so as to adapt to plate blanks of special specifications, the whole equipment is high in plate adaptability, and gradient control over the cooling density can be achieved according to the thickness difference of strip steel.

Provided are a high-strength thin-gauge checkered steel plate / strip comprising the following chemical elements in weight percentages: C: ≤0.06%, Si: ≤0.5%, Mn: 0.4-1.7%, P≤0.04%, S≤0.007%, N: 0.004-0.010%, Als: <0.001%, B: 0.001-0.006%, Mn / S≥250, total oxygen [O]T: 0.007-0.020%; Cu: 0.1-0.6% and / or Sn: 0.005-0.04%; and a balance of Fe and other unavoidable impurities, and a manufacturing method thereof. The resultant steel roll can be used directly as hot-rolled checkered plate / strip, or as a finished checkered plate / strip after being cut and finished, and is widely applicable to the fields of architecture, mechanical production, automobile, bridges, transportation, ship building, etc.

The present application relates to a stand housing (10) for a rolling mill stand (1) for rolling metallic bars, wires, or tubes along a rolling axis, wherein the stand housing (10) has an outer surface (12) with six side faces (14.1-14.6) which, viewed along the rolling axis, form edges of a regular hexagon, an inlet side, and an outlet side (13). At least one water inlet opening is arranged on three of the non-adjacent side faces (14.1, 14.3, 14.5), which is configured to direct water through the interior of the stand housing (10) to a water outlet opening (42.1, 42.2, 42.3) in the outlet side (13) or in the inlet side.

The application discloses a method for quickly determining the difference of cooling speed of a steel plate, comprising the following steps: S1. hot-rolling a steel plate blank, wherein the thickness of the steel plate blank is greater than or equal to 12 mm, preferably greater than or equal to 15 mm; S2. cooling the hot-rolled steel plate blank, wherein the cooling comprises laminar flow cooling; S3. performing real-time flatness detection on the cooled steel plate blank to obtain a flatness detection result of the cooled steel plate blank, wherein the flatness detection result comprises the plate shape of the cooled steel plate blank; and S4. determining the difference of cooling speed of the upper surface and the lower surface of the steel plate blank according to the flatness detection result after cooling. The method of the application solves the problem that the prior art can only be judged after sampling and performing organization performance analysis, has real-time performance, can quickly determine the difference of cooling speed of the steel plate, and can be adjusted in time in the production process; a large number of steel plate blanks can be found and saved in time, the efficiency is improved, and waste is reduced.

The application provides a preparation method of a hot-rolled strip steel of Cr-Mo steel material, the Cr-Mo steel material contains Cr: 0.80-1.10wt%, Mo: 0.15-0.25wt%, the laminar cooling process adopts U-shaped cooling, after the strip steel head passes through the last rack in the multi-rack finishing rolling process, the pinch roll cooling water, the coiling roll cooling water and the mandrel cooling water are closed, after the coiling mandrel is built for a period of time, the pinch roll cooling water and the coiling roll cooling water are opened, the multi-rack finishing rolling process is ended, after the strip steel is tail thrown from the last rack for a period of time, the pinch roll cooling water and the coiling roll cooling water are closed, the mandrel cooling water is opened after the strip steel is discharged from the coiling machine, vertical transportation is adopted after the coiling is unloaded, the steel coil after rolling is placed for slow cooling in the warehouse area, so that the mechanical property uniformity of the steel coil can be obviously improved, the performance stability is improved, the thickness fluctuation of the cold rolling process is reduced, and the flatness quality of the product is improved.

The application discloses a preparation method of a medium-high carbon steel hot-rolled coil and the medium-high carbon steel. The preparation method of the medium-high carbon steel hot-rolled coil comprises the following steps: slab continuous casting: medium-high carbon steel liquid steel is cast and drawn to obtain a slab, and a pre-descaling treatment is performed on the slab to reduce oxides on the surface of the slab, thereby obtaining a pretreated slab; slab heating: the pretreated slab is subjected to a heating treatment, and after the heating treatment, a high-pressure water descaling treatment is performed, thereby obtaining a to-be-processed slab; rolling: the to-be-processed slab is rolled to obtain a strip steel. According to the embodiment of the application, the slab after the slab continuous casting is subjected to the pre-descaling treatment before the slab is heated in a furnace, and after the heating treatment, the high-pressure water descaling treatment is performed before rolling, thereby removing the initial thick iron oxide scale on the surface of the slab and ensuring that the uniformity of the iron oxide scale formed on the surface of the slab during hot rolling is good.

This invention discloses a process for producing 65Mn steel through continuous casting and rolling of thin slabs, belonging to the field of steel production. The method includes the following steps: steelmaking, casting and rolling, and slow cooling. The steel composition is controlled as follows: C: 0.62%-0.70%, Si: 0.17%-0.37%, Mn: 0.90%-1.20%, P≤0.035%, S≤0.030%, Cr≤0.20%, Ni≤0.30%, Cu≤0.25%, with the balance being Fe and impurities. In the continuous casting process, the slab thickness is 90mm-110mm, the casting speed is controlled at 4.0m / min-4.8m / min, and the temperature difference of the slab cross-section is controlled at 40℃-65℃. In the finishing rolling process, the F3 work roll uses high-speed steel rolls, and the F4 and F5 work rolls use high-nickel-chromium rolls. The crown of the F3 work roll is set to be 200µm larger than that of other steel grades, and the load distribution of each stand follows a decreasing principle. Compared with existing technologies, this method improves the yield rate of straight hair curls.