233 results about "Hot rolled" patented technology

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 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 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.

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.

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%.

A hot rolled steel sheet having a composition comprising of the following elements,0.02 % ≤ Carbon ≤ 0.06 %, 1.1 % ≤ Manganese ≤ 1.60%,0.01% ≤ Aluminum ≤ 0.08 %, 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%,and can contain one or more of the following optional elements 0.001% ≤ Silicon ≤ 0.09%, 0% ≤ Chromium ≤ 0.2%, 0 ≤ Copper ≤ 0.25%, 0% ≤ Nickel ≤ 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, 35% to 75% Bainite, 25% to 65% ferrite, from 0% to 2% Pearlite and Martensite-Residual Islands from 0% to 2% wherein said hot rolled steel sheet has an inclusion density of 200 inclusions per square micro-meter, the inclusions having size of 2 microns or more being 25% or less of the total number of inclusions.

This application belongs to the field of target material production technology and discloses a method for preparing zirconium-yttrium alloy targets. First, zirconium is melted and cooled to obtain a zirconium ingot. Then, the zirconium ingot is flipped over and melted a second time. At the same time, metallic yttrium is added to the molten zirconium ingot to melt it to obtain a primary eutectic. Then, the primary eutectic is cooled to room temperature within 85 minutes to obtain a primary eutectic body. The primary eutectic body is then flipped over and melted a third time to obtain a secondary eutectic. Then, the primary eutectic is cooled to room temperature within 70 minutes to obtain a secondary eutectic body. Finally, the secondary eutectic body is machined, hot rolled, and hot isostatically pressed to obtain a zirconium-yttrium alloy target. This application improves the uniformity of zirconium and yttrium distribution by repeatedly flipping the zirconium ingot or eutectic body and remelting it. In addition, this application also discloses a zirconium-yttrium alloy target.

This invention provides a method for manufacturing oriented electromagnetic steel sheets that significantly improves manufacturability, and an apparatus for implementing the method. The method for manufacturing oriented electromagnetic steel sheets comprises the following series of steps: hot rolling a steel billet having a specified composition; hot-rolled sheet annealing; cold rolling once or twice with a total reduction rate of 80% or more from the thickness of the obtained hot-rolled sheet to the thickness of the cold-rolled product; recrystallization annealing; coating the steel sheet surface with an annealing separating agent; final product annealing; and planarization annealing for planarization. In this method for manufacturing oriented electromagnetic steel sheets, the grain boundary occupancy of recrystallized carbides in the hot-rolled sheet after annealing and before cold rolling is 80% or more, and the initial reduction during cold rolling is set to a strain rate of 200 / s or less, a reduction rate of 30% or less, and a steel sheet temperature of 90°C or less when biting into the rolls.

A hot rolled steel sheet having a composition comprising of the following elements 0.03% ≤ Carbon ≤ 0.070 %, 0.4 % ≤ Manganese ≤ 0.9%, 0.01% ≤ Aluminum ≤ 0.08 %, 0.01% ≤ Niobium ≤ 0.08%, 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.% ≤ 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, 35% to 70% Bainite, 30% to 60% Ferrite, Pearlite from 1% to 5% wherein the said hot rolled steel sheet has an inclusion density of 110 inclusions per square micro-meter and the inclusions having a size of 2 microns or more being 22% or less of the total number of inclusions.

The application discloses a process for improving corner crack of 16MnCr5 steel hot-rolled blank, which comprises the steps of slow cooling before heating, heating, blooming rolling and slow cooling after rolling; the slow cooling before heating step: the blank is first slowly cooled for more than or equal to 72 hours; the heating step: the segmented heating control is adopted, the heating temperature of the first heating section is 850-950 DEG C, the heating temperature of the second heating section is 1110-1150 DEG C, the temperature of the soaking section is 1100-1180 DEG C, and the total heating time is controlled to be 4-5 hours; the blooming rolling step: nine passes of rolling are adopted, the reduction of the first four passes is 50-60 mm, the reduction of the middle four passes is 20-30 mm, and the reduction of the last pass is 10-20 mm; the hot-rolled blank is obtained; and the slow cooling after rolling step: the hot-rolled blank is slowly cooled for more than or equal to 72 hours. The application reduces or eliminates the generation of surface cracks of the wire rod, guarantees good hardenability of the product, and effectively improves the product quality.

The invention concerns a method for producing a 6xxx series aluminium sheet comprising the steps of homogenizing an ingot made from a 6XXX series aluminium alloy; cooling the homogenized ingot with a cooling rate in a range of from 150° C. / h to 2000° C. / h directly to the hot rolling starting temperature; hot rolling the ingot to a hot rolling final thickness and coiling at the hot rolling final thickness with such conditions that at least 90% recrystallization is obtained while controlling the temperatures of hot rolling, in particular the relationship between the hot rolling starting temperature and the hot rolling exit temperature and / or controlling the grain size after coiling; cold rolling to obtain a cold rolled sheet.

Provided are aluminum 3xxx series alloy products having improved thermal and electrical stability, and methods for forming such products. Methods include DC casting a molten aluminum alloy, withdrawing the aluminum alloy from the mold to form an ingot, homogenizing the ingot at a homogenization temperature from 500 °C to 650 °C for a period of time from 1 to 5 hours. Methods include reducing the temperature to a soaking temperature from 350 °C to 550 °C and soaking the ingot for a period of time from 1 to 15 hours. Methods include hot rolling the homogenized ingot to produce a hot rolled aluminum alloy, and cold rolling the hot rolled aluminum alloy to produce to an aluminum alloy product.

A tempering-free wear-resistant hot rolled strip, includes components in percentage by weight: 0.08-0.22% of C, 0.1-0.55% of Si, 0.8-1.5% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.01-0.055% of Als, 0.005-0.019% of Ti, and less than or equal to 0.007% of N. A method for producing the same includes: desulfurizing molten iron, smelting desulfurized molten iron, and casting into a blank; heating the casting blank; performing rough rolling; performing finish rolling; performing rapid cooling; performing coiling; and performing conventional temper rolling. According to the present disclosure, on the premise that the tensile strength of a steel plate is greater than or equal to 1100 MPa and the elongation is greater than or equal to 12%, the steel plate has a surface Brinell hardness of 330-390 and a core hardness that is 95% or above of the surface hardness.

The utility model relates to the technical field of hot-rolled strip steel pickling, in particular to a hot-rolled strip steel pickling device which comprises a pickling tank, and an iron removal mechanism and a material clamping mechanism are arranged on the surface of the pickling tank. The fixing plate is fixedly connected to one side of the outer portion of the pickling tank, and the iron removing mechanism and the material clamping mechanism enable the upper grinding plate and the annular grinding plate in the descending state to clamp the hot-rolled strip steel to be pickled, and the two clamping plates in the moving state to be close to each other to clamp the end of the hot-rolled strip steel to be pickled. The two clamping plates in the axial moving state drag the clamped hot-rolled strip steel to be pickled, the upper polishing plate in the descending state is matched with the annular polishing plate in the rotatable state, and under dragging of the two clamping plates, friction polishing is conducted on a thick iron sheet on the surface of the hot-rolled strip steel to be pickled. Therefore, iron on the surface of the hot-rolled strip steel is polished once before the pickling process of the hot-rolled strip steel, pickling is performed after polishing is completed, and the pickling efficiency of the device on the hot-rolled strip steel is effectively improved.

The invention provides high-spheroidization-rate medium-carbon steel based on medium-low annealing temperature and a production method thereof.The method comprises the steps of a hot rolling process, specifically, a medium-carbon steel blank is subjected to hot continuous rolling, the hot rolling coiling temperature is controlled to be 650 + / -20 DEG C, and a lamellar pearlite structure is obtained; a cold rolling process: carrying out cold rolling on the hot rolled coil, controlling the total cold rolling reduction rate to be not less than 35%, and introducing high-density dislocation and distortion defects into a pearlite structure; the cold-rolled steel plate is placed in a cover annealing furnace, under the full hydrogen protection atmosphere, the cold point temperature in the furnace is controlled to be 700 + / -10 DEG C, the hot point temperature is 710 + / -10 DEG C, the heat preservation time is 4-8 hours, and the flaky cementite is fully spheroidized; according to the method, the spheroidization rate of the medium carbon steel reaches 90% or above successfully under the upper limit condition of the annealing temperature of 720 DEG C, the contradiction between insufficient equipment capacity and high-end product requirements is solved, and remarkable economic benefits are achieved.

Provided is a method for manufacturing an ultra high-strength and high-ductility steel sheet having an excellent yield ratio. The method includes: heating a slab in a temperature range of 1050 to 1300° C.; finish hot rolling the heated slab in a temperature range of 800° C. to 1000° C.; winding the hot-rolled steel sheet in a temperature range of 50° C. to 750° C.; cold rolling the wound hot-rolled steel sheet at a reduction rate of 15% or higher after pickling; and annealing the cold-rolled steel sheet in a temperature range of 600° C. to 720° C. for 10 sec to 3,600 sec, or annealing in a temperature range of higher than 720° C. and 900° C. or lower for 10 sec to 3,600 sec and cooling, followed by a second annealing in a temperature range of 480° C. to 700° C. for 10 sec to 3,600 sec.

Described herein is a method of manufacturing an aluminium alloy rolled product of a heat-treatable aluminium alloy, comprising: semi-continuous casting a heat-treatable aluminium alloy into a rolling ingot; homogenizing of the rolling ingot to a peak metal temperature (PMT) and whereby said aluminium alloy has a specific energy associated with a DSC signal less than 2J / g in absolute value; hot rolling of the rolling ingot in multiple hot rolling steps into a hot rolled product having a final rolling gauge of at least 1 mm, whereby the hot rolled product during at least one of the last three rolling steps has a temperature less than 50° C. below PMT; quenching of the hot rolled product at final rolling gauge from hot-mill exit temperature to below 175° C.; optionally stress relieving and ageing of the quenched and optionally stress relieved hot rolled product.

The invention relates to the technical field of metal materials, and particularly discloses light-weight high-toughness medium manganese steel and a preparation method and application thereof. The method comprises the following steps: firstly, pre-oxidizing a hot rolled plate in a specific low oxygen partial pressure atmosphere, and forming a compact Al2O3-MnO composite oxide layer which is well combined with a matrix on the surface in situ; and then, in multi-pass warm rolling, synchronous plastic deformation of the oxide layer and the base body can be achieved, and interface stripping is avoided. And finally, in the circulating annealing process, a surface oxide layer serves as a diffusion barrier to inhibit Mn element leakage and enrich the Mn element towards the core, so that the heterogeneous structure with the continuous gradient characteristic is successfully constructed, specifically, the surface layer is superfine martensite, the transition area is an austenite-ferrite double-phase structure, and the core is Mn-rich coarse grain austenite. The gradient tissue enables the material to have high strength, high wear resistance and high plasticity at the same time, and is suitable for medical instruments with comprehensive requirements for mechanical properties, light weight and biocompatibility, such as knee joint tractor fixing braces.

The invention relates to a device (1) and a method for convectively cooling hot steel products, in particular hot rolled products (5) in a rolling mill. The device (1) comprises at least one cooling bed which comprises at least one first and at least one second vertically extending cooling bed plane (2, 3), wherein the cooling bed planes (2, 3) are formed by at least one transport device which has at least one vertical conveyor means (4) that is designed to receive a rolled product (5) from a first horizontal conveyor means (6), raise the rolled product via a first vertical conveyor section, and deposit the rolled product on a second horizontal conveyor means (4) via a second vertical conveyor section. The circulating transport device is arranged in a substantially closed housing (7) which comprises means for producing a flow of air and / or gas, as a cooling medium, through the volume enclosed by the housing (7) and means for recovering energy from the air flow and / or gas flow which is guided through the housing and which is loaded with heat of the rolled product.

The utility model discloses a composite non-woven fabric hot rolling and laminating device, and relates to the technical field of composite non-woven fabric processing devices. The non-woven fabric hot rolling device comprises a workbench, and further comprises a hot rolling part which is installed above the workbench and used for carrying out hot rolling on non-woven fabric; the guide part is mounted at the top of the hot rolling part and is used for guiding the non-woven fabric; the preheating part is arranged above the guide part and is used for preheating the non-woven fabric; wherein the hot rolling part is used for conveying the non-woven fabric and carrying out hot rolling on the non-woven fabric, and during conveying, the guide part limits the non-woven fabric. The guide part is arranged, so that the problems that in the using process of an existing composite non-woven fabric hot-rolling film covering device, non-woven fabric is prone to transverse position deviation in the conveying process, so that the non-woven fabric is inconveniently and accurately compounded with a film, the film covering of a compounded product is prone to being uneven, and the product quality is poor are solved. The appearance and the quality of the product are influenced.

The invention provides a method and device for generating a temperature curve of hot rolled strip steel, and relates to the technical field of steel rolling, and the method comprises the steps: inputting a sampling time value into a trained target network model, and generating a predicted temperature value corresponding to the sampling time value through the processing of the target network model, the total loss function of the target network model comprises a physical loss function, a boundary condition loss function and a data loss function, and the target network model and the hot rolling process interval are in a corresponding relation; according to the mechanical property error, the target sampling number corresponding to the hot rolling process interval is determined; determining a target sampling time value and a corresponding target predicted temperature value from the sampling time value and the corresponding predicted temperature value according to the target sampling number; and the target sampling time value and the target prediction temperature value are processed to generate a hot rolling strip steel temperature curve, and therefore the accuracy and reliability of hot rolling strip steel temperature prediction are effectively improved.

The present invention relates to a hot rolled steel sheet having excellent formability for a multi-stage press process, and a method for manufacturing same.

Provided is a hot rolled steel sheet having a predetermined chemical composition, and a microstructure comprising, by area ratio, ferrite: 60 to 80%, bainite: 15 to 30%, and martensite: 3 to 10%, wherein TiC precipitates having a diameter of 1.0 to 5.0 nm are present in the ferrite in a number density of 1.0×1016 to 100.0×1016 / cm3, and the hot rolled steel sheet has a tensile strength of 780 MPa or more tensile strength.

The application discloses a kind of wire Morgan rolling mill supporting Danelli reducing sizing machine HRB400E steel kind control rolling and cooling method, comprising:1), heating furnace heating section temperature range 1120-1180 ℃, soaking section temperature range 1140-1160 ℃, in furnace time 80-90 minutes;2), opening rolling temperature is controlled according to 980±30 ℃;3), finishing rolling entrance temperature is controlled according to 860-900 ℃;4), reducing sizing machine entrance temperature is controlled according to 800-840 ℃;5), spitting silk temperature is controlled according to 900-920 ℃, and a group of water tank cooling is opened before pre-water cooling section finishing rolling, and four groups of water tank cooling are opened after water cooling section finishing rolling;Finishing rolling unit cooling water pressure is controlled between 4.5~4.8kPa;6, fan is all off.The purpose of the application is to realize the low temperature high speed temperature control rolling of wire, and finally obtain high quality, good stability hot rolled deformed bar, and meanwhile, the alloy cost of deformed bar is better reduced.

This invention discloses a wide-flange hot-rolled H-beam with a thickness of 20-80 mm and its production method. The wide-flange hot-rolled H-beam comprises Fe and trace residual elements, and further comprises 0.15-0.20 parts C, 0.20-0.40 parts Si, 1.20-1.60 parts Mn, 0-0.025 parts P, 0-0.015 parts S, 0-0.030 parts Nb, 0.020-0.100 parts V, and 0.010-0.025 parts Al, in parts by weight. The specifications of the hot-rolled H-beam product are: flange thickness 20 mm-80 mm, web height 400 mm-1000 mm, flange width 400 mm-500 mm, and a web height / flange width ratio of 1.0-2.0. The hot-rolled H-beams produced meet the strength grade requirements of Q355~Q420 and the impact performance requirements of grades B~C; among which, grade B requires a longitudinal impact energy value of not less than 100J, and grade C requires a longitudinal impact energy value of not less than 80J. This invention features a simple process and low production cost; it develops products with flange thicknesses of 20~80mm and flange widths of 400mm~500mm, meeting the needs of underground engineering and building structure industries for wide-flange hot-rolled H-beams.

Provided is a manufacturing method of composite-phase steel. The method includes: reheating a steel slab including, by wt %, C:0.05 to 0.15%, Si:0.01 to 1.0%, Mn:1.0 to 2.3%, Al:0.01 to 0.1%, Cr:0.005 to 1.0%, P:0.001 to 0.05%, S:0.001 to 0.01%, N:0.001 to 0.01%, Nb:0.005 to 0.07%, Ti 0.005 to 0.11%, Fe and unavoidable impurities at a temperature of 1200 to 1350° C.; finish hot rolling the reheated steel slab; primarily cooling the hot-rolled steel sheet to a mid-temperature range of 550 to 650° C.; and secondarily cooling a region of the head part and the tail part corresponding to an outer wound portion of a coil during winding to a temperature range from 450 to 550° C., and secondarily cooling a region of the mid part corresponding to an inner wound portion of the coil to the temperature range from 400 to 500° C., and coiling the secondly cooled steel sheet.

The utility model relates to the technical field of metal processing, and provides a hot rolled steel strip correcting and straightening device which comprises a base, a downward pressing structure is fixed on one side of the top end of the base, an adjusting structure is arranged on the side, away from the downward pressing structure, of the top end of the base, and the adjusting structure comprises an adjusting groove formed in the side, away from the downward pressing structure, of the top of the base. The adjusting structure further comprises a servo motor fixedly installed on the outer wall of one side of the base, and adjusting blocks are arranged on the two sides of the interior of the adjusting groove. By arranging the adjusting structure, the adjusting blocks can be driven to move oppositely or reversely under the rotating action of the lead screw, so that the distance between the limiting rollers can be conveniently changed, the limiting distance of the limiting rollers in use can be conveniently adjusted, and the steel belt limiting device is suitable for steel belts with different widths; according to the hot rolled steel strip straightening and straightening device, the function that the distance between the limiting rollers in the using process is conveniently adjusted is achieved, and the applicability of the hot rolled steel strip straightening and straightening device in the using process is improved.

A hot rolled, ultra-high strength, complex metallographic structured or multi-phase structured steel that improves formability during stamping or forming process, while possessing one or more of the following properties: excellent castability, rollability and coatability, excellent structural performance, excellent stretch formability, excellent stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance, excellent intrusion and crash resistance without the purposeful addition of boron.

This invention relates to a method for controlling the cooling water volume of pre-oxidized high-speed steel rolls during the rolling of hot rolls, belonging to the technical field of control methods applicable to metal rolling mills. The method first calculates the target rolling pressure range using the rolling pressure recorded under n rolling plans for normal, non-pre-oxidized high-speed steel rolls. Then, it calculates the required cooling water volume for the pre-oxidized high-speed steel rolls. During the rolling of hot rolls with the pre-oxidized high-speed steel rolls, the rolling pressure is recorded and it is determined whether it falls within the target rolling pressure range. This determines whether the calculated cooling water volume remains unchanged. If it does, a new cooling water volume is recalculated, and this process is repeated until a suitable cooling water volume is selected. This method simultaneously correlates the roll thermal crown with both rolling pressure and cooling water volume. It judges and controls the change in roll thermal crown by whether the rolling pressure of the pre-oxidized high-speed steel roll during the rolling of hot roll material falls within the target rolling pressure range.