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1251results about "Roll mill control devices" patented technology

Method for controlling hot continuous rolling finish rolling process

The invention provides a method for controlling a hot continuous rolling finish rolling process, which belongs to the technical field of automatic steel rolling control. The method is that after the parallel data interface (PDI) data is obtained, according to the technological requirements which are established in a rolling plan, the thickness of a hot continuous rolling finish rolling target outlet and the target temperature of the finish rolling outlet are determined; the practical temperature of a hot continuous rolling finish rolling inlet is obtained; the load distribution of a rack is determined; rolling parameters including the roller linear velocity, inlet temperature, rolling force, roller gap position and motor power parameter of various racks are calculated; the rolling parameters are subjected to limit checking and are judged whether to meet the operation conditions of equipment or not, if yes, the rolling parameters are sent to a control system in a command mode, and the hot continuous rolling finish rolling process is controlled; and if not, calculation is carried out again. Through calculating the rolling force, the prediction precision and the thickness precision are improved, the service cycle of a roller is accurately predicted, based on a roller thermal expansion model, the rolling process has different rolling intervals, and good thickness controlling precision is obtained.
Owner:NORTHEASTERN UNIV

Hot rolled steel plate with excellent low-temperature toughness for thick submerged pipeline and production method of hot rolled steel plate

The invention provides a hot rolled steel plate with excellent low-temperature toughness for a thick submerged pipeline and a production method of the hot rolled steel plate. The hot rolled steel plate comprises the following chemical components by weight percentage: 0.02%-0.07% of C, 0.15%-0.40% of Si, 1.0%-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.003% of S, less than or equal to 0.06% of Nb, less than or equal to 0.025% of Ti, less than or equal to 0.06% of V, less than or equal to 0.20% of Mo, less than or equal to 0.25% of Cu, 0.10%-0.30% of Ni, less than orequal to 0.25% of Cr, less than or equal to 0.008% of N, 0.010%-0.040% of Al, more than or equal to 2 of Al/N and the rest Fe and inevitable impurities. According to the steel for the submerged pipeline with the thickness being over 28mm, disclosed by the invention, the transversal and longitudinal bending strength can reach over 480MPa or 510MPa, the transversal and longitudinal tensile strengthcan reach over 560MPa or 600 MPa, the transversal impact toughness at the temperature of 60 DEG below zero is larger than or equal to 400 J, the transversal DWTT (Drop-Weight Tear Test) shearing areaat the temperature of 25 DEG C below zero is larger than or equal to 85%, simultaneously, the corrosion resistant of the steel plate is excellent, and the result of a 96-hour HIC (Hydrogen Induced Cracking) test conforms to the requirements of the standard 0284 of the NACE (National Association of Corrosion Engineers). The hot rolled steel plate is suitable to be as a raw material for manufacturing a pipeline for submerged oil and gas transmission.
Owner:ANGANG STEEL CO LTD

Steel plate for low temperature pressure container and producing method thereof

The present invention relates to a steel plate used for a low temperature pressure vessel and the production method thereof. The steel plate has the main chemical composition content (wt percent) that C is 0.12-0.19 percent, Si is 0.15-0.45 percent, Mn is 1.2-1.6 percent, Nb is 0.015-0.050 percent, Ti is 0.01-0.03 percent, Ni is 0.10-0.35 percent, Al is 0.015-0.050 percent, and P is 0-0.015 percent; S is 0-0.01 percent, and the residual is Fe and inevitable impurity. The present invention uses a new process technology of hot billet steel furnace loading, intermediate billet water cooling, controlled rolling, controlled cooling accelerating, and normalizing, which is easy to be operated, reduces the dosage of the alloying element to the lowest, in particular, largely reduces the use of the precious metal Ni, the transverse impact power of the low temperature toughness 40 below zero is up to 164 J, transverse impact power of 30 below zero is up to 298 J, and CTOD is Delta 0.20 equal to 0.40 mm in the test condition that the temperature is 40 below zero. The cost of the steel type is relatively lower, the hourly output is high, the intensity is moderate, the plasticity is good, the low temperature toughness is high, the welding performance is extremely fine, and thereby the steel type can be widely applied to low temperature vessels for storing and delivering low temperature liquid in various industries and the petroleum and the chemical industry fields.
Owner:SHANDONG IRON & STEEL CO LTD

Low alloy high-strength steel plate capable of being welded in large energy input and method of producing the same

The invention provides a high strength low alloy steel plate suitable for high heat input welding and is characterized in that the chemical composition (wt percent) of steel comprises 0.04 percent to 0.16 percent of C, 0.10 percent to 0.50 percent of Si, 0.40 percent to 1.8 percent of Mn, 0.020 percent to 0.050 percent of Nb, 0.006 percent to 0.030 percent of Ti, 0.0030 percent to 0.010 percent of N, 0.015 percent to 0.060 percent of Al and the rest, Fe and other inevitable impurities; meanwhile, C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14 is less than or equal to 0.45 percent and the total amount of Ti and the total amount of N are that [Ti percent]T is more than or equal to 2.667[N percent]T-0.004667 percent; moreover, Ti microalloying is adopted to ensure that the Ti/N ratio in the second sort of particle generated ranges between 2.4 and 3.2. The manufacture method of the steel plate adopts austenite recrystallization zone and austenite non-recrystallization zone rolling and forced water cooling after rolling; moreover, when the steel plate is under 50 KJ/cm to 150 KJ/cm high heat input welding, the welding heat affected zone has excellent toughness. The invention has the advantages of simple production process, low cost and wide applicability.
Owner:ANGANG STEEL CO LTD

Method for producing hot-rolled ferritic stainless steel strip steel

InactiveCN101245435AFree from common surface defectsNo surface defectsRoll mill control devicesHeat treatment process controlSurface finishChemical composition
The invention discloses a method for producing a hot-rolled ferrite stainless strip steel, which comprises the following steps: 1) the chemical components by weight percentage are: 0.025-0.04 percent of C, less than or equal to 1.00 percent of Si, 0.25-0.4 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.035 of P, 12-12.5 percent of Cr and the rest is Fe; 2) a billet is formed by smelting and casting; 3) heating: the heating temperature zone for heating are divided into a heat recovery section, a preheating section, a I heating section, a II heating section and a holding section; furnace gas is controlled to be neutral atmosphere of non-oxidizing atmosphere; 4) when in heat rolling and rough rolling, the rolling temperature is 1,120 DEG C-1,160 DEG C, and the deforming speed during rolling is 10/s-12/s; 5) finish rolling: the deforming speed of the last pass rolling is 60/s-90/s, and the outlet temperature of the finish rolling is more than 900 DEG C; 6) cooling is carried out after rolling, and then reeling is carried out. The method of the invention has the advantages that the method guarantees not only the edge quality of the hot-rolled strip steel but also the stamping property of the cold-rolled strip steel, improves the surface finish quality and lowers the production cost, and has high production efficiency and rolling yield, etc.
Owner:BAOSHAN IRON & STEEL CO LTD

Mn-containing creep-resisting rolled zinc alloy belt material and preparation method thereof

InactiveCN101906555AOutstanding advantagesHighlight positive effectsRoll mill control devicesMetal rolling arrangementsRare-earth elementManganese
The invention relates to a Mn-containing creep-resisting rolled zinc alloy belt material. The material comprises the following components in percentage by weight: 0.5 to 3.0 percent of copper, 0.01 to 2.0 percent of manganese, 0.05 to 0.3 percent of titanium and the balance of zinc and less than 0.05 percent of impurities. An alloy component can also contain the following component in percentage by mass: 0.01 to 0.5 percent of X, wherein the X is at least one of aluminum and rare earth elements (Ce+La). A method for preparing the material comprises the following steps of: smelting by a protective covering method and adding alloy elements in the forms of pure zinc, Zn-Cu, Zn-Ti, Cu-Mn, pure aluminum and Ce+La composite rare earth, wherein a smelting temperature is between 650 and 740 DEG C; pouring at the temperature of between 420 and 480 DEG C; uniformly annealing cast ingots at the temperature of between 350 and 380 DEG C for 6 to 10 hours; performing hot rolling for multiple times at the temperature of between 220 and 280 DEG C, wherein total deformation is between 60 and 95 percent; performing cold rolling, wherein the total deformation is between 50 and 80 percent; and after rolling, annealing at the temperature of between 180 and 200 DEG C for 2 to 3 hours. The alloy of the invention has high creep resistance, hot processing performance and mechanical property and is suitable for the fields of building decoration, transportation, instruments, meters and the like.
Owner:CENT SOUTH UNIV

Method for calculating and locating strip steel head of automatic stepping system of hot continuous rolling coiling machine

The embodiment of the invention provides a method for calculating and locating the strip steel head of an automatic stepping system of a hot continuous rolling coiling machine, comprising the following steps of: detecting whether the strip steel enters a pinch roll, wherein when the strip steel is detected to enter the pinch roll, the automatic stepping process begins, the head position of the strip steel is calculated according to the speed of a lower pinch roll; detecting the tension of a main drum, if the tension of the main drum is not established, the head position of the strip steel is continuously calculated according to the speed of a lower pinch roll, if the tension of the main drum is established, the head position of the strip steel is continuously calculated by using the momentary position of the strip steel head at the main drum at the tension establishing moment as a start point; detecting whether the set wrapping number of turns is finished, if the set wrapping number of turns is not finished, the head position of the strip steel is continuously calculated by using the head position of the strip steel at the tension establishing moment as a start point; if the set wrapping number of turns is finished, the automatic stepping process stops and the calculation for the head position of the strip steel is finished. The invention can effectively overcome the defects that an on-site hot metal detector and an optoelectronic detecting element are subject to various on-site interferences.
Owner:WUHAN IRON & STEEL (GROUP) CORP

Micro-tracking method and system of rolled pieces in the process of rolling periodic variable-thickness strips

A micro-tracking method and a system of rolled pieces in the process of rolling periodic variable-thickness strips belong to the technical field of rolling. The method comprises the following steps: dividing thickness zones, thinness zones and transition zones on the rolled pieces of the periodic variable-thickness strips, setting whether the incoming materials are uniform-thickness rolled pieces or periodic variable-thickness rolled pieces, determining the starting point of rolling, micro-tracking the rolling length in the process of rolling and carrying out tracking correction on the periodic variable-thickness rolled pieces. The system comprises a rolling mill; coiling machines are arranged at both sides of the rolling mill respectively; length-measuring rollers are arranged between the coiling machines and the rolling mill; thickness gauges are arranged at both sides of the rolling mill respectively; coil diameter gauges are arranged on the coiling machines; a rolling force sensor and a hydraulic cylinder are arranged on the rolling mill; tensiometers are arranged below the length-measuring rollers and pulse coders are arranged on the length-measuring rollers; the thickness gauge, the coil diameter gauge, the rolling force sensor, a displacement sensor of the hydraulic cylinder, the tensiometer and the pulse coder are respectively connected with a computer control system.
Owner:SHENYANG DONGBAO HAIXING METAL MATERIAL TECH

Rolling mill hydraulic AGC system and control method thereof

The invention discloses a hydraulic AGC system of a rolling mill, and a control method thereof, and the system is connected to be formed in a manner of double closed loop of an inner-outer loop that is combined by an outer closed loop and an inner single closed loop. A thickness measuring device is taken as a feedback element, a deviation signal of the feedback value of the thickness measuring device and a given thickness value is firstly input into a PID controller which is based on Smith predictor function and then is input into the PID controller in the inner single closed loop, the deviation signals of a position sensor, a pressure sensor, a tension sensor and the feedback value of an speed measuring device are input into the PID controller; the PID controller processes the signals by a control module, and a touch screen HMI device is used for setting and displaying the parameters of the system and operating and monitoring all the steps. As the strategy of the PID controller based on Smith predictor function is introduced in the invention, the feedback and response speed is fast, thus improving the control precision and stability of the system obviously. The system and the method have the advantages of simple installation and debugging, convenient operation and reliable running.
Owner:JIANGSU UNIV OF SCI & TECH

Production method of high magnetic induction grain-oriented silicon steel strip

The invention discloses a production method of a high magnetic induction grain-oriented silicon steel strip, comprising the following processes of: controlling chemical compositions in a continuous casting, heating the continuous casting to 1100-1200 DEG C and then hot rolling into a hot rolled steel strip the thickness of which is 2.0-2.5mm, carrying out two-stage normalizing annealing, single cold rolling into a cold rolled steel strip the thickness of which is 0.23-0.30mm, continuously decarbonizing, continuously nitriding, and carrying out secondary recrystallization annealing, normalizing cooling and the like, wherein in the process of continuously decarbonizing, N in the cold roller steel strip is controlled at 0.018-0.031 percent by weight; in the process of secondary recrystallization annealing, the escape amount of N in the cold rolled steel strip is controlled within the range of 3-27 percent of the total weight of the cold rolled steel strip when the temperature is 950-1050 DEG C, and finally, the high magnetic induction grain-oriented silicon steel strip is produced. The method has moderate heat treatment temperature on a plate blank, easy control on processes and high quality of obtained products, thereby meeting the needs of high magnetic induction grain-oriented silicon steel used for transformer cores.
Owner:武汉钢铁有限公司

Band steel deflection and floating quantity laser scanning detection method and deflection correction system

The invention discloses a band steel deflection and floating quantity laser scanning detection method, which comprises the following steps that: 1) a linear laser emitter is used for irradiating the band steel, and a laser linear light beam is formed on the band steel in the width direction; 2) a plane array image sensor arranged above the band steel is used for scanning the laser linear light beam in real time; 3) the scanned laser linear light beam is sent into a computer, and the computer determines the band steel edges according to the laser linear light beam; and 4) the band steel deflection quantity can be calculated according to the band steel edges determined by the computer at different moments, and simultaneously, the upwards and downwards floating quantity of the band steel canbe calculated according to the displacement quantity of the laser linear light beam in the length direction of the band steel. The band steel deflection and floating quantity laser scanning detectionmethod has the advantages that the cost is low, the detection precision is high, the real-time performance and the anti-jamming capability are high, the long-time stable operation can be realized in complicated environment, the band steel deflection automatic detection level is favorably improved, the installation and the maintenance of equipment are convenient, and the technical support is provided for the efficient production of the band steel.
Owner:CHONGQING UNIV

Continuous casting bearing steel round steel and method for producing the same

The invention relates to a continuous casting bearing steel round steel with small compression ratio and high cleanliness, the chemical components according to weight percentage are: 0.90 to 1.10 percent of C, 0.20 to 0.50 percent of Mn, 0.15 to 0.50 percent of Si, 1.30 to 1.60 percent of Cr, being equal to or less than 0.0007 percent of oxygen, being equal to or less than 0.008 percent of phosphorus, being equal to or less than 0.005 percent of sulfur, being equal to or less than 0.0025 percent of titanium, being equal to or less than 0.25 percent of copper, being equal to or less than 0.10 percent of nickel, and the rest of Fe and inevitable impurities. The manufacturing method of the continuous casting bearing steel round steel with small compression ratio and high cleanliness comprises the following steps: the selection of liquid steel for steel-making, ladle pouring, pouring box continuous casting bearing steel square billet, heating continuous casting bearing steel square billet in a heating furnace, and rolling the continuous casting bearing steel round steel with the specification Phi from 20 to 75mm(compression ratio can reach the minimum 10.96) in a rolling mill. The nonuniformity of the eliquation carbide and the ribbon carbide of the obtained continuous casting bearing steel round steel reaches China national standards and meets the requirements of bearing manufacturer.
Owner:BAOSTEEL SPECIAL STEEL CO LTD

Method for manufacturing composite aluminum foil for car heat exchanger

The invention discloses a metal material processing technology, in particular to a manufacturing method used for manufacturing an aluminum-alloy compound foil. The method includes the following steps: the aluminum liquid is cast into an ingot through melting, smelting, sediment-removing and stirring; the ingot is heated and rolled into an aluminum-ally plate; the aluminum-alloy plates of an upper and a lower claddings are washed and then are covered onto an upper surface and a lower surface of a cast plate of a core layer, then the alloy plates are welded into a whole; the welded alloy plates are heated and hot rolled into a blank, and the hot rolled blank is rolled into a foil material through a cold rolling mill; in the end the foil material is put into an annealing furnace for a medium annealing; after taken from the annealing furnace, the foil material is rolled, drawn and cut fine so as to make into the compound foil used for an automobile heat exchanger. The invention has the advantages that a microstructure of the compound foil and the distribution form and structure of a second-phase particle are enhanced so as to raise the structural capability of the compound foil; the optimized welding, hot rolling, cold rolling and medium annealing techniques lead to equal structure and conformed thickness and size of the claddings.
Owner:JIANGSU ALCHA ALUMINUM CO LTD

Manufacturing technology of molybdenum-based rare-earth alloy slab and equipment thereof

The invention relates to a process for manufacturing the molybdenum based rare earth alloy plate and equipment for manufacturing the same, wherein pure molybdenum powder is simultaneously added with four rare earth oxides of ZrO2, Y2O3, La2O3 and Nd2O3 according to certain ratio, by utilizing the chrematistics of long and large crystal grain and strong sag resistance and anti-creep property of rare earth alloy elements and the dispersion strengthening function, the re-crystallization temperature of the metal molybdenum is increased, the mechanical performances of the molybdenum based material such as tensile property, yielding behavior and extensibility are improved, and the application range of the molybdenum based material is widened; and the manufacturing process comprises production procedures of material preparation treatment, mixing treatment, forming treatment, sintering treatment, material making treatment and the like and the setting of various technical parameters of special technical equipment and process. With the preparation process, the molybdenum based rare earth alloy plate which has the advantages of good electric conductivity and heat conductivity, excellent high-temperature resistance and corrosion resistance and better mechanical performances such as tensile property, yielding behavior and extensibility, and fills in domestic blank and can replace the imported material can be manufactured.
Owner:四平市北威钼业有限公司
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