1251results about "Roll mill control devices" patented technology

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

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.

The invention discloses a high-strength weatherabile steel and manufacturing method in the low-alloy steel making domain, which is characterized by the following: adding low-carbon and Cu-Cr-Ni-Mo-Nb into two or more composite additives; controlling carbon content with maximum solubility in the alpha-Fe at 0.0218% under normal temperature; reducing carbon-permeating evolution; affirming main control tissue evenly.

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.

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.

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.

The invention discloses a processing process for a Ti-alloy sheet, which comprises such procedures as packing alloy on sponge titanium, industrial pure aluminum and Al-85V intermediate alloy, pressing and plasma welding the sponge titanium, the industrial pure aluminum and the Al-85V intermediate alloy, then smelting through a secondary vacuum self-consuming arc smelting method the sponge titanium, the industrial pure aluminum and the Al-85V intermediate alloy into cast ingots, cutting blanks from the cast ingots, blanketing the cut blanks into sheet blanks, forging freely on an air hammer into sheet blanks, rolling on a roller at temperature 900-1000 DEG C, holding the temperature for 50 minutes (deformation in each pass is 3-4 mm at initial rolling, rolling 2-5 passes, interrupting intermediately), finally rolling into Ti-alloy sheets, planing and cleaning surface, and getting finished product. The invention is of easy operation, high process controllability, enables TC4-DT alloy sheet to maintain good matching among strength, breakage toughness and plasticity, and improves the steadiness in performance of different sheet lots.

The invention discloses a high-plasticity 780MPa-level cold rolled dual-phase steel and a preparation method thereof. The steel comprises the following chemical components in percentage by weight: 0.06 to 0.08 percent of C, 1.0 to 1.3 percent of Si, 2.1 to 2.3 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.02 to 0.07 percent of Alt, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. According to the hot rolling process parameters, the heating temperature of a continuously cast bloom is 1,250+/-30 DEG C, the final rolling temperature is 890+/-30 DEG C, the coiling temperature is 670+/-30 DEG C, the cold rolling press-down rate is 50 to 70 percent, and the continuous annealing process is controlled. The invention has the advantages that: the C equivalent weight of the steel is effectively reduced by regulating the components of the alloy based on a conventional gas jet cooling and continuous annealing mode, the elongation of the steel is improved, and considerable economic benefit can be brought.

The invention provides a middle and high grade cold rolled no-orientation silicon steel and a manufacturing method for the no-orientation silicon steel, the components of which are C: 0.0015%-0.005% Si: 1.60%-3.30% Mn: 0.50-2.50% P<=0.050% S: 0.0010%-0.0050% Al: 0.15%-0.50% and N: 0.0010%-0.0050%, small amount of Sn, Sb, Cu can be added, total mount is <0.20%, the remainder are Fe and unavoidable foreign matters and Mn%=k is multiplied by |Si+2Al-2.05|%+0.28%, wherein, k=1.0-3.0. The manufacturing method is like follows: hot rolling, pickling, cold rolling and annealing the cast blanks of above components. The heating temperature for the cast blanks at hot rolling is 1050-1200 DEG C, the rolling passes are 3-5 no.s, the pressure-down rate is 20-40% for each pass; the temperature for fine and final rolling temperature is 800-900 DEG C, coiling temperature is 600-680 DEG C, and the annealing is done in a dry protective atmosphere. The method is of low process difficult, low cost and high product surface quality.

Process to monitor and control the quality of rolled products from hot-rolled processes which produce products such as sheets, rods, etc., from input stock such as slabs, billets, etc. The process estimates in advance the expected material properties of the end product at each step of the hot-rolling production process. The process further provides that conditions, such as temperature, reduction depth, etc., are detected on-line throughout the entire rolling process and from the values obtained, via interrelated physical-metallurgical and/or statistical models describing the whole rolling process, the mechanical/technical material properties to be expected, particularly the yield point, the tensile strength and the breaking elongation point of the rolled product, are calculated. On-line detection of the actual and momentary production conditions is necessary to allow the material properties to always be estimated in advance.

A method for predicting the structure variation and properties of band steel in hot rolling procedure features that its system is composed of the preprocessing module for reading the technological parameters needed by hot rolling from database, the heating module, rolling module, cooling phase-change module and mechanical performance module for simulating the hot rolling procedure and predicting the final structure performance, and the post-precessing module for displaying the final result.

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.

The invention provides a wire rod for a galvanized steel wire of a 1770MPa bridge stay cable comprising the following chemical elements (by wt percentage): C, 0.85 to 0.9; Si, 0.12 to 0.32; Mn, 0.6 to 0.9; P, less than or equal to 0.025; S, less than or equal to 0.025; Cr, 0.1 to 0.25; V, less than or equal to 0.06; Cu, less than or equal to 0.1; the rest, inevitable impurity elements. The invention also provides a manufacturing method of the wire rod. The wire rod provided by the invention has the tensile strength Rm of 1300 to 1400 MPa, the elongation after fracture A which is more than or equal to 8 percent, and the contraction of area Z which is more than or equal to 30 percent (after aging, the contraction of area is more than or equal to 35 percent). The galvanized steel wire made of the wire rod can completely meet the technical requirements of the galvanized steel wire of the 1770MPa bridge stay cable, such as fatigue tests of high dynamic load (more than or equal to two million cycle-index), high toughness and high torsion (more than or equal to eleven times), etc.

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.

The present invention relates to one kind of weather resistant hot roller narrow steel strip for welded structure and its production process. The steel strip has the chemical composition comprising C 0.07-0.12 wt%, Si 0.25-0.50 wt%, Mn 0.30-0.50 wt%, P 0.07-0.15 wt%, S less than 0.035 wt%, Cu 0.25-0.40 wt%, Cr 0.30-1.2 wt%, Ni 0.10-0.50 wt%, and Fe and inevitable impurity for the rest. It is produced through smelting in a top blown converter, LF refining, continuously casting steel strip billet and hot rolling in a continuous rolling mill train. It has high purity, excellent corrosion resistance, excellent welding performance and homogeneous mechanical performance. It may be applied in making square welded tube or other accessories for container.

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.

The invention relates to an aluminum alloy foil material used in a brazing heat exchanger and a manufacturing method of the materials; wherein, indicated by weight percentage, the components of the material comprise0.50 to 1.00 of Si, less than or equal to 0.60 of Fe, 0.05 to 0.10 of Cu, 1.00 to 1.60 of Mn, less than or equal to 0.05 of Mg, 1.60 to 2.20 of Zn, 0.10 to 0.20 of Zr, 0.01 to 0.05 of Ti and unavoidable impurities and the allowance is Al; the materials are made through the manufacturing steps of melting, standing furnace refinement, grain refinement, online degassing, filtration, continuous cast rolling, cold rolling and finishing rolling. The aluminum alloy foil of the invention has the thinner thickness of 0.05mm; the tensile strength is more than 250N/mm<2>, which improves the brazing property; at the same time, the invention is simple in technique and saves the production cost by more than at least 50 percent compared with the method of hot rolling, and therefore, the aluminum alloy foil of the invention has better economic and social benefits.

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.

The invention discloses a precise machining method for a capillary tube for a biodegradable magnesium alloy intravascular stent. The method comprises the following steps of: step 1, performing stress relief annealing and machining on a magnesium alloy extrusion bar to obtain a tube blank; step 2, extruding the tube blank to obtain a seamless extrusion tube blank, and performing stress relief annealing; step 3, performing multi-pass rolling and annealing on the annealed seamless extrusion tube blank to obtain a thin tube blank; and step 4, performing multi-pass drawing and annealing on the thin tube blank to obtain the capillary tube for the biodegradable magnesium alloy intravascular stent. The capillary tube produced by the method disclosed by the invention is accurate in dimension (a wall thickness error is not greater than 5%), can be more than 1 metre long, is high in surface quality, uniform in matrix structure, excellent in mechanical property, low in machining cost and high in machining efficiency, and can be subjected to industrialized batch production.

The invention provides a hot-rolled high reaming steel sheet with tensile strength of 440MPa, comprising the following chemical composition (weight percent): C: 0.01 to 0.06 percent, Si: 0 to 0.6 percent, Mn: 0.8 to 1.3 percent, P: less than or equal to 0.035 percent, S: less than or equal to 0.010 percent, Al: 0.025 to 0.060 percent, N: less than or equal to 0.0060 percent, Nb: 0 to 0.25 percent, and the rest are Fe and inevitable impurities. The invention also provides a preparation method of the hot-rolled high reaming steel sheet, and the method does not need heat treatment, can reduce the cost, and needs no complicated control of cooling technology after hot rolling, which is convenient for production. The steel sheet provided by the invention has good reaming performance, moldability and cold processing performance, and is mainly used for the molding and processing of parts with complicated shapes for automobile chassis.

The invention provides a high-strength and high-yield ratio cold-rolled steel sheet and a manufacturing method thereof. The high-strength and high-yield ratio cold-rolled steel sheet comprises the following chemical components by the weight percentage: C: 0.08 percent to 0.14 percent, Si: 0.4 percent to 1.0 percent, Mn: 1.2 percent to 2.0 percent, P: less than or equal to 0.03 percent, S: less than or equal to 0.02 percent, N: less than or equal to 0.008 percent, Al: 0.02 percent to 0.06 percent, Nb: 0.01 percent to 0.03 percent, and the rest are Fe and inevitable impurities. The high-strength and high-yield ratio cold-rolled steel sheet is manufactured through processes, such as final rolling at normal temperature, coiling at low temperature, heating and heat preservation at quite high temperature, quick cooling and the like. The yield strength of the cold-rolled steel sheet is more than or equal to 500Mpa, the tensile strength is more than or equal to 600Mpa and the yield ratio is more than or equal to 0.80; therefore, the steel sheet can meet the requirements of the automobile manufacturing industry for high-yield ratio steel sheets with higher strength.

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.

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.

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.

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

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.

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.

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.

The invention discloses a rolling method of low-banded structure gear steel. The method comprises the following steps of: (1) heating a steel blank within a three-section type heating furnace; (2) carrying out dephosphorization on the heated steel blank by high-pressure water, and sequentially carrying out rough rolling, intermediate rolling, water cooling, and finish rolling; (3) water-cooling and air-cooling the finish-rolled steel blank sequentially; and (4) slowly cooling the cooled round bar steel to be lower than 200DEG C after shearing. Due to the use of the rolling method, the production technology difficulty that the level of the high-end hardenability carburized gear steel banded structure is hard to lower due to the conventional rolling technology can be overcome, so that that the level of the banded structure of the gear steel is lowered to be lower than 1.0 grade from 3.0 grade of the conventional rolling technology, and therefore, the aim of prolonging the fatigue life of the gear can be achieved. The rolling method further has the characteristics of being simple in technical route, low in production cost, high in operability and the like.

The invention discloses an austenitic stainless steel and a manufacturing method thereof. The weight percentages of the chemical components of the stainless steel are as follows: C, less than or equal to 0.03 percent; Si, 0.3 to 0.9 percent; Mn, 0.6 to 1.5 percent; Cr, 16.0 to 18.0 percent; Ni, 5.5 to 7.5 percent; N, 0.1 to 0.25 percent; P, less than or equal to 0.040 percent; S, less than or equal to 0.03 percent; the rest, Fe and inevitable impurity elements; wherein, the numerical value of Md30 is 20 to 60. The manufacturing method of the stainless steel is as follows: 1) preparation of ingots or slabs; 2) hot rolling; 3) annealing and acid pickling; 4) cold rolling with the reduction no less than 50 percent; 5) heat treatment and acid pickling. The method can lead the material elongation reach above 25 percent and improve the corrosion resistance of high-strength austenitic stainless steel used in vehicles and the processing and manufacture performance of steel.