47results about How to "Raise the rolling temperature" patented technology

The invention provides an X80 hot rolling steel plate used for a high-obdurability spiral hidden arc welded tube and a production method thereof, which belong to the technical field of steel rolling. The X80 hot rolling steel plate comprises the following compositions in weight percentage: 0.03 to 0.08 weight percent of carbon, 0.10 to 0.25 weight percent of silicon, 1.60 to 1.95 weight percent of manganese, 0.09 to 0.11 weight percent of niobium, 0.020 to 0.030 weight percent of vanadium, 0.010 to 0.020 weight percent of titanium, 0.10 to 0.30 weight percent of molybdenum, 0.10 to 0.30 weight percent of copper, 0.10 to 0.30 weight percent of nickel, 0 to 0.30 weight percent of Cr, less than or equal to 0.018 weight percent of phosphor, less than or equal to 0.003 weight percent of sulfur, less than or equal to 0.006 weight percent of nitrogen, 0 to 0.0005 weight percent of boron, less than or equal to 0.0003 weight percent of hydrogen, and the balance being ferrum and unavoidable trace impurities. The production method comprises the following steps: heating the compositions at a temperature of between 1,150 and 1220 DEG C; stopping rough rolling at a temperature of between 1,020 and 1,080 DEG C; stopping fine rolling at a temperature of between 800 and 840 DEG C; coiling the rolled steel sheet at a temperature of between 400 and 480 DEG C; and performing fine rolling according to the compression ratio, that is the thickness of an intermediate billet to that of finishing outlet is more than or equal to 3. The X80 hot rolling steel plate is particularly suitable to be used in a gas pipeline with high pressure, long distance and large aperture.

The invention provides a multi-field coupling roll finishing device for a conical surface. Multi-field coupling particularly means coupling of a high-temperature thermal field, a variable frequency pulsed magnet field and an ultrasonic field. The multi-field coupling roll finishing device comprises a rolling knife, an amplitude-change pole, a transducer, an ultrasonic generator, a thermocouple coil, a temperature controller, a pulsed magnet field intensifying system, a dynamometer and a mounting rack. A novel rolling knife structure is designed, so that different rolling wheels can be replacedaccording to different rolling workpieces, meanwhile, different rolling angles can be replaced according to different conical surface angles of workpieces, and accordingly, the use is convenient andreliable. According to the multi-field coupling roll finishing device, the heating temperatures of the workpieces can be controlled by a temperature controller, the rolling temperature of the workpieces is increased, and the atomic vitality of the workpieces is enhanced, dislocation movement is overcome, the resistance is reduced, and accordingly, a favorable rolling surface quality is acquired. The conical workpieces are placed in a pulsed magnet field acting region, so that the hardness and the wear resistance of the workpieces are improved. The value of a rolling force in a rolling processcan be monitored in real time by the dynamometer, and the rolling force in the rolling process is kept constant by feedback of a digital control system. An ultrasonic rolling system which can be mounted on a common lathe is designed to roll a conical-surface shaft part, the surface roughness of the part can be reduced, the surface hardness is improved, and favorable surface quality and mechanicalperformance are acquired.

The invention discloses a preparation method of a rough rolling high-speed steel working roll for full endless rolling of sheet billets. The preparation method comprises the following steps that A, scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, ferrotungsten and electrode powder are taken as raw materials, a line frequency furnace is adopted for smelting outer-layer molten iron and core molten iron; B, the product manufacturing mode is centrifugal composite manufacturing, and after smelting components reach the standard, outer-layer molten iron and core molten iron are heated, discharged out of a furnace and poured; C, after pouring is completed, a box is opened in a cold mode, and rough machining is conducted after the box is opened in the cold mode; D, after machining is completed, a roll body is subjected to quenching heating and overall tempering treatment; and E, after quenching heating is finished, finish machining is conducted, and detection is conducted till a finished product is obtained. According to the method, the requirements of short-process endless rolling technologies such as ESP are met, and the roll quality is improved.

The invention provides a steel plate for a low-carbon high-niobium high strength welding structure. The steel plate comprises the following chemical components in percentage by weight: 0.015 to 0.075 percent of C, 0.20 to 0.50 percent of Si, 1.63 to 2.0 percent of Mn, 0.081 to 0.12 percent of Nb, 0.005 to 0.030 percent of Ti, 0.0005 to 0.0030 percent of B, 0.50 to 0.95 percent of Cr, 0.70 to 1.25 percent of Cu, 0.50 to 1.50 percent of Ni, 0.30 to 0.60 percent of Mo, 0.010 to 0.050 percent of Als, and the balance of Fe and inevitable impurities. The method for manufacturing the steel plate comprises the steps of molten iron pretreatment, rotary furnace smelting, refining, continuous casting and rolling, wherein the rolling process adopts the HTP plus RPC process, the heating temperature before rolling is between 1,140 and 1,220 DEG C, and two-stage controlled rolling is adopted. The steel plate is low in carbon content and high in Nb content, so that the initial rolling temperature of the non-recrystallization controlled rolling is increased, the temperature holding time is short, and the manufacturing efficiency is high; because the carbon content and the carbon equivalent are low, the welding performance is good; and with the HTP plus RPC plus annealing process, the steel plate for the welding structure with good toughness and plasticity and the yield strength more than or equal to 960N / mm<2> can be manufactured.

The invention discloses a method for manufacturing a difficult-to-deform tin-bismuth alloy pre-formed soldering lug. The method is characterized in that a core process adopts a two-section type temperature-regulating variable-speed and turning calendaring process, namely low-temperature high-speed large-rolling-reduction rough rolling and high-temperature low-speed small-rolling-reduction fine rolling; a temperature, speed and a rolling direction in a calendaring process are controlled, and other processes comprising low-temperature smelting, residual stress relief hot-levelling, rolling, cutting and the like are combined, so that high-efficiency manufacturing for the difficult-to-deform tin-bismuth alloy pre-formed soldering lug is realized. The manufacturing process for the pre-formed soldering lug can effectively solve the problems that a tin-bismuth alloy with intrinsic brittleness and difficult-to-deform characteristic easily generates material crack and the like in a large-deformation-amount processing process, and total deformation amount of the alloy can be 98% or more. The process is simple in flow, can greatly improve production efficiency of a tin-bismuth pre-formed lug,and reduces production energy consumption.

The invention discloses an ultra-low iron loss non-oriented silicon steel and a production method thereof. The production method comprises the steps that adopting molten iron desulfurization, converter smelting and RH furnace refining sequentially for steel smelting, and finally obtaining molten steel which comprises, by mass percent, smaller than or equal to 0.003% of C, 2.8%-3.4% of Si, 0.1%-0.5% of Mn, 0.6%-1.3% of Al, smaller than or equal to 0.0015% of S, smaller than or equal to 0.0020% of N, smaller than or equal to 0.03% of P, smaller than or equal to 0.003% of Ti, smaller than or equal to 0.003% of V and smaller than or equal to 0.003% of Nb, the sum of Si and Al is larger than or equal to 3.80% and smaller than or equal to 4.15%, and the balance of Fe and inevitable impurities; continuously casting molten steel obtained by smelting into a continuous casting blank; heating the continuous casting blank, and performing multi-pass rolling to obtain a hot-rolled coil plate; shearing the two side parts of the hot-rolled coil plate; carrying out normalizing pickling, wherein the normalizing temperature ranges from 900 DEG C to 930 DEG C, and the normalizing time ranges from 30 s to 60 s; and obtaining the non-oriented silicon steel with the thickness of 0.35-0.5 mm through multi-pass cold rolling, wherein the reduction rate during first-pass cold rolling is larger than or equal to 37%, and the rolling speed ranges from 70 m / min to 180 m / min. The non-oriented silicon steel prepared by the method has ultralow iron loss and is not easy to break during cold rolling.

The invention relates to a preparation method of heat conducting graphite paper. The method comprises the following steps: mixing crystalline flake graphite with a sulfuric acid solution to obtain a first mixture; adding potassium dichromate powder into the first mixture to obtain a second mixture; washing the second mixture by using water to obtain a prefabricated product; placing the prefabricated product in a chamber, vacuumizing the chamber firstly, then introducing inert gas into the chamber and performing high-temperature expansion treatment to obtain an expanded graphite material; and carrying out rolling on the expanded graphite material at least once to obtain the heat conducting graphite paper. The invention further provides the heat conducting graphite paper.

The invention discloses a high-end passenger ferry steel with a thickness below 12mm, C: 0.06%-0.09%, Si: 0.15%-0.30%, Mn: 1.40%-1.60%, P≤0.012%, S≤0.002%, Nb: 0.010%~030%, V: 0.030%~0.040%, Ti: 0.005%~0.020%, Cr: 0.20%~0.30%, Mo: 0.11%~0.17%, Al: 0.0250%~0.050%, O≤ 15ppm, N≤38ppm, H≤2ppm, does not contain Ni, Cu, and the balance is Fe and unavoidable impurities. Technical effect: The present invention develops high-end passenger ferry steel with a thickness of ≤12 mm at low cost and excellent plate shape within the chemical composition range of GB712 and the standards of the top ten classification societies. The steel type does not contain precious elements Ni and Cu. Contains a small amount of Mo and does not require high load on the rolling mill. It can be produced by general medium and heavy plate rolling mills. Therefore, it has wide applicability and is suitable for production by most domestic medium and heavy plate factories.

The invention belongs to the field of bearing steel heat treatment and particularly relates to an on-line rapid spheroidizing annealing method for hot-rolled GCr15 bearing steel. Aiming at solving the problems of excessively long spheroidizing time and the like in the traditional spheroidizing treatment process of GCr15 bearing steel, the rolling temperature is reasonably chosen, an optimal spheroidizing treatment process is adopted, and proeutectoid carbides in the rolling process are controlled to be separated out through deformation-induced transformation, so that time required for spheroidizing annealing is shortened, and the energy efficiency is improved. The on-line spheroidizing annealing method is adopted, and a relatively favorable spheroidized structure can be formed only within a relatively short follow-up spheroidizing treatment time. Through metallographic structure observation and analysis, spheroidized and annealed structures are fine grain ferrite and fine dispersed spherical carbide particles, the nodulization grade can reach 1 level, and the hardness is 200 HV and meets the use demands.

The present invention discloses an asphalt pavement hot in-place recycling layered heating method comprising the following steps: a pavement recycled material harrowed by heating is collected and mixed with new asphalt to obtain a regenerated mixture; the regenerated mixture is first put into a heating mixing device for the first time heating mixing, and then sent to another heating mixing device for second time heating mixing, the heating mixing is repeated for multiple times until the regenerated mixture is heated from original 70-80 DEG Cto 140-160 DEG C; and the mixed heated regenerated mixture is directly discharged, and received by a followed pavement paver, and the regenerated mixture is paved on a recycled pavement, and finally is compacted by a road roller. The temperature of the regenerated mixture heated by the regenerated mixture layered heating method is raised to 140-160 DEG C, the final paving rolling temperature is enhanced; and asphalt smoke dust and a large quantity of heat generated by the heating are recycled, and waste flue gas is reused after recycling combustion.

The invention relates to an economical thick-walled high-strength toughness X70M hot-rolled steel plate and a manufacturing method thereof. The chemical composition of the steel plate is calculated by weight percentage: C 0.045%-0.09%, Si 0.10%-0.35%, Mn 1.50%-1.85% , P≤0.01%, S≤0.015%, Nb 0.04%~0.09%, Ti 0.008%~0.0250%, Al 0.015%~0.045%, Cr 0.25%~0.5%, Cu 0.15%~0.55%, Zr 0.02%~ 0.04%, N 0.0041% to 0.006%, and the balance is Fe and unavoidable impurities; the steel plate of the present invention is suitable for manufacturing oil and gas transmission straight seam welded pipes with a pipe diameter of 25 to 38 mm in wall thickness, and solves the problem of rolling in the steel plate production process. It has high strength, high toughness and good comprehensive performance due to the problems of high resistance to resistance, high straightening resistance and poor uniformity of steel plate properties.

The invention discloses an ultra-thin hot-rolled narrow-strip steel production line and its supporting technology. A thermal insulation cover is installed on the steel-passing roller table from the second rough rolling mill to the first intermediate vertical rolling mill unit. The first intermediate rolling flat rolling mill and the second intermediate rolling vertical rolling mill are sequentially installed between the rolling mill unit and the second intermediate rolling flat rolling mill unit; The eighth finishing rolling flat rolling unit is installed between them. In the present invention, through the addition and modification of the main equipment and auxiliary facilities of the 3 / 4 continuous rolling mill production line, as well as the adjustment and optimization of the rolling line, billet, rolling temperature, rolling mill speed, roll matching system, etc., to achieve stable The purpose of producing ultra-thin hot-rolled narrow strip steel.

The invention provides a multi-field coupling roll finishing device for a conical surface. Multi-field coupling particularly means coupling of a high-temperature thermal field, a variable frequency pulsed magnet field and an ultrasonic field. The multi-field coupling roll finishing device comprises a rolling knife, an amplitude-change pole, a transducer, an ultrasonic generator, a thermocouple coil, a temperature controller, a pulsed magnet field intensifying system, a dynamometer and a mounting rack. A novel rolling knife structure is designed, so that different rolling wheels can be replacedaccording to different rolling workpieces, meanwhile, different rolling angles can be replaced according to different conical surface angles of workpieces, and accordingly, the use is convenient andreliable. According to the multi-field coupling roll finishing device, the heating temperatures of the workpieces can be controlled by a temperature controller, the rolling temperature of the workpieces is increased, and the atomic vitality of the workpieces is enhanced, dislocation movement is overcome, the resistance is reduced, and accordingly, a favorable rolling surface quality is acquired. The conical workpieces are placed in a pulsed magnet field acting region, so that the hardness and the wear resistance of the workpieces are improved. The value of a rolling force in a rolling processcan be monitored in real time by the dynamometer, and the rolling force in the rolling process is kept constant by feedback of a digital control system. An ultrasonic rolling system which can be mounted on a common lathe is designed to roll a conical-surface shaft part, the surface roughness of the part can be reduced, the surface hardness is improved, and favorable surface quality and mechanicalperformance are acquired.

The invention discloses a rolling technology of microalloy V-N steel. The austenitizing temperature ranges from 1200 DEG C to 1300 DEG C, and heat preservation time is 600s; the finish rolling temperature ranges from 900 DEG C to 950 DEG C; and the rolling deformation amount is controlled to range 30 percent to 40 percent, and air cooling is adopted after rolling. According to the rolling technology, the structure and the performance of the microalloy V-N steel are obviously improved.