48results about How to "Small amount of depression" patented technology

A Cu-Cr-Zr alloy thin strip preparation method based on sub-rapid solidification comprises the following steps that (1) Cu-Cr-Zr alloy melt is smelted according to design components, and the components comprise 0.5-1.5% of Cr, 0.1-0.2% of Zr and the balance Cu; (2) the smelted Cu-Cr-Zr alloy melt is poured into a tundish, the superheat temperature is controlled to be 50-100 DEG C, then the smeltedCu-Cr-Zr alloy melt is poured into a double-roller thin strip casting rolling machine, discharged from the rollers and subjected to water cooling in sequence; (3) multi-pass cold rolling is conducted, and the total reduction rate is 85-95%; and (4) aging treatment is conducted at the temperature of 350-500 DEG C. Due to the fact that molten metal can directly form an approximate finished thin strip, uniformized annealing, hot rolling and other technologies can be omitted through the method, the solid solubility of the Cr in the Cu is improved through sub-rapid solidification, segregation of the Cr and the Zr is effectively inhibited, the yield is increased, the cost is obviously reduced, after aging, the tensile strength is larger than or equal to 567 MPa, the electric conductivity is larger than or equal to 80% IACS, energy saving, emission reduction, technology simplification and production reduction are achieved, and meanwhile, the thin strip excellent in comprehensive performanceis finally obtained.

The invention discloses a production method with low energy consumption, 24 passes and high efficiency for hot rolling of a phi-8 coiled reinforced bar. The production method comprises four rolling mills for rough milling, six rolling mills for intermediate rolling, four rolling mills for finish rolling of bars and ten rolling mills for finish rolling of wires, wherein 1H to 3H racks roll by adopting a slotless form; 4V to 14V racks and No.15 to No. 24 racks roll by adopting a round / elliptical pass form; the 14V rack produces rolled pieces which are round bars of 24+ / -0.5mm; the pass width of the No.15 rack is 32.1-32.3mm, and the pass height is 16.15-16.30mm. According to the production method disclosed by the invention, by meticulously designing pass parameters of all the passes prior to the wire finish rolling mills for the hot rolling of the phi-8 coiled reinforced bar, and controlling the size and the precision of incoming bars for wire finish rolling, the safety of a motor of the wire finish rolling mill is guaranteed; the elongation percentage is reasonably distributed by the wire finish rolling racks, so that the phi-8 hot-rolled coiled reinforced bars are rolled on the 24 racks. Compared with a mode of rolling by 26 racks in the prior art, the mode disclosed by the invention has the advantages that the consumption of spare parts and the production energy consumption can be greatly reduced, and the production efficiency is improved.

The invention discloses a process for producing thin gauge pipeline steel by using a double-stand medium and heavy plate mill. A plate blank with the thickness of 180 mm is used for producing the thin gauge pipeline steel with the thickness less than 10 mm. On the basis that the performance of a rolled piece meets requirements, the thin gauge pipeline steel with a good plate shape can be obtained by controlling the tapping temperature of the plate blank, the rough rolling broadening pass pressing rate, the longitudinal rolling pass pressing rate after rough rolling broadening pass, the rough rolling finishing temperature, the thickness of a middle blank, the finish rolling ending pass pressing rate, the finish rolling finishing temperature, the roller gap inclination and sled function in the rolling process, a high pressure water descaling system, the water entry temperature, the re-reddening temperature, and the head and tail shielding and straightening process of a laminar cooling system. The deformation rate is reduced, and the economic benefit is increased.

The invention discloses a super-hard austenitic stainless steel and a preparation method thereof. The super-hard austenitic stainless steel comprises the following chemical components by weight percent: 0.08-0.13% of C, 0.3-1.0% of Si, less than 2.0% and greater than or equal to 0.5% of Mn, 16.5-17.5% of Cr, 6.5-7.5% of Ni, 0.03-0.08% of N, 0.5-0.8% of Mo, greater than or equal to 0.040% of P, greater than or equal to 0.01% of S, Fe and unavoidable impurities; the temperature of Md30 is 30-60 DEG C. By controlling the tempering and cold rolling reduction rate to 35-45%, controlling the rolling speed to less than or equal to 5m / s and the rolling temperature to less than or equal to 30 DEG C, the transformation from the austenite to the deformation martensite is created and the hardness of the material is greatly increased under the same deformation; when the tempering and cold-rolling reduction rate is 35%, the hardness HV is greater than 550 and the anisotropy of the super-hard state steel is reduced.

The invention provides hot-rolled narrow strip steel for fan blades, and belongs to the field of special steel. According to the hot-rolled narrow strip steel and the preparation method, the heating temperature of a uniform heating section is controlled in a narrow range, the heating time of the uniform heating section is prolonged, the temperature uniformity of a casting blank is improved, the temperature difference in and outside the blank body is reduced, and the phenomena of bending and twisting of rolled pieces in the rolling process are avoided; the bouncing value of a rolling mill is reduced, the stability of the rolling process is improved, the finish rolling roller diameter difference is strictly controlled and the roller diameter of the finish rolling working roller is standardized, the roller diameter is arranged from large to small, the contact arc length of the small-diameter working roller and the rolled material is short, the rolling force, the friction force and the torque can be greatly reduced, and the rolling precision is improved. The data of the embodiment show that the product prepared by the method is high in dimensional precision, the AB difference is less than or equal to 0.01 mm, the three-point difference is less than or equal to 0.03 mm, the strip difference is less than or equal to 0.04 mm, the production requirements of fan blades can be met, the cost is not increased compared with the conventional production process, meanwhile, the implementation difficulty is low, and the method has extremely high generalization performance.

The invention discloses a method for rolling a thin high-strength steel plate of a single-frame steckel mill. The method comprises the following steps: producing the finished product of a high-strength steel plate with a thickness less than 10 millimeters by using a blank with the thickness of 150 millimeters and the length more than 10 meters; and then acquiring the thin high-strength steel plate with qualified property and plate shape by controlling a tapping temperature, a coiler furnace temperature, a reduction in last pass, a roller force, a final rolling speed and a high pressure water de-scaling system. When the rolling method is used for producing the thin steel plate, the thin high-strength steel plate is rolled by utilizing the heat preservation function of front and back mill coiler furnaces and controlling the tapping temperature of the blank, the reduction in the last rolling pass, the roller force and the final rolling speed, and the acquired plate shape and property of the steel plate are both qualified, thereby increasing the rolling mill capacity and achieving high plate yield and high property yield.

The invention discloses a control method of a hot rolling roughing mill. The method comprises the steps that a board blank enters a rough rolling area, load distribution of a slip pass is optimized again, and the board blank rolling reduction of the slip pass is reduced; the set value of rolling force of a roughing mill vertical roll of the board blank is adjusted, and the holding force is increased; the speed of the roughing mill vertical roll and a roller way when the board blank is gripped is adjusted, and the conveying speed is increased; and descaling water of the current pass of the board blank is eliminated, wherein the steel gripping signal of the roughing mill is judgment of rolling force at the moment of steel gripping. The technical problem that due to the slip phenomenon of a board blank in a roughing mill in the prior art, the board blank cannot be normally gripped, and accordingly normal production rhythm is affected is solved. The technical effect that rapid response isachieved when the board blank slides while being gripped in the roughing mill, the production accidents of board blank abandoning and rollback are avoided, and the production efficiency is improved are achieved.

The invention discloses a forming method of a copper / aluminum composite material with high interface bonding strength, belonging to the technical field of metal layered composite material preparation. This forming method processes the surface to be compounded of the copper plate and the aluminum plate to obtain a macroscopic uneven surface to be compounded, and uses a louver to polish the compounded surface. The direction of the stripes formed by grinding is perpendicular to the rolling direction, and then the copper plate and the Aluminum plates are stacked up and down or side by side to obtain copper / aluminum billets, followed by single-pass low-pressure cold rolling pre-compounding, then high-temperature short-term heating, and finally single-pass hot rolling final compounding to obtain high interface bonding Strong copper / aluminum composite. The invention has the advantages of low requirement on the capacity of the rolling mill required to produce the copper / aluminum composite material, simple process, and low production cost, and can obtain a macroscopic composite interface of a non-straight artificial structure and a microscopic composite interface of a particle pinning structure, and the interface is combined The strength is greater than or equal to 90MPa, and the range of applicable copper / aluminum composite materials is wide, which is easy for industrial promotion.

The invention provides a hot rolled narrow strip used for a stamping part, a preparation method and an application and belongs to the technical field of metallurgy. The prep ration method comprises the following steps: successively conducting heating, a first dephosphorization, roughing, a second dephosphorization, finish rolling and winding a casting blank so as to obtain a hot rolled narrow strip used for a stamping part. For the hot rolled narrow strip provided by the invention, the AB difference is less than or equal to 0.01mm; the difference of three points is less than or equal to 0.03mm; the difference of a cleaning rod is less than or equal to 0.04mm; the thickness of a sinter is less than or equal to 7 microns; the yield strength is 258-285MPa; the tensile strength is 364-385MPa;the percentage elongation after fracture is 44.0-46.0%, so the hot rolled narrow strip can meet the production demand of the stamping part; compared with a conventional production process, the cost isnot increased; meanwhile, with small implementation difficulty, the invention has high generalizability.

The invention belongs to the technical field of aluminum alloys, in particular to an ultra-wide aluminum alloy plate and a preparation method thereof. The invention carries out ultrasonic treatment in the hot rolling process, continuously injects vacancies into the material through ultrasonic vibration, so that the material dynamically precipitates a large number of fine and dispersed nano-precipitated phases, and adds a pre-stretching process before solution treatment to reduce the aluminum alloy The residual internal stress of the plate improves the strength and elongation of the aluminum alloy plate, and the produced aluminum alloy plate has stable performance, high surface smoothness, low residual internal stress of the plate, and the plate is not easily deformed during machining.