385results about How to "Improve heat treatment effect" patented technology

The invention discloses a process for preparing Cu-Cr-Zr alloys applicable to contact lines. The process comprises the following steps that alloys comprising 0.30 to 0.50 percent of Cu, 0.10 to 0.15 percent of Cr, 0.01 to 0.02 percent of Zr and Si are melt in a vacuum induction furnace, wherein alloy elements, namely Cr, Zr and Si, are added by master alloys; fine casting-state crystal grains and oversaturated matrix tissues having secondary dendritic crystal spaces are obtained by controlling solidification velocity and cooling velocity; rolling in fit, drawing deformation and annealing thermal treatment to the fine casting-state crystal grains and oversaturated matrix tissues are carried out so as to control deformation degrees and parameters for the thermal treatment; and the strain-hardening effect and the precipitation strengthening effect are organically combined. Therefore, the alloys have the advantages of excellent tensile strength, electrical conductivity and high-temperature resistant softening capacity and lower cost under the conditions of simplified process and the simpler apparatus and components, and are applicable to industrial production.

The invention relates to thermal treatment equipment and specifically relates to quenching equipment for completing quenching, isothermal treatment or tempering in the same slot by transferring through a hanging basket. The quenching equipment comprises a heating furnace, a discharging table, a quenching slot, an isothermal slot, an air-cooling slot, a saline water cleaning slot, a clear water cleaning slot and an unloading table, wherein the quenching slot, the isothermal slot, the air-cooling slot, the saline water cleaning slot and the clear water cleaning slot are arranged between the discharging table and the unloading table in sequence; the quenching slot and the isothermal slot are formed by dividing a liquid-connected large slot through an adjustable baffle plate; a transfer mechanical hand is arranged above the discharging table and the unloading table; a material taking hook of the transfer mechanical hand is equipped with the hanging basket for hanging and transferring workpieces. The quenching equipment disclosed by the invention can sufficiently utilize heat energy and lower thermal treatment process cost; by adopting a mode that liquid transfers heat for workpieces, tempering and isothermal temperatures of workpieces are more uniform, and better thermal treatment effect is obtained; the mechanical hand can realize automatic transfer of workpieces in different working media, and can realize various quenching processes.

The invention discloses a high-strength aluminum alloy subjected to carbonitride complex treatment and a preparation method thereof. The alloy comprises the following components in percentage by weight: 2.0-3.2 percent of Cu, less than or equal to 0.2 percent of Mn, 0.2-0.5 percent of Mg, less than or equal to 0.01 percent of Cr, less than or equal to 0.01 percent of Ni, less than or equal to 0.1 percent of Zn, less than or equal to 0.15 percent of Ti, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Fe, and the balance of Al and inevitable trace impurities, wherein the carbonitride MX(C,N)Y is 0.05-2.5 percent of total mass of the furnace burden. The aluminum alloy has the characteristics of high strength and good casting performance.

The invention discloses a Ni based-flux-cored wire. The Ni based-flux-cored wire comprises a flux core and a welding scale, wherein the flux core is prepared from the following components in percentage by mass: 86%-90% of Ni powder, 3%-5% of Mn powder, 6%-7% of Si powder, the balance of Cu powder, and the sum of the mass percentage of the components is 100%. The Ni based-flux-cored wire is used asa transition layer to avoid welding defects caused by thermophysical parameter difference of two types of materials during direction connection of copper-steel. The invention further provides a method for preparing copper-steel base gradient composite based on the Ni based-flux-cored wire used as the transition layer. The problem of the welding defects caused by direct connection in existing copper/steel composite is solved, parts can be combined from the steel side to the copper side to reach a gradient mode, so that the combining capacity of a heterogeneous material interface is enhanced, and the mechanical properties of composite members are improved.

The invention discloses a spray cooling device for long steel rail online quenching unit. The spray cooling device for long steel rail online quenching unit comprises a strong cooling region and a weak cooling region which are arranged in a quenching unit with the length of 75-125m from front to back, wherein the front part of the quenching unit accounting for one third to one second for the quenching unit is the strong cooling region, an water mist atomizing mode is adopted in the strong cooling region; the back part of the quenching unit accounting for one second to two thirds for the quenching unit is the weak cooling region, an air jetting mode or a mode of blowing compressed air which is humidified in a header pipe or a branch pipe of a ventilation pipeline is adopted in the weak cooling region, and each cooling segment has the length of 1.2-4.5m, is adapted to a distance between two straightened guide rollers and is formed by four cooling units. With the adoption of the spray cooling device, cooling quenching is carried out on the end surface and the two side surfaces of a rail head of a steel rail A and also on the rail bottom below the steel rail A correspondingly, aiming to balance the deformation of the steel rail caused by shrinkage and phase transition during rail head quenching; the steel rail keeps a straight state as much as possible in the quenching process, and the residual stress is weakened. The spray cooling device can be used for effectively controlling the organization and performance of the steel rail within a larger range so as to reach the best heat treatment effect.

The invention discloses a blank-making rolling method for a synchronous sliding sleeve of an automotive transmission using circular steel as a blank material. The method comprises the steps of cutting, heating, upsetting, punching a blind hole and pre-forming, punching a wad and pressing an end face, performing ring rolling forming, shaping, normalizing, performing impeller blasting and the like, wherein the key point is that a rolling wheel used in the step of the ring rolling forming is provided with an annular groove corresponding to a blank of the synchronous sliding sleeve of the automotive transmission. By applying ring rolling process to the blank of the synchronous sliding sleeve of the transmission, the subsequent machining amount is reduced to the greatest extent, the material consumption is reduced and the service life of the finished product is prolonged.

The invention relates to a heating processing technology of a wear-resistant cutting board, in which a shaped wear-resistant cutting board workpiece is preheated, heated under high temperature, and then is subjected to high-strength quenching and tempering. The technology comprises the following steps: A. preheating: the preheating temperature is 450-550 DEG C, and the preheating time is 0.5-1.125min/mm; B. high temperature heating: the temperature is 870-890 DEG C, and the holding time is 0.5-1.125min/mm; C. high-strength quenching: whole spray water time of high-strength quenching is 70-700 seconds, and time in intensified spray is 15-20 seconds; D. tempering: low temperature tempering is carried out, followed by air cooling to room temperature; high pressure cooling water used in the invention is recyclable. The invention has the advantages of making full use of reasonable heating processing technology under the premise of ensuring fine property of the wear-resistant cutting board, improving production efficiency and saving energy consumption, thus lowering production cost of the wear-resistant cutting board.

The invention discloses a corrosion resistant metal coating for a gear box inner surface. The corrosion resistant metal coating comprises the following components by mass percentage: 0.03-0.05% of C, 0.45-0.48% of Mn, 12.76-12.79% of Cr, 6.12-6.15% of Ni, 0.16-0.18% of Mg, 0.22-0.25% of Mo, 0.27-0.29% of Co, 0.26-0.28% of V, 0.22-0.24% of Ti, 0.21-0.23% of Na, 0.12-0.15% of Ga, 0.32-0.35% of Eu, 0.12-0.14% of Lu, 0.62-0.68% of La, and the balance Fe.

The invention relates to the technical field of metallurgy, in particular to steel for bucket teeth and a preparation method thereof. The steel comprises the following chemical components in percentage by mass: 0.30-0.34% of C, 1.30-1.50% of Si, 0.80-1.10% of Mn, equal to or less than 0.025% of P, equal to or less than 0.025% of S, 1.50-1.70% of Cr, 0.06-0.08% of Ti, 0.10-0.18% of Mo, 0.020-0.050%of Al, equal to or less than 1.5*10% of H, equal to or less than 80*10% of N, equal to or less than 1.5*10% of T.O and the balance of Fe and unavoidable impurities. The preparation method comprises the following steps: 1, electric furnace smelting; 2, refining furnace smelting; 3, VD furnace vacuum smelting; 4, continuous casting; and 5, rolling. The steel is excellent in macrostructure, high inpurity, low in gas content, fine and small in crystal particle, compact in texture, low in banded structure grade, and high in mechanical property and improves the technological processability and thermal treatment of a material.

The invention relates to a wear-resisting low-carbon steel shot, a preparation method thereof and a centrifugal atomizing device, and belongs to the technical field of metal abrasives. The wear-resisting low-carbon steel shot consists of the following chemical components in percentage by mass: 0.1-0.3% of C, 0.2-1.0% of Si, 0.3-1.2% of Mn, 0-0.05% of S, 0-0.05% of P, 0.1-0.2% of Ti, 0.07-0.2% of Mo, 0.1-0.2% of V, 0.1-1.1% of Cr and the balance of Fe. The preparation method comprises the following steps: smelting, centrifugal atomizing and forming, drying, coarse screening, quenching and tempering. The centrifugal atomizing device comprises a water storage tank, a centrifugal rotary plate and a centrifugal atomizing tank, wherein the centrifugal atomizing tank sequentially passes through a water outlet pump, the water storage tank and a water inlet pump to form a circulating loop; the upper part of the centrifugal atomizing tank is provided with a centrifugal rotary plate; and the top of the centrifugal atomizing tank is provided with ring-shaped water slots which are distributed along the circumference. The wear-resisting low-carbon steel shot has the characteristics of impact resistance, high cleaning efficiency and fatigue resistance, and has wear-resisting times up to 3500-3600 times; the preparation method is simple and good in thermal treatment effect; and the used centrifugal atomizing device is simple in structure, low in cost and easy to realize.

The invention discloses a sheet carbonizing method, comprising the following steps of: a) a sheet drying process; b) a first rapid heating stage; c) a first heat preservation stage; d) a humidification and heat preservation stage; e) a second rapid heating stage; f) a second heat preservation stage; and g) a rapid cooling stage; reducing the temperature inside a carbonizing kiln to 130-140 DEG C, then naturally cooling to 40 DEG C or less, and drawing. The sheet carbonizing method disclosed by the invention is high in production efficiency, good in thermal treatment effect, excellent in stability, and even in wood color; the loss of the mechanical property of the sheet in the carbonizing process can be reduced to the minimal degree; and the sheet does not easily crack or deform.

The invention discloses a blackening furnace. The blackening furnace comprises a furnace cover (1), a furnace wall (2), a base (3), a lifting cylinder (5) and a rocker arm (6), wherein the furnace cover (1), the furnace wall (2) and the base (3) enclose to form a furnace chamber (4); the piston rod of the lifting cylinder (5) is connected with the outer end of the rocker arm (6); the inner end of the rocker arm (6) is fixed with the furnace cover (1); the cylinder wall of the lifting cylinder (5) is fixed with the furnace wall (2); a horizontal annular groove is formed in the inner wall of the furnace wall (2); a self-locking ring which can rotate along the circumferential direction of the annular groove is arranged in the annular groove; a second cylinder used for rotating the self-locking ring is arranged on the self-locking ring; a radially outwards-convex bump is arranged on the outer circumferential surface of the furnace cover (1); and a radially inwards-concave locking block used for rotationally locking the bump is arranged on the inner circumferential surface of the self-locking ring. The blackening furnace can be opened or locked conveniently and rapidly; and moreover, the air pressure in a furnace chamber can be improved.

The invention discloses a spring steel wire heating, winding and cooling conveying device, relates to equipment used for manufacturing springs, in particular to equipment used for manufacturing springs by heating, conveying and winding steel wires and then conveying the springs. The spring steel wire heating, winding and cooling conveying device comprises a spring winding machine (1), a heating mechanism (2) and a spring cooling conveying mechanism (9), and is characterized in that the spring cooling conveying mechanism (9) comprises an annular conveying mechanism (11), wherein a plurality of magnetic attracting blocks (10) are installed on the annular conveying mechanism (11). The spring steel wire heating, winding and cooling conveying device can automatically convey and cool the springs, does not need manual operation, not only is high in efficiency, but also avoids safety risks.

The invention discloses a corrosion-resistant metal coating used for the outer surface of a gear box. The corrosion-resistant metal coating comprises, by mass, 0.06%-0.08% of C, 0.15%-0.18% of Mn, 10.76%-10.79% of Cr, 2.12%-2.15% of Ni, 0.13%-0.15% of Mg, 0.21%-0.23% of Mo, 0.25%-0.27% of Co, 0.06%-0.08% of V, 0.42%-0.44% of Ti, 0.22%-0.25% of Na, 0.17%-0.19% of Ga, 0.22%-0.25% of Ce, 0.16%-0.18% of Nd, 0.32%-0.38% of La and the balance Fe.

A method for realizing anti-shrinkage recarburization sludge drying is characterized in that an organic pore-forming agent and a catalyst are added into a sludge dry basis subjected to centrifugal dewatering to be uniformly mixed, distributing is carried out in a solar power interlayer drying system, and through the organic combination of the synergistic effect of framework construction and the pore-forming agent and solar power drying, a low-shrinkage recarburization function on the basis of realizing quick sludge drying is realized, wherein the organic pore-forming agent comprises 50-80% of a pore-forming agent and 20-50% of an aggregate according to the mass ratio; the pore-forming agent is prepared by mixing one or more of natural fibers such as starch, saw dust, sawdust and crop stalks according to an arbitrary ratio; the aggregate is prepared by mixing one or more of high-molecular polymers such as polyvinyl chloride, polystyrene, polyvinyl alcohol and resin according to an arbitrary ratio; the catalyst is the KOH solution with the concentration of greater than or equal to 0.4 mol/L, and the mass ratio of the catalyst to the organic pore-forming agent is 1:1, and the adding amount of the organic pore-forming agent is 5-30% of that of the sludge dry basis. According to the method, the dried sludge size is reduced, and when the sludge moisture content is less than 20%, the dried sludge size is reduced to 16.4-52.2% of the original size of sludge; after pyrolysis, the carbon recovery rate is increased by 20-30%, and BET is increased by 40-120%.

The invention discloses a lacquer dipping technique of a lacquer-covering copper strap wire, relates to the lacquer dipping techniques of the lacquer-covering copper strap wire, and comprises following steps: a copper strap wire is transmitted into an annealing furnace at the speed of 6 to 8 meters per minute, the temperature of the annealing furnace is controlled between 480 and 520 DEG C, and heating stroke lasts for 8 to 10 meters; then the copper strap wire is cooled to the temperature of 20 to 40 DEG C; the lacquer dipping of the copper strap wire is implemented at the speed of 6 to 8 meters per minute; then the copper strap wire is heated, a heating device with three levels of heaters is provided, the temperature of the three levels of heaters are respectively controlled at 160 to 200 DEG C, 230 to 270 DEG C and 300 to 350 DEG C, and the copper strap wire orderly passes through the three temperature regions and then through a cooling device that is arranged at an upper part of the heating furnace; finally the copper strap wire is cooled naturally and then stored. The lacquer dipping steps are repeated for 6 to 10 times. The heating furnace of the invention has three levels of heaters and the temperature gradually is raised, the copper strap wire orderly passes the three heating regions and then is cooled, consequently, the copper strap wire that is thermally processed by the lacquer dipping technique has good quality effect.

The invention discloses a low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material. The low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material comprises the following chemical components in percentage by mass: 0.18-0.23% of C, 0.15-0.23% of Si, 0.50-0.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.05% of S, 0.010-0.030% of Al, 0.80-1.00% of Cr, 0.20-0.30% of Mn, 0.0015-0.0020% of Ca, less than or equal to 0.03% of La and the balance of matrix Fe and impurity elements. The invention also discloses a production method of the low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material. The low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material has the advantages of relatively low cost, good plasticity, low crack sensitivity, low residual stress, good hardenability, stable performance and relatively high percentage of elongation.