19 results about "Stellite alloy" patented technology

The invention provides a method for preparing a fine-grain stellite alloy plate through vertical reducing hot rolling. Compared with a traditional symmetric rolling process, the preparation method adopts a vertical reducing deformation hot rolling process, rolling cracks of the stellite alloy plate are eliminated, additional shear strain is introduced in the thickness direction of the stellite alloy plate through reducing rollers and the linear velocity difference of the reducing rollers, more uniform plastic flow in the material is promoted, and the stellite alloy plate is prepared. And the problem of uneven surface and core deformation in traditional symmetric rolling is relieved, and the crack risk caused by local stress concentration is reduced. And meanwhile, the deformation uniformity in the rolling process is improved, grains of the stellite plate are refined, residual stress is reduced, the surface quality of the plate is improved, rolling force is reduced, passes are reduced, and the service life of the roller is prolonged.

The utility model provides a novel plug valve, and relates to the technical field of valves. Comprising a valve seat made of PEEK or stainless steel materials, and a cock is arranged in the valve seat. A lining is fixedly nested in the valve seat; the lining is located on the periphery of the rotary plug. A 2507 stainless steel sealing cover is arranged at the upper end of the valve seat; the upper end of the valve rod penetrates through the sealing cover, the middle of the valve rod is in sealing connection with the sealing cover, and the lower end of the valve rod is connected with the cock; and the sealing surface of the sealing cover is made of stellite alloy steel. A cavity is eliminated through the lining, crystal accumulation is avoided, two-way sealing supports any flow direction, materials are resistant to corrosion and high temperature, the problem of urea crystal accumulation in the ammonium carbamate solution environment is avoided, and normal operation of the valve is guaranteed.

The application relates to a method for realizing automatic welding of hard alloy surfacing of a special-shaped bushing of a steam turbine main steam valve assembly, and relates to the technical field of automatic welding. The application aims to solve the problems of complex welding procedures of surfacing stellite alloy on the bushing of the steam turbine main steam valve and poor weld consistency and easy welding defects of the surfacing stellite alloy on the bushing of the steam turbine main steam valve by manual argon arc welding. In order to solve the problems in the prior art, improve work efficiency and ensure quality, the special-shaped bushing of the steam turbine main steam valve assembly is welded by plasma spray welding, the position requiring surfacing stellite products is welded and processed in a reasonable sequence according to the advantages of small heating of a plasma spray welding base body, small deformation of a part, stable process, dense coating and high bonding strength, so as to improve production efficiency and reduce cost. The application can realize automatic welding of hard alloy surfacing of the special-shaped bushing of the steam turbine main steam valve assembly.

The utility model discloses a recirculation minimum flow valve for a feed pump, which comprises a valve casing, the upper end of the inner cavity of the valve casing is fixedly connected with a valve seat, the bottom of the inner cavity of the valve seat is fixedly connected with an annular sealing seat, the top of the annular sealing seat is fixedly connected with a first stellite alloy ring and a second stellite alloy ring in sequence from outside to inside, and the first stellite alloy ring and the second stellite alloy ring are fixedly connected with the valve casing. And the upper end of the inner cavity of the valve seat is movably connected with an adjusting column. Under the matching action of the valve rod, the valve shell, the adjusting column, the main valve element, the pressure applying spring, the auxiliary valve element, the second wedge-shaped groove, the annular sealing seat, the second stellite alloy ring, the first wedge-shaped groove, the first stellite alloy ring and the valve seat, the dual-sealing effect can be achieved in the valve closing process; and the first stellite alloy ring and the second stellite alloy ring have good abrasion resistance, so that the surface damage can be avoided under the long-time impact erosion of water flow, and the sealing performance of the whole long-term use is ensured.

The embodiment of the invention provides a preparation method of sulfuration-corrosion-resistant nano copper sulfide coated ZrN ceramic. The preparation method comprises the following steps: providing nano copper powder, ZrN powder and high-purity carbon powder; filling sulfur oxide gas into the nano copper powder; respectively adding the ZrN powder and the high-purity carbon powder into the nano copper powder, and carrying out argon-filled ball-milling powder mixing and vacuumizing to obtain mixed powder; and carrying out vacuum pressure sintering on the mixed powder, and cooling to obtain the nano copper sulfide coated ZrN ceramic. The process for preparing the nano copper sulphide coated ZrN ceramic is simple, and the production cost per kilogram is only 45-56% of that of a stellite alloy, so that the production cost can be remarkably saved. The prepared nano copper sulfide coated ZrN ceramic is compact in structure, excellent in sulfuration corrosion resistance and obviously high in cost performance, and it is possible to replace currently-used expensive Stelforce alloy.

A manufacturing method for composite welding of high-thickness Stellite alloy on the end face of irregularly shaped bushings with the inner circle is disclosed, relating to the field of high-thickness Stellite alloy welding manufacturing technology. This method addresses the problems of inconsistent fusion quality at the root of the groove on the end face of irregularly shaped bushings during the formation of a Stellite alloy wear-resistant layer on the end face and inner circle using traditional welding processes, which also pose risks of burn-through due to collisions between the welded parts and the welding torch, resulting in long manufacturing cycles. The method eliminates the end face groove structure required for automated TIG welding of the inner wall in traditional processes, and also eliminates the nickel-based transition layer welding step. This transforms the complex traditional route of "groove processing—nickel-based transition layer welding—heat treatment—intermediate processing—Stellite welding" into a composite process of "direct plasma spraying on the end face—heat treatment—intermediate processing—inner circle spraying—heat treatment—final processing," significantly reducing the number of processes and intermediate handling steps, thus shortening the manufacturing cycle. This invention is applicable to the field of welding manufacturing technology.

The embodiment of the utility model provides a stellite alloy sheet forming tool, and relates to the technical field of forming devices. The stellite alloy sheet forming tool comprises a base, four guide shafts arranged on the upper surface of the base and a lifting platform installed between the guide shafts in a sliding mode. The stellite alloy sheet forming tool further comprises a lower die installed on the upper surface of the base and an upper die installed on the lower surface of the lifting platform. An air hole is formed in the lower mold, an air supply channel communicated with the air hole is further formed in the lower mold, and the air supply channel is connected with an air source; the device further comprises a blocking mechanism used for blocking the air holes. According to the stellite alloy sheet forming tool, the automatic demolding function is achieved, the demolding difficulty is remarkably reduced, and the production efficiency and the workpiece surface quality are improved. Meanwhile, due to the design of the blocking mechanism, materials are effectively prevented from entering the air hole or the air supply channel in the pressing process, and the reliability and the service life of the mold are guaranteed.

This invention provides a BN-reinforced high-entropy alloy composite coating and its preparation method, relating to the field of surface strengthening. The preparation method includes: ball milling of B powder, including ball milling while simultaneously filling the milling jar with high-temperature nitrogen; mixed ball milling, where Al powder, Cr powder, Fe powder, and Ni powder are loaded into the milling jar and dry-milled to obtain a mixed powder; preheating of the substrate; laser cladding: loading the mixed powder into a powder feeder, then sealing the feeder and filling it with a powder-feeding gas and a protective gas, setting various laser cladding parameters, performing laser cladding every 3-5 passes to form a cladding cycle, and performing n cladding cycles; and cooling. The BN-reinforced high-entropy alloy composite coating prepared by this method exhibits a nearly 50% or even more reduction in high-temperature oxidative wear volume loss compared to commonly used Stellite alloy coatings, while the material cost is only about 75%-80% of that of Stellite alloy coatings. In other words, it offers better wear resistance and lower cost, providing a potential alternative to Stellite alloy coatings.

The invention discloses a stellite alloy rolling parameter self-adaptive optimization method based on deep learning, and belongs to the technical field of automatic plate shape control of metal plate rolling. The method comprises the following steps: firstly, converting an acquired thickness difference distribution curve into a two-dimensional grayscale image, and extracting features and quantifying taper deviation trend intensity by using a convolutional neural network; when the strength exceeds the threshold value, the deformation resistance fluctuation type is identified through a classification model, and a nonlinear coupling influence coefficient is calculated. And then, based on the coefficient, fusing data of a lateral force sensor, determining optimized rolling reduction distribution along the plate width direction, and solving a real-time inclination angle correction value by adopting an optimized search algorithm in combination with a historical inclination angle sequence. And finally, predicting the deviation risk of the next pass according to the index of the current pass, and implementing preventive parameter fine adjustment. According to the method, real-time sensing, coupling relation decoupling and prospective control of the transverse thickness unevenness are achieved, and the thickness uniformity of the plate is remarkably improved.

The invention provides a method for improving corrosion resistance and crack resistance of an alloy patch on the surface of a low-pressure last-stage blade of a steam turbine based on a nickel-based metal connecting layer, which comprises the following steps of: arranging the nickel-based metal connecting layer between a stainless steel base material and the alloy patch, and connecting the base material and the alloy patch through an instantaneous liquid phase welding process; and then the connecting piece is subjected to diffusion annealing treatment, and the required low-pressure last-stage blade of the steam turbine is obtained. Wherein the alloy patch is made of a modified stellite alloy, and the content of the element B in the stellite alloy is not lower than 0.5 wt%; the nickel-based metal connecting layer is designed in a composite structure and is composed of a first BNi-2 layer, a pure Ni layer and a second BNi-2 layer in sequence. Wherein the pure Ni layer serves as a middle barrier layer, and the first BNi-2 layer and the second BNi-2 layer are separated on the two sides. Through the synergistic effect of material component design and welding process regulation and control, high-quality combination of the alloy patch and the base material is achieved, and meanwhile the microstructure in the stellite alloy is optimized so as to improve corrosion resistance.

The application relates to the technical field of valve repairing, in particular to a valve sealing surface repairing method and device, which comprises the following steps: turning the surface of a valve core and a valve seat; detecting whether the valve core and the valve seat are damaged by using PT nondestructive testing, and if the valve core and the valve seat are damaged, the damaged parts are continuously turned; performing surfacing treatment on the turned parts; detecting whether the surfacing parts are damaged; turning the surfacing parts; adopting Stellite alloy as cladding material to perform laser cladding; after the laser cladding, detecting whether the valve core and the valve seat have pores, sand eyes, cracks and uncombined areas by using PT nondestructive testing; finely grinding the surface of the valve core and the valve seat; and grinding the sealing surface by using a grinding device. After the valve core and the valve seat are repaired, the valve core and the valve seat have good wear resistance, heat resistance and corrosion resistance, the strength of the combined surface is high, and the service life is long.

The invention provides a composite reinforced stellite alloy STL 6B for a large shield tunneling machine as well as a preparation method and application of the composite reinforced stellite alloy STL 6B. The stellite alloy STL 6B comprises the following components in percentage by weight: 0.9 to 1.8 percent of C, 27.0 to 33.0 percent of Cr, 3.0 to 6.0 percent of W, 0.5 to 2.0 percent of Mo, 1.0 to 4.0 percent of Ni, 0.2 to 2.0 percent of Si, 0.50 to 2.0 percent of Mn, 0.001 to 0.1 percent of N + B, 0.001 to 0.05 percent of Y, less than or equal to 5.0 percent of Fe, less than or equal to 0.50 percent of Al, less than or equal to 0.50 percent of Ti, less than or equal to 0.015 percent of P, less than or equal to 0.001 percent of S and the balance of Co. Through collaborative optimization of all the elements, the functions of high abrasion resistance, corrosion resistance and excellent mechanical property of the STL 6B alloy material are achieved, and the STL 6B alloy material can become an ideal material for key abrasion-resistant and long-service-life components in a large shield tunneling machine.

The invention discloses an ultra-small-hole stellite alloy low-dilution efficient laser automatic welding method which comprises the following steps: clamping a workpiece to be welded on a linkage rotary positioner, and introducing inert gas for protection; low-power swing laser preheating is adopted; enabling the workpiece to rotate at an approximate flat welding position, carrying out spiral lap-joint surfacing by utilizing swinging laser, and synchronously and accurately feeding a stellite alloy welding wire; carrying out slow cooling treatment after welding; machining the surfacing layer to accurately control the thickness and components; and the surfacing and machining cycles are repeated until the total thickness reaches the standard. Through the synergistic effect of laser swinging, workpiece rotating, synchronous wire feeding and gas protection and in combination with intermediate machining, the defects that the manual welding quality is unstable and laser cladding powder feeding is difficult are overcome successfully, full automation of deep small hole surfacing is achieved, a high-quality surfacing layer which is low in dilution rate, free of defects and controllable in hardness is obtained, and the production efficiency is improved. And the welding efficiency and reliability are obviously improved.

The utility model relates to the technical field of metal deformation processing, in particular to an embedded tungsten / molybdenum bar forging die which comprises a die body, the die body is formed by splicing two die base bodies, one end face of each die base body is provided with an arc-shaped groove, and the other end face of each die base body is provided with an arc-shaped groove. The two arc-shaped grooves form a closed working die hole in the center position of the die main body, and the working die hole is divided into a sizing area, a reducing area and an inlet area from inside to outside; a mold insert is embedded in the mold base body, an arc-shaped surface is arranged on the upper surface of the mold insert, and the arc-shaped surface coincides with the arc-shaped groove surface of the mold base body and has the same radian as the arc-shaped groove surface of the mold base body; the mold insert is made of stellite alloy, and the mold base body is made of 40Cr steel or H13 steel. According to the utility model, the die base body and the die insert are made of materials with different prices, so that the manufacturing cost is reduced on the basis of ensuring the service life of the die, and the surface of a forged bar is smoother.

The method for surfacing stellite alloy on the cartridge receiver comprises the steps that a conical shape from the tail end of a tungsten electrode of an electrode part material to a round head is polished, the part is cleaned through ultrasonic waves, and then a boundary line of an area to be welded is marked out along a tool notch; pre-welding preheating is conducted on the part, meanwhile, all welding seams are grouped, and welding is conducted in a symmetrical sequence; setting a welding current, and surfacing a frame on the boundary of the delimited to-be-welded area; performing surfacing of a base layer in the frame, and performing surfacing of a filling layer and a covering layer after cooling; after surfacing, the part and the test plate are subjected to heat preservation stress relief heat treatment together, and the hardness of the workpiece is evaluated by detecting the hardness of a surfacing layer of the test plate. The process is stable, the problems of many internal defects and low hardness qualification rate after welding are solved, and the method can be applied to surfacing of stellite alloy on cases of various models.

This invention provides a Stellite alloy coating and its preparation method, relating to the field of surface engineering. The preparation method includes: preheating and holding: placing the original Stellite alloy coating and its substrate in a vacuum furnace for preheating to 100–300°C and holding at that temperature, with the coating thickness to substrate thickness ratio being the thickness ratio, and the holding time being positively correlated with the thickness ratio; semi-remelting and solidification: using a temperature 20%–35% of the melting point of the Stellite alloy as the remelting temperature, remelting the coating surface and waiting for the melt to solidify; after the first pass of semi-remelting and solidification is completed and the coating cools to 100–300°C, N more passes of semi-remelting and solidification are performed, where N is a natural number, 0 ≤ N ≤ 5; cooling: after all passes of semi-remelting and solidification are completed, the coating is cooled to room temperature to obtain the Stellite alloy coating. This preparation method results in finer grains in the Stellite alloy coating, better adhesion to the substrate, reduced weight loss by more than half under abrasion, and significantly improved abrasion resistance.

The embodiment of the utility model provides stellite alloy heat treatment equipment, which relates to the technical field of material processing engineering and comprises a machine body, a heating element, a top cover, a plurality of hook type material racks and a plurality of assembly mechanisms, the heating element is installed on the inner wall of the machine body, the top cover is connected with the top of the machine body in a sealed mode, the hook type material frames are arranged at the bottom of the top cover, the assembling mechanisms are arranged at the bottom of the top cover, and the assembling mechanisms are used for fixing the hook type material frames. An operator hangs the stellite alloy workpieces on the hooks of the hook type material frame one by one, then the hook type material frame is fixed through the assembling mechanism, the hook type material frames of different specifications and multiple sets of hook type material frames can be installed in a matched mode, and the compatibility and flexibility of equipment for treating diversified workpieces are greatly improved.

The application provides a high-carbon cobalt-based wear-resistant Stellite 6B alloy plate precision rolling process, and mainly relates to the field of plate rolling. The rolling process comprises the following steps: Stellite 6B alloy plate blank heating, aluminum silicate fiber cotton sheath, hot rolling, machining, precision rolling, grinding, and inspection. The Stellite 6B alloy plate prepared by the application has excellent wear resistance, can meet the use requirements of high wear resistance, long service life and high strength of the plate, and has a good market application prospect.

The invention provides a novel 16-stage labyrinth type pressure reducing valve, which relates to the technical field of pressure reducing valves, and comprises a labyrinth type valve cage and a valve core, and the valve core is coaxially arranged in the labyrinth type valve cage. A radial 16-stage pressure reduction structure is arranged on the labyrinth type valve cage and used for thoroughly eliminating medium kinetic energy and effectively resisting cavitation. The size of a gap between the valve element and the inner wall of the labyrinth type valve cage is 0.1 mm, so that the adjusting precision and the cavitation resistance are improved. In addition, the adjusting area and the turn-off area on the valve element are arranged separately, and a stellite alloy layer is overlaid on the surface of the sealing face of the valve element. The problems that in the prior art, a valve cage outlet and a valve element are prone to cavitation and scouring are effectively solved, and the service life of the valve under the working conditions of deep adjustment and high differential pressure is remarkably prolonged.