51results about How to "Good metallographic organization" patented technology

The invention discloses a device for preparing semi-solid alloy melt and a process for preparing AlSi9Mg semi-solid alloy. The device comprises a vibrating device which comprises a base and a table top that are connected by a pillar and a rubber spring, the vibrating device is connected with a cooling groove in an inclined way by a supporting frame which can regulate an angle, the table top is provided with a three dimensional vibrating motor, the vibrating acceleration speed is 1 to 2g, the vibrating range is 0.5 to 1mm, the vibrating frequency is 10 to 60 Hz, and a liquid outlet end of the cooling groove corresponds to a forming device. The angle of the cooling groove is 40 to 60 degrees, and the pouring length is 600 to 800mm. The forming device comprises an injection chamber of a die-casting machine, an injection rod, an injection head, a material receiving port and a mold. The rheological forming process for preparing the semi-solid AlSi9Mg alloy melt comprises the steps of alloymelting, gas and slag removing, refining, modifying, inclined vibrating and pouring, rheological die-casting and the like. The device and the process can improve the texture and performance of the semi-solid alloy and solve the problem of solidification and crusting on the surface of an inclined plate in the preparing process.

The invention discloses an automobile gearbox gear carburizing and quenching heat treatment method. The method comprises the following steps: 1, carburizing: placing a gear in a heating furnace, and rising temperature of the heating furnace from room temperature to 900+ / -5DEG C for carburizing for 3-4h, wherein the carbon potential CP in a strong carburizing stage is 1.06+ / -0.3C%, and the carbon potential CP in a diffusion stage is 0.85+ / -0.03C%; 2, quenching: cooling the obtained carburized gear to 830+ / -5DEG C, samming for 25-35min, and quenching in 90+ / -10DEG C quenching oil; and 3, tempering: tempering the obtained quenched gear at 165+ / -5DEG C for 2-3h. The proper reduction of the carburizing temperature and the quenching temperature, the rising of the temperature of the quenching oil and the proper rising of the carburizing carbon potential are carried out on the premise of guaranteeing the quality of a carburized layer, so the carburizing time is not prolonged, and the energy consumption is reduced; and the appearance of black microstructures is prevented, so the surface hardness, the wear resistance and the fatigue strength of the gear are obviously improved, deformation is reduced, the driving balance of the gear is improved, noises are reduced, and the service life of the gear is prolonged.

The invention discloses a thermal treatment method for carburizing and quenching of gearbox gears. The thermal treatment method includes the steps of A, carburizing, B, quenching and C tempering. In the step of A, carburizing, the gears are placed in a heating furnace, the temperature of the heating furnace is increased from the room temperature to the temperature of 850-900 DEG C for carburizing, and carburizing time is 2-5 h; the carburizing process includes a beginning stage, a strong carburizing stage and a diffusion stage; the carbon potential (CP) of the beginning stage is 0.9-1 C%, the CP of the strong carburizing stage is 1-1.1 C%, and the CP of the diffusion stage is 0.8-0.9 C%; the time of the beginning stage is 12-15 min, the time of the strong carburizing stage is 200-220 min, and the time of the diffusion stage is 20-40 min. In the step of B, quenching, the carburized gears are cooled to 810-850 DEG C, then temperature equilibrium is carried out for 20-40 min, and then the gears are quenched in quenching oil with the temperature being 85-95 DEG C. In the step C, tempering, the quenched gears are subjected to tempering at the temperature of 155-170 DEG C for 1-2 h.

The invention discloses a heat processing method for carburizing and quenching. The method comprises the following steps: A) a carburizing step, placing a gear in a heating furnace, and rising temperature of the heating furnace from room temperature to 850-900 DEG C for carburizing for 2-5 h, wherein the carbon potential CP in a strong carburizing stage is 1.02-1.1C%, and the carbon potential CP in a diffusion stage is 0.8-0.9C%; B) a quenching step: cooling the obtained carburized gear to 810-850 DEG C, equalizing the temperature for 20-40min, and quenching in 85-95 DEG C quenching oil; and C) a tempering step: tempering the obtained quenched gear at 155-170 DEG C for 1-2 h. The proper reduction of the carburizing temperature and the quenching temperature, the rising of the temperature of the quenching oil and the proper rising of the carburizing carbon potential are carried out on the premise of guaranteeing the quality of a carburized layer, so the carburizing time is not prolonged, and the energy consumption is reduced; and the appearance of black microstructures is prevented, so the surface hardness, the wear resistance and the fatigue strength of the gear are obviously improved, deformation is reduced, the driving balance of the gear is improved, noises are reduced, and the service life of the gear is prolonged.

This invention relates to gas carburizing the toothed-wheel of heavy duty automobile. It is characterized that this invention utilizes carbon-potential pulsation type gas carburizing, so it overcomes the prior art short comings that carbonization is proceeded under high carbon-potential and diffusion is finished under low carbon-potential. After quenching, the working-pieces have excellent carburized layer concentration gradient distribution, hardness gradient distribution and carburized layer histogram. This inventive method makes parts thus carburized have long service life under complex condition, after the parts are carburized and have gentle hardness gradient.

The invention discloses a continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and a production method thereof, and belongs to the technical field of pipeline steel. The hot-rolled steel plate is composed of, by weight, 0.03-0.06% of C, 0.15-0.30% of Si, 1.20-1.35% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.0012% of S, 0.01-0.05% of Alt, 0.03-0.05% of Nb, 0.00-0.05% of V, 0.005-0.016% of Ti, 0.25-0.40% of Ni, 0.00-0.30% of Cr, 0.00-0.20% of Cu, 0.00-0.15% of Mo and the balance Fe and inevitable impurity elements. Continuous castings with the thickness being 400 mm are adopted for producing the steel plate with the thickness being 41-48 mm. The steel plate and the production method thereof have the advantages that good metallographic structures are obtained, the Charpy impact toughness at -20 DEG C, the drop hammer toughness at -20 DEG C, the low yield ratio, the high uniform elongation rate, the anti-fracture toughness property CTOD, the A solution acid resistance HIC and SSCC, and the like of the large-wall-thickness hot-rolled steel plate for the deep sea pipelines are realized, and therefore the construction requirement of conveying pipelines of oil and gas fields of deep seas can be met.

The invention relates to an H13 die steel heat treating method and H13 die steel obtained through the same. The H13 die steel heat treating method comprises the steps that a steel ingot obtained through electroslag remelting is heated and forged through the two-time upsetting and two-time stretching technology; three-stage heat insulation treatment is carried out on the forged steel ingot, particularly, first-stage heat insulation is carried out at the temperature of 390-410 DEG C with heat insulation time being 90-100 s / 1 mm thick steel, second-stage heat insulation is carried out at the temperature of 640-660 DEG C with heat insulation time being 70-110 s / 1 mm thick steel, and third-stage heat insulation is carried out at the temperature of 890-910 DEG C with heat insulation time being 60-110 s / 1 mm thick steel. In addition, the invention further relates to the H13 die steel obtained through the H13 die steel heat treating method.

The invention relates to the field of aluminium-based alloy with silicon as a secondary main component, specifically to an aluminium-silicon-copper alloy mixed with strontium element and a manufacturing method thereof. The aluminium-silicon-copper alloy mixed with strontium element contains aluminium, silicon, copper, manganese and magnesium, and is characterized by containing strontium as well, wherein the concentration (by mass percent) of strontium is 0.015-0.035%. The manufacturing method of the aluminium alloy mixed with strontium element comprises the following five steps in order: proportioning, fusing, stirring, degassing and casting. The manufacturing method is characterized by comprising the step of adding an aluminium-strontium alloy as well. Addition of the aluminium-strontium alloy is carried out between stirring and degassing. When adding the aluminium-strontium alloy, the temperature of molten aluminum is controlled between 72 DEG C and 750 DEG C. The invention has advantages of casting grain refinement and high mechanical property.

The invention provides a carburization combined tool and heat treatment method of synchronizer combined gears. The carburization combined tool comprises a main bottom plate, flat plates, locating supports, flat supporting gaskets and flat pressing gaskets. The number of the flat plates is at least one, and the main bottom plate and the flat plates are sequentially arranged in parallel from bottom to top and are connected through at least one stand column. The multiple corresponding locating supports are vertically arranged on each flat plate and are transversely or vertically arranged on the flat plate in a staggered manner. The lower portion of each locating support is detachably provided with the corresponding flat supporting gasket, and the lower surface of each flat supporting gasket is in contact with the upper surface of the corresponding flat plate. The upper portion of each locating support is detachably provided with the corresponding flat pressing gasket. At least one combined gear can be placed between each flat pressing gasket and the corresponding flat supporting gasket from bottom to top, and the lower surface of each flat pressing gasket is in contact with the upper surface of the corresponding uppermost combined gear. According to the carburization combined tool and heat treatment method of the synchronizer combined gears, the problem of heat deformation generated after combined gear quenching is solved, and the precision of finished products is improved.

The invention discloses an aluminum tin 40 copper-steel metal bearing material and a production method thereof. The production method comprises that (1) aluminum tin 40 copper alloy ingots of which two surfaces are roughened and a pure aluminum layer are subjected to the dual-surface composite rolling, the cold rolling is conducted sequentially till the target thickness is reached, the aluminum tin 40 copper alloy ingots are obtained through horizontal continuous casting, the processing rate of the dual-surface composite rolling is more than 50% and the processing rate per cold rolling is in a range from 20% to 35%; and (2) steel plates of which two surfaces are roughened and the aluminum tin 40 copper alloy after being burnished in the (1) are subjected to the composite rolling and the annealing is conducted for 8-10 hours at the temperature of 280 DEG C+ / -10 DEG C. The material has good seizure resistance, adaptability and high-temperature properties and is suitable to diesel engine bearing of medium and low speed ships.

The invention discloses TC11 titanium alloy. The TC11 titanium alloy is characterized by being prepared from, by weight, 4.4%-5.7% of Al, 4.4%-5.7% of Mo, 4.4%-5.7% of V, 0.5%-1.5% of Cr, 0.5%-1.5% of Fe, 0%-0.1% of C, 0%-0.3% of Zr, 0%-0.15% of Si, 0%-0.18% of O, 0%-0.05% of N, 0%-0.015% of H and the balance Ti. The raw materials are synthetized into the TC11 alloy according to a conventional method, then heat preservation is conducted on the alloy at the temperature of 700-950 DEG C, and then the alloy is cooled to be at the temperature below 350 DEG C through water cooling or air cooling or cooling in a furnace.

The invention discloses a thermal treatment method for large-section axle-type forge pieces. The thermal treatment method comprises the following steps that a forge piece is normalized with a temperature increasing rate of 4-7 DEG C / min; heat preservation is performed at 910-930 DEG C; the forge piece is air cooled to 500-600 DEG C with a temperature decreasing rate of 60-70 DEG C / min; the forge piece is air cooled to be below 150 DEG C with a temperature decreasing rate of 5-10 DEG C / min; quenching is performed with a temperature increasing rate of 4-7 DEG C / min; heat preservation is performed at 860-880 DEG C; then quenching is performed; the forge piece is rapidly cooled to be below 150 DEG C with a temperature decreasing rate of 100-150 DEG C / min; the forge piece is placed into an oil cooling system for cooling; tempering is performed with a temperature increasing rate of 4-7 DEG C / min; heat preservation is performed at 640-660 DEG C; and the forge piece is air cooled to an operable temperature with a temperature decreasing rate of 5-10 DEG C / min. By adopting the thermal treatment method, the large-section axle-type forge piece can get a good metallographic structure, and have high strength and toughness; and particularly, the core part structure of the large-section axle-type forge piece can be refined, so that the core part and the superficial structure of the large-section axle-type forge piece have the same metallographic structure and mechanical property.

The invention discloses a high-chambering hot-rolled pickled steel plate with yield strength of 550 MPa, and mainly solves the technical problems that the stamping performance and chambering performance of an existing hot-rolled pickled steel plate with yield strength of 550 MPa are not matched, and the manufacturing requirements of complex-shape automobile parts taking bearing performance and formability into consideration cannot be met. The high-chambering hot-rolled pickled steel plate with the yield strength of 550 MPa comprises the following chemical components including, by weight, 0.05% to 0.08% of C, 1.0% to 1.2% of Mn, 0% to 0.10% of Si, 0 to 0.020% of P, 0 to 0.003% of S, 0.02% to 0.05% of Alt, 0% to 0.005% of N, 0.01% to 0.02% of Nb, 0.04% to 0.08% of Ti and the balance Fe and inevitable impurity elements. The steel plate is used for manufacturing automobile structural parts.

The invention relates to the technical field of low-chromium alloy, in particular to low-chromium alloy cast iron and a preparation method thereof. By adopting waste steel as raw materials, adding a carburant in the smelting process, controlling chemical components of molten iron, conducting breeding and spheroidizing treatment before tapping casting and controlling the casting temperature, the obtained product achieves excellent mechanical properties such as the anti-impact toughness, the hardness and the metallographic structure, and the preparation cost of the low-chromium alloy cast iron is reduced.

The invention relates to a hot-rolled wire rod for a cord thread with tensile strength being the 4000MPa grade. The hot-rolled wire rod is prepared from the components in percentage by weight: 0.71 to0.75 percent of C, 0.36 to 0.40 percent of Si, 0.10 to 0.14 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.10 to 0.25 percent of Cr, and 0.0005 to0.0015 percent of B. A production method comprises the steps of smelting through a converter; carrying out RH vacuum treatment; continuously casting into small square ingots; slow cooling the ingot blanks; heating the ingot blanks; rolling at high speed; spinning; and air cooling for standby use. According to the hot-rolled wire rod for cord thread with tensile strength being the 4000MPa grade andthe production method provided by the invention, through reducing the content of carbon, improving the content of silicon, and adopting the matched process, on the premise of ensuring the tensile strength to be larger than 4000MPa, the diameter of a wire material reaches to 3.0 to 3.5mm, so that the fracture surface of the wire material is homogenized in structure and better in performance, gammacrystal particles are micronized, the aging during wire drawing processing is inhibited, and the fracturing of a cementite is inhibited; and the strength and the wire drawing limit of the wire material are improved, the times of stranding filament break does not exceed 2 times / ton steel, and secondary processing by a user can be omitted and simplified, so that the production cost is reduced, andthe production efficiency is improved.

The invention provides a charging basket for thermal treatment of a synchronizer gear hub. The charging basket comprises a charging basket main base plate and a workpiece gasket group arranged on the charging basket main base plate. The workpiece gasket group comprises a workpiece load-bearing inner gasket and a workpiece outer gasket sleeved on the outer side of the workpiece load-bearing inner gasket, wherein a separation distance exists between the workpiece load-bearing inner gasket and the workpiece outer gasket. When the gear hub to be treated is arranged above the workpiece gasket group, the workpiece load-bearing inner gasket is in contact with the gear hub located above the workpiece load-bearing inner gasket, and a gap exists between the workpiece outer gasket and the external spline end face of the gear hub. The charging basket for the thermal treatment of the synchronizer gear hub is used for a thermal treatment process of the synchronizer gear hub, enables the deformation amount of a carburized-quenched workpiece to be effectively reduced under the condition that a whole carburized layer is ensured to be even and a metallographic structure is ensured to be good and accordingly improves the accuracy of finished workpiece products. In addition, the charging basket has good effect after being used for a long period of time.

The invention relates to a single-mold casting machine capable of tilting at 90 degrees to form aluminum piston workblanks through pouring and a use method of the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring. The casting machine comprises a rack, a workbench, tilting oil cylinders, a pouring system, a hydraulic system and an electric system, wherein the workbench is arranged on the rack, the pouring system is arranged on the workbench, aluminum liquid is introduced into the pouring system to form the piston workblanks through pouring, the tilting oil cylinders are arranged at two sides of the bottom of the rack respectively, the other end of each tilting oil cylinder is connected with the workbench, the tilting oil cylinders and the pouring system are all connected with the hydraulic system, and the hydraulic system is connected with the electric system. According to the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring and the use method of the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring, the single-mold casting machine capable of tilting at 90 degrees to form the aluminum piston workblanks through pouring tilts at 90 degrees to form the piston workblanks through pouring, thus the aluminum liquid is subjected to inertia pouring under the action of gravity, a pouring cavity is filled with the aluminum liquid from bottom to top, thus air gap effects of flat pouring are avoided, and meanwhile, feeding positions of the piston workblanks are adjusted to side surfaces, so that effects on the performance of a piston combustion chamber are avoided, and the mechanical performance and the thermal fatigue resistance performance of the piston workblanks are improved.

A precess for preparing the material dedicated for the valve of Cl gas includes such steps as smelting pig iron, used steel and returns in MF furnace, adding Fe alloy, Si and Mn, refining, casting and heat treating to obtain the chloric acid-resistant nodular cast iron.

The invention discloses a ZG25MnSY6 casting material. The ZG25MnSY6 casting material consists of the following components by mass percent: 0.15-0.2% of C, 0.3-0.45% of Si, 0.8-1.1% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, less than or equal to 0.06% of Al, 0.6-0.9% of Cr, 1-1.2% of Ni, 0.3-0.5% of Mo, 0.1-0.15% of V and the balance of Fe, 100% in total. The invention also discloses a method for preparing a casting by using the ZG25MnSY6 material. According to the casting material, a certain alloying element is reduced or increased, smelting is carried out in an electric-arc furnace and refining furnace, an alterant is added in the later refining stage and heat treatment is carried out, so that the metallographic structure of the casting is good, the mechanical property of the casting is greatly improved, the strength and toughness are enhanced, and the service time of the casting is prolonged.

The invention relates to a double-mold automatic casting machine capable of rotating by 90 degrees to pour an aluminum piston blank anda using method of the double-mold automatic casting machine, and belongs to the technical field of piston casting. The device comprises a pouring system, a part taking mechanical hand, a joint pouring robot, a hydraulic system, an electrical operating system and a quenching cooling box, the pouring system is arranged on the ground, the part taking mechanical hand is arranged on the ground on one side of the pouring system, the joint pouring robot is arranged on the opposite side of the pouring system, and the joint pouring robot extracts molten aluminum to pour the molten aluminum into the pouring system. The quenching cooling box is arranged on one side of the part taking mechanical hand, the part taking mechanical hand clamps the piston blank poured by the pouring system to the quenching cooling box, the pouring system is connected to the hydraulic system, and the hydraulic system, the part taking mechanical hand and the joint pouring robot are all connected to the electrical operation system. The overall automatic operation is achieved, the production efficiency is improved, and the mechanical performance and the thermal fatigue resistance of the piston blank are improved.

The invention relates to a double-mold casting machine for transverse core-pulling pouring of an aluminum piston blank and a using method of the double-mold casting machine, and belongs to the technical field of piston manufacturing. The double-mold casting machine comprises a pouring system, a truss part taking mechanical arm, a joint pouring robot, a hydraulic system, an electrical operating system and a quenching cooling box, wherein the truss part taking mechanical arm is arranged above the pouring system, the joint pouring robot is arranged on the truss part taking mechanical arm, and molten aluminum is extracted by the joint pouring robot to be poured into the pouring system; and the quenching cooling box is arranged below one side of the truss part taking mechanical arm, the truss part taking mechanical arm clamps the piston blank poured by the pouring system to the quenching cooling box, the pouring system is connected to the hydraulic system, and the hydraulic system, the truss part taking mechanical arm and the joint pouring robot are all connected to the electrical operating system. Automatic operation of pouring and quenching of the piston blank is achieved, the production efficiency is improved, and meanwhile the mechanical performance and the thermal fatigue resistance of a piston are improved.

The invention relates to valve material of liquid alkali nickeliferous nodular cast iron, and belongs to a manufacturing method of valve material of alloy alkali resistant nodular cast iron applied in the chemical industry. The manufacturing method comprises the following steps: charging cast iron, scrap steel and foundry returns into an IT intermediate frequency furnace to heat, adding ferroalloy, silicon, manganese, nickel and copper after melting, then performing casting and moulding after smelting and finally performing heat treatment. The valve material of the alkali resistant nodular cast iron can be produced steadily through the method. The material has the advantages of excellent alkali resistance, high comprehensive mechanical property and ideal metallurgical phase structure. The alkali resistance of the valve is improved considerably than the like products.

The invention discloses a city building waste alcohol-based casting coating. The city building waste alcohol-based casting coating is characterized by being prepared from the following raw materials in parts by weight: 65-85 parts of quartz tailings, 14-20 parts of high-alumina cement, 1-2 parts of magnesium oxide, 2-3 parts of ferric oxide, 1-3 parts of furnace clinker, 5-8 parts of petroleum coke, 0.3-0.6 parts of an MCA fire retardant, 0.7-1.2 parts of a styrene-acrylic emulsion, 8-14 parts of city building wastes, 2-4 parts of phenolic resin, 2-5 parts of hexamethylenetetramine, 45-60 parts of ethanol and 3-6 parts of an aid. The preparation method has the advantages that the materials are reasonably selected, and the process is simple; the city building wastes are added into the raw materials after being modified, so that various technical indexes of the coating are enhanced, meanwhile, the processing problem of the wasted building wastes is relieved, the environment is protected, and the prepared coating has good sintering character, high temperature resistance and heat preservation character.

The invention relates to application of new nitrided steel in manufacturing of a diesel engine plunger and barrel assembly. The application comprises the following steps of 1, pretreatment before nitriding, 2, workpiece cleaning before nitriding, 3, surface nitriding treatment, 4, workpiece grinding, and 5, workpiece vacuum coating. The diesel engine plunger and barrel assembly made of the new nitrided steel has the advantages of aluminum-containing nitrided steel and aluminum-free nitrided steel, the defects of the aluminum-containing nitrided steel and the aluminum-free nitrided steel are overcome, and after composite heat treatment, the use performance of a low-speed diesel engine plunger pump can be improved, and emission is reduced.

The invention discloses a preparation process of an external thread steel pipe for an anchor rod. The preparation process of the external thread steel pipe for the anchor rod comprises the steps that1, a round pipe blank is manufactured into a round workpiece through the procedures of hot punching and diameter and wall reduction continuous rolling; 2, the workpiece is heated to the temperature required by the process, then is put into a heat preservation electric furnace to be subjected to heat preservation homogenization and enters a machining station of an external thread three-roller hot rolling forming device to be rolled; and 3, the rolled workpiece is quenched, cooled, dewatered and tempered to obtain a finished product, wherein in the 2 and the 3, roller sets are used for driving the workpiece to advance to complete the feeding action, and in the tempering step, the included angle between rollers in the roller sets and the advancing direction of the workpiece ranges from 30 degrees to 60 degrees. By means of the mode, the bending deformation of the workpiece under the action of gravity is effectively avoided while the forming quality of the external thread steel pipe for the anchor rod can be obviously improved, the finishing and straightening procedure in traditional production is omitted, and investment of a production line is reduced.

The invention discloses a process for preparing hot-pressing low-temperature three-way fittings by using X70 steel plates. In the process, firstly, a suitable base material with high manufacturing performance is selected; and meanwhile, on the premise that the welding metal is sufficiently fused in the welding process, the welding current is further reduced, so that the welding speed is improved,the heat input amount is limited, and blank pipes with consistent performance is provided for finished products. According to the process, all the machining procedures for heat input to the products are strictly controlled, and the metal crystal structure reflects the main index of the performance of steel and the main index of the performance of the steel is effectively controlled, the rolling quantity of each time and the water quenching treatment after rolling are strictly controlled, the good metallographic organization of the products is ensured all the time, and the products meeting therequirements of the low-temperature environment standards is finally obtained.

The embodiment of the invention provides a method for processing large single-weight titanium and titanium alloy wire rods. Bar billets are processed by adopting a billet preparation technology of titanium alloy large single-weight wire rods, a multi-die drawing technology, and a continuous annealing technology under inert gas protection to finally obtain the titanium alloy wire rods. Compared with the titanium alloy wire rods manufactured by a traditional hole die drawing process, the titanium alloy wire rods manufactured by the processing method have the advantage of better stress state, andwith compressive stress as the main and tensile stress as the supplement, grains in the titanium alloy wire rods are effectively refined, the hollow phenomenon is completely eliminated, and then thetitanium alloy wire rods with a good metallographic structure are obtained. The test report shows that the mechanical property deviation of the titanium alloy wire rods of the same batch, manufacturedby the processing method, is about 5%, which improves the stability and the consistency of the titanium alloy wire rods.

The invention discloses a hot working technology for a 4Cr14Ni14W2Mo air valve, and belongs to the technical field of working technologies. The hot working technology comprises the following steps of1 air valve rough blank upsetting, 2 solid solution, 3 strain strengthening and 4 aging treatment. According to the technology, air valve rough blank upsetting and strain strengthening are additionally conducted on the basis of traditional solid solution and aging treatment, and the water cooling time, the air cooling time, the initial forging temperature, the forging frequency and the deformationwhich are generated before valve rod portion and garlic head portion forging machining are strictly controlled. According to the technology, the tensile strength and the yield strength of the 4Cr14Ni14W2Mo air valve can be significantly improved, the plasticity indexes (including the percentage elongation after fracture and the percentage reduction of area) are not decreased or slightly increased, the metallographic structure is more ideal, and the 4Cr14Ni14W2Mo air valve produced through the technology has the advantages that the fatigue strength, the safety and the reliability are significantly improved, and the service life is significantly prolonged.

The invention belongs to the technical field of detection machines, and particularly relates to a detection device and a detection method for the sealing performances of expansion tanks. The detection device comprises a plurality of expansion tanks to be detected, a rack, a clamp device and a water inlet device, wherein the rack is made of an aluminium alloy material, and the rack comprises the following composition elements in the following percentages by mass: 1.00-1.50% of Si, 0.50-1.00% of Mg, 0.10-0.20% of Fe, 0.05-0.08% of Cu, 0.02-0.07% of Zn, 0.08-0.12% of Mn, 0.02-0.06% of Ni, 0.05-0.10% of Sb, 0.12-0.15% of Ti, not greater than 0.025% of single impurity elements in other impurity elements, not greater than 0.1% of total impurity elements, and the balance of aluminium. The device is high in detection accuracy level and detection efficiency.