37results about How to "Well-organized ingredients" patented technology

The invention discloses a method for preparing high-plasticity welding wire by use of brittle Sn-Bi alloy. The method is characterized in that the method comprises processing a Sn-Bi alloy ingot into an equal channel angular extrusion billet, preheating and keeping the temperature; subjecting the equal channel angular extrusion billet to isothermal extrusion in an equal channel angular extrusion mold to prepare an extrusion blank; extruding to obtain a drawing blank meeting the requirement for drawing formation; conducting isothermal drawing by use of a water-cooled temperature-control wire drawing machine to obtain the Sn-Bi welding wire; and coiling and packaging. The method can prepare all specifications of high-strength and high-plasticity continuous welding wires having a diameter less than 1.5mm from the high-brittleness Sn-Bi alloy that is difficult to deform and process. The prepared wire has fine grains, uniform components and, excellent welding performance, and can meet the various requirements for packaging and welding packaging. The method has the advantages of simple process and high operability, and is an ideal method for preparing Sn-Bi alloy welding wire.

The invention provides a preparation method of a GH625 high-temperature alloy tube blank. The preparation method comprises the steps of manufacturing an electrode bar through adopting a vacuum induction melting method; after the electrode bar is subjected to surface polishing, putting the electrode bar into an electroslag remelting furnace to be subjected to electroslag remelting, so as to obtain an electroslag steel ingot; after cogging of the electroslag steel ingot, cutting and grinding defective parts, and putting the electroslag steel ingot into a forging heating furnace to be subjected to heat preservation forging; after ultrasonic nondestructive inspection of the electroslag steel ingot subjected to heat preservation forging, processing the electroslag steel ingot to obtain a bar material; processing a centering hole in the center of the excircle at one end of the bar material; putting the bar material with the processed centering hole into a heating furnace to be heated; carrying out three-roll piercing on the heated bar material through utilizing a three-roll cross-rolling piercer; and carrying out water cooling on the bar material subjected to three-roll piercing to the room temperature to form the GH625 high-temperature alloy tube blank. Through utilization of the preparation method, the finished product rate of the tube blank can be increased.

The invention provides a preparation method of a GH4169 high-temperature alloy tube blank. The preparation method comprises the steps of manufacturing an electrode bar through adopting a vacuum induction melting method; after the electrode bar is subjected to surface polishing, putting the electrode bar into an electroslag remelting furnace to be subjected to electroslag remelting, so as to obtain an electroslag steel ingot; after cogging of the electroslag steel ingot, cutting and grinding defective parts, and putting the electroslag steel ingot into a forging heating furnace to be subjected to heat preservation forging; after ultrasonic nondestructive inspection of the electroslag steel ingot subjected to heat preservation forging, processing the electroslag steel ingot to obtain a bar material; processing through holes in the centers of the excircles at the two ends of the bar material; putting the bar material with the processed through holes into a heating furnace to be heated; carrying out three-roll piercing on the heated bar material through utilizing a three-roll cross-rolling piercer; and carrying out water cooling on the bar material subjected to three-roll piercing to the room temperature to form the GH4169 high-temperature alloy tube blank. Through utilization of the preparation method, the finished product rate of the tube blank can be increased.

The invention discloses an electroslag remelting method for Hastelloy, wherein an adopted consumable electrode is subjected to high-temperature diffusion annealing at 1100-1150 DEG C, after which theelectroslag remelting is performed under the protection of argon; and the smelting rate during the electroslag remelting is 3 kg/min-3.5 kg/min. According to the electroslag remelting method, the adopted consumable electrode is subjected to high-temperature diffusion annealing firstly, the electroslag remelting is performed after homogenization is finished, low smelting speed control is adopted, and thus a uniform solidification structure of a cast ingot can be effectively guaranteed, and a Hastelloy steel ingot with uniform and excellent component structure is obtained. According to the electroslag remelting method, the matching of an electroslag slag system is guaranteed, the liquidus temperature of Hastelloy is relatively low, a shallow and flat molten pool can be obtained by adopting higher voltage and lower current in the smelting period, and therefore good surface quality can be guaranteed at a low smelting speed; and by properly increasing the filling ratio, the electroslag process is improved, the direct current component of the crystallizer in the electroslag process is increased, the lower slag temperature and the smaller molten pool volume are kept, the width of a two-phase region is reduced, the local solidification time is shortened, and a better solidification structure is obtained.

The invention discloses a preparation method of a sleeper elastic strip, and relates to the technical field of metal function material preparation. The sleeper elastic strip is prepared from the components in percentage by mass: 0.56 to 0.60 percent of carbon C, 1.8 to 2.0 percent of silicon Si, 0.80 to 1.2 percent of manganese Mn, 0.15 to 0.2 percent of vanadium V, less than 0.10 percent of copper Cu, less than 0.1 percent of aluminum Al, less than 0.015 percent of sulfur S, less than 0.015 percent of phosphorus P, and the balance ferrum Fe, wherein according to the impurity elements, the oxygen content O is less than 12ppm, and the nitrogen content N is less than 15ppm. The preparation method of the sleeper elastic strip comprises the steps of adopting an induction vacuum electric furnace for carrying out gas shield electro-slag melting, hot forging, and hot rolling to obtain a spring steel billet material; adopting the spring steel billet material as a raw material, carrying out medium frequency induction heating, molding the sleeper elastic strip, placing in a gas co-permeation furnace, carrying out gas nitrogen N, carbon C and oxygen O co-permeation treatment at the temperature of 480 to 520 DEG C, and obtaining a compound layer with the thickness being 3 to 5 micrometers and a co-permeation layer with the thickness being 0.1 to 0.2mm on the surface; carrying out zinc-aluminum coating treatment on the sleeper elastic strip subjected to gas co-permeation, drying for 0.5 to 1 hour at the temperature of 300 to 350 DEG C after coating, and controlling the thickness of thecoating to range from 3 micrometers to 5 micrometers.

The invention relates to a method for smelting ultra-low carbon stainless steel in a vacuum induction furnace. The method comprises the steps of filling raw materials required by smelting into a crucible; starting to heat after vacuumizing until the raw materials are melted down; reducing the vacuum degree, and adding iron ore into the molten steel till [C] is less than or equal to 0.01 wt%; stopping vacuum, adding aluminum until [O] is less than or equal to 0.002 wt%, starting a vacuum pump, and pre-degassing until [N] is less than or equal to 0.002 wt%; adding metal chromium, heating after melting down, and carrying out vacuum final degassing until [N] is less than or equal to 0.003 wt%; cutting off power to form a film, introducing argon, alloying Nb and Ti elements, adding an alloy, switching to a stirring power supply, and electrifying to melt down; and raising the temperature to 30-60 DEG C above the molten steel liquidus temperature, and carrying out electrified tapping. According to the method, the harmful element C is effectively reduced through iron ore decarburization, excessive acid-soluble aluminum can be volatilized through high-vacuum degassing, N, O and H can be reduced, the cleanliness of the steel is improved, and it can be guaranteed that the component structure of a steel ingot is more uniform through low-liquidus casting.

The invention discloses a high-frequency induction heating solidification device and method for preparing high-temperature alloy, and relates to a thermal solidification device and method. The invention aims to solve the problems of coarse structure and serious element segregation of the existing NbSi-based alloy after a large number of alloying elements are added. A material spoon transmission mechanism is installed on the upper end face of a furnace body, a material turning spoon is installed on the material spoon transmission mechanism in a sealed mode to rotate and lift the material turning spoon, and a water-cooling copper crucible is cooled in an upper water-cooling mode and located in the furnace body; the lower portion of the high-frequency vibration rod is installed in the rack assembly, the high-frequency vibration rod upwards penetrates through the furnace body and then stretches into the water-cooling copper crucible, the induction coil is arranged on the water-cooling copper crucible in a sleeving mode, the alloy solidification process is effectively regulated and controlled through ultrasonic treatment, the alloy structure is improved, and the purpose of greatly improving the alloy performance is achieved. The induction coil is used for heating, so that the problems of overhigh heating speed and difficulty in temperature gradient control caused by heating by an electric arc melting method are avoided. The method is used for preparing the high-temperature alloy.

The invention relates to a preparation method of diffusion bonding titanium powders, in particular to a method for producing powders for high performance powder metallurgy titanium alloys. The preparation method comprises the following steps that coarse particle titanium powders and elemental powders or alloy powders are used as raw materials to be mixed according to the proportion of required components, obtained mixed powders are subjected to diffusion bonding treatment, and hydrogen is introduced to form titanium hydride; and then the titanium hydride is taken out of a furnace, ball millingand crushing are carried out to obtain powders with the required particle size, and finally dehydrogenating is carried out to obtain the diffusion bonding titanium alloy powders. According to the preparation method, the cost of titanium alloy powders is obviously reduced, and the cost is only 1/10-1/2 that of the prior art; the preparation method has the advantages of low equipment requirement, less fixed asset investment, high production efficiency and simple and controllable production process; obtained products have low oxygen content and few impurities; and products obtained after sintering have stable performance, low oxygen content and uniform component structures.

The invention discloses a forging method of titanium alloy ingot castings with a large height-diameter ratio. According to the method, an advanced high-speed forging unit and a blank opening mold forthe ingot castings with the large height-diameter ratio are adopted, an appropriate deformation speed rate and an appropriate deformation amount are selected, and direct blank opening forging of the ingot castings with the height-diameter ratio higher than or equal to 3 can be completed. By means of the method, not only can metallurgical defects of titanium alloys containing Fe, Cu, Mo and other elements which are likely to be segregated be avoided during smelting of the ingot castings with a large diameter, but also the problems about bidirectional expansion, bending, folding and the like during blank opening of the ingot castings with the large height-diameter ratio can be solved. Therefore, batched production of large-tonnage titanium alloy rod materials with great performance is achieved.