8results about How to "Improve hot workability" patented technology

The invention discloses duplex stainless steel containing rare earth elements and a preparation process of the duplex stainless steel. The duplex stainless steel comprises the following components in percentage by weight: less than 0.04% of C, 0.2-0.8% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 22.0-27.0% of Cr, 5.0-7.0% of Ni, 3.0-4.0% of Mo, 0.24-0.32% of N, 0.002-0.005% of B, 0.05-0.10% of mischmetal and the balance of iron and other inevitable impurities. The preparation method comprises the steps of metal smelting; adding alloy for refining; mixed rare earth with the oxygen content smaller than 1000 ppm is added in batches; pouring under the protection of argon; rolling is conducted; and carrying out solution treatment. The method has the characteristics that the purity, the corrosion resistance, the hot working performance and the yield of the duplex stainless steel are improved.

The invention relates to the technical field of alloy preparation, particularly provides a 650 DEG C high temperature resistant titanium-based composite material plate, and further provides a preparation method of the plate. The titanium-based composite material plate resistant to the high temperature of 650 DEG C, provided by the invention, is prepared from the following chemical components in percentage by mass: 6.0 percent to 7.0 percent of Al, 1.0 percent to 3.0 percent of Zr, 0.5 percent to 2.0 percent of Mo, 0.4 percent to 1.0 percent of Nb, 0.4 percent to 1.0 percent of W, 0.1 percent to 0.4 percent of Si, 0.4 percent to 0.7 percent of B, 0.01 percent to 0.10 percent of C and the balance of Ti and inevitable impurities. According to the titanium-based composite material component system provided by the invention, a vanadium element which is easy to generate interface reaction at high temperature is abandoned, and refractory metal elements such as niobium and tungsten are adopted to cooperate with a ceramic reinforced phase formed by boron, carbon and the like, so that the high-temperature performance and the thermal stability of the material are improved; meanwhile, by controlling the content of molybdenum, aluminum and other elements within a specific interval, the hot working performance of the material is remarkably improved while high strength is maintained, and the contradiction between insufficient high-temperature performance and poor hot working performance of a traditional titanium-based composite material is effectively solved.

The invention relates to the technical field of metallurgical materials, and particularly discloses a method for refining a functional boron stainless steel sheet structure through large deformation machining. Comprising the following steps that S1, smelting is conducted, specifically, a steel ingot is prepared through a vacuum induction smelting and electroslag remelting duplex technology; s2, sheath forging: carrying out surface treatment on the steel ingot to obtain a blank, filling the blank into a steel sheath for packaging to form a blank with a sheath, and carrying out hot forging on the blank with the sheath to obtain a forged plate with the sheath; s3, sheath rolling: performing multi-pass hot rolling on the forged plate to prepare a hot-rolled thin plate with a sheath; s4, solution treatment: carrying out solution treatment on the hot-rolled sheet to obtain a solution-treated sheet; and S5, surface treatment is conducted, specifically, after a steel ladle sleeve of the thin plate subjected to solution treatment is removed, surface treatment is conducted, and the functional boron stainless steel thin plate with the needed specification and size is obtained. By means of the method, the boron stainless steel sheet which is excellent in mechanical property, uniform in thermal neutron absorption and suitable for being used as a structure / shielding integrated material can be prepared.

This invention discloses a high-speed embossing and hot-pressing combined unit for cleanroom paper, including a feeding assembly, an embossing mechanism, a hot-pressing component, and a slitting and unloading component. A set of mounting plates on the feeding assembly is bolted to the upper center of a group of mounting platforms, and a second bolt base on the embossing mechanism is bolted to the upper side of the mounting platforms, while a third bolt base on the hot-pressing component is bolted to the upper side of the mounting platforms. This invention utilizes a continuous processing method of high-speed embossing and hot-pressing to process cleanroom paper. The lifting base bar on the second hydraulic cylinder, after output operation, causes the two sets of rollers and conveyor belts to move in opposite directions, allowing the paper to achieve a thermal processing effect through the combined operation of the conveyor belt, inner liner substrate, and heating rods. Large-area hot-pressing processing allows the paper's moisture to evaporate, improves the processing effect, and prevents subsequent deformation of the paper due to temperature changes.

The invention discloses a method for improving yellowing of PHA (polyhydroxyalkanoate), which is characterized in that the PHA such as PHB is compounded with an organic peroxide cross-linking agent, an anti-hydrolysis agent and an antioxidant to achieve the effects of inhibiting yellowing and increasing transparency.

The invention discloses a production technology of an inconel bar. The production technology comprises the following steps that firstly, a 1T vacuum induction furnace is used for smelting, and an electrode bar is cast; step 2, preparation before electroslag remelting; the method comprises the steps of electrode bar surface treatment, dummy ingot block welding and slag material preparation. Step 3, electroslag remelting; fourthly, after the electroslag ingot is completely cooled, the dummy ingot plate needs to be subjected to gas cutting along the bottom diameter; fifthly, cogging is conducted, and upsetting and drawing forging comprises the first heating number and the second heating number; 6, drawing-out forging comprises a third heating number and a fourth heating number, the total deformation of the third heating number is controlled to be 35-45%, and the total deformation of the fourth heating number needs to be larger than or equal to 50%; and seventhly, the bar is subjected to solution annealing. According to the method, the bar meeting the standard requirement is obtained through the low-cost technological process, more uniform equiaxed grains are obtained through the process under the same process, the machining time is shortened while the excellent and beneficial performance is guaranteed, and annealing twin crystals are reduced by adjusting the annealing temperature and time.

This invention discloses a bar rolling production process that considers surface temperature drop compensation, including continuous casting, heat preservation conveying, heating, descaling, continuous rolling under surface temperature control, cooling, shearing, and bundling and collection. By adding induction heating devices between rolling mills, the uniformity of the overall temperature during continuous rolling is controlled, improving the surface hot working performance of bars under high-temperature rolling processes. The distinction between roughing, intermediate, and finishing rolling is eliminated, and a tightly connected continuous rolling mill unit with a short-flow, near-net-shape process layout is adopted, shortening the process flow. Through a combination of rolling deformation and inter-pass induction heating, a uniform temperature field is formed throughout the bar rolling process. After rolling, air cooling ensures a uniform transformation of the microstructure into a ferrite-pearlite microstructure. The produced bar products have excellent surface quality, and the production line features a short production flow, high production efficiency, and low energy consumption, aligning with the green development direction of the iron and steel metallurgical industry.

The application relates to the technical field of material processing, in particular to an aluminum alloy material hot processing device and method, which comprises an extrusion equipment for pressing aluminum materials and a conveying equipment for conveying the heated aluminum materials to the extrusion equipment, further comprises a base, the top of the base is fixedly connected with a fixing seat, a threaded sleeve is rotationally matched in the fixing seat, a threaded rod is threadedly matched with the inner wall of the threaded sleeve, and an arc-shaped plate is fixedly connected with the side wall of the threaded rod; a heating furnace is arranged on one side of the threaded rod close to the arc-shaped plate, a feeding port is formed on one side of the heating furnace close to the arc-shaped plate, and a driving assembly for driving the arc-shaped plate to push the materials into the heating furnace and reciprocally move while driving the heating furnace to rotate is arranged on the base. Through the design of the threaded rod and the threaded sleeve, the aluminum materials can be uniformly moved in the heating furnace while driving the heating furnace to rotate, so that the heating uniformity of the aluminum materials is effectively improved, and the hot processing effect of the aluminum materials is improved.