20results about How to "Improve hot workability" patented technology

The invention provides a high-damping titanium alloy with a wide temperature range at a high temperature and a preparation method thereof. The titanium alloy is prepared from the following elements in percentage by mass: 3.4 to 5.2 percent of Al, 2.8 to 4.4 percent of Cr, 2.6 to 4.5 percent of Mo, 0.7 to 1.5 percent of Zr, 0.17 to 0.41 percent of O and the balance of Ti. The preparation method of the alloy comprises the following steps: (1) cast ingot smelting; (2) homogenization treatment; (3) beta forging treatment; (4) near beta forging treatment; (5) rolling treatment; and (6) annealing treatment. The method is reasonable in conception, the functional characteristics of wide temperature range and high damping can be obtained at high temperature, the mechanical properties of high strength and high plasticity are achieved, meanwhile, the preparation difficulty of the material is reduced in combination with a traditional titanium alloy machining method, and the method is suitable for large-scale production, popularization and application.

The invention belongs to the technical field of aluminum alloy material preparation, and particularly relates to a preparation method of an optical aluminum alloy material, which comprises the following steps: heating an aluminum alloy cast ingot to 230-270 DEG C, preserving heat, carrying out hot rolling, cooling to room temperature, carrying out cold rolling, and sequentially carrying out intermediate annealing, solution treatment and aging treatment to obtain the optical aluminum alloy material. According to the method, grains are obviously refined, the surface roughness is reduced, and the surface quality of the optical aluminum alloy material is improved.

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.

A high-Ni alloy having excellent weld-hot-cracking resistance includes, in mass%, Cr: 16-30%, Ni: 18-50%, Al: 0.01-1.0%, and Ti: 0.01-1.5%. In a first aspect of the invention, a relationship between number density of TiC precipitates having 1.0 µm or more of equivalent circle diameter and Mg content in steel satisfies formula (1) below. In a second aspect of the invention, S average concentration in oxide- and sulfide- inclusions is 0.70 mass% or more. In a third aspect of the invention, mass ratios of CaO, MgO, and Al2O3 in inclusions, where O or S is detected, satisfy formula (2), the mass ratios being respectively calculated from average concentrations of Ca, Mg and Al in the inclusions, (1) number density of TiC (number of pieces / mm2) ≤ 463 - 9.5 × Mg concentration in steel (mass ppm) and (2) [CaO - 0.6 × MgO] (mass%) / [CaO + MgO + Al2O3] (mass%) ≥ 0.20.

A large-interlayer large-span steel frame explosion-proof glass mousse wall comprises a supporting plate assembly (1) limited between a top cross beam (6) and the ground (4) and a glass panel (501) installed through the supporting plate assembly (1), and is technically characterized in that a top embedded part (310) is welded and fixed to the bottom of the top cross beam (6), and a second adapter (301) is fixed to the outer side of the top cross beam (6); the inner side and the outer side of the glass panel (501) are each provided with a first welding piece (302) fixed to the bottom of the second adapter (301), the first welding pieces (302) are fixedly provided with top channel steel (304) in a returning mode, a foam rod (502) is arranged between the top channel steel (304) and the glass panel (501), and the glass panel (501) and the suspended ceiling (2) are sealed through sealant (506); the upper end and the lower end of the supporting plate assembly (1) are fixed between the bottom embedded part (307) and the top embedded part (310) through a first bolt set (101) and a steel gasket (306) respectively. The sealing structure has the advantages of simple and compact structure, good sealing performance, good hot working performance and the like.

The present application relates to a HRB500E earthquake-resistant steel bar and a preparation method thereof, belonging to the technical field of earthquake-resistant steel bar production. The chemical composition of the steel bar comprises: C: 0.20 wt%-0.25 wt%, Si: 0.50 wt%-0.75 wt%, Mn: 1.20 wt%-1.40 wt%, P: ≤0.030 wt%, S: ≤0.030 wt%, V: 0.05 wt%-0.08 wt%, Fe; the metallographic structure of the steel bar is: ferrite and pearlite. The preparation method of HRB500E earthquake-resistant steel bars provided in the present application eliminates the heating step of the heating furnace, and is optimized from the aspects of composition control, continuous casting billet drawing speed control, direct rolling insulation roller conveying control, start rolling temperature, finishing rolling entrance temperature, wire drawing temperature, air cooling process, roller speed, etc. The produced HRB500E earthquake-resistant steel bars have excellent organizational properties, mechanical properties, and earthquake-resistant properties, with performance parameters Rp0.2≥520Mpa, tensile strength Rm≥700Mpa, elongation≥18%, Agt≥9%, strength-to-yield ratio≥1.25, and yield-to-yield ratio≤1.2.

The invention relates to an iron-chromium-aluminum series electrothermal alloy continuous casting square billet and a preparation method thereof. The preparation method comprises the steps that molten steel is obtained through smelting, the obtained molten steel is loaded into a tundish, and the molten steel in the tundish is injected into a crystallizer for continuous casting to obtain the continuous casting square billet. Wherein the superheat degree range of the molten steel is controlled to be 30 DEG C plus liquidus temperature to 80 DEG C plus liquidus temperature, and the liquid level fluctuation range of the molten steel in the crystallizer is controlled to be-5 mm to + 5 mm; after the molten steel in the tundish is injected into the crystallizer, the method further comprises the steps that electromagnetic stirring is conducted on the molten steel in the crystallizer, the current range in the electromagnetic stirring process is controlled to range from 500 A to 600 A, and the frequency range in the electromagnetic stirring process is controlled to range from 5 Hz to 15 Hz. The preparation method has the advantages of low production cost, low energy consumption, high yield and the like; the continuous casting square billet prepared by the preparation method provided by the embodiment of the invention can be directly used for hot rolling to obtain the wire rod, and the hot working performance of the obtained wire rod is good.

The invention discloses oxidation-crosslinking modified starch with retrogradation resistance, a preparation method and application in PBAT (poly (butyleneadipate-co-terephthalate)). The preparation method of the oxidation-crosslinking modified starch comprises the following steps: S1, dissolving starch in water to prepare starch milk, adding a Dess-Martin oxidizing agent into the starch milk, and washing and drying a product to obtain oxidized starch; s2, dissolving tetraethylenepentamine and glycerol triglycidyl ether in dimethyl sulfoxide, and heating at a constant temperature to synthesize a cross-linking agent; and S3, uniformly mixing the oxidized starch, a cross-linking agent and a plasticizer in a high-speed mixer, and extruding through double screws to obtain the oxidized-cross-linked modified starch. The cross-linking agent with cross-linking and plasticizing functions is synthesized, and the cross-linking agent can improve the cross-linking efficiency and form stable hydrogen-bond interaction, so that starch retrogradation is inhibited. In addition, the oxidized starch and the cross-linking agent are subjected to a Schiff base reaction, so that a dynamic cross-linked network is formed in starch molecules, and the thermal stability of the starch can be improved.

The invention discloses a process for producing boron nickel by a carbon thermal method of a submerged arc furnace, comprising the following steps: S1, preparing the following raw materials by weight: 90-100 parts of nickel oxide, 100-110 parts of boric acid, 5-15 parts of petroleum coke, 75-85 parts of wood chips, and 1-5 parts of high-purity aluminum particles; S2, according to the weight parts described in S1, putting the boric acid, nickel oxide, wood chips and high-purity aluminum particles into a drying furnace, while the temperature is 180-200°C, and the petroleum coke and wood chips are used as combustion raw materials of the drying furnace; S3, drying the dried boric acid, nickel oxide, wood chips and high-purity aluminum particles. The pure aluminum particles are transferred to a rotary kiln for pre-reduction, and petroleum coke and wood chips are added to the high temperature zone of the rotary kiln, and the temperature is controlled between 780-830°C. After processing for 3-5 hours, a pre-reduction charge is obtained; S4, the pre-reduction charge is sent to a submersible thermal electric furnace for smelting at 1800°C for 10-24 hours; S5, and then refined at 1750°C for 30-60 minutes, and bottom oxygen is blown for 20-30 minutes through an oxygen blowing mechanism during refining; S6, after refining, it is naturally cooled for 30-60 minutes, and a casting operation is performed to obtain a boron-nickel alloy.

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 belongs to the technical field of rare earth magnesium alloy materials, and discloses a high-toughness rare earth magnesium alloy deformed material which is prepared from the following raw materials in percentage by mass: 5.1-7% of Sm, 1-3% of Yb, 0.6-1% of Zn, 0.4-0.6% of Zr and the balance of Mg. A preparation method comprises the steps of smelting and casting, homogenizing treatment, variable-speed isothermal extrusion treatment, aging treatment and the like. According to the rare earth magnesium alloy deformation material and the preparation method thereof, the Sm and Yb elements are added into the Mg-Zn-Zr series alloy, the proportion of all the metal elements in the alloy is adjusted, the rare earth magnesium alloy deformation material shows excellent comprehensive mechanical performance, the yield strength ranges from 459 MPa to 469 MPa, the tensile strength ranges from 477 MPa to 484 MPa, and the ductility ranges from 9.3% to 10.0%.

The invention relates to the field of alloys, and provides a low-copper high-iron copper alloy and a production method thereof for solving the problem of poor mechanical performance of a low-copper high-iron alloy, the copper alloy comprises 52-56 wt% of Cu, 2.0-4.0 wt% of Pb, 0.3-0.6 wt% of Ni, 0.8-1.5 wt% of Fe, 0.5-0.8 wt% of Sn, less than or equal to 1.0 wt% of Mn, less than or equal to 0.1 wt% of Al, less than or equal to 0.6 wt% of inevitable impurity elements and the balance of Zn; the sum of the weight percentages of all the elements is 100 wt%. Regenerated brass and brass machining scraps are used as main raw materials for melting and ingot casting production, and the low-copper and high-iron copper alloy which is good in machining plasticity, excellent in turning machining performance, golden yellow in surface gloss and good in mechanical performance is obtained.

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 relates to an alloy steel hot-rolled coil plate for a bearing as well as a preparation method and application of the alloy steel hot-rolled coil plate. The coil plate comprises the following components in percentage by weight: 0.95-1.15% of C; 0.15% to 1.30% of Si; 0.20% to 1.20% of Mn; 0.015% to 0.080% of Al; p < = 0.012%; s < = 0.009%; 1.25% to 5.0% of Cr; 0 to 1.00% of Mo; 0 to 0.50 percent of V; 0 to 0.50 percent of Ni; 0 to 0.060 percent of Nb; cu: less than or equal to 0.080%; ti: less than or equal to 0.005%; h: < = 0.0002%; n < = 0.008%; o: < = 0.0012%; as: less than or equal to 0.010%; less than or equal to 0.002% of Pb; ca is less than or equal to 0.003%, and the balance is Fe and impurity elements. The steel has the advantages of good comprehensive performance and capability of meeting the use requirements of the bearing steel.

The invention discloses high-nitrogen austenitic stainless steel and a preparation method thereof, and the preparation method comprises the following steps: (1) smelting and die casting raw materials to obtain a stainless steel cast ingot; (2) performing heat treatment on the stainless steel cast ingot, wherein the heat treatment is performed according to a preset temperature curve; (3) pre-deforming the stainless steel cast ingot subjected to heat treatment to obtain a pre-deformed blank; (4) carrying out hot working on the pre-deformed blank to obtain a stainless steel plate; and (5) the stainless steel plate is subjected to aftertreatment, and the high-nitrogen austenitic stainless steel is obtained. By implementing the method, hot working cracks can be avoided, and the prepared high-nitrogen austenitic stainless steel has good size uniformity and mechanical property.

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.