133results about How to "Reduce segregation" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention discloses active brazing filler metal for sealing sapphire and kovar alloy and a preparation method of the active brazing filler metal. The active brazing filler metal comprises 25.0 wt%-27.5 wt% of Cu, 1.0 wt%-6.0 wt% of Ti, 1.0 wt%-5.0 wt% of Al, 0.1 wt%-1.0 wt% of B, 0.1 wt%-0.5 wt% of rare earth element RE, RE is one or more of La, Ce, Sc, Pr, Nd and Er, and the balance is Ag. The preparation method comprises the following steps: preparing silver-based pre-alloying powder by adopting a gas atomization method, mixing the alloy powder with additive element powder in a ball milling manner, sintering by utilizing vacuum pressure to obtain an alloy ingot blank, and carrying out rough rolling, intermediate annealing and finish rolling to obtain an active brazing filler metal strip with the thickness of 0.05-0.2 mm. The active brazing filler metal is well matched with the thermal expansion coefficient of sapphire, direct brazing of sapphire and Kovar alloy can be achieved, the brazing temperature is moderate, and a brazed joint is uniform in structure and free of defects such as air holes and cracks.

The invention belongs to the technical field of laser processing, and particularly relates to a method for manufacturing a titanium alloy through wire powder coordinated multi-mode laser coupling additive manufacturing, and the method comprises the steps of base material pretreatment, multi-mode coupling laser construction, additive manufacturing, surface strengthening and the like. According to the titanium alloy part manufacturing device and method, material conveying is conducted in the mode that wire feeding and powder feeding are combined, structures with large areas in parts are rapidly manufactured through wire feeding, fine structures are manufactured through powder, and the titanium alloy parts can be efficiently manufactured in a high-precision mode. In the additive manufacturing step, multi-mode coupling annular laser is adopted, annular flat-topped pulse laser can accelerate flowing of a liquid phase before solidification, so that dendritic crystal arms formed through solidification in advance are broken to form new crystal nucleuses, then an equiaxed crystal structure is formed, and the strength and plasticity of the titanium alloy are improved. The annular flat-topped pulse laser can accelerate stirring of the molten pool, the heat mass conveying rate in the molten pool is increased, the element segregation phenomenon is relieved, and finally a uniform and stable titanium alloy structure is obtained.

The invention relates to a heat treatment method for additive manufacturing of a nickel-based superalloy, and relates to the technical field of additive manufacturing. The heat treatment method comprises the following steps that the additive manufacturing nickel-based superalloy is placed at the first temperature, and first-step stress relief annealing treatment is carried out; and then the temperature is increased to a second temperature for second-step stress relief annealing treatment, and after cooling, the additive manufacturing nickel-based high-temperature alloy subjected to stress relief annealing treatment is obtained. The first temperature is 850-890 DEG C, and the second temperature is 900-950 DEG C; carrying out solution treatment on the additive manufacturing nickel-based superalloy subjected to the stress relief annealing treatment to obtain the additive manufacturing nickel-based superalloy subjected to the solution treatment; and aging treatment is conducted on the additive manufacturing nickel-based superalloy obtained after solution treatment, and the additive manufacturing nickel-based superalloy obtained after heat treatment is obtained. The method is mainly used for improving the volume fraction of the gamma'phase of the additive manufacturing nickel-based superalloy, obtaining the gamma 'phase with high cubic degree and proper size, and eliminating cracking and recrystallization caused by residual stress.

The invention discloses high-performance corrosion-resistant maritime work steel and a production method thereof, and the steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.055%-0.060% of Nb, 0.035%-0.045% of Als, 0.90%-1.00% of Cr, 0.90%-1.00% of Ni, 0.20%-0.25% of Co, 0.0130%-0.0114% of N, 0.06%-0.065% of V, 0.035%-0.042% of Ti, 0.45%-0.52% of Cu, 0.03%-0.05% of Sn and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 550-582 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the load of the peak stress of 280 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention discloses high-performance anti-fatigue steel for ocean engineering and a production method of the high-performance anti-fatigue steel. The steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.065%-0.070% of Nb, 0.070%-0.075% of V, 0.035%-0.042% of Ti, 1.25%-1.45% of Cr, 1.25%-1.45% of Ni, 0.30%-0.35% of Co, 0.035%-0.045% of Als, 0.0150%-0.0260% of N, 0.45%-0.50% of Cu, 0.03%-0.05% of Sb and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling, cooling and heat treatment, the Rp0.2 of the steel is 690-750 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the peak stress load of 350 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention discloses low-carbon flow-state solidified soil for a seasonal frozen region. The low-carbon flow-state solidified soil comprises soil, a curing agent and water, the dosage of the curing agent is 15-20% of the mass of the dry soil; the water content is 40-60% of the dry mass of the soil and the curing agent; the soil comprises sludge and building residue soil, and the sludge accounts for 20-40 parts by weight, and the building residue soil accounts for 60-80 parts by weight; the curing agent is prepared from the following components in parts by weight: 40 to 60 parts of phosphogypsum, 10 to 15 parts of mixing plant waste slurry, 20 to 40 parts of steel slag, 5 to 10 parts of quick lime, 0.5 to 1.2 parts of glycerol, 0.2 to 0.6 part of hydroxypropyl methyl cellulose and 1 to 1.5 parts of water reducing agent; according to the invention, various technical problems of insufficient anti-freezing performance, unstable fluidity, long setting time, insufficient early strength, large shrinkage deformation, easy generation of segregation and bleeding and the like of the existing fluid-state solidified soil are solved, and meanwhile, more low-carbon environment-friendly raw materials are introduced, so that multi-aspect improvement of the performance of the fluid-state solidified soil and maximization of environment-friendly benefits are realized; and a more reliable and efficient solution is provided for earthwork such as foundation pit backfilling.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention relates to the technical field of metallurgy, in particular to a production method for reducing casting blank cracks, which comprises the following procedures: (1) pre-desulfurizing molten iron; (2) smelting in a converter; (3) LF refining; (4) RH refining; (5) slab continuous casting; and (6) hot charging and rolling. By optimizing the chemical components and the mass percentage of the continuous casting billet and regulating and controlling the technological parameters of multiple procedures such as converter smelting, LF refining, RH refining, slab continuous casting and hot charging rolling, the austenite grain size in the microstructure of the surface layer of the continuous casting billet is refined, the high-temperature plasticity of the continuous casting billet is improved, and cracks on the surface of the continuous casting billet are reduced.

The invention relates to the technical field of brazing, and particularly discloses a tungsten alloy and molybdenum alloy brazing connection method which comprises the following steps: S1, pretreating a tungsten alloy base material and a molybdenum alloy base material; s2, the brazing filler metal is placed between the tungsten alloy base metal and the molybdenum alloy base metal, the foamed nickel is placed between the brazing filler metal and the molybdenum alloy base metal, and a pre-brazed assembly is obtained after compaction; wherein the composition of the brazing filler metal is Ni < re > Ti Zr Cr < c > Cu < d >; and S3, the pre-brazing assembly is placed in a vacuum brazing furnace to be subjected to brazing treatment. The Cu, Cr and Zr elements are added on the basis of conventional Ni-Ti brazing filler metal, and the plasticity, toughness and mechanical property of a connector can be improved. Meanwhile, the metal foam nickel middle layer is added in the brazing process, residual strain energy can be absorbed, the flow dividing brazing filler metal is refined, the microstructure is changed, a stable structure is formed, and the mechanical property of a connector is remarkably improved.

The invention relates to the technical field of steel and iron materials and preparation thereof, in particular to extra-thick high-strength and high-toughness rack steel for an ocean platform and a manufacturing method of the extra-thick high-strength and high-toughness rack steel. The sum of the mass percent of the V element and the mass percent of the Nb element in the steel plate element composition ranges from 0.09% to 0.12%; the ratio of the mass percent of the V element to the mass percent of the Nb element is controlled to be 2: 1. A heat treatment process of quenching twice after controlled rolling and high-temperature tempering is adopted, a Ni-Cr-Mo alloying component system is utilized, steel of a tempered martensite structure is obtained, the maximum thickness can reach 210 mm, and the finally obtained steel plate has the yield strength larger than 880 MPa, the tensile strength larger than 1000 MPa, the Charpy V-notch impact energy at the temperature of-60 DEG C larger than 170 J and the percentage elongation after fracture larger than 17%. The steel plate is simple in production process, low in cost, good in structure uniformity in the thickness direction and excellent in obdurability matching, and can be used for manufacturing racks for ocean platforms.

The invention discloses an anti-fatigue low-temperature-resistant steel for ocean engineering and a production method thereof. The steel comprises the following chemical components: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.045 to 0.050 percent of Nb, 0.05 to 0.055 percent of V, 0.02 to 0.03 percent of Ti, 0.60 to 0.80 percent of Cr, 0.6 to 0.8 percent of Ni, 0.12 to 0.15 percent of Co, 0.035 to 0.045 percent of Als, 0.013 to 0.014 percent of N, 0.35 to 0.44 percent of Cu and 0.03 to 0.05 percent of Sn. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 500-560 MPa, A is larger than or equal to 24%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the peak stress load of 250 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention relates to the technical field of blast furnace tiled material layers, and particularly discloses a material distribution method for a blast furnace tiled material layer, which comprises the following steps: dividing furnace charge into large, medium and small particles according to particle diameters, filtering through different pore sieves, then distributing to a blast furnace through a material distribution chute according to a particle size sequence, and dividing a blast furnace material distribution layer into a plurality of areas, a laser radar is used for scanning to obtain sub-region height and wrinkle area information, a height difference value ratio mean value and a cloth wrinkle area ratio are calculated to obtain a cloth flatness coefficient, the cloth flatness coefficient is compared with a threshold value to generate a flatness analysis signal, the cloth flatness coefficient is monitored accordingly, a time-cloth flatness coefficient change curve is drawn, and a material layer fluctuation ratio is calculated. And if the fluctuation ratio of the material layer exceeds a threshold value, generating a tiling analysis signal, and finally, calculating the adjustment value of the rotation angle of the material distribution chute based on the signal and related parameters, so as to monitor and adjust the material distribution condition of the blast furnace, effectively improve the material distribution uniformity and stability of the blast furnace and guarantee stable production of the blast furnace.

The invention relates to a hastelloy forge piece and a preparation method thereof, and belongs to the technical field of hastelloy forge pieces. The method comprises the following steps: under a first set condition, carrying out destressing treatment on a red rotating cast ingot with set chemical components; carrying out homogenization treatment on the cast ingot subjected to the destressing treatment; carrying out forging treatment on the homogenized cast ingot for multiple times to obtain a forge piece; and under a second set condition, the forge piece is subjected to heat treatment, so that heat distribution of the forging area of the forge piece is uniform, and the hastelloy forge piece is obtained. According to the embodiment of the invention, under the synergistic effect of destressing treatment, homogenization treatment, forging and heat treatment after forging, the thermal stress and element segregation of the cast ingot are reduced, a precipitated phase is redissolved to the maximum extent, grain recovery and recrystallization are promoted, the machining deformation resistance is reduced, the structure is refined, and the plasticity of the hastelloy forge piece is improved.

The invention discloses an X65MOS-grade seabed acid-resistant pipeline steel plate and a manufacturing method thereof. The X65MOS-grade seabed acid-resistant pipeline steel plate comprises the following chemical components in percentage by weight: 0.01-0.05% of C, 0.05-0.35% of Si, 1.21-1.55% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0015% of S, less than or equal to 0.3% of Cu, less than or equal to 0.3% of Ni, 0.1-0.5% of Cr, 0.02-0.09% of Mo, 0.02-0.049% of Nb, 0.005-0.015% of Ti, 0.001-0.004% of Ca, 0.01-0.05% of Alt, less than or equal to 0.0004% of B, less than or equal to 0.0002% of H, less than or equal to 0.0025% of O and the balance of Fe Alt-Als is less than or equal to 0.008%, and Ca / Alt is more than or equal to 0.1. The thickness of the steel plate reaches 15-40 mm, the yield strength Rt0.50 of the steel plate is larger than or equal to 450 MPa, the tensile strength Rm of the steel plate is larger than or equal to 535 MPa, the yield ratio Rt0.50 / Rm of the steel plate is smaller than or equal to 0.92, the Charpy impact energy at the temperature of-25 DEG C is higher than 250 J, the DWTT test SA% at the temperature of-15 DEG C is larger than or equal to 85%, and the CTOD characteristic value delta m at the temperature of-25 DEG C is larger than or equal to 0.35 mm.

The invention discloses an aluminum alloy for preparing a train built-in bogie frame support and a preparation method of the aluminum alloy, and belongs to the technical field of alloys for high-speed trains. The aluminum alloy contains Zn, Mg, Cu, Zr, Ti, Mn, Y, V, Si and other elements, vanadium can form a solid solution and an intermetallic compound with magnesium and aluminum, so that lattice slippage and dislocation movement are hindered, the overall strength of the aluminum alloy is improved, and the aluminum alloy can bear larger external force while keeping light. According to the method, the aluminum alloy is manufactured through two-step superplastic die forging, defects can be prevented from being formed in the die forging process, stress concentration is reduced, and the mechanical property of the aluminum alloy is effectively guaranteed; and after two-step die forging, the alloy is uniform in plastic deformation and small and uniform in grain size, the mechanical property of the aluminum alloy is favorably improved, the aluminum alloy particularly has better fatigue property, and the aluminum alloy has better safety and reliability while light weight of the aluminum alloy is guaranteed.

The invention belongs to the technical field of bar production, and particularly relates to a production method of a steel bar for a heavy-load automobile half axle, and the steel bar comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.25-0.35% of Si, 1.45-1.70% of Mn, less than or equal to 0.013% of P, less than or equal to 0.006% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, 0.15-0.20% of Mo, 0.06-0.10% of V, less than or equal to 0.15% of Cu and the balance of Fe and inevitable impurities. The method has the advantages that high-performance, high-purity and low-cost production of the steel bar for the heavy-duty automobile half shaft is realized through green short-process production of'ecological electric furnace + LF + RH + continuous casting 'in combination with low-carbon component design and a controlled rolling and controlled cooling process. And macrostructures and non-metallic inclusions of the finished steel meet the requirements of high-end products.

The invention relates to a slag system for electroslag remelting of low-Si low-Al martensitic heat-resistant steel containing B and Zr and a smelting method, and belongs to the technical field of special metallurgy. The slag system comprises the following components in percentage by weight: 45-65% of CaF2; 11 to 20 percent of Al2O3; 15 to 27% of CaO; 2 to 5 percent of MgO; 0.5 to 5.0 percent of B2O3; zrO2: 2%-7%; b2O3 and ZrO2 in a slag system meet the condition that 1g ((% ZrO2) 3 / (% B2O3) 2) is more than 2.0 and less than 2.7. The content of B and Zr in the steel is controlled through the reaction of B and Zr dissolved in the molten steel and B2O3 and ZrO2 in the slag, namely 4 [B] + 3 (ZrO2) = 3 [Zr] + 2 (B2O3), so that the content of B and Zr in the steel is in a target range.

The invention relates to the field of finish paint, in particular to chemical-resistant electroplating finish paint as well as a preparation method and application thereof. The chemical-resistant electroplating finish paint is prepared from the following raw materials in parts by mass: 30 to 50 parts of modified acrylate, 15 to 30 parts of epoxy resin, 5 to 10 parts of modified particles, 3 to 6 parts of photoinitiator, 2 to 3 parts of flatting agent, 0.5 to 1 part of defoaming agent, 3 to 10 parts of pigment and 20 to 40 parts of solvent. The finally prepared electroplating finish paint not only has excellent durability and chemical resistance, but also can be further improved in water resistance, aging resistance and mechanical properties, so that the performance requirements of the existing electroplating finish paint are effectively met, and the electroplating finish paint can be effectively applied to the field of cosmetic packaging and has wide application prospects. And meanwhile, the resistance to chemical substances (such as perfume, emulsion and the like) is also effectively improved, and the product has a very excellent application prospect.

The application relates to a copper-manganese alloy material preparation equipment technical field, in particular to a copper-manganese alloy material smelting furnace, which comprises a base, a main machine and a crucible pouring furnace, the crucible pouring furnace comprises a crucible furnace and a furnace cover, a furnace cavity is arranged in the crucible furnace, a U-shaped heating pipe is arranged at the bottom of the furnace cavity, a ceramic partition plate is arranged in the furnace cavity, the ceramic partition plate is arranged in a cross shape, the furnace cavity is divided into a feeding area, a heating area, a transfer area and a pouring area by using the high-temperature-resistant ceramic partition plate, copper metal powder, manganese metal powder and argon are sealed into the feeding area, so that the raw materials are fully mixed and uniformly distributed in the feeding area; after the raw materials are heated by the U-shaped heating pipe of the high-frequency induction heating to form a metal liquid in the heating area, the metal liquid is poured out after passing through the transfer area and the pouring area; and while the metal liquid is poured out in the pouring area, new raw materials are added in the feeding area for processing, so that the pouring and output of the metal liquid can be continuously carried out in the whole process.

The embodiment of the invention discloses a high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe and a preparation method thereof, relates to the technical field of non-ferrous metal material manufacturing, and aims to solve the technical problem of poor production in the prior art. According to the high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe, the content of Ni ranges from 9.0% to 11.0%, the content of Fe ranges from 1.0% to 2.0%, the content of Mn ranges from 0.5% to 1.0%, the sum of impurity elements does not exceed 0.2%, and the balance is Cu.

This utility model discloses an electroslag remelting furnace for mold steel, relating to the field of metallurgical technology. It includes a base, a coil, and a lifting mechanism. A multi-stage crystallizer is fixedly installed on the base. The multi-stage crystallizer consists of multiple individual crystallizers, each with its own cooling chamber. A mounting base is fixedly installed at the upper end of the multi-stage crystallizer, and a sealing mechanism is fixedly installed at the upper end of the mounting base. The beneficial effect lies in the fact that the weight of the electrodes is detected by a pressure sensor. Based on the change in electrode weight, the magnitude of the magnetic field generated by the coil is adjusted, thereby improving the flow of the molten pool within the multi-stage crystallizer, reducing segregation, and preventing excessive turbulence that could lead to slag entrapment. Furthermore, the independent crystallizers and individual cooling chambers allow for different melting processes of the electroslag in different areas, avoiding uneven cooling or temperature imbalance during the melting process and effectively improving the crystallization quality of the product.

The invention relates to the field of metallurgy, and discloses a large-size maraging stainless steel bar and a preparation method thereof, the diameter of the bar is larger than or equal to 300 mm, and the method comprises a vacuum induction melting stage, a vacuum consumable remelting stage, a fast forging cogging stage and a precision forging forming stage; wherein the vacuum consumable remelting stage comprises an arcing stage, a stable smelting stage and a filling smelting stage; in the arc starting stage, a molten pool is formed by adopting a current of 8-12 kA; in the stable smelting stage, the smelting speed is 4.2-4.8 kg / min, the molten drop is 3-5 s <-1 >, the molten drop short-circuit time is 0.6-0.8 s, and inert gas is started to be filled for cooling after smelting is conducted by the preset weight; and in the filling smelting stage, inert gas filling is stopped, and the current and the melting speed are controlled to descend in a stepped mode. According to the method, the uniformity of components and structures can be improved, so that the mechanical property of the large-size maraging stainless steel bar is improved.

The invention relates to a pure nickel tube plate forging method. The method comprises the following steps: sawing an electroslag ingot electrode plate end and a feeding end; heating is performed; forging: rolling an ingot body; upsetting and drawing for two times, and spinning after upsetting for the third time; cooling after forging; annealing is conducted; wherein the electroslag ingot comprises the following chemical components in percentage by weight: greater than or equal to 99.0% of Ni; cu < = 0.25%; less than or equal to 0.40% of Fe; mn < = 0.35%; less than or equal to 0.15% of C; si < = 0.35%; s is less than or equal to 0.01%. The electroslag ingot is adopted as the raw material, non-metallic inclusions and harmful elements are few, the phenomenon of composition segregation is reduced, the grain uniformity is good, meanwhile, the content of C in the raw material is increased, the strength and hardness of a forge piece can be improved, three-time upsetting and two-time drawing are conducted during forging, the forging deformation is increased, strain is improved, grains are refined, and the strength and toughness are improved; the tensile strength of the forge piece is larger than or equal to 380 Mpa, the yield strength is larger than or equal to 105 Mpa, and the hardness HRB is

The invention relates to the technical field of building admixtures, in particular to an anti-mud foam-stabilizing slump retaining material and a preparation method thereof. The preparation method comprises the following steps: dropwise adding a comonomer mixture solution, an initiator aqueous solution and a molecular weight regulator aqueous solution into a reaction kettle filled with water, stirring and reacting at the reaction temperature of 5-80 DEG C for 1.0-2.0 hours, continuously reacting for 0.5-2.0 hours after dropwise adding to obtain a copolymerization product, and regulating the pH value to 5-7 by using alkali to obtain the anti-mud foam-stabilizing slump retaining material, the prepared slump retaining material is excellent in slump retaining performance, has a very good air entraining effect, is more stable in bubbling when being applied to concrete, can further improve the lubricating effect of particles in multiple systems of the concrete, endows the concrete with an excellent anti-mud function, can reduce concrete segregation and bleeding, has an early strength effect, and has a good anti-mud effect. Even in the harsh process of stirring, long-distance transportation, frequent loading and unloading and even final pouring of concrete, bubbles can still keep the integrity and do not crack or overflow.

The invention provides a preparation method of a high-performance aging-free high-carbon SWRH82B hot-rolled wire rod, and relates to the technical field of hot rolling, and the preparation method comprises the following steps: feeding a high-carbon SWRH82B steel billet into a heating furnace for heating; carrying out rough rolling on the heated high-carbon SWRH82B steel billet by adopting a large square billet large compression ratio rolling technology under heavy pressure; the high-carbon SWRH82B steel billet subjected to rough rolling is fed into a finishing mill to be subjected to finish rolling; the wire rod obtained after finish rolling is fed into an ultra-long air cooling line to be cooled through ultra-large air volume; the cooled wire rod is fed into a coiling device to be coiled; and the coiled wire rod is inspected and packaged, the high-performance aging-free high-carbon SWRH82B hot-rolled wire rod is obtained, a 134m ultra-long air cooling line and a 280000m / h ultra-large air volume fan are adopted for an ultra-long air cooling line, the cooling speed is increased, and therefore the supercooling degree of austenite is increased, nucleation of ferrite is promoted, ferrite grains are refined, pearlite is refined, and the high-performance aging-free high-carbon SWRH82B hot-rolled wire rod is obtained. And the lamellar spacing of pearlite and the thickness of cementite are reduced, so that the structure is easily converted into sorbite, and the product strength and the performance stability of the same circle are improved.

The application relates to the technical field of bolts, and discloses a heat treatment process for high-strength bolts, which comprises the following steps: obtaining high-strength bolts after vacuum air quenching, tempering and cooling of bolt blank materials; the bolt blank materials are composed of the following components in percentage by weight: C 0.1%-0.15%, Mn 0.4%-0.6%, Mo 0.25%-0.35%, W 0.05%-0.15%, Ti 0.2%-0.3%, Co 0.15%-0.25%, Yb 0.05%-0.1%, Mg 0.15%-0.25%, V 0.08%-0.12%, Eu 0.05%-0.15%, Se 0.03%-0.06%, and the balance is Fe and other inevitable impurities. Through the technical scheme, the problem of poor mechanical properties of bolts in the related art is solved.

The invention discloses a processing method of a large-diameter seamless steel pipe for a nuclear power conventional island. The method comprises the following steps: preparing and smelting raw materials; a centrifugal casting step; post-processing the pipe blank; a finish machining and detection step; the centrifugal casting comprises the following steps: a casting mold pretreatment stage; a centrifugal casting stage; in the pipe blank cooling and solidifying stage, the rotary hot extrusion part is introduced into an inner cavity of the pipe blank, the outer wall of the rotary hot extrusion part is further coated with a heat insulation coating, and when the rotary hot extrusion part rotates, at least one working part on the outer wall of the rotary hot extrusion part and the inner wall of the pipe blank periodically move close to or away from each other in the radial direction; therefore, the rotary hot extrusion part can apply periodic radial compaction force to the inner wall of the pipe blank. Acting force can be directly applied to the inner wall of the hollow pipe blank in the cooling and solidification stage of the hollow pipe blank, the quality of the inner wall is fundamentally improved, and the hollow pipe blank of the high-quality large-diameter seamless steel pipe with the smooth inner wall, the compact structure and the uniform performance is produced.

This invention discloses a sulfide-reinforced alloy powder for plasma spraying and its preparation method. The method includes: dispersing alloy matrix powder in a water / alcohol mixed solvent for surface activation to obtain activated alloy powder; adding the activated alloy powder to a sulfur-containing coordination reaction solution containing a sulfur-containing coordination precursor, a transition metal salt, and layered sulfide nanosheets for liquid-phase coordination deposition to form a discontinuous deposition layer with a metal-sulfur coordination structure; then performing low-temperature sulfidation heat treatment under a nitrogen atmosphere to transform the discontinuous deposition layer into a transition metal sulfide interface layer, anchoring the layered sulfide nanosheets therein; finally, drying, dispersing, shaping, and sieving to obtain the target alloy powder. The alloy powder obtained by this invention can improve the sulfide retention rate and lubricating phase distribution uniformity after spraying, and improve the coating bonding strength and friction-reducing and wear-resistant properties.

The invention relates to the technical field of nanocrystalline magnetic sheet preparation, and discloses a nanocrystalline magnetic sheet preparation method and equipment, the equipment comprises: a base, one side of the top of the base is provided with a preparation rack; the control mechanism is located in the preparation frame and comprises a positioning assembly, a material taking assembly and a bearing assembly, raw materials for preparing the nanocrystalline magnetic sheets are added into the feeding box through the feeding hopper, so that the raw materials are located in the feeding box, stirring rollers are driven by a servo motor to rotate, and the raw materials in the smelting box can be smelted; through the arrangement of the control mechanism, finished wafers can be taken out quickly, the production efficiency of the device is improved, the risk that the wafers are damaged due to frequent manual taking and placing of the wafers is avoided, meanwhile, the problem that the wafers are possibly affected by unnecessary heat or other environmental factors due to long-time retention in an existing device is solved, and the production efficiency of the device is improved. And the microstructure and the magnetic performance of the material are further damaged.