57results about How to "Improve atomic activity" patented technology

The invention discloses a more than 630MPa level high strength steel bar comprising the following components: by weight, 0.28%-0.38% of carbon, 0-0.35% of silicon, 0-0.90% of manganese, 0.80%-1.50% of Cr, 3.00%-4.00% of nickel, 0.40%-0.60% of molybdenum, 0-0.015% of P, 0-0.015% of sulfur, 0-2.0ppm of hydrogen, 0.10%-0.20% of vanadium, 0-0.025% of titanium, 0-0.20% of copper, 0-0.05% of aluminum, 0-0.50% of residual elements and the balance of Fe; the invention also designs an application method of the more than 630MPa level high strength steel bar in reinforced concrete; and the more than 630MPa level high strength steel bar has the advantages of high strength, steel saving, no pollution, good hardenability, low tendency to crack and low relaxation degree.

The invention discloses an ultrasonic auxiliary precision forging method and device, and relates to the field of forging. The ultrasonic auxiliary precision forging method and device comprise an upperconcave die, a lower concave die, an upper punch head, a lower punch head, an upper ultrasonic vibration mechanism and a lower ultrasonic vibration mechanism;and an ultrasonic vibration device penetrates through a punch cushion sleeve and a through groove in the middle of a template and is fixedly connected to the punch heads, an variable amplitude rod transmits the amplified ultrasonic vibrationto the punch heads, and the punch heads transmits the vibration to a blank. According to the ultrasonic auxiliary precision forging method and device, the frequency, the amplitude, the vibration modeof the ultrasonic vibration and the shape and the size of the punch heads are changed to suit for precision forging of different products; the method and device have the advantages that the plastic deformation capability of the metal is greatly improved, the metal filling property is improved, the friction force between the blank and the die is reduced, the grain structure is refined, the roughness of the forming surface is reduced, the demolding capability of the forge piece is improved, the applicability is wide, the material utilization rate and the product percent of pass are improved.

The invention discloses a high strength steel bar for pre-stressed concrete. The steel bar is composed of the following chemical components in percentage by weight: 0.20 to 0.25% of C, 1.50 to 1.85% of Si, 0.20 to 0.50% of Mn, 0.07 to 0.09% of Cr, 0.30 to 0.35% of Mo, 0.25 to 0.35% of V, 0.05 to 0.08% of Nb, 0.42 to 0.61% of Ti, 0.15 to 0.25% of Ni, 0.25 to 0.40% of Ca, not more than 0.025% of S, not more than 0.025% of P, not more than 0.20% of Cu, 0.15 to 0.30% of composite rare earth, and the balance being Fe. The invention further discloses a production technology of the steel bar. The production technology comprises the following steps: smelting to obtain a steel blank, rolling the steel blank, cooling the rolled steel blank, rolling the steel blank for a second time, carrying out a thermal treatment and a stabilizing treatment, performing a gas nitrogenation treatment, spinning, winding, bundling, and storing the bundles in a warehouse.

The invention discloses a processing method of an above-600MPa-grade high-strength steel bar connection sleeve. The sleeve selects No.45 round steel as a raw material, and the No.45 round steel comprises 0.38-0.43wt% of C, 0.8-1.1wt% of Cr, 0.75-1.0wt% of Mn, 0.15-0.25wt% of Mo, 0.15-0.3wt% of Si, below 0.035% of S, below 0.035wt% of P, below 0.035wt% of N, and the balance Fe. The designed processing method of the above-600MPa-grade high-strength steel bar connection sleeve substantially improves the tensile strength and the elongation rate, guarantees the external diameter dimension and fineness of a steel tube, and reduces the friction stress between a tap and the inner wall of the sleeve.

The invention discloses a high-heat-resistance high-strength hard alloy using WC as a hard phase and Co3(Al,W) reinforced Co as a binding phase, wherein the mass percent of the binding phase Co-Co3(Al,W) is 6-30%. The preparation method comprises the following steps: preparing 0.09-1.43 wt% of Co-Al intermetallic compound powder, 0.27-3.39 wt% of eta-phase powder, 66.41-93.76 wt% of WC and the balance of Co powder, and mixing by wet milling; carrying out spray drying; pressing; carrying out liquid-phase sintering at 1350-1500 DEG C; quickly cooling from final sintering temperature to 700-900 DEG C at the rate of at least 10 DEG C/minute; keeping the temperature for 10 hours to perform aging treatment; and slowly cooling to room temperature to obtain the Co3(Al,W) phase reinforced Co binding phase hard alloy. The Co-Al intermetallic compound is added as the Al source, and the eta-phase is used as the W source, thereby avoiding the adverse effect on the oxygen content in the raw materials; the decomposed Al and W in the liquid-phase sintering process have high atom activity, and form a gamma'(Co3(Al,W)) phase with the liquid-phase Co; and the method has the advantages of complete reaction, high distribution uniformity, obviously higher high-temperature rigidity and high-temperature strength, simple technique and controllable composition.

The invention relates to a reinforcement bar and a production technology thereof, in particular to a high-strength hot-rolled reinforcement bar of the 830 MPa level, and a production technology of the reinforcement bar. The reinforcement bar comprises the following chemical components by weight: 0.38 to 0.43% of C, 0.7 to 0.9% of Cr, 0.6 to 0.8% of Mn, 0.15 to 0.25% of Mo, 0.2 to 0.3% of Si, 1.6 to 2% of Ni, 0.035% of S, 0.035% of P, 0.035% of N and the balance of Fe. The shear strength of the reinforcement bar can reach 830 MPa; the reinforcement bar has the advantages of high strength, good ductility, high lagging and fracture resistance, economy of steel material, underrelaxation, easiness in welding, high upset performance and the like, can enable carbide to dissolve fully and diffuse uniformly, and avoids that intercrystalline corrosion and pitting exceeding are caused due to intercrystalline separation of carbide.

The invention discloses a method for manufacturing a semiconductor chip with low warpage. The semiconductor chip is provided with a semiconductor device; a process for manufacturing an inter-metal dielectric layer and a metal interconnecting layer comprises at least once tempering step, so the movability of atoms of the inter-metal dielectric layer and the metal interconnecting layer is improved, the tractility of the two is increased, the stress of the two is correspondingly reduced, and the semiconductor chip has the advantage of low warpage.

The present invention discloses a chromium-molybdenum low-alloy zinc-plating steel strand manufacturing method, wherein the chromium-nickel-molybdenum alloy structure steel comprises, by mass, 0.28-0.38% of carbon, 0-0.35% of silicon, 0-0.90% of manganese, 0.80-1.50% of chromium, 3.00-4.00% of nickel, 0.40-0.60% of molybdenum, 0-0.015%of phosphorus, 0-0.015% of sulfur, 0-2.0 ppm of hydrogen, 0.10-0.20% of vanadium, 0-0.025% of titanium, 0-0.20% of copper, 0-0.05% of aluminum, 0-0.50% of residual elements, and the balance of Fe. According to the chromium-molybdenum low-alloy zinc-plating steel strand manufacturing method designed by the present invention, the prepared chromium-molybdenum low-alloy zinc-plating steel strand has characteristics of high strength, good hardenability good, cracking resistance, low relaxation degree, and smooth and uniform surface zinc plating.

The invention discloses a processing process of a wear-resisting anti-impact type pile foundation steel protective barrel. 0.16-0.22% of Mn, 0.85-1.0% of Cr and 0.16-0.22% of Mo are added, so that the atomic activities of the elements C and N are improved, air mass formed by each atom can form strong interaction with dislocation to generate a yield platform, and relatively great stress is needed to be provided by the outside to start the dislocation, and therefore, the tensile strength is guaranteed to reach 675/Mpa, the percentage elongation after fracture is guaranteed to reach 18.20%, the end-surface shrinking percentage is guaranteed to reach 38%, the yield point elongation is guaranteed to reach 44.4J and the yield point elongation is guaranteed to reach 850/Mpa. The processing process of the wear-resisting anti-impact type pile foundation steel protective barrel disclosed by the invention can be used for improving the hardness and the wear resistance of the pile foundation steel protective barrel, and has the advantages of high strength, no pollution, good hardenability, less possibility in cracking and low degree of relaxation.

The invention relates to a reinforcement bar and a production technology thereof, in particular to a high-strength hot-rolled reinforcement bar of the 730 MPa level, and a production technology of the reinforcement bar. The reinforcement bar comprises the following chemical components by weight: 0.48 to 0.53% of C, 0.8 to 1.1% of Cr, 0.75 to 1.0% of Mn, 0.15 to 0.25% of Mo, 0.15 to 0.3% of Si, 0.035% of S, 0.035% of P, 0.035% of N and the balance of Fe. The shear strength of the reinforcement bar can reach 730 Mpa; the reinforcement bar has the advantages of high strength, good ductility, high lagging and fracture resistance, economy of steel material, underrelaxation, easiness in welding, high upset performance and the like, can enable carbide to dissolve fully and diffuse uniformly, and avoids that intercrystalline corrosion and pitting exceeding are caused due to intercrystalline separation of carbide.

The invention discloses a midair multipoint vertical steel bar connecting joint which is made of number 45 round steel. The round steel comprises the chemical components, by weight, 0.38-0.43% of C, 0.8-1.1% of Cr, 0.75-1.0% of Mn, 0.15-0.25% of Mo, 0.15-0.3% of Si, 0.035% of S, 0.035% of P, 0.035% of N, and the balance Fe. The invention further discloses a construction method of the midair multipoint vertical steel bar connecting joint. The midair multipoint vertical steel bar connecting joint and the construction method thereof are simple and practical, simple in construction and capable of greatly improving the strength, the toughness and the tension stress of the steel bar connecting joint.

The invention discloses a high-reliability air switch cabinet which comprises a cabinet body, a switch chamber, a meter chamber, a mechanism chamber and a cable chamber. The switch chamber, the meterchamber, the mechanism chamber and the cable chamber are arranged in the cabinet body. The cabinet body is prepared from, by mass, 0.18-0.3% of C, 0.6-0.9% of Si, 1.3-1.9% of Mn, 3-6% of Zn, 1-1.5% ofMo, 1-1.2% of Ti, 0.02-0.03% of N, 7-9% of Cr, 0.03-0.06% of Nb, 0.10-0.20% of V, 0.7-0.9% of Mg, 0.001-0.0015% of B, 0.1-0.3% of Cu, 0.1-0.3% of W, 0.025-0.030% of P, 0.010-0.015% of S, 0.1-0.3% ofrare earth elements and the balance Fe and inevitable impurities. The high-reliability air switch cabinet is simple and compact in structure, good in corrosion resistance, high in reliability and longin service life.

The invention discloses a manufacturing method of a high-yield non-bonding prestress steel bar. The steel bar has the advantages of bringing convenience to manual construction, being low in cost, high in strength, good in ductility and high in delayed fracture and saving steel, has ideal insulation effects, and can reduce environment pollution. According to the manufacturing method, steel structure anticorrosive paint is adopted, good mechanical performance and excellent anti-corrosion performance are achieved, stability for weather, oil water mixtures and the like is good, various colors can be mixed according to needs, the steel bar can have good visual effects after the steel anticorrosive paint is used, attractiveness and elegance in decoration are achieved, and cost can also be saved due to the fact that the paint has long anti-corrosion time.

The invention relates to a method for preparing a porous titanium-base composite material through composite ultrasonic vibration high-pressure twisting, in particular to a method for preparing a nano-scale reproducible anti-bacterial medical porous titanium-base composite skeleton material through combination of a high-pressure twisting method and an ultrasonic vibration method. Through proper adjustment on the rotation speed, the downward pressing force, the twisting pressing time and the twisting pressing frequency of a pressing head and the vibration frequency and amplitude of ultrasonic vibration, the blocky nano-scale reproducible anti-bacterial medical porous titanium-base composite skeleton material uniform in grain refinement degree can be prepared.

The invention discloses a high-wear-resistance refrigeration device and a reinforcing process thereof. The high-wear-resistance refrigeration device comprises a box body, a door body, a drying filterand a heater; and the door body is movably connected to the box body, a refrigeration chamber is arranged in the box body, the drying filter is arranged on the box body, and the heater is used for heating the drying filter. According to the high-wear-resistance refrigeration device, the structure is simple and compact, the wear-resistant effect is good, the reinforcing process is simple and easy to conduct, the reinforced refrigeration device has higher wear resistance, and the service life of the refrigeration device is prolonged.

The present invention discloses a AISI4340 prestress steel bar manufacturing method, wherein a AISI4340MOD steel is adopted as a billet material, the billet material is subjected to smelting and finish rolling to obtain a prestress steel bar forging stock with the required size, the prestress steel bar forging stock is sequentially subjected to a hydrogen diffusion heat treatment, rough processing, water cooling quenching and air cooling quenching, a polyethylene corrosion resistance coating is coated on the outer surface of the steel bar forging stock, and a polyethylene heat shrink sleeve is arranged outside the polyethylene corrosion resistance coating. According to the AISI4340 prestress steel bar manufacturing method designed by the present invention, the obtained AISI4340 prestress steel bar has characteristics of high strength, good ductility, strong delayed fracture resistance, steel saving, low relaxation, easy welding, good upsetting property and the like, and further has effects of substantially enhanced corrosion resistance sealing property, and effectively improved mechanical strength.

The present invention discloses 600 MPa-grade-and-above high strength steel bars and a reinforced concrete application method thereof. According to the present invention, 0.4-0.65% by weight of Mn, 0.6-0.7% by weight of Cr, 0.15-0.3% by weight of Mo, 0.5-0.65% by weight of Ni, and 0.25-0.4% by weight of V are added to the steel bar component so as to improve strength, toughness, corrosion resistance, wear resistance and impact resistance of the steel bar, make the steel bar be compact, improve hardenability of the steel, and improve atom activities of the elements such as C and N, such that deformation and cracking can be reduced; and the application method of the diameter 6 mm and diameter 22 mm 600 MPa-grade-and-above high strength steel bars in the reinforced concrete has advantages of steel bar consumption reduction, carrying capacity increase, and crack extension resistance.

The invention discloses a method for preparing a pre-stressed steel strand through instantaneous quenching modification and belongs to the technical field of pre-stressed steel strand preparation. Fe, C, Si and other matter are mixed and smelted into steel, the steel is precisely rolled into a rolled steel wire, the rolled steel wire is washed and dried and then twisted into a steel rope, preheating, secondary heat preservation calcining and secondary lead bath cooling are conducted, the material is cooled in an ice-water mixture, ethyl acetate washing and drying are conducted, and the pre-stressed steel strand is prepared. The method has the advantages that the preparation steps are simple, the atomic activity of carbon of the obtained product is higher than that of other products by 23.2% or above, and dislocation is unlikely to happen; the material performance stability is good, the hydrogen content in the steel rope is lower than 1.23 ppm, and cracks are unlikely to be generated.