899results about How to "Refine the grain size" patented technology

The invention discloses a superhigh intensity wear-resistant steel and the manufacturing method, which belongs to the manufacturing field of low alloying steels, according to percentage by weight, the chemical components of the steel are that C 0.10-0.17%, Si 0.25-0.50%, Mn 1.20-1.50%, P<=0.018%, S<=0.008%, Cr 0.20-0.05%, Ni0.25-0.50%, Mo 0.10-0.40%, Als 0.02-0.06%, B<=0.005%, RE<=150g/t, and the allowance is Fe and unavoidable impurities, and the content of carbon is Ceq(%)<=0.60, Ceq(5)=C+Mn/6+(Mo+Cr+V)/5+(Ni+Cu)/15. The specific method for producing the steel comprises the following steps: smelting ultra-pure steel, desulfurizing molten iron, compounding and converting the top and the bottom of a converter, doing vacuum treatment, feeding rare earth (RE) silk through a crystallizer, casting into bar plates, heating the bar plates, roughing, planishing, air cooling or feeding middle pressure, water cooling, quenching and tempering steel plates. V does not contain in the chemical components of the steel, inner stress of steel is low, steel welding property is improved, and steel has excellent abrasion resistance and ultra-high strength and toughness properties, which is beneficial for popularization and application.

The invention discloses a fibre-polymer compound toughened concrete and a preparation method for the same. The basic raw materials of the concrete are coarse aggregate, fine aggregate, portland cement, fly ash and a polycarboxylic water reducer; moreover, fibres and a polymer are added, the fibres are any one of end-hook type steel fibres, superfine type steel fibres, modified polyester fibres, polyvinyl alcohol fibres, basalt fibres and cellulose fibres, and are doped in a ratio that the volume doped amount in per 1 m<3> concrete is 0.08%; and the polymer is any one of ethylene-vinyl acetate copolymer, ethyl acrylate, styrene-acrylate copolymer, vinyl acetate-acrylate copolymer and organosilicone acrylate, and the doped amount of each polymer is 10% based on the mass of the portland cement and the fly ash. The preparation method comprises the following steps of: pouring stone, sand, a gelling material, fibres, and water dissolved with a water reducer, and then stirring according to a blending mode of pouring dry materials at first and then pouring wet materials; and pouring the polymer, and stirring and forming.

The invention belongs to the technical field of automobile steel, and in particular relates to a double-phase twinborn induced plastic super-strength automobile steel plate and a preparation method thereof. The steel plate comprises the following chemical elements in percentage by weight: 0.3-0.6% of C, 8-12.00% of Mn, 1.00-3.00% of Al, less than or equal to 0.020% of P, less than or equal to 0.02% of S and the balance of Fe and inevitable impurities. The steel plate can be selectively cold-rolled with 5-25% of rolling reduction after warm-rolling at 100-250 DEG C, or a hot continuous rolled plate coil is cold-rolled after being softened and annealed. The yield strength of the steel plate is greater than or equal to 650MPa, the tensile strength is 1000-1500MPa, the extension rate of short continuous annealing is 15-25%, the product of strength and elongation is 20-35GPa%, the extension rate obtained after cover-type prolonged annealing is 25-40%, and the product of strength and elongation is 30-40GPa%.

The invention discloses a hot-rolled 400MPa grade high-strength steel bar for reinforced concrete and a production method for the steel bar, and belongs to the technical field of micro-alloying of ferrous metallurgy. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.20 to 0.80 percent of Si, 1.20 to 1.50 percent of Mn, 0.02 to 0.06 percent of Ti, less than or equal to 0.01 percent of N, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, and the balance of Fe and inevitable impurities. The preparation method for the steel bar comprises the following steps of: a, smelting crude molten steel, tapping, deoxidizing and alloying; b, refining, finely regulating the components, and pouring; and c, hot rolling, wherein titanium is alloyed in the tapping process and after deoxidizing or in the refining process. By using the principle that the titanium plays a role in precipitation and reinforcement in the steel, the mechanical properties of the steel such as yield strength and tensile strength are improved, and the property requirement of the 400MPa grade high-strength steel bar is met..

The invention provides low-temperature polycrystalline silicon thin film and a production method thereof. The production method is used for producing low-temperature polycrystalline silicon thin film low in surface roughness, large in crystalline grain size and uniform in crystalline grain distribution and includes forming a buffer layer on a substrate, forming a seed crystal layer with crystal nucleus uniformly distributed on the buffer layer by means of the pattern forming technology; forming a non-crystalline-silicon layer on the seed crystal layer; and subjecting the non-crystalline-silicon layer to excimer laser annealing. The crystalline grains of the low-temperature polycrystalline silicon thin film produced by the production method are large in size and uniform in distribution, and further, the low-temperature polycrystalline silicon thin film is quite low in surface roughness, and accordingly solves the problems of low migration rate, high leakage current of thin-film transistors and unevenness of the migration rate and threshold voltage when being applied to a back plate of a low-temperature polycrystalline silicon display screen.

The invention provides a method for producing a high-strength and elongation product automobile steel plate by a continuous annealing technology, belonging to the technical field of an automobile steel plate. The method comprises the following steps: based on the reasonable chemical component design and the alloy element partition, firstly, obtaining transition carbide with fine dispersion distribution by a cold rolled plate coil importantly, and promoting austenite inverse phase transformation through the solid solution of the fine carbide through two-phase region annealing, to obtain more and stable austenite phases to be remained. According to the method, the strict technological conditions for forming the finely-dispersed carbide and the strict interval for carrying out the technological parameters of the two-phase region annealing are given, so that the method has the advantages that the continuous annealing plate coil which is even in performance and good in surface quality can be obtained due to the short-time annealing of the existing continuous annealing production line of a steel factory, wherein the strength of the steel plate is 0.6-1.2GPa, the percentage elongation of the steel plate is 45-20%, and the product of strength and elongation is 25-40GPa%.

The invention discloses high-strength wrought magnesium alloy and a preparation method thereof and belongs to the technical field of light metal materials. The high-strength wrought magnesium alloy comprises the following components in percentage by weight: 2.0-6.5% of Zn, 0.1-3.0% of RE, 0.1-2.0% of Ca and the balance of Mg and inevitable impurities; the high-strength wrought magnesium alloy also can comprise grain refiners Mn and/or Zr. Zn is a main strengthening element in the alloy, and can improve the room temperature strength of magnesium alloy through solid solution strengthening and aging precipitation strengthening; Ca is used for promoting precipitation, refining grains and improving high-temperature strength of alloy; and a small amount of RE is used for restraining recrystallization, refining deformed alloy grains, regulating texture and improving plasticity of alloy. According to the invention, by replacing expensive rare earth elements with cheap common alloying elements, a strengthening effect similar to that of rare earth is generated, the rare earth content is completely replaced or lowered and the cost of alloy is reduced while strength is guaranteed.

The invention discloses an Er-containing high- niobium Ti-Al intermetallic compound material and a preparation method thereof, and belongs to intermetallic compound materials. The material is composed of the following elements in mole percent: 41-46 percent of Al, 5-15 percent of niobium, no more than 0.4 percent of Er, and the balance of Ti and unavoidable impurities. The preparation method comprises the following steps: adding titanium sponge, high-purity aluminium, Al- niobium intermediate alloy and Al-Er intermediate alloy into a water cooled copper crucible vacuum induction smelting furnace as per the composition, vacuumizing to 2.0-3.0*10<-3>mbar, rising the smelting power to 160-180 kW at the speed of 5-10 kW/min and stopping at 160-180 kW, smelting for 1-3 minutes at a constant power, obtaining melt, mixing the melt uniformly; and casting the melt into a metal mold preheated to 300-350 DEG C, forming an Er-containing high-niobium Ti-Al intermetallic compound material ingot, and cooling together with the smelting furnace. The method enables the crystal size and layer space of the Ti-Al intermetallic chemical combination to be smaller and thinner.

The invention discloses ultrahigh-strength hot-rolled Q and P steel and a production method thereof. The production method includes the procedures of smelting, casting and hot rolling. The steel comprises 0.14%-0.45% of C, 0.15%-2.0% of Si, 1.0%-5.0% of Mn, 0.010% or less of S, 0.015% or less of P, 40 ppm or less of H, 0.02%-1.5% of Al, 0.01%-0.08% of Nb, and the balance Fe and inevitable impurities. The hot rolling procedure includes the steps of heating, rough rolling, finish rolling, laminar cooling and reeling. In the heating step, the heating temperature ranges from 1100 DEG C to1200 DEG C, and heat preservation is conducted for 1-3 hours. In the rough rolling step, the rolling starting temperature ranges from 1000 DEG C to 1100 DEG C, and the overall reduction is larger than 40%. In the finish rolling step, the rolling starting temperature ranges from 900 DEG C to 950 DEG C, the rolling finishing temperature ranges from 780 DEG C to 880 DEG C, and the overall reduction is larger than or equal to 60%. In the laminar cooling step, front-end cooling is conducted, the cooling rate is larger than or equal to 45 DEG C/s, and the finish cooling temperature ranges from 150 DEG C to 350 DEG C. In the reeling step, the reeling temperature ranges from 150 DEG C to 350 DEG C. Before the steel coil temperature is 100 DEG C, the cooling rate of 5-20 DEG C/hour is kept. Through the method, the martensite plus retained austenite microstructure with a small grain size can be obtained.

The invention relates to a ball grinder available for the solid state reaction of powder, which mainly comprises a ball grinding cylinder, an electromotor, a driving device, a grinding ball and a material inlet and outlet, wherein the horizontal type ball grinding cylinder is fixedly supported on a bracket; a jar is internally provided with the girding ball; the center of the ball grinding cylinder is provided with a rotatable main shaft; the main shaft is driven by the electromotor through the driving device to rotate; the main shaft is provided with a blade, wherein the rotating speed of the blade is 300-2000 r/min; the mechanical energy is transmitted to the grinding ball through the beating of the blade, so that the grinding ball can irregularly move with high speed; the bottom of theball grinding cylinder is in the shape of gradient with 0-30 degrees from the two ends to the center; the jar body of the ball grinding cylinder is provided with a cooling sleeve and an inlet and an outlet of cooling medium; and the jar body of the ball grinding cylinder is provided with an air exhausting opening and an air inlet. The ball grinder can lead the grinding ball to generate higher mechanical energy to provide high energy for inducing the solid state reaction among materials, thereby smashing, grinding and dispersing the materials and directly reacting to generate nanometer composite oxide.

A copious cooling asymmetrical rolling method for preparing an entropy alloy foil in high-performance CrCoNi comprises the following steps: cutting a CrCoNi alloy bar or plate into sheets; carrying out copious cooling treatment in a copious cooling box at the temperature of minus 190 DEG C to minus 150 DEG C; cooling rolls by using a liquid nitrogen spray gun; carrying out copious cooling asymmetrical rolling on samples after copious cooling; maintaining liquid nitrogen in an asymmetrical rolling process to cool the rolls; cooling the rolled materials in the copious cooling box; and repeatingthe fourth step and the fifth step until the reduction rate of rolled pieces exceeds 85%-95% and the thickness of the foil is 200 mu m-6 mu m. CrCoNi alloy has good plastic deformation capacity underthe condition of ultra-low temperature, dynamic recrystallization behavior of the grain size of a material in a large plastic deformation process is inhibited by ultra-low temperature to reduce the grain size, the thickness of the material is reduced by twisting rolling deformation in a rolled piece deformation region in the asymmetrical rolling process, thus, entropy CrCoNi alloy foil is produced, the strength and plasticity of the material are improved effectively, and thus, the prepared medium-entropy CrCoNi foil has high toughness.

The invention provides a production method of a tantalum target and a tantalum target component. The production method of a tantalum target comprises the following steps of providing a tantalum ingot; performing hot forging on the tantalum ingot to form a first tantalum target blank; performing first heat treatment on the first tantalum target blank to form a second tantalum target blank, wherein the temperature of the first heat treatment is 1,000-1,200 DEG C, and the temperature is maintained for 30-90 minutes; after the first heat treatment, performing hot rolling on the second tantalum target material to form a third tantalum target blank; performing second heat treatment on the third tantalum target blank to form the tantalum target, wherein the temperature of the second heat treatment is 1,000-1,200 DEG C, and the temperature is maintained for 30-90 minutes. By adopting the technical scheme, the produced tantalum target has relatively uniform internal organization and good magnetic property; moreover, by adopting the tantalum target to produce a tantalum target component for a semiconductor, the formed film has relatively good quality.

A TiAl intermetallic compound materials containing rare-earth Y and its preparing method are disclosed. It consists of Ti 40-40at.%, Al 38-50at.%, Y 0.02-1at.%, alloy element 0-15at.%. It is prepared by a. adding metal mould containing rare-earth element, Ti and Al into water-cooled copper crucible vacuum inducing smelting furnace; b. preheating metal mould before smelting and vacuum pumping; c. keeping temperature after alloy melting, and mixing melt; d. pouring melt into metal mould and forming TiAl intermetallic compound casting ingot containing rare-earth Y. It achieves simple process and improvement of materials performance.

The present invention relates to metal rolling technology, and especially the rolling process of twisted low carbon steel bar. The twisted low carbon steel bar has the chemical components of: C 0.17-0.23 wt%, Si 0.20-0.80 wt%, Mn 0.50-1.50 wt%, S not more than 0.035 wt% and P not more than 0.035 wt%. The rolling process with complete or patial temperature control includes the following steps: initial rolling with low temperature cogging at 850-950 deg.c, middle rolling at 750-850 deg.c with accumulated deformation over 50 %, finish rolling at 750-900 deg.c, and subsequent water cooling at lower than 600 deg.c with cooling speed greater than 10 deg.c/sec. Compared with available technology, the present invention has superfine crystal grain structure and high steel bar performance.

The invention relates to the field of third-generation advanced high-strength steel used for automobiles and discloses 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and a manufacturing method thereof. A steel plate comprises the chemical components including, by mass percent, 0.18-0.22% of C, 1.0-3.0% of Mn, 1.0-2.0% of Si, not greater than 0.05% of P, not greaterthan 0.02% of S, 0-0.05% of Nb, 0-0.2% of Ti and the balance iron and inevitable impurities. The steel plate manufacturing method relates to the process of steel smelting, hot rolling, cold rolling,pre-quenching and heat treatment, and finally, a ferrite-bainite-martensite-retained austenite mixed structure is obtained. According to the 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and the manufacturing method thereof, on the basis of traditional C-Mn-Si series quenched partition steel, Nb and Ti elements are added for refining the structure, pre-quenching treatment and a one-step partition process are adopted, finally the ultrahigh-strength quenched partition steel with the yield strength being 500-800 MPa, the tensile strength not smaller than 1180 MPa, the elongation after fracture not smaller than 20% and the product of strength and elongation not smaller than 24GPa.% is obtained, and the mechanical property is quite excellent.

The invention discloses a 500-MPa high-strength steel bar for reinforced concrete and a production method thereof, belonging to the technical field of microalloying in ferrous metallurgy. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.18-0.25% of C, 0.20-0.80% of Si, 1.20-1.50% of Mn, 0.06-0.12% of Ti, at most 0.01% of N, at most 0.045% of S, at most 0.045% of P, and the balance of Fe and inevitable impurities. The preparation method of the steel bar comprises the following steps: a. crude smelting, tapping, deoxidizing and alloying; b. refining and composition fine adjustment, and casting after satisfying the steel bar composition requirement; and c. hot rolling; wherein the titanium is alloyed in the tapping process after deoxidizing or in the refining process. By using the principle that the titanium in steel reinforces the precipitation, the invention enhances the mechanical properties of the steel, and satisfies the performance requirements for 500-MPa high-strength steel bars and even anti-seismic steel bars.

This invention is a process for making micro-multiport tubing for use in automobile air conditioner heat exchangers. The tubing is a flat body with a row of side-by-side passageways, which are separated by upright webs. Processing of this tubing involves extrusion, a straightening and cutting operation, assembly and furnace brazing of the condenser. This invention improves the grain size of the metal in the tubing and also improves the metallurgical strength of the tubing. Ports are formed in the tubing during extrusion. These ports are separated by webs and the webs are extruded so that they have a reduced thickness at their centers. In response to successive cold working of the body, the webs are changed in shape to a more uniform thickness state. Stated other wise, in this invention, the webs are initially of hour glass shape such that when there is five percent change in material thickness, the strain is concentrated at the center of the web and results in at least fifteen percent cold work. With fifteen percent cold work or more, the amount of grain growth is controlled and the improvement in the metallurgical strength is achieved.

The invention relates to a method for manufacturing pipe steel. The pipe steel comprises the following components in percentage by weight: 0.02-0.12 percent of C, 0.10-0.35 percent of Si, 1.40-2.00 percent of Mn, no more than 0.015 percent of P, no more than 0. 005 percent of S, 0.021-0.05 percent of Ti, 0.05-0.40 percent of Cr, 0.05-0.30 percent of Mo, 0.10-0.30 percent of Cu, 0.10-0.24 percent of Ni, no more than 0. 008 percent of N, 0.02-0.07 percent of Nb, 0.01-0.08 percent of V and the balance of Fe and inevitable impurities. The method comprises the steps of smelting, external refining, casting, slab reheating, controlled rolling, controlled cooling, quenching and tempering in a converter or an electric furnace. The reheating temperature of the slab is 1100-1250 DEG C. The controlled rolling comprises a recrystallization zone rolling step and a non-recrystallization zone rolling step. The quenching and tempering comprises a quenching step and a tempering step. The pipe steel has the characteristics of high strength, excellent low temperature impact toughness and excellent weldability, and can be used for constructing long-distance petroleum and natural gas transmission pipelines, slurry transmission pipeline, city pipeline networks and the like.

The invention discloses a high-strength and high-toughness oil casing and a manufacturing method thereof. A 'HFW(High Frequency Welding)+welding line on-line thermal treatment+hot tension reducing+whole casing thermal treatment' technology is used for manufacturing a Q125 steel grade oil casing, and the weight percentage of chemical components are as follows: C: 0.18-0.30; Sh: 0.10-0.35; Mn: 1.00-1.30; P: not more than 0.018; S: not more than 0.008; Cr: 0.20-1.20; Mo: 0.20-0.55; Nh: 0.10-0.56; B: 0.0010-0.0015; Nb+V+Ti: not more than 0.08; and the balance of Fe and unavoidable impurities. For the Q125 oil casing produced by the manufacturing method, the yield strength is not less than 865MPa, the tensile strength is not less than 940MPa, the specific elongation is not less than 23.2%, at 0 DEG C, the full-scale transverse impact energy is not less than 105J and the longitudinal impact energy is not less than 110J. The Q125 steel grade oil casing produced by the technology is excellent in comprehensive performance, and has excellent high toughness and high plasticity.

The invention belongs to the technical field of ceramic kiln furniture and provides a corundum-mullite load bearing board and a preparation method. The corundum-mullite load bearing board comprises raw material compositions in the following mass percentage: 70 to 85 percent of alpha-Al2O3 particle material with the grain diameter of between 5 and 0.088 mm, 5 to 15 percent of alumina-silica sol fine powder with the grain diameter less than 0.08 mm, 5 to 15 percent of fused mullite fine powder with the grain diameter less than 0.088 mm, and 3 to 5 percent of bonding agent which is externally added. The characteristics of high purity and small particle size of alumina-silica sol are utilized to prepare the high-temperature creep-resistant load bearing board which has high purity and is formed by large-grained mullite bonded with corundum through high-temperature calcination, and the load bearing board does not deform and has good thermal shock resistance when the load bearing board is used at high temperature, and can be taken as the load bearing board used at a temperature higher than 1,650 DEG C in the fields of electronic ceramics and high temperature ceramics.