95results about How to "Effective pinning" patented technology

The invention relates to a method for producing an X80 grade large deformation resistant pipeline steel medium plate. The economic component design with low carbon is adopted to perform controlling and rolling stages on ingot, namely rolling the grain refined zone and the non grain refined zone. The method comprises: firstly, air cooling and relaxing after finished rolling is performed so that the temperature of a steel plate before entering water and cooled is reduced below the phase change point Ar3 between 30 and 50 DEG C, and 50 to 70 percent of austenite in the relaxing process is converted into proeutectoid ferrite; and secondly, laminar flow cooling is performed on the steel plate within the range of the cooling speed between 20 and 35 DEG C per second, the finished cooling temperature is controlled within the range of between 250 and 400 DEG C; and in the water cooling process, the remaining austenite is converted into bainite structure, and proeutectoid ferrite + bainite double-phase structure is obtained. The intensity and the plasticity index of the finished product satisfy the following requirements: the yield strength Rt0.5 is 530 to 630MPa, the intensity of tension Rm is 625 to 825 MPa, the yield ratio Rt0.5/Rm is less than or equal to 0.80, and the homogeneous deformation tensile stretch UEL is more than or equal to 10 percent.

The invention relates to low-cost non-rare-earth type high-strength magnesium alloy and a preparing method thereof. The alloy is Mg-Bi-Ca-Mn magnesium alloy, and is prepared from, by mass, 2-10% of Bi, 0.1-1.5% of Ca, 0.1-1.0% of Mn and the balance magnesium. The novel magnesium alloy is based on a Mg-Bi binary metal series, the element Bi serves as the main alloy element, and the Mg3Bi2 phase with high melting point is contained in the magnesium alloy. Furthermore, the magnesium alloy is evenly dispersed and distributed on a matrix through a simple alloying means, the metamorphism to a second phase by the element Ca and the element Mn and the combination of a plastic deformation processing means so that crystal boundary migration can be effectively pinned in the deformation process to hinder dislocated movement, grains are obviously refined, the strength of the alloy is greatly improved, and thus the ultra-high-strength magnesium alloy is developed in the alloy series.

The invention relates to cerium lanthanum high-strength corrosion resistant die casting magnesium alloy and is characterized in that the components and the weight percentage of the alloy are provided as follows: 8.5 to 9.5 percent of Al, 0.4 to 0.9 percent of Zn, 0.2 to 0.6 percent of Mn, 0.01 to 1.5 percent of rare earth Ce, 0.01 to 1.5 percent of La, and impure elements of less than or equal to 0.02 percent of Fe, less than or equal to 0.002 percent of Cu, less than or equal to 0.01 percent of Si, less than or equal to 0.001percent of Ni and the allowance is magnesium. The used alloying materials are cerium lanthanum rare earths which are left after separating Nd and Pr from ordinary cerium-rich mischmetals; at present, the rare earth materials are in a position of cheapness and large overstock in the market. The cerium lanthanum high-strength corrosion resistant die casting magnesium alloy avoids the waste of the rare earth resources; the mechanical properties and plasticity of the alloy are both better than AZ91 alloy and the corrosion resistance can be improved by a plurality of times or dozens of times.

The invention provides strain design based economical pipe line steel and its manufacturing method. The steel comprises the following ingredients of: by weight, 0.06-0.10% of C, 0.1-0.6% of Si, 1.0-2.0% of Mn, P being less than or equal to 0.015%, S being less than or equal to 0.003%, 0.1-0.3% of Cr, 0.01-0.10% of Nb, 0.005-0.03% of Ti, 0.01-0.06% of Al, N being less than or equal to 0.012%, 0-0.5% of Cu, 0-0.5% of Ni and the balance being Fe. The method provided by the invention comprises steps of smelting, secondary refining, casting and hot rolling, and is characterized in that slab heating temperature is 1050-1280 DEG C; controlled rolling temperature in a recrystallization zone is 900-1250 DEG C; controlled rolling temperature in a non-recrystallization zone is 750-950 DEG C; initial cooling temperature is 680-800 DEG C; finish cooling temperature is 100-500 DEG C; and cooling rate is 5-35 DEG C/s. According to the invention, elements of Mo, V, B and the like are not added, and the total amount of Cu, Cr and Ni is low. In addition, subsequent heat treatment is not required, the process is simple and requires low cost, and production efficiency is high. The steel plate not only has high strength but also has low yield ratio and high uniform extension features. By the adoption of the steel, safety of pipeline operation and economy of pipeline construction can be greatly raised.

The invention discloses strain design based pipe line steel X70 and its manufacturing method. the steel comprises the following ingredients of: by weight, 0.06-0.10% of C, 0.1-0.6% of Si, 1.0-2.5% of Mn, P being less than or equal to 0.015%, S being less than or equal to 0.003%, Cr being less than 0.1%, 0.05-0.35% of Mo, 0.01-0.15% of Nb, 0.005-0.03% of Ti, 0.01-0.06% of Al, one or two components selected from 0-0.5% of Cu and 0-0.5% of Ni, and the balance Fe and unavoidable microscale impurities. The manufacturing method is characterized in that slab heating temperature is 1050-1280 DEG C by a controlled rolling and controlled cooling method; the temperature for controlled rolling in a recrystallization zone is controlled within the range of 900-1250 DEG C; the temperature for controlled rolling in a non-recrystallization zone is controlled within the range of 700-950 DEG C; initial cooling temperature is 650-800 DEG C; finish cooling temperature is 100-500 DEG C; and cooling rate is 5-35 DEG C/s. According to the invention, elements of V, B and the like are not added, and the total amount of Mo, Cu, Cr and Ni is low. In addition, subsequent heat treatment is not required, the process is simple and requires low cost, and production efficiency is high.

The invention discloses a preparation method of a rectangular multicore composite superconductive strip. The preparation method comprises the following steps of step one. preparing mixed slurry by using amorphous boron powder, magnesium powder and a malic acid ethanol solution; step two. preparing tubing precursor powder; step three. tubing, carrying out rotary swaging, and drawing, thus obtaining a Cu-Nb-MgB2 single-core rod; step four. placing the Cu-Nb-MgB2 single-core rod and a Cu-NbTi single-core rod in a Cu-Ni alloy tube for secondary packaging, thus obtaining a secondary complex; five. processing the secondary complex into a wire rod, then carrying out rotary swaging and drawing so as to obtain a rectangular multicore composite strip; step six. winding a high-silica glass fiber to form a disk, and clamping the two ends of the disk to be flat; and step seven. carrying out thermal treatment so as to obtain the rectangular multicore composite superconductive strip. Compared with a single MgB2 and NbTi superconducting material, the composite superconductive strip prepared by the method is relatively wide in temperature using range and has relatively high using magnetic field.

This invention discloses a method for preparing Mg alloy with high strength and high plastic deformation. The compositions of the Mg alloy are: Zn 4.5-5.5 wt.%, Ce 0.5-2.5 wt.%, Ti 0.01-0.20 wt.%, Si less than or equal to 0.08 wt.%, Fe less than or equal to 0.01 wt.%, Cu less than or equal to 0.01 wt.%, Ni less than or equal to 0.002 wt.%, impurities less than or equal to 0.05 wt.%, and Mg as balance. The method adds rare earth element Ce to Mg-Zn-Zr alloy, and replaces Zr with Ti, thus can refine the alloy grains. Besides, Mg forms a dispersed reinforcing phase, which can effectively improve the comprehensive properties of the Mg alloy. The surface quality of the extruded product of the Mg alloy is obviously improved when compared with ZK series deformed Mg alloys. The average tensile strength, yield strength and elongation at breakage of the Mg alloy at room temperature are 360 MPa, 245 MPa and 7%, respectively. The average tensile strength and elongation at breakage of the Mg alloy at 150 deg.C are 250 MPa and 11%, respectively.

The invention belongs to the magnesium alloy material field and particularly relates to a high strength and toughness rare earth magnesium alloy. The invention solves the defects of low strength and plasticity of the Mg-Al base alloy which is widely used now. The alloy comprises the following elemental compositions by weight percent: 3-9% of Al, 0.2-0.6% of Zn, 0.1-0.5% of Mn, 0.05-1.0% of Ce, 0.05-1.0% of La, 0.1-3.0% of Y, 0.1-2.0% of Er, 0.1-2.0% of Ho, 0.004% or less of impurity element Fe, 0.002% or less of impurity element Cu, 0.02% or less of impurity element Si, 0.001% or less of impurity element Ni and the balance Mg. Through combined action of the elements and proper homogenizing treatment, the comprehensive performance of the alloy is significantly improved.

The invention relates to a preparation method for in-situ synthesizing of conical SiC crystal whisker through a coprecipitation and thermal evaporation technology. The preparation method comprises the steps of depositing a layer of carbon on a carbon fiber prefabricated body through a CVI method, filling defects on the surface of the prefabricated body and providing sufficient reaction raw materials; then putting the prefabricated body into a urea solution containing a catalyst to be dipped, calcining and reducing to obtain a nano catalyst; then suspending a sample containing the nano catalyst at the position of the top end in a graphite mold where silicon powder and carbon powder are loaded and evenly mixed and then obtaining the conical SiC crystal whisker through thermal treatment in certain temperature. The preparation method disclosed by the invention is simple, free of pollution, safe and stable, can effectively improve oxidation resistance, breaking tenacity and creep resistance of a composite material and combination strength between a base body and an enhanced body, can be applied to carbon/carbon, carbon/ceramic, magnesium-based and aluminum-based composite materials and has very good economical and social benefits.

The invention discloses a method for preparing a ceramic coating on the surface of a porous ceramic substrate, which includes: firstly, selecting a porous ceramic substrate and fine grinding; secondly, ultrasonically cleaning the porous ceramic substrate after fine grinding; thirdly, drying the cleaned porous ceramic substrate; and fourthly, selecting spraying materials for supersonic plasma spraying. The method can be used for preparing ceramic coatings on the surfaces of porous ceramic substrates, particles in the coating can be effectively and completely pinned in the substrate, the coatings and the substrates are firm in bonding, and preparation of a bottom layer or a transitional layer is not needed. Further, the method has the advantages of simplicity, flexibility, high efficiency and easiness in industrial application.

The invention pertaining to the technical field of high-strength steel plates for welding provides a method of improving the heat-affected zone toughness of a steel plate under a large heat input welding condition.CGHAZ toughness of a steel plate under a large heat input welding condition is improved on the basis of a CaO-MnS mechanism.HAZ toughness can be improved effectively by adding Ca into C-Mn steel, wherein, the Ca performs deoxidization through a gas-liquid interface for generating reactions of [Ca]+[O]=(CaO) and [Ca]+[S]=(CaS); fine dispersed nano-scale mass points of CaO and CaS are formed, MnS adheres to the mass points go grow to form a rotundity shape, and when the Ca content achieves to 50-60ppm, the HAZ toughness can be improved effectively.The invention has advantages of effective austenite grain boundary forming by nails, grains being fined and the CGHAZ toughness being improved.

The invention discloses an X80 pipeline steel plate for conveying coal-derived natural gas and a manufacturing method thereof. Steel comprises 0.019%-0.059% of C, 0.15%-0.45% of Si, 0.55%-1.85% of Mn,0-0.50% of Cu, 0-0.50% of Cr, 0-0.50% of Ni, 0.05%-0.35% of Mo, 0.03%-0.12% of Nb, 0.01%-0.04% of V, 0.008%-0.024% of Ti, 0.01%-0.04% of Al, 0-0.010% of P, 0-0.005% of S, and the balance Fe and unavoidable impurities, and S+P+O+N+H<=0.015%. The superheat degree of molten steel is 15-25 DEG C, the soft reduction rate is 2%-5%, and the drawing speed is 0.8-2.0 m/min. Two-section heating is adopted,rough rolling starting temperature is larger than or equal to 1000 DEG C, fine rolling starting temperature is 800-900 DEG C, fine rolling finish temperature is 750-850 DEG C, cooling starting temperature is 710-770 DEG C, cooling finish temperature is 460-600 DEG C, and the cooling speed is 5-20 DEG C/s. the steel plate has good strength, toughness and HIC resistance.

The high performance deformable magnesium alloy has the components including Mn 1.3-2.3 %, Ce 0.4- 1.2 %, Sr 0.1-0.5 %, Si not more than 0.05 %, Fe not more than 0.004 %, Cu not more than 0.025 %, Ni not more than 0.001 %, and Mg for the rest. The magnesium alloy with increased RE elements Ce and Sr amount has high mechanical performance and is suitable for intruding production.

The invention discloses a method for preparing compound MgB2 superconductor, and belongs to the technical field of MgB2 superconductor preparation. The method comprises the following steps: taking magnesium powder, boron powder and white phosphorus, milling with anhydrous ethanol, freezing into blocks with liquid nitrogen, conducting pulverization and sieving, then conducting stirring and preheating, adding an ignited magnesium rod, then heating, keeping heat and stirring, filtering to obtain a filtered matter, washing with a hydrochloric acid solution and distilled water, drying, mixing and grinding with graphene, conducting cold drawing to obtain a compound superconductor wire rod, and keeping heat in the xenon condition so as to prepare the compound MgB2 superconductor. The method has the benefits that the preparation steps are simple, the effective pinning center of the superconductor is effectively improved, the critical current density is increased by 12-16%, and the purity is increased by 25.6% or above; the fragility of the obtained product is less, the MgB2 core wire has no crack in the production process, and the material performance is good.

The invention relates to an alloy cored wire, in particular to a composite cored wire composed of solid calcium metal, silicon iron and titanium-silicon nitride alloy containing rare earth, barium and molybdenum. The cored wire comprises a core layer and a steel sheet layer wrapping the core layer. A meshed supporting layer made of steel or iron is arranged between the core layer and the steel sheet layer. The core layer comprises a silicon iron and titanium-silicon nitride alloy powder layer, a middle protecting layer and a solid calcium metal wire, wherein the solid calcium metal wire is wrapped with the middle protecting layer; the silicon iron and titanium-silicon nitride alloy powder layer wraps the middle protecting layer and is composed of silicon iron powder and titanium-silicon nitride alloy powder containing rare earth, barium and molybdenum; the particle size of the silicon iron powder and the particle size of the titanium-silicon nitride alloy powder are both below 3 mm; and the mass ratio of the solid calcium metal wire to the silicon iron powder to the titanium-silicon nitride alloy powder containing rare earth, barium and molybdenum is 1:(1-2):(2-5). Compared with a conventional calcium metal wire, the composite cored wire has the advantages of being higher in yield, longer in preservation time and more stable in yield, and also has significant economic benefits.

The invention relates to a high-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and a production method thereof. The method comprises the following steps: carrying out desulphurization, bessemerizing, RH vacuum refining and continuous casting on molten iron so as to obtain a continuous casting sheet billet; carrying out hot rolling on the continuous casting sheet billet so as to obtain a hot rolled sheet billet; rolling the hot rolled sheet billet so as to obtain hot-rolled steel coil; carrying out uncoiling and acid pickling on the hot-rolled steel coil; carrying out cold rolling on the hot-rolled steel coil subjected to acid pickling so as to obtain a cold-rolled steel plate; carrying out annealing and hot galvanizing on the cold-rolled steel plate in a continuous annealing furnace; and carrying out finishing processing on the annealed cold-rolled steel plate. The high-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate produced according to the method has good forming properties and mechanical properties, and can satisfy the requirements of cargo trucks on the stamping formability of steel plates.

The invention relates to high-plasticity magnesium alloy and a preparation method thereof. The alloy is Mg-Bi-Nd-Mn magnesium alloy, and comprises the following chemical components in percentages by mass: 2-8 wt% of Bi, 1.5-4 wt% of Nd, 0.05-0.15 wt% of Mn, and the balance of Mg and inevitable impurities, and moreover, the mass ratio of Bi to Nd equals to 1.3-2: 1. The process is simple, the plasticity of deformed magnesium alloy at the room temperature is excellent, the ductility at the room temperature reaches 43% or above, and meanwhile, the flame retardant property is good.

The present invention provides a high-strength deformation magnesium alloy material having a stable fine-grained structure. The alloy comprises the following components by weight: zincium of 8.5%-9.5%, zirconium of 0.4%-0.8%, rare earth erbium of 0.4%-4.0% and magnesium and ineluctable foreign matters of the rest.Without applying especial processes such as equidistant channel extrusion pressing, fast cooling and the like, stable fine grain tissue of a size of 2-10mum can be obtained through a deformation process by a deformation apparatus of extrusion pressing, rolling, smithing and the like in the common industry, mechanical performances guidelines of materials such as strength, plastic property, work hardening index and the like can be adjusted effectively to satisfy the requirements of use characteristic and processability of finished products or half-finished products.

The invention relates to alloy core spun yarn, in particular to solid calcium metal, ferrosilicon and titanium-silicon nitride alloy powder composite core spun yarn. The solid calcium metal, ferrosilicon and titanium-silicon nitride alloy powder composite core spun yarn comprises a core layer and a sheet steel layer wrapping the outside of the core layer; a netlike supporting layer made of steel or iron is arranged between the core layer and the sheet steel layer; the core layer comprises a ferrosilicon and titanium-silicon nitride alloy powder layer, a middle protection layer and a solid calcium metal line; the solid calcium metal line is wrapped with the middle protection layer; the ferrosilicon and titanium-silicon nitride alloy powder layer wraps the middle protection layer and is composed of ferrosilicon powder and titanium-silicon nitride alloy powder of which the particle sizes are 3 mm or smaller; and the mass ratio of the solid calcium metal line to the ferrosilicon power to the titanium-silicon nitride alloy powder is 1:(1-2):(2-5). Compared with common solid calcium metal lines, the solid calcium metal, ferrosilicon and titanium-silicon nitride alloy powder composite core spun yarn has the advantages that the yield is higher, the preservation time is longer, the yield is more stable, and remarkable economic benefits are achieved.

The invention relates to an alloy cored wire and particularly relates to a titanium-silicon nitride alloy cored wire comprises a core layer and a steel sheet layer wrapped outside the core layer, wherein the core layer is made of titanium-silicon nitride alloy powder with particle size being smaller than 3mm; a net-shaped support layer made of steel or iron is arranged between the core layer and the steel sheet layer; the titanium-silicon nitride alloy powder is prepared from elements in percentage by mass. According to the titanium-silicon nitride alloy cored wire, the alloy powder is added into micro-alloyed steel by a method using the cored wire, so that the problem of low recovery rate can be solved; consumption of ferrosilicon and ferromanganese can also be reduced; the application of titanium-silicon nitride and cored wire alloys thereof can be developed; the titanium-silicon nitride alloy cored wire has remarkable economic benefit.