1641 results about "Pickling" patented technology

The invention belongs to the field of metal materials, and particularly relates to a 448 MPa grade hot-rolled pickled steel plate for an automobile and a production method of the 448 MPa grade hot-rolled pickled steel plate. The steel plate is mainly suitable for manufacturing automobile chassis structural parts. The steel comprises the following chemical components: C, Si, Mn, Al, Nb, Ta, Zr and Y, P is limited to be less than or equal to 0.015%, S is limited to be less than or equal to 0.005%, N is limited to be less than or equal to 0.003%, and the balance is Fe and inevitable impurities. The yield strength of the steel plate is larger than or equal to 308 MPa, the tensile strength is larger than or equal to 448 MPa, the transverse elongation A is larger than or equal to 42%, the hole expansion rate is larger than or equal to 125%, transverse cold bending is conducted by 180 degrees, D = a, the steel plate is qualified, the surface quality is good, oxide scale stripes and chromatic aberration defects are avoided, the surface roughness Ra is 1.00-1.40 micrometers, and the steel plate has good corrosion resistance.

The invention discloses a high-strength wear-resistant self-lubricating drill bit for a coal mine and a preparation method of the high-strength wear-resistant self-lubricating drill bit. The preparation process comprises the steps that a drill bit blank is prepared from low-alloy carbon structural steel, a high-strength and high-toughness matrix is obtained through thermal refining, and then sand blasting activation is conducted to clean and coarsen the surface. After diamond particles are subjected to acid pickling pretreatment, metal modified diamond composite powder is obtained through salt bath metal and reduction prefabrication. The preparation method comprises the following steps: mixing MoS2 with the carbon dioxide, spraying the mixture on the surface of a matrix through high velocity oxy-fuel to form a wear-resistant coating, and then improving the density and interface bonding strength of the coating through high-frequency induction instantaneous remelting, thereby finally obtaining the coal mine drill bit with high hardness, strong bonding force and self-lubricating performance. The metal modified diamond composite coating containing the metal transition layer and the MoS2 lubricating phase is constructed on the steel substrate, and a high-frequency remelting process is combined, so that the wear resistance, the bonding strength and the self-lubricating performance of the drill bit are synergistically improved, and the drill bit has the advantages of high strength and toughness matching and low cost.

The invention discloses a pickling-free cold heading Kovar alloy wire production process which comprises the following steps: S1, raw material preparation: preparing the following raw materials in percentage by mass: 41.5% of Ni, 0.5% of Co, less than or equal to 0.03% of C, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe; mixing the materials, and carrying out vacuum induction melting and electroslag remelting to prepare an alloy ingot; the alloy cast ingot is subjected to hot rolling treatment to form a hot-rolled wire rod with the diameter being 12.0-16.0 mm; s2, peeling treatment is conducted, specifically, surface layer defects of the hot-rolled wire rod in the step S1 are removed through a peeling machine; s3, dry-type drawing treatment is conducted, specifically, the hot-rolled wire rod treated in the step S2 is subjected to dry-type drawing through a dry-type drawing die to form an alloy wire; s4, intermediate annealing treatment is conducted, specifically, the alloy wire in the step S3 is placed in an annealing furnace, sufficient hydrogen is input into the annealing furnace, intermediate annealing is conducted under the hydrogen protection atmosphere, the annealing temperature is 950-1100 DEG C, and the annealing walking speed is 3-5 m / min; the surface quality and the size consistency of the wire can be improved, meanwhile, the defects of environmental pollution, hydrogen embrittlement and the like are reduced, and the use requirements of high-end precise cold heading parts are met.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The invention discloses high-grade non-oriented silicon steel and a preparation method thereof, and relates to the technical field of non-oriented silicon steel. The high-grade non-oriented silicon steel comprises the following components in percentage by weight: less than or equal to 0.002% of C, 3.0-3.6% of Si, 0.15-0.25% of Mn, 0.05-0.20% of Als, less than or equal to 0.001% of S, less than or equal to 0.015% of P, less than or equal to 0.0015% of N, less than or equal to 0.002% of Ti and the balance of Fe and inevitable impurities. The manufacturing method of the high-grade non-oriented silicon steel in the claim 1 sequentially comprises the following steps of converter smelting, RH refining, continuous casting, heating, hot rolling, coiling, normalizing, acid pickling, cold rolling, annealing and coating. Wherein the heating temperature is controlled to be 1110 DEG C to 1200 DEG C; the hot rolling comprises rough rolling and finish rolling, and the hot rolling temperature is controlled to be 900-1000 DEG C; the coiling temperature ranges from 550 DEG C to 600 DEG C; the normalizing temperature ranges from 850 DEG C to 970 DEG C; the total reduction rate of cold rolling is 80-87%; and the annealing temperature ranges from 840 DEG C to 960 DEG C. According to the invention, through precise control of chemical components and a two-stage annealing process, collaborative improvement of low iron loss and high magnetic induction is realized.

The invention belongs to the technical field of material preparation, and particularly discloses a carbon nanotube purification method which comprises the following steps: mixing a carbon nanotube crude product with a solvent, and then shearing to obtain a pretreated carbon nanotube; and oxidizing the pretreated carbon nano tube, and then performing acid pickling to obtain the purified carbon nano tube. According to the purification method disclosed by the invention, shearing treatment is introduced to mechanically activate the carbon nanotubes, and is combined with subsequent oxidation and pickling processes to efficiently remove impurity carbon in the carbon nanotubes, so that the purification method is simple, remarkable in purification effect and high in purification efficiency, the purity of the carbon nanotubes can be greatly improved, the damage to the structure of the carbon nanotubes is small, and the method is suitable for industrial production. The method is suitable for large-scale industrial production.

The invention discloses a preparation method of copper-based composite powder with high infrared laser absorptivity and a reaction device of the copper-based composite powder, and belongs to the technical field of metal additive manufacturing. The preparation method of the copper-based composite powder comprises the following steps that copper powder is subjected to acid pickling pretreatment, Cu2O-coated Cu powder is prepared through air suspension dynamic etching, the Cu2O-coated Cu powder is purified, and the prepared composite powder is of a core-shell structure and comprises a copper core and a cuprous oxide modified shell wrapping the surface of the copper core; by means of the structure, the absorptivity of the copper powder to near-infrared laser of 1064 nm and the like can be remarkably improved to 30% or above, and therefore the problems that pure copper is poor in melting and multiple in forming defect due to high reflectivity in laser additive manufacturing are effectively solved. The composite powder can be directly used for existing selective laser melting or directional energy deposition equipment, has great significance in achieving high-density copper part forming under medium power, and is convenient to prepare, low in cost and high in practicability.

The invention belongs to the field of steel pipes, and particularly relates to a method for manufacturing a cold drawn pipe, which comprises the following steps of: obtaining a raw material steel pipe which comprises the following elements in percentage by weight: less than or equal to 0.20 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, less than or equal to 0.30 percent of Cr, less than or equal to 0.50 percent of Ni, less than or equal to 0.10 percent of Mo, 0.05-0.15 percent of V and the balance of Fe; the method comprises the following steps: pretreating a raw material steel pipe, wherein the pretreatment sequentially comprises acid washing, alkali washing, water washing, phosphating, water washing and saponification; and carrying out cold drawing and annealing on the pretreated steel pipe to obtain the cold-drawn pipe. The invention also relates to the cold drawn pipe. According to the method disclosed by the invention, pollution between bath solutions in pretreatment is reduced, the surface quality after pretreatment is improved, and the upper yield strength, tensile strength and normal-temperature impact absorption energy of the cold-drawn pipe are improved, so that the cold-drawn pipe has relatively good toughness and welding performance.

The utility model provides a silicon carbide powder pickling device, which relates to the field of silicon carbide processing, and comprises a plurality of supporting legs, the outer surface of each supporting leg is fixedly connected with a first bracket, and the equipment comprises a transmission system consisting of a first motor, a transmission rod, a rotating disc, a rotating rod, a push-pull rod, a limiting bracket, a transmission arm and the like. Complex and accurate relative movement of the first bulkhead and the second bulkhead is achieved, compared with existing equipment, the transmission design can more effectively break the agglomeration phenomenon of powder in the acid pickling process, it is ensured that each powder can be fully exposed in acid liquor, the uniformity and thoroughness of acid pickling are greatly improved, and the production efficiency is improved. By means of the synergistic effect, the powder and the acid liquor can be more fully mixed within a shorter time, the pickling reaction process is accelerated, the pickling efficiency is remarkably improved, the powder can be promoted to rapidly pass through the screen through the motion modes of swinging, vibration and the like of the partition frame, and the period of the whole pickling technological process is greatly shortened.

The utility model relates to the technical field of water dispensers, and discloses a hydrogen-rich water machine adopting a gas-water separation hydrogen melting technology, which comprises a first purification module, a mineralization module, a magnetization module and a hydrogen melting module which are connected in sequence, the hydrogen production module is connected between the first purification module and the hydrogen melting module in parallel; the mineralization module comprises a first activated carbon filter element, a second activated carbon filter element, a PP cotton composite filter element and a carbon rod filter element which are connected in sequence; the first activated carbon filter element is not subjected to acid pickling; the second activated carbon filter element is subjected to acid pickling. The hydrogen-rich water machine for providing the gas-water separation hydrogen melting technology, provided by the utility model, can be used for carrying out multi-section filtration and improving the mineralization effect.

The invention discloses a high-surface-quality invar alloy cold-rolled steel strip and a manufacturing method thereof.The manufacturing method comprises the working procedures of acid pickling, cold rolling and pre-pressing, coping, cold rolling and rolling, cleaning, annealing, leveling, shearing and packaging, the surface of an invar alloy hot-rolled steel coil is subjected to acid pickling through a mixed acid solution, cold rolling and pre-pressing are conducted through three-pass cold rolling and rolling, and the surface quality of the invar alloy hot-rolled steel coil is improved. At least three pairs of grinding heads are adopted for grinding, the grinding frequency is not less than 3 times, multi-pass cold rolling is carried out after grinding, the number n of rolling passes meets the condition that n is larger than or equal to 0.5 * m + 1, m is the thickness of the ground cold-rolled steel strip, and the unit is mm. According to the method, the technical problems that the surface quality of the invar alloy cold-rolled strip is difficult to control, the requirement is high and the like can be effectively solved, invar alloy products with high surface quality and high plate shape requirement are prepared, and the high-surface-quality use requirement of a user is met.

The invention discloses a rinsing process for deep cleaning of purified natural quartz, which comprises the following steps: putting acid-washed quartz sand into a cleaning medium tank containing a mixed cleaning solution of deionized water and absolute ethyl alcohol for cleaning, and applying ultrasonic waves in the cleaning process; the cleaned quartz sand is put into a cleaning medium tank containing a mixed cleaning solution composed of deionized water, hydrogen peroxide and hydrofluoric acid to be cleaned, and ultrasonic waves are applied in the cleaning process; and the cleaned quartz sand is put into a cleaning medium tank containing deionized water to be rinsed so as to remove acid pickling residues to achieve deep cleaning, and ultrasonic waves are applied in the cleaning process. According to the method, a three-step cleaning scheme is innovatively adopted, so that loose impurities on the surfaces of quartz sand particles and organic reagent residues of a flotation process are efficiently stripped; the three steps are clear in function and have a synergistic effect, and the cleaning effect is far better than that of traditional single washing.

The invention discloses a purification and recovery process for cooperatively treating fly ash and waste incineration flue gas. The purification and recovery process comprises the following steps that S1, the waste incineration flue gas is subjected to cooling and heat energy recovery; s2, spraying activated carbon; s3, fly ash is captured; s4, spraying water to remove HCl, and collecting hydrochloric acid wastewater; s5, spraying alkali liquor to remove SO2, and collecting deacidified waste liquid; s6, the fly ash is subjected to acid pickling treatment with hydrochloric acid wastewater, and acid-pickled mud cakes are obtained; s7, carrying out water washing treatment on the acid-washed mud cake to obtain a water-washed mud cake; s8, treating the wastewater to obtain sodium chloride and potassium chloride; and S9, the washed mud cake is mixed with the gelling and curing base material, the mixture is cured and mixed with fresh garbage to be incinerated, and obtained ash residues are directly used as building materials. The production of fly ash is reduced from the source, the treatment cost of the fly ash is low, resource utilization is realized, and the problems of heavy metals and dioxin are solved; and heat energy is recycled, the heat energy utilization efficiency is improved, and the economical efficiency is enhanced.

The invention relates to the technical field of quartz sand purification, in particular to a high-purity quartz sand purification method based on multi-parameter fusion, which comprises the following steps: judging whether to enter first flotation purification or not based on a comparison result of a particle size index numerical value corresponding to a particle mixture to be purified and a particle size index threshold value, and if not, starting second crushing; determining a first impurity removal rate according to the data set after the first flotation if the first impurity removal rate is judged to enter, and comparing the first impurity removal rate with a first impurity removal threshold value so as to judge whether the first pickling purification is entered or not; if not, secondary flotation purification is started; and if it is judged that the process enters, determining a second impurity removal rate according to the data set after the first pickling, and comparing the second impurity removal rate with a second impurity removal threshold to judge whether purification is completed or not, and if the purification is not completed, starting second pickling purification. The quartz sand purification process can be dynamically judged and precisely regulated and controlled, and the purification efficiency of the high-purity quartz sand is effectively improved.

The application belongs to the field of high-entropy alloys, and particularly relates to a preparation method of an ultra-high strength and plasticity product Fe50Mn30Co10Cr10 alloy. Firstly, a cast slab is prepared through vacuum induction melting, then the cast slab is subjected to multi-pass hot rolling with a reduction ratio of 70% to 75%, and after pickling, the cast slab is subjected to multi-pass warm rolling with a reduction ratio of 80%, and finally, high-temperature short-time annealing is carried out at 1050 to 1150 DEG C to obtain a final annealing plate. In the application, the phase transformation behavior in the alloy deformation process is inhibited by controlling the hot rolling and warm rolling temperatures, and the rolling plasticity of the material is improved. Meanwhile, by optimizing the annealing process, the grains are refined as much as possible, and a certain dislocation density is retained, and the strength and plasticity of the alloy are improved through the comprehensive action of multiple strengthening mechanisms. The prepared Fe50Mn30Co10Cr10 alloy has a tensile strength of 1050 to 1280 MPa, an elongation of 35% to 58%, and a strength and plasticity product of 40 to 73 GPa.

The utility model discloses nickel recovery equipment. The nickel recovery equipment comprises an adjusting mechanism, an adsorption mechanism, a pickling mechanism and a control device, the adjusting mechanism comprises an adjusting device, a filtering device and a source water device, the water outlet end of the adjusting device is in butt joint with the water inlet end of the filtering device, and the water outlet end of the filtering device is in butt joint with the water inlet end of the source water device; the adsorption mechanism comprises a resin tower, an alkali liquor storage device and an alkali adding pump, and the resin tower is provided with a spectrophotometer; the pickling mechanism comprises an acid liquid storage device, an acid adding pump and a saturated liquid collecting device; and the control device is electrically connected with the adjusting mechanism, the adsorption mechanism and the pickling mechanism. Through the nickel recovery equipment, the nickel recovery efficiency can be improved, the nickel recovery equipment is convenient and rapid, meanwhile, resin regeneration is achieved, continuous production is achieved, the production benefit is improved, and the production cost is reduced.

The invention discloses a preparation method and application of a low-temperature photovoltaic welding strip, and belongs to the technical field of energy conservation and environmental protection. According to the technical scheme, the method comprises the steps that a metal precursor is dissolved in an alcoholic solution, and a nano reinforced phase is prepared through regulation and control of a surfactant, ultrasonic treatment and aging calcination; the composite solder is prepared through argon smelting according to 1-6 parts of Sn, Bi, Ag, Ni, Cu, Ge, the modified glass powder and the nano reinforced phase; 99.95% electrolytic copper is subjected to vacuum melting and cold rolling to form a copper strip; the surface roughness is controlled through alkali washing degreasing and acid washing micro-etching; immersing the preheated copper strip into a molten pool for plating; and carrying out heat preservation and rosin protection treatment. According to the method, low-temperature welding at the temperature of 150-220 DEG C is achieved, an Ag-Sn intermetallic compound layer is formed after welding, the pull-off strength retention rate of a welding spot is larger than or equal to 80% after 200 times of thermal cycles, and the method is suitable for interconnection of crystalline silicon photovoltaic battery pieces.

The invention discloses an aluminum alloy hard oxidation process, and relates to the technical field of aluminum alloy part surface treatment, the aluminum alloy hard oxidation process comprises the following steps: S1, pretreatment: oil removal, alkali corrosion treatment and acid pickling neutralization; s2, hard oxidation is conducted, specifically, the pretreated workpiece is put into an oxidation tank with electrolyte and a stirring system to be subjected to stirring and oxidation treatment; and S3, post-treatment: cleaning with hot water, sealing with nickel acetate and drying in a drying oven. The process mainly comprises the following steps: carrying out pretreatment of oil removal by an organic solvent, alkali etching and acid pickling, combining sulfuric acid-citric acid-monopotassium phosphate composite electrolyte, pulsed power supply and gradient boosting oxidation, carrying out ultrasonic stirring and precise temperature control hard oxidation, and finally carrying out nickel acetate sealing aftertreatment. The four industrial problems of poor batch consistency of oxidation films of aluminum alloy workpieces, non-uniformity of complex workpieces, high energy consumption and poor compatibility to high alloy materials are thoroughly solved, and the oxidation film which is high in hardness, uniformity and corrosion resistance and saves energy is obtained.

The invention discloses a cyclic regeneration treatment method of stainless steel pickling waste liquid, which realizes full-flow recycling of the pickling waste liquid by constructing a closed-loop system of pretreatment, adsorption, desorption, recovery, regeneration and circulation. A molecularly imprinted polymer adsorption technology is adopted, targeted capture of Cr < 3 + >, Ni < 2 + > and Fe < 2 + > / 3 < + > is achieved through specific recognition sites, and the bottleneck that a traditional adsorbent is poor in selectivity is broken through; the supercritical CO fluid extraction technology utilizes the characteristics of high diffusivity and low surface tension, efficient desorption of metal ions is achieved under mild conditions, and secondary pollution caused by a traditional organic solvent is avoided. A technical closed loop is formed among the steps through parameter synergy and substance circulation, and finally the dual purposes of full-amount regeneration of the pickling waste liquid and efficient recovery of metal resources are achieved.

The invention discloses a production method of a high-yield 1000MPa-grade ultrahigh-strength galvanized dual-phase steel strip. The production method comprises a smelting-continuous casting process, a hot rolling process, an acid pickling and cold rolling process, a continuous hot galvanizing process and a finishing process. The steel comprises the following chemical components in percentage by mass: 0.11%-0.15% of C, less than or equal to 0.40% of Si, 2.60%-2.85% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.015%-0.060% of Alt, 0.10%-0.30% of Cr, 0.025%-0.040% of Nb, 0.010%-0.025% of Ti, 0.0008%-0.0020% of Ca, less than or equal to 0.0070% of N and the balance of Fe and impurities. The galvanized dual-phase steel strip which is high in yield, ultrahigh in strength and good in corrosion resistance and meets the characteristic requirements of safety, low energy consumption and light weight in the automobile industry.

The invention relates to the technical field of material sealing, in particular to a high-performance insulating ceramic sealing method for a neutron tube, which comprises the following steps: sequentially carrying out organic solvent ultrasonic cleaning and argon plasma etching activation treatment on a sealing surface of a cylindrical high-purity aluminum oxide ceramic piece, and depositing a titanium transition layer through magnetron sputtering, the ceramic piece with the titanium transition layer is obtained; the sealing face of the kovar alloy cylindrical flange plate is subjected to acid pickling, an oxide layer is removed, cleaning and drying are conducted, and a metal sealing part is obtained; preparing an active brazing filler metal sheet; the components are assembled in sequence to form a pre-assembled component; the pre-assembled component is placed in a vacuum brazing furnace, axial pre-tightening force is applied to the pre-assembled component, sealing is completed, then cooling is controlled, and a sealing piece with an airtight brazing joint is formed; and carrying out annealing treatment to obtain a finished product sealing assembly. Therefore, the problems of low dielectric strength, large thermal expansion coefficient difference, difficulty in interface quality control and the like in the prior art are solved.

The utility model provides a multifunctional hoisting cleaning device which is characterized in that a framework supports a platform, an acid liquor tank, an alkali liquor tank, a clear water tank and a buffer tank are mounted on a base, a tank body is mounted in the framework platform, and a top cover is arranged on the tank body; a spraying pipeline and a gas washing pipe are mounted on the inner surface of the tank body, a lifting pump and a filter are connected to the inlet end of the spraying pipeline, a rotary spray head is arranged on the spraying pipeline, a limiting frame is mounted in the tank body and arranged on the outer side of the spraying pipeline, a hoisting workpiece frame is hoisted and placed in the limiting frame, and a cleaning workpiece is placed in the hoisting workpiece frame; the spraying pipeline comprises a bottom surface spraying pipeline, a vertical surface spraying pipeline and a top surface spraying pipeline which are communicated with one another, an acid liquor tank, an alkali liquor tank, a clear water tank, a buffer tank and a gas washing pipe are respectively connected into the cleaning spraying pipeline through quick connectors, acid washing, alkali washing, clear water washing and gas washing treatment are carried out on the surface of a large workpiece, multifunctional cleaning is integrated, the workpiece is convenient to hoist, manpower and material resources are saved, and the working efficiency is improved. And different types of cleaning can be completed without repeated carrying.

The invention discloses electroplating equipment for pressure vessel production, which belongs to the technical field of pressure vessel electroplating, and comprises a main body mechanism for clamping a pressure vessel and electroplating the inner wall of the pressure vessel, the main body mechanism is provided with a cleaning mechanism for polishing and cleaning the inner wall of the pressure container and a pickling mechanism for pickling the pressure container; according to the invention, the unique track module in the main body mechanism is matched with the lifting electric cylinder, the lifting ring and the inner convex ball, so that the automatic and accurate conversion of the pressure vessel among grinding, pickling, electroplating and loading and unloading stations is realized, the real automatic circulating production is realized, and the production efficiency is greatly improved; according to the main body mechanism provided by the invention, in the electroplating process, through the design that the upper pressing seat and the opening end of the pressure container are automatically sealed and matched and the pressing-in plate is pressed downwards to enable electroplating liquid to enter the electroplating inner pool from the electroplating outer pool, gas in the container can be effectively and forcibly exhausted, and it is ensured that a high-quality coating is obtained on the inner wall of the container.

The invention relates to an automotive frame steel plate with tensile strength of 750MPa and a hot rolling control method thereof, and belongs to the technical field of iron-based alloys. The steel plate comprises the following chemical components in percentage by mass: 0.05-0.08% of C, 0.1-0.3% of Si, 1.7-2.0% of Mn, less than or equal to 0.025% of P, less than or equal to 0.0030% of S, 0.05-0.1% of Ti, 0.04-0.08% of Nb, less than or equal to 0.0060% of N, 0.02-0.06% of Al, 0.3-0.7% of Mo, less than or equal to 0.0050% of Ca and the balance of iron and inevitable impurities. During hot rolling, the continuous casting sheet billet is controlled to be heated to 1250-1350 DEG C and then rolled, the rough rolling finish rolling temperature is 1050-1000 DEG C, the finish rolling finish rolling temperature is 880-900 DEG C, the reduction rate is larger than or equal to 60%, laminar cooling after rolling adopts front-section cooling, the cooling speed is 40-50 DEG C / s, and a hot rolled steel coil is obtained through coiling when the coiling temperature is 600-650 DEG C. Through proper chemical component design and hot rolling process condition control, the high-strength hot-rolled acid-washed automobile beam steel plate with the yield strength of 700-800 MPa and the tensile strength of 770-850 MPa is obtained.

The invention discloses a preparation method of TiO2 powder with a rutile and anatase core-shell structure, and particularly relates to the technical field of photocatalytic material preparation. According to the method, rutile phase TiO2 powder is used as a core material, a titanate intermediate layer is formed on the surface of a particle through an accurately controlled hydrothermal alkali treatment process, and then a surface layer phase is converted into an anatase phase through acid pickling treatment and controllable heat treatment, so that a complete core-shell heterojunction structure is constructed. The process flow is relatively simple, the cost is controllable, the phase structure conversion rate is high, and the shell thickness can be accurately regulated and controlled. The obtained TiO2 core-shell structure powder has excellent structural stability of a rutile phase and high surface reaction activity of an anatase phase, and shows remarkably enhanced photocatalytic degradation performance under the condition of ultraviolet irradiation, and the catalytic efficiency of the TiO2 core-shell structure powder is greatly improved compared with that of single rutile phase TiO2; and a new process method is provided for large-scale preparation of efficient photocatalytic materials.

The invention discloses a production method of low-cost cold-rolled dual-phase steel DP980 with yield strength of 550-760 MPa, which comprises the following steps: (1) smelting and continuous casting: molten steel for a casting machine comprises the following components in percentage by mass: 0.090-0.120% of C, 0.40-0.60% of Si, 2.40-3.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.015-0.045% of Alt, 0.10-0.30% of Cr, 0.020-0.045% of Nb, 0.015-0.035% of Ti, 0.0008-0.0030% of Ca and 0.0030-0.0070% of N; (2) hot rolling; (3) pickling and cold rolling; and (4) continuous annealing and leveling. The cold-rolled dual-phase steel disclosed by the invention has the characteristics of low yield ratio, high elongation percentage, excellent formability and the like.

The invention discloses a production method of 590MPa-grade high-fatigue-resistance acid pickling rim steel. The production method comprises the working procedures of smelting, continuous casting, hot rolling and acid pickling. Key process control and parameters are disclosed; the high-fatigue-resistance pickling rim steel comprises the following chemical components in percentage by mass: 0.06%-0.10% of C, less than or equal to 0.08% of S i, 1.20%-1.60% of Mn, less than or equal to 0.018% of P, less than or equal to 0.003% of S, 0.020%-0.060% of Alt, 0.030%-0.055% of Nb, 0.010%-0.040% of Ti, less than or equal to 0.0050% of N, less than or equal to 0.0020% of O, and the balance of Fe and impurities, wherein T i is greater than 3.42 N + 3S. The steel provided by the invention not only has high strength and good formability, but also has excellent high cycle fatigue resistance.

The present application relates to the technical field of steel plate production, and particularly relates to a production method of an extremely thin Nb-containing 355MPa-grade pickling plate, which comprises the following steps: 1) slab blanking: the difference between the slab width and the target width is controlled to be within 50mm, and the slab single weight is controlled according to the single steel rolling distance within 1150m; 2) heating: the air-fuel ratio of the heating furnace is set to be 1.8-2.0, the furnace atmosphere is controlled to be weak oxidizing, the furnace outlet temperature is 1220-1240 DEG C, the second heating section + soaking time is greater than or equal to 65min, the total in-furnace time is greater than or equal to 170min, and the interval between the steel tapping is greater than or equal to 160s; 3) rough rolling: the slab outlet does not use the SP width press, the rough rolling adopts two rolling mills, and each rolling mill is rolled for three passes; the descaling water is fed in each pass; 4) finish rolling: the finish rolling inlet temperature is controlled to be 1050-1080 DEG C, and the finish rolling temperature is within the range of 860-900 DEG C; 5) when the flatness defect occurs during the coiling, the cooling setting time is increased in the coiling drum. The present application guarantees the stable rolling and improves the surface quality of the steel plate.

The invention discloses a 7N single crystal copper preparation process based on zone melting and crystal orientation control, which specifically comprises the following steps: S1, raw material pretreatment: purifying 4N copper to 5N grade by adopting electrolytic refining of a nitric acid system, and the carbon content after acid pickling is less than or equal to 1ppm; the invention relates to the technical field of metal material preparation. According to the 7N single crystal copper preparation process based on zone melting and crystal orientation control, impurities in a material are redistributed in a melting zone through local heating, so that separation and removal of the impurities are achieved, in single crystal copper preparation, zone melting can remarkably reduce the content of the impurities in copper, the purity of the copper is improved, and the yield of the 7N single crystal copper is improved. By accurately controlling parameters such as the temperature gradient and the cooling rate in the smelting and solidification process, optimization of crystal orientation is achieved, single crystal copper with an ideal crystal structure can be obtained, the performance of the single crystal copper is improved, and impurities can be removed and crystal defects can be reduced through zone smelting; and crystal orientation control can optimize the crystal structure and improve the performance.

The invention belongs to the technical field of wire production, and particularly relates to a production process of a 95MnNbA steel wire for an ultrahigh-strength traction rope, which comprises the following steps: 1) taking a 95MnNbA steel wire rod as a raw material; 2) drawing a semi-finished product: performing circulating water cooling on a winding drum and a die box of a wire drawing machine in the drawing process, and controlling the temperature of a die to be lower than 90 DEG C; 3) heat treatment: ensuring that the wire temperature is in a range of 925-935 DEG C, and keeping the lead bath temperature in a range of 550-560 DEG C; 4) pickling the steel wire after heat treatment; (5) hot galvanizing, wherein the zinc temperature is controlled within the range of 450-460 DEG C; 11-12 passes are adopted for drawing of a wire drawing machine, the single-pass compression ratio of the first pass is controlled to be 15%-17%, the total compression ratio is controlled to be 85%-92%, the average compression ratio of all the passes is controlled to be 16%-18%, and a special wire drawing die is used as a wire drawing die of the last three passes.