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866 results about "Reduction rate" patented technology

Preparation method and application of unsaturated polyether

The invention relates to a preparation method and application of unsaturated polyether. The preparation method comprises the following steps: (1) adding unsaturated alcohol and a catalyst into a first reactor, replacing with nitrogen, continuously adding epoxide with short branches and reacting to obtain an intermediate product A, wherein the unsaturated alcohol is one or a mixture of more than two of methyl allyl alcohol and isoamyl alcohol at any proportion and the mass ratio of the unsaturated alcohol to epoxide is 1.0:(0.1-5.0); and (2) putting the intermediate product A obtained in the step (1) and the catalyst into a second reactor, replacing with nitrogen, continuously introducing ethylene oxide and reacting to obtain polyether B, and neutralizing the pH value of the polyether B product to be 5-7 with a neutralizing reagent, wherein the mass ratio of the intermediate product A to ethylene oxide is 1.0:(15.0-51.0). The invention also provides the unsaturated polyether prepared by the preparation method, which is disclosed by the invention and application of unsaturated polyether in synthesis of polycarboxylic water reducer and the water reducer prepared from the unsaturated polyether synthesized by the method has the advantages of low doping amount, high water reduction rate, good slump-retaining agent and like.
Owner:HONGBAOLI GRP CO LTD

Method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling

A method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling comprises that (1), a five-rack serial type cold continuous rolling is performed, a five-rack serial type cold continuous rolling unit is adopted, the diameter of a working roll of each rolling mill is 300-500mm, and endless rolling is performed; the roughness degrees of the rolls of the first rack to the fourth rack are in a range of 0.5-1.0mum and decrease sequentially; the working roll of the fifth rack is subjected to roughening and chromium plating treatment; an emulsion lubrication rolling mode is adopted, the temperature of an emulsion is 50-60DEG C, the emulsion is sprayed to roll gaps for cooling and lubricating, the temperature of cold-rolled band steel is controlled below 150DEG C; the accumulated reduction rate of the first rack to the fourth rack is larger than 60%, the reduction rate of the fifth rack is in a range of 4-10%, and the roughness of the cold-rolled band steel is controlled in a range of 0.5-1.0mum; (2), the cold-rolled band steel is subjected to annealing acid picking treatment, heating and annealing are performed in a continuous horizontal gas furnace, the annealing temperature is in a range of 800-1000DEG C, and recrystallization of the band steel is finished; finished surfaces are obtained finally through electrolytic picking by Na2SO4 and H2SO4 solutions and soaking picking by a nitric acid and hydrofluoric acid mixed acid solution sequentially after annealing.
Owner:BAOSTEEL DESHENG STAINLESS STEEL

Ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and manufacturing method of plate thereof

The invention relates to ultrafine grained hot rolled dual-phase steel with tensile strength of above 750MPa and a manufacturing method of a plate thereof, belonging to the technical field of steel rolling, and the dual-phase steel comprises the following chemical components by weight percentage: 0.06-0.16% of C, 0.10-0.50% of Si, 1.00-2.00% of Mn, 0.02-0.06% of Al, 0.01-0.08% of Nb, 0-0.03% of Ti, not more than 0.1 of P, not more than 0.05 of S and the balance of Fe. The manufacturing method of the dual-phase steel comprises the following steps: 1) heating, heating a plate blank with the thickness of not less than 60mm to 1100-1250 DEG C, and keeping the temperature for 1-4h; 2) rolling and adopting the two-stage controlled rolling, wherein the reduction rate in a recrystallization zone is larger than 60%, the reduction rate in a non-recrystallization zone is larger than 70%, the initial rolling temperature of the recrystallization zone is 1100-1150 DEG C, the initial rolling temperature of the non-recrystallization zone is 880-940 DEG C, and the final rolling temperature is 770-860 DEG C; and 3) cooling, and adopting the continuous cooling after final rolling, wherein the cooling rate is 30-40 DEG C/s, the coiling temperature is lower than 350 DEG C, and the thickness of a finished product is 2-10mm. The manufacturing method can obtain the high-performance steel plate with high strength, low yield-strength ratio and good extension property, and the steel plate can be suitable for forming processing of high-strength automobiles, other industrial mechanical parts and the like.
Owner:NORTHEASTERN UNIV

Wear and corrosion resistant castable prepared from bauxite-based homogenous material and preparation method thereof

ActiveCN101885617AUniform structureSmall fluctuations in water addition during constructionPliabilityCement kiln
The invention discloses wear corrosion resistant castable prepared from a bauxite-based homogenous material and a preparation method thereof, which belong to the technical field of castable refractory. In the invention, by using the characteristics of the bauxite-based homogenous material, such as homogeneous chemical components and structure, stable performance, mulite main crystal phase, small linear change, high high-temperature strength and certain flexibility due to mutual insertion of micro crystals and the like, the shortcomings of low middle-temperature strength and poor wear resistance and alkali corrosion resistance of the conventional high-aluminum bauxite castable are overcome, and the problems of low middle-temperature strength, poor wear resistance and poor alkali, chloride and sulphur corrosion resistance of the conventional high-aluminum and corundum castable are effectively solved. The wear and corrosion resistant castable with high middle-temperature performance is prepared. The wear corrosion resistant castable and the preparation method thereof have the advantages of small fluctuation of water adding amount in construction, stable usability, reduction rate of partial corrosion, prolonged service life and wide application to a kiln hood, a grate cooler, a tertiary air duct and a decomposing furnace of a dry process cement kiln and relative parts of other ceramic and petrified thermo-technical kilns and the like.
Owner:YANGQUAN JINYU TONGDA HIGH TEMPERATURE MATERIALS +1

Fire-resistant and earthquake-resistant steel for construction and production method thereof

ActiveCN102952994AImprove fire resistanceSimple mechanical propertiesReduction rateEarthquake resistance
The invention relates to a fire-resistant and earthquake-resistant steel for construction. The steel comprises the following components by weight percent: 0.1-0.18 % of C, 0.1-0.50 % of Si, 1-1.80 % of Mn, less than or equal to 0.025 % of P, less than or equal to 0.015 % of S, less than or equal to 0.50 % of Cr, less than or equal to 0.30 % of Mo, less than or equal to 0.04 % of Al, less than or equal to 0.007 % of N, less than or equal to 0.006 % of Ca, one or two or more of less than or equal to 0.050 % of Nb, less than or equal to 0.055 % of V and less than or equal to 0.035 % of Ti, with Nb+V+Ti being <= 0.055 %, and the balance being Fe and unavoidable impurities. A production method comprises heating under a temperature of 1180 DEG C, insulating for 3 hours, rolling with a starting temperature of not less than 1180 DEG C, an accumulated reduction rate of last three controlled rolling being not less than 35 %, and a terminating temperature of 860 to 900 DEG C, and then directly air-cooling to a room temperature or cooling with a rate of 5 to 15 DEG C per second to the room temperature. The obtained steel is excellent in fire resistance, low in yield ratio (Rp0.2/Rm <= 0.75), and good in earthquake-resistance performance, with Rp0.2 (yield strength at 600 DEG C) / Rp0.2 (yield strength at the room temperature) >= 2/3.
Owner:BAOSHAN IRON & STEEL CO LTD +1

High crack-arresting toughness steel plate with yield strength of 500MPa and production method thereof

The invention provides a high crack-arresting toughness steel plate with yield strength of 500MPa and a production method thereof. The chemical components of steel comprises the following components in percentage by weight: 0.04-0.08% of C, 0.10-0.5% of Si, 0.8-1.6% of Mn, not more than 0.02% of P, not more than 0.01% of S, 0.03-0.065% of Al, not more than 0.005% of N, 0.005-0.05% of Nb, 0.005-0.03% of Ti, 0.0005-0.003% of B, not more than 0.004% of Ca, and the balance of Fe and avoidless impurities. The preparation method comprises the steps of roughing in an austenite re-crystalline region in a first stage, wherein the rolling temperature is 1000-1130 DEG C, the total reduction rate in the re-crystalline region is greater than or equal to 50%; cooling a rolled steel plate quickly to 580-530 DEG C at a rate of 10 DEG C/s; rolling in a non-re-crystalline region in a second stage when the temperature of the surface of the steel plate is 720-770 DEG C, wherein the accumulated deformation is greater than or equal to 50%, the finish rolling temperature is 700-740 DEG C; and water-cooling after rolling, wherein the cooling rate is 5-15 DEG C/s, and the final cooling temperature is 460-560 DEG C. The high crack-arresting toughness steel plate provided by the invention has the characteristics of high strength, high toughness, inhibition of crack formation and expansion and the like, and meets the performance requirements of special part members of large container ships.
Owner:ANGANG STEEL CO LTD

Phosphates adhesive and preparation method thereof

The present invention discloses a phosphate adhesive and a preparation method thereof, which relate to an adhesive and a preparation method thereof. The present invention resolves the problem that the curing and heat-resisting capabilities of the prior phosphate adhesive are impaired under the room temperature. The phosphate adhesive of the present invention is prepared with phosphoric acid solution, aluminum hydroxide powder, aluminum oxide powder, zirconium oxide powder and zinc oxide powder or aluminum nitride powder. The preparation method includes the following steps: (1) the materials are weighed out; (2) the phosphoric acid solution is mixed with the aluminum hydroxide powder so that aluminum dihydrogen phosphate matrix resin can be made; (3) the aluminum oxide powder, the zirconium oxide powder and the zinc oxide powder or the aluminum nitride powder are mixed together so that curing agent is prepared; (4) the aluminum dihydrogen phosphate matrix resin and the curing agent are mixed together, and after being cured under the room temperature, the phosphate adhesive is prepared. The phosphate adhesive of the present invention can be cured under the room temperature and can resist a temperature up to 1580 DEG C, moreover, the water-resisting property of the phosphate adhesive of the present invention is good, and after the phosphate adhesive is soaked in tap water under the room temperature for 100 days, the reduction rate of the adhering strength of the phosphate adhesive is less than 10 percent.
Owner:INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI

High intensity and high ductility -50 DEG C low-temperature steel and manufacturing method thereof

InactiveCN101381841AHigh strengthStable and excellent low temperature toughnessReduction rateChemical composition
The invention discloses high-strength high-toughness low-temperature steel at 50 DEG C below zero and a manufacturing method thereof, and belongs to the manufacturing field of low alloy steel. The low-temperature steel comprises chemical compositions in percentage by weight: 0.12 to 0.20 percent of C, 0.15 to 0.50 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.30 to 1.00 percent of Ni, 0.005 to 0.050 percent of Ti, 0.005 to 0.10 percent of Al, 0.010 to 0.050 percent of Nb, one or more than one of less than or equal to 0.10 percent of V, less than or equal to 1.0 percent of Cu, less than or equal to 0.50 percent of Mo, less than or equal to 0.040 percent of Zr, and less than or equal to 0.20 percent of RE, and the balance being Fe. The manufacturing method for the steel comprises the following steps: the heating temperature of steel billets is between 1, 150 and 1, 280 DEG C, the heating rate is between 8 and 14 minute/centimeter, the initial rolling temperature of the steel is more than or equal to 1, 100 DEG C, the accumulated reduction rate of control rolling is more than or equal to 60 percent, the reduction rate of each of final three passes is more than or equal to 10 percent, and the final rolling temperature is between 780 and 860 DEG C; and the normalizing heat treatment is adopted, the keeping temperature of the normalization is between 850 and 930 DEG C, and the keeping time is 30-50 minutes+plate thickness (millimeters) x 1 minute/millimeter.
Owner:武汉钢铁有限公司

Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof

The invention relates to a sustained-release polycarboxylic high-performance water reducing agent and a preparation method thereof. The water reducing agent comprises: 0.13mol of monomer methyl alkenyl polyoxyethelene or allyl polyoxyethylene ether or polyoxypropylene ether, 0.32mol of monomer acrylic acid or methacrylic acid, 0.01mol of monomer sodium methallyl sulfonate, 0.12mol of monomer acrylamide or 2-acrylamide-methylpropanesulfonic acid, and 0.05mol of monomer ethyl acetate or styrene. Deionized water is adopted as a reaction medium, and the materials are subjected to a reaction with an initiating agent and a chain transfer agent for 4-6h with a maintained temperature of 58-62 DEG C. Copolymerization is carried out, such that a polymer with a molecular weight of 50000-120000 is obtained; the temperature is reduced to below 40 DEG C, and an alkali solution is added for regulating the pH of the system to 6-8, such that the water reducing agent is obtained. The sustained-release polycarboxylic high-performance water reducing agent provided by the invention has high water reduction rate. When an equivalent solid dosage is 0.2%, a water reduction rate can reach 35%. A slump performance is good. Concrete slump and extension degree have no loss in 3h. The water reducing agent is widely adaptable with concrete raw materials.
Owner:广西云鹰新材料科技有限公司

Austenitic stainless steel with excellent polishing performance and manufacturing method thereof

The invention discloses an austenitic stainless steel with excellent polishing performance. The austenitic stainless steel comprises the following chemical components in percentage by weight: 16 to 20 percent of Cr, 7 to 15 percent of Ni, less than or equal to 2 percent of Mn, 0.2 to 2 percent of Cu, less than or equal to 0.05 percent of Al, less than or equal to 0.5 percent of Si, 0.03 to 0.1 percent of C, less than or equal to 0.05 percent of N, 0.01 to 0.06 percent of P, 0.003 to 0.05 percent of S, 0.05 to 0.5 percent of V, and the balance of iron and inevitable impurities. A manufacturing method for an austenitic stainless steel cold-rolled plate comprises the following steps of: heating a continuous cast plate blank to the temperature of between 1,100 and 1,300 DEG C; performing rough rolling at the temperature of between 1,000 and 1,250 DEG C; performing final rolling at the temperature of between 950 and 1,100 DEG C; performing quick cooling; coiling at the temperature of less than 700 DEG C; performing hot rolling to form a hot-rolled plate of the required specification; annealing the hot-rolled plate at the temperature of between 950 and 1,200 DEG C; removing oxide skin by adopting a continuous acid washing process of phosphorus breakage, shot blasting, electrolysis and mixed acid washing; performing cold rolling, wherein the overall reduction rate is more than 50 percent; and performing continuous annealing at the temperature of between 950 and 1,200 DEG C, or performing full-hydrogen bright annealing at the temperature of between 950 and 1,200 DEG C. The austenitic stainless steel cold-rolled plate has completely improved grinding performance and surface polishing performance, and is particularly suitable for the industries of building decoration, plastic dies, food sanitation, electronics and the like with strict polishing performance requirements.
Owner:BAOSHAN IRON & STEEL CO LTD

Device and method for top gas enrichment utilization of blast furnace

The invention relates to a device and method for top gas enrichment utilization of a blast furnace, in particular to a device and method for using top gas in a blast furnace production process, belonging to the field of smelting pig iron with the blast furnace. The device is characterized in that: a tee joint is arranged on a pipeline between a gas purifying and de-dusting system and an excess pressure power generation device; a gas pressurization device, a gasification furnace and a gas back-eject hole which is formed on the blast furnace are connected through the pipeline and a valve to form one way of the tee joint; the gasification furnace is provided with an oxygen supply pipeline and a coal blending device; the enriched gas, after being pressurized, enters the gasification furnace and is subjected to gasification reaction with oxygen and powder coal in the pressurized gasification furnace; a reaction product is ejected into the blast furnace for smelting iron through the back-eject hole which is formed on the blast furnace; the excess pressure power generation device is respectively connected with a hot blast heater, a power plant boiler pipeline and a valve through a gas distributor to form another way of the tee joint; and the generated hot air is fed into the blast furnace through a nozzle. The device has the advantages of novel conception, simple process flow, easiness in implementation, safety and reliability in operation and capabilities of increasing the calorific value of gas, ejecting back to smelt iron, increasing the indirect reduction rate, reducing the coal ratio, reducing blast furnace slag and CO2 emission, regulating and controlling the width of a cohesive zone of the blast furnace, ensuring long-term smooth running of the blast furnace, avoiding diffusion of the top gas, saving energy and contributing to environment friendliness.
Owner:MAANSHAN IRON & STEEL CO LTD

Niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel and rolling method thereof

The invention discloses a niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel, which is characterized by comprising the following chemical compositions in percentage by weight: 0.07 to 0.12 percent of C, 0.30 to 0.55 percent of Si, 1.30 to 1.55 percent of Mn, 0.020 to 0.045 percent of P, 0.001 to 0.010 percent of S, 0.25 to 0.35 percent of Cu, 0.20 to 0.30 percent of Cr, 0.15 to 0.30 percent of Ni, 0.04 to 0.08 percent of V, 0.02 to 0.05 percent of Nb, 0.006 to 0.030 percent of Als and the balance of Fe and residual trace impurities. The invention also discloses a rolling method for the H-shaped steel, wherein the soaking temperature of a casting blank is 1,195 to 1,225 DEG C; the start rolling temperature of a breaking down mill is 1,100 to 1,150 DEG C; the finish rolling temperature of the breaking down mill is 980 to 1,030 DEG C; the start rolling temperature of a universal roughing mill is 900 to 950 DEG C; the finish rolling temperature of the universal roughing mill is 800 to 870 DEG C; and a control total rolling reduction rate of a universal rolling area is more than or equal to 50 percent. By the method, the hot rolled H-shaped steel with high strength, high toughness, high weather resistance and good welding performance can be prepared. At the same time, because the steel has simple metallurgic components, relatively low alloying production cost, economy and practicability, the hot rolled H-shaped steel is the ideal hot rolled H-shaped steel used for manufacturing railway vehicles, freight semi-trailers and other industrial facilities needing the high-strength and high-weather-resistance steel.
Owner:MAANSHAN IRON & STEEL CO LTD

Method for recycling and processing ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry

The invention discloses a method for recycling and processing ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry, relates to a regenerating method for ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry, and aims to provide an ammonia-nitrogen-containing wastewater recycling method which is low in operation cost, high in ammonia-nitrogen pollutant eliminating rate and high in utilization rate. By adopting a combined mode of an impurity removal workshop section, MVR (melt volume flow rate) and a super-hydrophobic degassing membrane separation technology, heavy-metal-recycled ammonia-nitrogen-containing wastewater of the circuit board etching waste liquor is processed to obtain analytically pure ammonium chloride, and the ammonia-nitrogen content of the processed outlet water is not higher than 8mg/L. By recycling and performing up-to-standard processing on the ammonia-nitrogen-containing wastewater, the method can save the energy resources, can safely and effectively process high-concentration ammonia-nitrogen-containing hazardous wastes and can obtain a high-quality ammonium salt product. The method has the remarkable characteristics of recycling resources, being low in energy consumption, simple to operate, low in operation cost, convenient to manage, free of secondary pollution, high in ammonia-nitrogen pollutant reduction rate, high in utilization rate and the like.
Owner:SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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