35results about How to "Effective deoxygenation" patented technology

The invention relates to a high-strength toughness cold-working die steel and a manufacturing method thereof, belonging to the technical field of alloy steel manufacturing technology. The chemical composition and weight percentage of the alloy steel of the present invention: C 0.9~1.0%, Cr 9~10%, Mo 2.0%, V 0.8~1.0%, Si 1.0%, P<0.02%, S<0.02%, Fe surplus quantity. The preparation process and steps of the cold work die steel of the present invention are as follows: (1) smelting, (2) electroslag remelting, (3) annealing, (4) rough forging, (5) re-annealing, (6) spheroidizing annealing , (7) Quenching and tempering. The hardness of the alloy steel prepared by the method of the invention can reach 61-63HRC, and the impact energy AK can reach 61-85J, which is more than three times higher than that of the original Cr12MoV steel.

Disclosed is a copper alloy powder having excellent oxidizability and electrical conductivity, whose sintering starting temperature can be set discretionally. This copper alloy powder enables low production cost, that is composed of the costs for raw materials and production facilities. Specifically disclosed is a copper alloy powder composed of 0.05-3.00% by mass of aluminum, and the balance of copper and unavoidable impurities, while additionally containing 0.01-0.10% by mass of boron, if necessary. This copper alloy powder is granulated by a water atomization process.

The invention relates to a pollution-free molten slag deoxidization method capable of adjusting anode oxygen partial pressure and a device thereof, and belongs to the technical field of metallurgical refining process. In the method, molten steel or molten metal is deoxidized and purified by the special device. In the method, the molten slag is taken as electrolyte, a deaeration cavity electrode inserted into the molten slag is taken as an anode, and the molten steel or the molten metal is taken as a cathode; the deaeration electrode is provided with an electrode cavity and is communicated with a vacuum chamber by a conduit; an applied DC power supply exerts direct current impulse voltage so that an electric field is formed between the molten steel or the molten metal and an oxygen electrode of the molten slag, and the conduction of oxygen ions in a molten slag system and mass transfer of dissolved oxygen in the molten steel are controlled by controlling a current value and a voltage value of the DC power supply as well as components of the molten slag. The oxygen is diffused from the molten slag to the electrode cavity and discharged by an air exhaust system by controlling the oxygen partial pressure of the electrode cavity.

The invention discloses magnesium-containing steel 45 and a preparation process thereof, and relates to the technical field of steel production. The steel 45 comprises the following chemical components of, in percentage by mass, 0.45%-0.48% of C, 0.17%-0.37% of Si, 0.65%-0.80% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.0005%-0.0020% of Mg, and the balance iron and inevitable impurities. On the basis of ensuring the safe production of the steel 45, the inclusion in the steel is modified by feeding a magnesium-silicon cored wire into molten steel at the final stage of refining, so that the inclusion in the steel is converted into the fine and dispersively distributed sulfide-oxide composite inclusion, the rating of the inclusion is optimized, and the comprehensive mechanical property of the steel 45 is improved.

The invention relates to a preparation method of a fluorine-free low-titanium molten steel purifying agent (refined material), and belongs to the technical field of deep processing of non-metallic materials. The preparation method is as follows: melting at least one of natural wollastonite, quartz and calcium carbonate as a raw material to obtain a fluorine-free low-titanium molten steel purifier (refined material). The fluorine-free low-titanium molten steel purifier (refined material) prepared by the present invention can be directly used for impurity removal, refining and cleaning molten steel during steel smelting; the fluorine-free low-titanium molten steel purifier (refined material) forms slag quickly and It absorbs impurities in molten steel, increases the fluidity of molten steel, and at the same time, removes non-metallic inclusions in molten steel, effectively deoxidizes, and promotes desulfurization. It is an ideal molten steel refining material for smelting special steel and pure steel.

The invention discloses a kind of high manganese and low carbon composition alloy and the preparation method of it, the composition alloy contain the percentage by weight component as follow: Mn 70~75, Si 11~17, Al 7~14, P<0.2, C<0.3, S<0.03,surplus is Fe. The invention of composition alloy component proportioning science and rational, specific weight controlling strict, the method can deoxidize efficient for liquid steel, remove the foreign substance in liquid steel and deoxidize rapidly, make the steel slag easily floated upward and removed to obtain high degree of purity liquid steel, the composition alloy can be used as deoxidant in smelting kinds of steel, especially suitable for smelting conduit wiring steel, bridge and canal steel and high-strength ship plate steel that need strength deoxidation capacity, the composition alloy can reach high deoxidation effect.

A DC arc induction furnace for refining molten steel has the top graphite cathode connected to the cathodic copper bus of rectifier chest via the water-cooled cable and the electrically conductive bottom bricks used as bottom anode connected to the anodic copper bus of rectifier chest via the water-cooled cable. Its advantages are high volume and heat capacity, long service life and high quality of molten steel.

The invention relates to high-strength composite solder. Deposited metal formed by the solder comprises, by mass percentage, 0.04%-0.08% of carbon, 0.30%-0.50% of silicon, 4%-8% of manganese, 10%-18%of nickel, 4%-8% of chromium, 2%-4% of titanium, 0.4%-0.8% of molybdenum, 60%-70% of iron and the balance impurities, specifically, the weight ratio of the nickel to the chromium is 2-3:1. The high-strength composite solder has the high strength and the high mechanical stretch performance, is stable in performance under the high temperature condition, low in cost and few in electric arc splash, and easily achieves slag removal.

The invention discloses a high-strength corrosion-resistant copper alloy and a preparation method thereof. The high-strength corrosion-resistant copper alloy comprises 4.0 to 10.0 wt% of Al, 1.0 to 4.0 wt% of Fe, 1.0 to 4.5 wt% of Mn, 0.8 to 3.5 wt% of Ni, 0.08 to 0.5 wt% of Cr, 0.001 to 0.05 wt% of P, less than or equal to 0.15 wt% of inevitable impurities in total, and the balance of Cu. By adjusting the contents of the Fe, Ni, Cr and P elements, optimizing the processing technology and the heat treatment technology, controlling the composition of a matrix, the grain size and the fine dispersed distribution of a strengthening phase, the effects of all alloy elements are fully exerted, the mechanical property, machinability and corrosion resistance of the alloy are remarkably improved, and the performance of the alloy can be comprehensively improved through thermomechanical treatment. The tensile strength of an annealed material is 560 MPa or above, the yield strength is 330 MPa or above, the yield ratio is 0.55 or above, the ductility is 42% or above, the total immersion uniform corrosion rate is 0.01-0.02 mm/a, and the erosion corrosion rate is 0.2 mm/a or below under the seawater condition with the flow speed being 5 m/s. The alloy can meet the requirements of ocean engineering, ships, petrochemical engineering and the like on the comprehensive performance of the aluminum bronze.

The invention relates to a preparation method of a molten steel deoxidizing agent and belongs to the technical field of iron and steel smelting. The preparation method comprises the steps that lanthanum oxide and boron powder are mixed, ball-milled, sieved and then pressed, and a billet is obtained; the billet is cooled to the room temperature after being calcined and then is crushed and ball-milled, and modified powder is obtained; A00 aluminum, metal manganese powder and manganese chloride are melted, and alloy melt is obtained; and the modified powder is added into the alloy melt to be stirred and mixed, the mixture is cooled to the room temperature after heating melting and segmented cooling are conducted, and the mixture is crushed, ball-milled and sieved. According to the preparation method, manganese and aluminum are compounded to prepare an alloy material, and the alloy material conforms to molten steel in density, so that the floating speed is remarkably reduced after the alloy material is thrown into the molten steel; the alloy material too late to dissolve suspends in the molten steel, the upper half portion of the alloy material is oxidized by furnace slag possibly, the lower half portion of the alloy material can still continue suspending in the molten steel for deoxygenation treatment, and the metal recovery rate is effectively increased; and meanwhile generation of intragranular acicular ferrite in steel is effectively promoted while the molten steel material is deoxidized, so that the performance of a steel material is improved.

The invention discloses a smelting process for a supersaturated high-nitrogen stainless steel electrode bar, and belongs to the technical field of high-nitrogen ferrous metallurgy application. The smelting process comprises the steps of manufacturing foam slag by using coke powder in the primary smelting process, and tapping in a steel and slag remaining mode; performing slagging deoxidation, desulfurization and impurity removal treatment to molten steel flowing into a ladle refining furnace to obtain furnace slag, and meanwhile adding multiple intermediate alloys into the ladle refining furnace; determining whether to add a small amount of Al blocks or not according to the situation that the molten steel deoxidation and the furnace slag deoxidation are good or not in the process; puttingthe refined molten steel into a VD vacuum furnace for vacuum treatment, and blowing argon at the vacuum degree of no higher than 67 Pa; replacing argon with nitrogen for soft blowing and stirring themolten steel when the vacuum degree is higher than 98 Pa; controlling the temperature of the obtained supersaturated high-nitrogen molten steel to be 1525-1535 DEG C, pouring the supersaturated high-nitrogen molten steel into an electrode bar grinding tool, and then cooling and conveying the supersaturated high-nitrogen molten steel; and forging and processing the molten steel to obtain the supersaturated high-nitrogen stainless steel electrode bar.

The invention discloses a metal wire feeding device, a charging system and a charging method, and belongs to the technical field of electroslag metallurgy. The metal wire feeding device comprises a feeding channel, a pressing mechanism, a driving mechanism, a driving wheel and a support; the pressing mechanism comprises a guide rod, an elastic piece, a pressing wheel and a sliding sleeve; the guide rod is vertically arranged on the support; the sliding sleeve is arranged outside the guide rod in a sliding mode and connected with the guide rod through the elastic piece, and the pressing wheel is rotationally connected with the sliding sleeve; the driving mechanism is arranged on the support, is connected with the driving wheel and is used for driving the driving wheel to rotate; the driving wheel and the pressing wheel are arranged on the two opposite side portions of the feeding channel respectively, and the rotating plane of the driving wheel and the rotating plane of the pressing wheel and the feeding channel are located in the same plane; and the driving wheel and the pressing wheel can be connected with a metal wire material in the feeding channel in a rolling manner. By means of the metal wire feeding device, stable pressing conveying can be achieved, the conveying amount of metal wire materials can be accurately controlled, the oxygen content of an electroslag remelting system is stably controlled to range from 20 ppm to 30 ppm, and the quality of electroslag ingots is improved.

The invention relates to the technical field of material supply devices and in particular discloses a material spraying device for combusting and feeding biomass bagasse. The material spraying device comprises a shell body, wherein the shell body is internally provided with a feeding hole penetrating through the shell body; a feeding opening and a discharging opening are formed in two ends of the feeding hole respectively; the shell body is further provided with an air inlet hole communicated with the feeding hole; an air inlet is formed in one end, far away from the feeding hole, of the air inlet hole; a communication opening is formed in one end, communicated with the feeding hole, of the air inlet hole; the shell body is provided with an interlayer plate located in the feeding hole; the interlayer plate is used for separating the communication between the feeding opening and the communication opening; the air inlet hole is communicated with the discharging opening through a gap between the interlayer plate and the shell body; when the material spraying device is actually utilized, the biomass bagasse to be combusted is conveyed into the feeding hole through the feeding opening and external air enters the shell body through the air inlet hole; the biomass bagasse in the feeding hole is sprayed into a boiler so that the biomass bagasse is dispersed in the boiler and a condition that the biomass bagasse enters the boiler for combustion in a pile manner is prevented; and the combustion efficiency of the biomass bagasse is improved and the generation of low-nitrogen oxide is reduced.

The invention discloses an accident alloy disposal method and belongs to the field of steel smelting. The accident alloy disposal method comprises the following steps of S1, converter steelmaking; S2, converter tapping, specifically, before alloying operation is conducted, accident alloy and a deoxidizing agent are added for deoxidation, after the tapping amount is complete, at least part of the accident alloy is deoxidized into oxide and exists in steel slag, the oxide comprises manganese dioxide, a manganese source is added according to the lower limit of Mn contained in a steel grade for alloying operation, the accident alloy is added according to the condition that the Mn content in a silicon-manganese alloy contained in the accident alloy is not larger than 0.05% of the mass percent of molten steel, and the deoxidizing agent does not contain the silicon-manganese alloy; and S3, LF furnace refining. Therefore, on the premise that silicon-manganese alloy and silicon-iron alloy in the accident alloy are not sorted, the accident alloy is directly added into the molten steel, so that not only is effective deoxidation achieved, but also Mn is effectively added as an adding component, the accident that the components go out of the standard is not caused, the utilization rate of the accident alloy is effectively increased, and resource waste is prevented.

The present invention relates to a continuous process for the production of a superabsorbent polymer comprising: (a) providing an acidic liquid aqueous monomer mixture containing dissolved oxygen, whereby the monomers are selected to provide after polymerization a superabsorbent polymer, (b) continuously feeding said aqueous monomer mixture to a reactor, (c) introducing a source of carbonate or hydrogen carbonate into said aqueous monomer mixture prior to entry into the reactor thereby forming a gas phase comprising carbon dioxide and at least a part of said dissolved oxygen, said gas phase being dispersed in the liquid phase, (d) subjecting the gas/liquid mixture to at least partial phase separation immediately prior to or after entry into the reactor and at least partially removing the separated gaseous phase, (e); subjecting the liquid phase in the reactor to free-radical polymerization to obtain the superabsorbent polymer, and (f) continuously removing the superabsorbent polymer from the reactor.

The invention relates to the technical field of bagasse providing equipment, and particularly provides a conveying device used for conveying bagasse to a boiler. The conveying device comprises a bottom frame, a supporting base, an impeller, a drive motor, a tripod and a shaft body, the supporting base and the impeller are arranged on the bottom frame, the drive motor and the tripod are arranged on the supporting base, the shaft body is rotatably connected to the supporting base, the tripod is in a right triangle shape, one right-angle side of the tripod is arranged on the supporting base, the other right-angle side of the tripod is arranged on the impeller, the impeller is provided with a feeding hole and a discharging hole communicated with the feeding hole, during use, exterior bagasse to be conveyed is communicated with the feeding hole through a pipeline, the discharging hole of the impeller is communicated with the exterior boiler, the drive motor is started, the impeller extracts the exterior bagasse, the bagasse is jetted to the boiler through the discharging hole under the effect of centrifugal force effect of the impeller, the bagasse is dispersed in the boiler, the stacked bagasse is prevented from entering the boiler for combustion, the bagasse combustion efficiency is improved, and generation of nitric oxide is reduced.