200results about How to "Control oxygen content" patented technology

The present invention is self-spreading fusion casting-electroslag remelting process for preparing CuCr alloy as contact material, and belongs to the field of alloy material preparing technology. Consumable electrode rod of CuCr alloy is first obtained with the materials including CuO, Cr2O3 and Al powder as well as proper amount of CaF2 and other additive and through a self-spreading fusion casting process, and then re-smelted in an electroslag furnace to further eliminate impurities, with the melt being water cooled to solidify and to obtain the CuCr alloy ingot. The process of the present invention has low cost, low power consumption and simple operation, and can obtain CuCr alloy ingot with high purity, homogeneous components, high density and no macrosegregation.

The invention discloses a production method of a high-strength, high-conductivity and heat-resistant copper alloy, and belongs to the technical field of copper alloy machining. Accoding to the production method of high-strength, high-conductivity and heat-resistant copper alloy, the inner liner of a crystallizer adopted in the upper-induced continuous casting process is a carbon-carbon composite material so as to ensure the lubrication, high heat conduction and high temperature resistance properties; the temperature of the upper-induced continuous casting is 1180-1230 DEG C, the casting temperature is low so that the problem that molten liquid in the crystallizer is difficult to solidify and the crystallizer inner liner is worn during casting can be effectively avoided; the pressure of protective gas nitrogen in the liquid surface of an upper-induced furnace is controlled to be 0.2-0.7 atmosphere, so that the phenomenon of solid-liquid interface separation in the crystallizer is avoided, and a copper-chromium alloy product with larger weight and length is produced; according to the production method of the high-strength, high-conductivity and heat-resistant copper alloy, the cheapelement (Mg) is used for replacing the rare noble metal, and the mechanical property and the softening resistance property of the copper-chromium alloy are improved; and the production method is a non-vacuum and short-process preparation technology, the cost is low, and the production method is suitable for large-scale industrial production and has important economic and social significances.

The invention relates to pre-melted slag for refining ultra-low aluminum steel and a preparation method and a using method thereof. The preparation method comprises the steps of firstly burdening BaO, CaO, MgO, B2O3, CaC2 and SiO2 according to a proportion, pre-melting at the temperature of 1450-1500 DEG C, cooling, then breaking into blocky materials, and packaging in a moisture-proof mode. The pre-melted slag is used for secondary refining and slagging by a ladle furnace, after pre-deoxidization of molten steel, slag pulling of a ladle and reduction treatment of residual slag, the ladle is added when the ladle is allocated and transported to a refining bay, and the pre-melted slag can be put into the ladle in the LF (ladle furnace) refining or the ladle argon blowing process. Compared with alkaline refined slag adopted in the prior art, the pre-melted slag has the advantages of absorbing Al2O3 in the steel to the greatest extent and promoting the reaction of O and Al in the steel so as to control the Al content below 0.004%; in addition, the pre-melted slag provided by the invention has the advantages of wide raw material sources, simple method and significant economic benefits and social benefits, and is favorable for reducing the cost and protecting the environment.

The invention relates to a process for carrying out strengthening circulation, stage grinding and quality improvement on lignite by utilizing superheated steam and a system thereof. The method comprises the following steps: (1) carrying out grinding on the raw material lignite; (2) burning one part of coal blocks / powder to produce high-temperature flue gas serving as a heat source and carrying out air separation and dring on the other part of coal blocks / powder requiring to be subjected to quality improvement; (3) in the process of air separation, adopting the high-temperature flue gas from the step (2), carrying out drying, separation and dust removal on the qualified coal blocks / powder conforming to the standard grain diameter after air separation, collecting the qualified coal blocks / powder, sending the qualified coal blocks / powder to the forming process, making the unqualified coal blocks / powder drop in a grinding ventilating device to carry out grinding and drying, then continuously completing deep drying by air separation and repeating the steps, wherein the oxygen content in the flue gas is less than 8 percent; and (4) sending one path of waste gas subjected to air separation and drying to the washing process and returning the other path of waste gas serving as a return tail gas part to the step (2) so as to prepare the high-temperature flue gas and carry out air separation. The process has the advantages of safety, energy saving, environment protection, high efficiency, stability and the like.

The invention discloses non-quenched and tempered steel used for welding and electroplating a hydraulic rod and a production method thereof. The non-quenched and tempered steel consists of the following elements according to mass percentages: 0.28-0.35% of C, 0.30-0.80% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, 0.06-0.20% of V, 0.015-0.10% of Ti, less than or equal to 0.020% of P, 0.010-0.035% of S, 0.020-0.060% of Alt, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Ni, less than or equal to 0.10% of Mo, less than or equal to 15*10-4% of O and the balance of Fe and unavoidable impurities. The strength and plasticity index of the non-quenched and tempered steel reaches the level of 45 quenched and tempered steel, and the non-quenched and tempered steel is excellent in machinability and good in welding technological properties. The production method of the non-quenched and tempered steel solves the technical problems of low castability of molten steel caused by adding S and the like, and improves the purity of the steel. The non-quenched and tempered steel provided by the invention can be used for replacing the 45 quenched and tempered steel for manufacturing the hydraulic rod without thermal refining, thus belonging to energy-saving and environmentally-friendly steel.

The invention discloses a smoke pyrolysis kiln-furnace-combined type sludge incinerator. The smoke pyrolysis kiln-furnace-combined type sludge incinerator comprises a rotary pyrolysis device, an incineration furnace, a waste heat boiler, an air preheater and a smoke distribution device and integrates the advantages of a rotary kiln, a pyrolysis gasifier and a reciprocating grate furnace; a rotary pyrolysis gasifier is provided with the smoke distribution device and mixes and distributes smoke in a flow temperature and oxygen content adjustable mode to achieve stable pyrolysis gasification and anoxic combustion of in-furnace sludge, combustible gas generated during the pyrolysis process can enter two combustion chambers of the incineration furnace under the action of system negative pressure for high-temperature incineration; unburnt solid sludge during the anoxic combustion can directly drop on the reciprocating grate of the incineration furnace for continuous incineration. According to the smoke pyrolysis kiln-furnace-combined type sludge incinerator, sludge is pyrolyzed through waste heat inside system smoke, so that energy consumption can be reduced; meanwhile, the content of oxygen entering the rotary kiln is strictly controlled, detonation can be effectively avoided; the waste heat boiler can generate steam for heat supply and power generation.

The invention relates to a multilayer rotary kiln based small granular material destructive distillation method. The method comprises the following steps: adding oil shale granules (with the granularity of 0-20mm) with the water content of below 5% to a bunker from a kiln head, sending to the inner cylinder of a rotary kiln by a spiral conveying device, heating the material in the inner cylinder to 500DEG C through the circulation of high temperature hot flue gas (with the temperature of 700DEG C) from a hot blast stove in an annular channel between an outer cylinder and the inner cylinder to pyrolyze the oil shale material in order to generate a destructive distillation gas and semicoke, and carrying out purifying recovery on the destructive distillation gas to obtain gas and shale oil; and adding the semicoke into the annular channel from the inner cylinder, allowing the semicoke to run along a direction opposite to the material running direction in order to carry out heat exchange of the material in the inner cylinder and absorb the waste heat of the semicoke, discharging parts of the semicoke from the stove, and adding a small amount of the semicoke to the inner cylinder for the mixing of the small amount of the semicoke with a normal temperature mixture in order to further utilize the waste heat of the semicoke. The method has the advantages of simple technology, low energy consumption, no pollution, high product quality, realization of the industrial large-scale production, and easy large-area popularization.

A method for producing neodymium-iron-boron rare earth permanent magnetic materials comprises: controlling technological parameters of alloy smelting, coarsely pulverization, milling by jet mill, and compaction; and adding nano-sized micro powder of oxide, in such a manner that a particle size of milling by the jet mill is decreased, and fine powder collected by the powder filter and powder collected by a cyclone collector are mixed. Utilization rate of the materials and performance of magnets are significantly improved. Usage amount of rare earth is significantly saved, especially usage amount of heavy rare earth. Thus, the scarce resources are protected.

The invention provides a powder metallurgical method for IN718 alloy. The powder metallurgical method for the IN718 alloy comprises the following steps: firstly, preparing spherical powder of the IN718 alloy by adopting a plasma rotating electrode process; secondly, putting the spherical powder into a stainless sheath, carrying out vacuum degassing for 4-8 hours at the temperature of 400-800 DEG C, and soldering and sealing the opening of the sheath; and thirdly, carrying out hot isostatic pressure treatment on the sheath after being soldered and sealed, namely firstly carrying out heat and pressure preservation for 2-4 hours at the temperature of 1210-1270 DEG C and the pressure more than 120 MPa, lowering the temperature to be 1100-1160 DEG C while the pressure condition is not changed, continuously carrying out heat and pressure preservation for 2-4 hours, and finally cooling to room temperature at a cooling rate more than 50 DEG per minute. The powder metallurgical method for the IN718 alloy is simple in technology, only hot isostatic pressure temperature is changed, an extra working process does not need to be added, adverse effect of carbon and oxides on particle surfaces can be effectively eliminated without increasing cost, and mechanical properties of the alloy are obviously improved.

The invention discloses a new slag system for synchronously controlling the hydrogen-oxygen content of an electroslag ingot and a preparation method thereof, belonging to the technical field of an electroslag remelting slag system. The slag system comprises the following components in percentage by weight: 43-47% of CaF2, 18-22% of CaO, 4-6% of Al2O3, 8-12% of MgO, 14-16% of Ce2O3 and 4-6% of La2O3. The preparation method comprises the steps of proportionally preparing slag charge according to the components of the slag system and the weight percentage requirements, wherein the slag charge comprises limestone, dolomite, fluorite, bauxite, cerium oxide powder and lanthanum oxide powder; pre-melting the mixed slag charge at 1,600 DEG C, wherein the pre-melting process is performed by use of an Fe-Al electrode in an electroslag melting device; pouring the liquid-state slag charge into a steel mould; after the product is cooled, breaking and packaging. By adopting the new slag system and preparation method disclosed by the invention, the oxygen content increase of the electroslag ingot in the electroslag remelting process can be controlled to be less than 0.0008%, and the hydrogen content increase can be controlled to be less than 0.0003%, thereby achieving an aim of synchronously controlling the hydrogen content and oxygen content in the electroslag ingot.

The invention discloses cemented carbide for a composite matrix and a preparation method of the cemented carbide. According to a formula, a WC (wolfram carbide) powder mixture is a mixture of conventional WC powder and cast WC powder whose mass ratio is (33-40) : (60-67); the mass ratio of cobalt powder and the WC powder mixture is (8-17) : (83-92); the preparation process comprises steps as follows: material preparation, wet grinding, dry granulation, press forming and low-pressure vacuum integrated sintering. The average WC grain size of the cemented carbide prepared with the preparation method according to the formula is 2.0-3.2 microns, the bending strength is 3,200-3,400 MPa, and the hardness is HRA 85.0-90.8.

A low-oxygen content exhaust flow produced by an engine that is combusting, on average, a stoichiometric mixture of air and fuel generally contains various unwanted gaseous emissions. The exhaust flow is treated by an exhaust aftertreatment system that includes a three-way-catalyst (TWC) and an ammonia-selective catalytic reduction (ammonia-SCR) catalyst positioned downstream from the TWC in a flow direction of the exhaust flow. The ammonia-SCR catalyst includes (1) a base metal ion-substituted zeolite and / or a base metal ion-substituted silicoaluminophosphate and (2) an oxygen storage material selected from the group consisting of a metal oxide or a mixed metal oxide that exhibits oxygen storage and release capacity. The serial arrangement of the TWC and the ammonia-SCR catalyst enhances the conversion of NOX to N2 in the low oxygen-content exhaust flow produced by the engine and helps prevent ammonia slip to the atmosphere.

The invention provides a liquid-state lead bismuth alloy corrosion resisting coating layer and a preparation method thereof and relates to the technical field of material surface treatment. The liquid-state lead bismuth alloy corrosion resisting coating layer comprises a matrix, a coating layer body and a thermally-growing oxide layer, wherein the coating layer body is attached to the surface of the matrix, the thermally-growing oxide layer is attached to the surface of the coating layer body, and the coating layer body is prepared from a material of FeCrAlY. The preparation method of the liquid-state lead bismuth alloy corrosion resisting coating layer comprises the steps: preparing the coating layer body on the surface of the pretreated matrix and then directly performing pre-oxidation treatment on the coating layer body. The FeCrAlY coating layer body of the liquid-state lead bismuth alloy corrosion resisting coating layer disclosed by the invention has good combination with the matrix; the liquid-state lead bismuth alloy corrosion resisting coating layer has the advantages of compact structure, even and controllable thickness, low oxygen content and low surface roughness; pre-oxidation is directly performed on the surface of the coating layer body to in situ generate an even, continuous and compact thermally-growing oxide layer, the thermally-growing oxide layer can directly contact a lead bismuth cooling agent for a long time, and liquid-state lead bismuth alloy corrosion resistance of the coating layer body is improved; a preparation process has the advantages of lowcost, high, efficiency, greenness, environmental friendliness and the like.

The present invention provides an oxide semiconductor capable of achieving a thin film transistor having stable transistor characteristics, a thin film transistor having a channel layer formed of the oxide semiconductor and a production method thereof, and a display device equipped with the thin film transistor. The oxide semiconductor of the present invention is an oxide semiconductor for a thin film transistor. The oxide semiconductor includes indium, gallium, zinc, and oxygen as constituent atoms, and the oxygen content of the oxide semiconductor is 87% to 95% of the stoichiometric condition set as 100%, in terms of atomic units.

The invention discloses a production process of a non-vacuum downwards-drawing continuous casting copper-iron alloy slab ingot. The production process mainly comprises the following steps of burdening, charging, smelting, refining degassing, pouring, casting and ingot casting, wherein the copper-iron alloy slab ingot is successfully prepared by using an electrolytic copper plate and a CuFe50 master alloy as smelting raw materials through a non-vacuum downwards-drawing continuous casting process, and compared with a traditional vacuum casting process, the equipment requirement is low; inert gasprotection is adopted in the casting process, appropriate measures such as iron content are adjusted, and the alloy composition and the oxygen content are effectively controlled; the process has theadvantages of being stable in process, simple and convenient to operate, low in casting production cost and capable of realizing industrial production of the copper-iron alloy slab ingot.

The invention relates to the technical field of the sound metal material manufacture and in particular to extra-low oxygen rare earth alloy and use. The rare earth metal content is 5%-95%, and the oxygen content O is less than or equal to 0.010% (weight percentage). The rare earth metal in the rare earth alloy is the single metal of lanthanum, cerium, praseodymium and neodymium or an arbitrarily-proportional mixture of more than two metals. The rare earth alloy is a metal mixture of the rare earth metal with one or more of iron, silicon, magnesium and aluminum. The extra-low oxygen rare earth alloy is capable of providing an additive to sound metal materials of equipment manufacture, such as steel, aluminum, magnesium alloy, and magnet, stably improving the performance of the metal material for equipment manufacture, and avoiding the negative effects of the rare earth additive generated in the materials, such as large occluded foreign substance and deterioration performance.

An environment-friendly high temperature low oxygen hot blast furnace belongs to the technical field of hot blast furnaces in the metallurgy industry. The invention comprises a hot blast furnace, shut-off valves, regulating valves, a gas flue for the hot blast furnace, a combustion air pipeline for the hot blast furnace, a gas flue for a combustion furnace, a combustion air fan for the combustion furnace, a combustion air pipeline for the combustion furnace, the combustion furnace, a high temperature flue for the combustion furnace, a gas mixing furnace, a gas mixing pipeline, a low temperature flue, a flue gas pressing machine, flues for the hot blast furnace, a low temperature preheating system, a gas main from a pipe network, a combustion air main and a combustion air fan for the hot blast furnace. The hot blast furnace has the following advantages: the hot blast furnace is suitable for different metallurgical technological processes, can be used in combination with various combustion air and gas low temperature preheating devices, fully recover the flue gas waste heat and further improve the heat efficiency, and realizes high blast temperature, high efficiency, environment friendliness and long life.

The invention relates to a steel for a high-strength mining machine, which comprises the following components in percentage by weight: 0.32-0.39% of C, 1.10-1.40% of Si, 0.80-1.10% of Mn, 0.005-0.020% of P, 0.001-0.025% of S, 1.10-1.40% of Cr, 0.01-0.20% of Cu, 0.01-0.30% of Ni, 0.010-0.060% of Al, 5-20*10<-6> of O, and the balance of Fe and inevitable impurities. The invention also provides a preparation method of the steel for a high-strength mining machine. The steel provided by the invention has excellent comprehensive properties; and the cutting picks of the manufactured heading machine satisfy the operational requirements for large-size mining machines, and enhance the coal production efficiency and economic benefit.

The invention belongs to the technical field of target manufacturing, and particularly relates to a chromium-aluminum alloy target and a manufacturing method of the chromium-aluminum alloy target. Chromium and aluminum are adopted as main elements of the chromium-aluminum alloy target. The target further comprises at least two elements of Co, Ti, Ta, W, Nb, Mo, Zr, V, B, Si, Y, La, Ce and Se. Nitrided, carbonized and nitrided-carbonized composite membrane layer materials of multiple forms can be formed by adding a variety of elements. A product can be further compacted better based on the improved technology for heating treatment. The oxygen content is effectively controlled based on the improved powder mixing and degassing technology.

The invention discloses a deoxidation method of plain carbon steel. The deoxidation method comprises the following steps: sequentially adding a carburant and a ferrosilicon for deoxidation; in the case of high oxygen activity at the converter destination, adding ferroaluminium and ferrosilicon for pre-deoxidation before adding the carburant, wherein the weight ratio of the ferroaluminium to the ferrosilicon is 1: (3-4); and supplementing aluminum wires according to the oxygen activity of a small platform after the converter steel tapping operation is finished, so as to ensure that the oxygen content of molten steel is reduced to be below 20 ppm. According to the deoxidation method disclosed by the invention, the finally obtained molten steel can meet the requirements of continuous casting process, the production cost is reduced and safe production is realized at the same time.

The invention discloses a preparation method of a silicon-aluminum sputtering target material high in density, low in oxygen content and not prone to embrittlement. The preparation method comprises the following steps of target material base tube preparing, wherein a stainless steel base tube of the required type is selected and checked; base tube surface pretreatment, wherein the base tube is made to enter base tube pretreatment equipment to be subjected to sand-blasting roughening, a nickel-aluminum alloy wire is utilized, a bottoming combination layer is sprayed through an arc spray method, and a target material base tube to be sprayed is obtained; raw material preparing, wherein 50 kg of silicon powder with the content ranging from 99.9% to 99.95%, the oxygen content being smaller than or equal to 1,000 ppm and the particle size ranging from 45 micrometers to 150 micrometers and 6.6 kg of high-purity spherical aluminum powder with the content ranging from 99.9% to 99.95%, the oxygen content being smaller than or equal to 1,500 ppm and the particle size ranging from 45 micrometers to 100 micrometers are weighed; powder mixing, wherein two obtained raw materials are put into a V-shaped powder mixer to be mixed for 5 hours to 6 hours; and drying, wherein an evenly-mixed silicon-aluminum powder raw material is put in a drying furnace to be dried for 2 hours to 3 hours, and the temperature is 60 DEG C.

The invention provides compound nutrient powder suitable for tumor treatment. The main components include broccoli seed extract, yeast beta-glucan, nutrient-enriched yeast, acerola cherry powder and inulin, and the auxiliary components are selected from one of, or a plurality of, or all of the following components: whey protein powder, collagen powder, soybean protein powder, broccoli powder, asparagus powder, corn flour, yam flour, agaricus blazei powder, crystalline fructose, maltitol, stevioside and acesulfame potassium. The beneficial effects of the compound nutrient powder are as follows: a formula which combines the broccoli seed extract, the yeast beta-glucan, the nutrient-enriched yeast, the acerola cherry powder and the inulin can effectively realize the function of each component and is helpful for each component to work together so as to increase immunity and help to treat the tumors. The invention also provides a preparation method based on the compound nutrient powder suitable for tumor treatment.

The invention discloses a preparation method of a low-cost titanium alloy, comprising the following steps of: 1, evenly mixing titanium powder with MoFe intermediate alloy power in proportion on the basis of the nominal composition of Ti-1.5Fe-2.5Mo alloy, so that mixed powder can be obtained; 2, forming the mixed powder in a compression way by isostatic cool pressing, so that a powder pressed shape can be obtained; and 3, sintering the powder pressed shape under the vacuum condition with the temperature from 1250DEG C to 1350DEG C, so that the Ti-1.5Fe-2.5Mo alloy can be obtained. The preparation method takes pure titanium powder with coarser granularity as a raw material, so that the oxygen content in the titanium powder can be greatly reduced, therefore, the oxygen content in the alloy can be controlled, the plasticity and the fatigue property of a Ti-1.5Fe-2.5Mo alloy part can be further improved, the relative density of the prepared alloy is more than 97%, the tensile strength of the prepared alloy is more than 850MPa, the elongation of the prepared alloy is not less than 15%, and the cross-section shrinking percentage of the prepared alloy is not less than 20%.

The invention relates to a preparation method of hyperpure nitride powder. The preparation method comprises the following steps of fully mixing metal powder, a diluent and an additive in a pot mill to obtain an original mixture, screening the original mixture to obtain a reaction material, uniformly putting the reaction material into a graphite boat, closing a reactor with the graphite boat, carrying out vacuum-pumping, filling high-purity nitrogen into the reactor, and supplying power to nichrome wires to ignite a primer in the reactor, wherein the reaction material is ignited by heat produced by the primer and then produces the hyperpure nitride powder. In the reactor having high nitrogen pressure, through radiation ignition, a part of the reaction material is ignited, and through heat produced by a self-maintenance exothermic reaction of the powder and nitrogen, the reaction material fully reacts. The preparation method does not need an external heat source and has short reaction time. The hyperpure nitride powder obtained by the preparation method has high content and stable quality.

The invention relates to a method for preparing a continuous extrusion high-tech energy-saving copper bus. In materials, the content of copper and sliver is more than or equal to 99.94, and the content of oxygen is less than or equal to 0.0015. The preparation method comprises the following steps: firstly, melting, namely, placing No. 1 electrolytic copper or cathode copper into a melting furnace, raising the temperature of the furnace, keeping the temperature of copper liquid between 1,130 and 1,170 DEG C, and covering a charcoal layer on the surface of the copper liquid; secondly, updraft continuous casting, namely, directly extending a hollow crystallizer into the copper liquid, cooling the hollow crystallizer by adopting a water jacket, condensing the copper liquid into solid in the hollow crystallizer, and drafting the upper end of the solid by a drafting mechanism to manufacture a copper rod; thirdly, continuous extrusion, namely, placing the copper rod obtained in step two into an extruder, and continuously extruding the copper rod into a blank; and fourthly, cold drawing and forming, namely, placing the blank obtained in step three into a drawing machine to carry out cold drawing and forming to prepare the continuous extrusion copper bus. The content of the oxygen of the continuous extrusion copper bus is low.

The invention belongs to the technical field of utilization of biomass, and discloses a front biomass ultra-high-speed self-balancing gasifying co-combustion device and method for a coal-fired boiler. Biomass ultra-high-speed self-balancing gasifying equipment is used for gasifying biomass, and after being cooled and pressurized, fuel gas is delivered into a hearth of the coal-fired boiler and then is combusted. A fuel gas cooling medium is steam which is extracted from a medium-pressure section in a turbine and the temperature of the steam is 400 DEG C, after heat is exchanged between the steam and the fuel gas, secondary heat exchange between the steam and air is implemented, and high-temperature air is produced and supplied for a gasifier. A biomass gasifying coupling large coal-fired power generation system is realized, biomass power generation parameters and efficiency are improved by a high-capacity and high-parameter turbine power generation system, the problem that an existing biomass direct-fired technology is small in power generation scale and low in efficiency is solved, the front biomass ultra-high-speed self-balancing gasifying co-combustion device and method for the coal-fired boiler are suitable for high-alkalinity and high-moisture biomass, and the utilization range of biomass is expanded.

The invention relates to a production technology of steel used for a pipe line steel electrode, which sequentially comprises converter steel making technology, argon station refining technology and continuous casting technology; specific technological parameters of the converter steel making technology are as follows: (1) in molten iron in a converter, the weight percentage content of S is less that or equal to 0.003 percent; (2) converter finishing point control is as follow: steel tapping temperature is 1680 to 1690 DEG C, and in tapped molten steel, the weight percentage content of C is 0.04 to 0.06 percent; (3) converter finishing point slag-thickening operation is as follows: magnesium balls and lime dry slag are added at the converter finishing point to lead final slag in the steel tapping course to be thickened; and (4) final deoxidation technology is as follows: when steel tapping reaches 1 / 3, final deoxidizer and refining slag are added, and stirring is conducted with heavy argon; at the interval between 4 / 5 of the steel tapping and finish of the steel tapping, argon blowing is conducted for 25 to 35 seconds; and the refining slag consists of the lime and fluorite, and weight ratio of the lime to the fluorite is 2:0.4 to 0.6. The production technology well controls contents of carbon, silicon and oxygen in the production process, thus improving the steel-making success rate of the steel used for the pipe line steel electrode.

The invention discloses an ultralong high-conductivity cable copper tape and a production technology thereof. The copper tape comprises the following components by weight percentage: 99.935-99.945% of Cu, P greater than 0 and less than or equal to 0.001%, O greater than 0 and less than or equal to 0.001%, Ce greater than 0 and less than or equal to 0.06%, and impurities less than 0.055%. The production technology of the copper tape comprises the steps of casting, heating, hot rolling, face milling, rough rolling, edge trimming, cleaning, finish rolling, finished product annealing, finished product shearing, packing and warehousing. The production technology is short in production cycle; processing is easy; the conductivity of the produced copper tape reaches above 100% IACS (International Annealed Copper Standard); and the length of the finished copper tape can reach above 8000m. The production technology comprehensively adopts four deoxidation techniques (including rare earth element Ce addition), so that the oxygen content of the copper tape is controlled below 10ppm.