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167results about How to "Improve purity" patented technology

Wheel disc forging and manufacturing method thereof

The invention discloses a wheel disc forging and a manufacturing method thereof and belongs to the technical field of mechanical manufacture. The manufacturing method further optimizes material components, controls the upper limits of C and Mn content, improves Ni content, reduces content of harmful P and S, reduces Si content and temper brittleness of Mn, utilizes an electroslag remelting process so that the purity of molten steel is improved, and utilizes post-forging heat treatment comprising two normalizing processes so that materials are further homogenized and grains are fined. Raw materials adopted by the manufacturing method comprise C, Mn, Si, P, S, Cr, Ni, Al, Cu and Fe. The manufacturing method comprises the following steps of electrode blank smelting, electroslag remelting smelting, steel ingot annealing, steel ingot forging, post-forging heat treatment, property heat treatment, and property and microstructure examination. The wheel disc forging obtained by the manufacturing method and the manufacturing method have the advantages that a ratio of chemical components is reasonable; material purity is high; forging effects on the core are good; density of the metal microstructure is good; and the problems that a wheel disc forging obtained by the existing manufacturing method is unqualified in the forging flaw detection and a mechanical property especially such as a material ductile-brittle transition temperature does not satisfy the requirement are solved.
Owner:TONGYU HEAVY IND

Production method of nickel-based GH4080A alloy wire rod

InactiveCN109985926AImprove purityImprove material performanceWork heating devicesMetal rolling arrangementsControllabilitySmelting
The invention belongs to the technical field of machining and manufacturing of special alloy materials, and particularly relates to a production method of a nickel-based GH4080A alloy wire rod. The production method comprises the following steps of material preparing, vacuum induction smelting, electroslag remelting, heat treatment, forging cogging, billet trimming and grinding, heat treatment, wire rolling, on-line solid solution and finishing. According to the production method of the nickel-based GH4080A alloy wire rod, a vacuum induction melting furnace and electroslag remelting furnace smelting technique is used for obtaining electroslag ingots, the electroslag remelting adopts an appropriate slag system proportion and a smelting argon protection method, which can effectively solve the burning loss problem of easy-to-oxidize elements of Al and Ti in the materials, and remarkably improve the purity of the materials; the Al and Ti retention rate of an induction electrode is increased to more than 96% from about 80% in the past; the material performance is improved; the qualified rate of finished products is high; the cost of raw materials is less; the production process is easyto control; the high-temperature performance is good; the surface forming is good; the yield is high; the grinding weight loss is less; and the controllability is good.
Owner:YONGXING SPECIAL STAINLESS STEEL

Electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power

ActiveCN104789787AImprove purityIncrease melting rateSlagElectricity
The invention discloses an electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power. The method comprises the following steps: (1) selecting a cylindrical metal electrode for electroslag; (2) treating the metal electrode by adopting a machining method; (3) carrying out welding treatment and heating treatment on the metal electrode and a stainless-steel false electrode for the electroslag; (4) carrying out slag melting treatment by selecting a slag system which contains 50%-60% (by weight) of CaF2, 15%-25% (by weight) of Al2O3, 10%-20% (by weight) of CaO, 5%-10% (by weight) of MgO and 3%-6% (by weight) of SiO2; (6) carrying out feeding treatment; (7) carrying out die cooling. According to the austenite nitrogenous stainless steel prepared by the method, the forming of a steel ingot surface is good, and the inclusion content is low and can reach that the inclusion content of a coarse series of a class A is not higher than 0.5, the inclusion content of a fine series of the class A is not higher than 0.5, the inclusion content of a coarse series of a class B is not higher than 0.5, the inclusion content of a fine series of the class B is not higher than 0.5, the inclusion content of a coarse series of a class C is not higher than 0.5, the inclusion content of a fine series of the class C is not higher than 0.5, the inclusion content of a coarse series of a class D is not higher than 0.5, and the inclusion content of a fine series of the class D is not higher than 1.0.
Owner:沈阳科金特种材料有限公司

Equipment room ventilation purification plant

The invention provides a device in a machine room for ventilation and purification, comprising a wind inlet device, a wind outlet device and a temperature-control system; the wind inlet device consists of a wind inlet mechanism and a wind duct pipe; the wind duct pipe is arranged on the external side wall of the machine room wall; the upper end of the wind duct pipe is open for air inlet and the lower end thereof is connected with the wind inlet mechanism; the wind inlet mechanism is internally provided with an air filter and a wind inlet DC fan; the air filter is arranged at the outlet of the lower end of the wind duct pipe; the wind inlet DC fan extends along the central line direction of the air filter and is arranged in the wind inlet opened on the machine room wall; the wind outlet device is provided with a wind outlet DC fan which is arranged in the wind outlet opened on the machine room wall; and the wind outlet is higher than the wind inlet by at least 1 meter. The device can replace the air conditioner in the machine room, can reduce the temperature in the machine room, can ensure that the base station equipment can run safely, reliably and stably, and can greatly reduce the electric energy consumption, thus greatly reducing the running cost of the communication and telecommunication enterprises; simultaneously, the device has active propulsion function on the energy-saving and emission reduction, environmental protection and ecology.
Owner:POWERCITY ELECTROMECHANICAL & EQUIP

Method for preventing cold steel in vacuum tank from bonding in RH vacuum cycle degassing process

The invention provides a method for preventing cold steel in a vacuum tank from bonding in the RH vacuum cycle degassing process. The method comprises the steps that (1) a steel ladle adopts a normaltransfer ladle and the transfer time is less than 60 minutes; (2) molten steel enters an RH refining furnace, the temperature of deoxidized molten steel is controlled to be greater than 1620 DEG C, and the temperature of non-deoxidized molten steel is controlled to be greater than 1600 DEG C; (3) when the RH refining furnace is subjected to OB temperature rise or OB forced decarburization, the vacuum degree in the vacuum tank is 5-15 kpa and the circulation gas flow is 1400 NL/min; (4) in 5 mins when the decarburization of the RH refining furnace is carried out, the circulation gas flow is controlled at 1600 NL/min, and during the period from the 5 mins to the time the decarburization is finished, the circulation gas flow is controlled at 2000 NL/min; (5) 3 mins after aluminum is added tothe molten steel for deoxidation, other alloys are added; (6) after the molten steel is alloyed, 200 kg desulfurizing agent is added; (7) the temperatures of an upper part tank and a hot bending pipeare increased by employing a top gun to heat, wherein the gun position of the top gun is 8.5 m, the flow of gas is 200 NM<3>/h, and the flow of oxygen is 220 NM<3>/h; and (8) when the pure degassing cycling time of the molten steel is greater than 8 mins, treatment is finished. The cold steel in the vacuum tank can be prevented from bonding effectively, and the operation rate of the RH refining furnace is raised.
Owner:SHANGHAI MEISHAN IRON & STEEL CO LTD

Narrow-range production control method of rare earth elements La and Ce in rare earth bearing steel

The invention discloses a narrow-range production control method of rare earth elements La and Ce in rare earth bearing steel. The control method comprises the steps of converter smelting, LF ladle refining, VD vacuum refining, and continuous casting. At the step of LF ladle refining, a high-alkalinity refining slag system is adopted; during the early and middle period, deoxidation and desulfuration are facilitated through bottom-blowing gas forced mixing, and inclusions in molten steel are adsorbed; and during the later period of LF ladle refining, a reducing atmosphere can be maintained through bottom-blowing gas weak mixing to prevent secondary oxidation of the molten steel; and before VD refining vacuum treatment, a steel rare earth containing barrel is used for conducting rare earth alloying, then the inclusions in the steel are promoted to be modified and float up through VD high-vacuum treatment, soft blowing and still standing, and the purity of the molten steel is improved. Through the narrow-range production control method of the rare earth elements La and Ce in the rare earth bearing steel, the problems that rare earth elements are active and easy to oxidize and cannot be added to the steel accurately and narrow-range control cannot be achieved are avoided; and the production efficiency of the bearing steel containing rare earth can be substantially improved, and theproduction cost can be greatly reduced.
Owner:SHIJIAZHUANG IRON & STEEL

Casting process of ultralow-temperature valve casting

The invention discloses a casting process of an ultralow-temperature valve casting. The casting process comprises the steps of production preparation, smelting, casting, sand removing, finishing and the like. The content of ferrite in austenite is reduced by reducing the chromium/ nickel equivalent ratio so as to avoid or reduce the ferrite embrittlement and martensite transformation of austeniticstainless steel. The element nitrogen is introduced to reduce the content of harmful elements sulfur and phosphorus. Silicon-calcium alloy and rare earth elements are introduced during molten steel deoxidation, so that the oxygen content and the impurity ratio are reduced. Measures such as the outage of a slagging process are adopted to improve the low-temperature impact resistance of the casting. In addition, more improvements have been made in the wall thickness difference of the casting, molten steel purification, a casting system, casting dead head cutting, shot blasting operation, heat treatment and the like since the start of the design of the casting process. Check results indicate that the valve casting produced by the casting process is stable in size stability and sealing performance after being subjected to treatment at the temperature of -196 DEG C, has the plasticity and toughness in a low-temperature environment, and is better in comprehensive usability.
Owner:JIANGSU EVALVE GRP

Nitrogen and phosphorus co-doped carbon coated MoO3-x and preparation method thereof

The invention discloses nitrogen and phosphorus co-doped carbon coated MoO3-x and a preparation method thereof. Phosphomolybdic acid and N-methyl imidazole serve as raw materials, a yellow precipitateis prepared through precipitation in the preparation process, and impurities in the process products are washed with a mixed solution of cyclohexane and ethanol, so the purity of the reaction products is improved; a nitrogen and phosphorus co-doped carbon coated MoO3-x composite material is prepared by a calcining method; and the whole preparation process is simple in technology, loose in experimental condition, low in cost and suitable for large-scale production. The nitrogen and phosphorus co-doped carbon coated MoO3-x composite material is molybdenum trioxide containing oxygen vacancy, theoxygen vacancy serves as a shallow donor and the density of current carriers can be increased, so that the electrical conductivity of the material can be improved. According to discovery from that the nitrogen and phosphorus co-doped carbon coated MoO3-x composite material is subjected to charge and discharge capacity test under 100 mA/g, the specific discharge capacity and the specific charge capacity are 1077 mAh g<-1> and 787 mAh g<-1>, and the prepared composite material has excellent electrochemical activity.
Owner:SHAANXI UNIV OF SCI & TECH

Continuous casting production method of sulfur-containing and aluminum-containing high calcium steel

ActiveCN110343802AImprove purityInhibits the formation of CaSManufacturing convertersSlagDeoxygenation
The invention discloses a continuous casting production method of sulfur-containing and aluminum-containing high calcium steel. The continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel includes working procedures of converter smelting, LF (ladle furnace) ladle refining, VD (vacuum distillation) vacuum refining and continuous casting. The continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel uses high alkalinity refining slags in the earlier stage of the LF ladle refining process, thereby facilitating deoxygenation and desulfurization, and absorbing inclusions in steel liquid, and then reduces alkalinity of the refining slags in the middle and later stages, thereby inhibiting generation ofCaS, and improving the yield of Ca; and performs wire feeding process alloying and soft blow after vacuum breaking of the VD vacuum refining, achieves even steel liquid constituents and temperature for the steel liquid, facilitates upward floating of the inclusions in the steel liquid, improves purity of the steel liquid, achieves the upward floating of the inclusions in the steel liquid throughstanding, and further improves the purity of the steel liquid. The continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel reduces occurrence rate of anozzle clogging problem in the continuous casting process of the sulfur-containing and aluminum-containing high calcium steel, and compared with a current traditional mold casting process, the continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel can substantially improve production efficiency of the sulfur-containing and aluminum-containing highcalcium steel, and substantially reduces production cost.
Owner:SHIJIAZHUANG IRON & STEEL
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