8 results about "Decarburization" patented technology

The invention discloses a mass spectrometer based RH dynamic decarbonization method and device for real-time calculation of carbon content when in vacuum oxygen decarburization, and realization of automatic gun lifting and stopping of oxygen blowing when the carbon content of molten steel reaches target carbon content. The decarbonization method comprises the following steps: when a heat is started, the weight, initial component and target component data of the molten steel is collected, in the smelting process, waste gas real-time flow rate acquired by a waste gas flow meter and waste gas real-time component acquired by a mass spectrometer are collected; according to relevant information of the molten steel, and relevant data of the collection and analysis time delay of the waste gas and gun lifting and blowing-stop time delay of a top gun, the carbon content of the molten steel is calculated in real time, and when the current carbon content is smaller than or equal to the target carbon content, a PLC (programmable logic controller) is notified to stop oxygen blowing and lift the gun. The mass spectrometer based RH dynamic decarbonization device can realize the automatic control of mass spectrometer based RH dynamic decarbonization, is precise in control of process and high in production precision, can shorten the smelting cycle, and reduces the cost.

The invention discloses a modification technology of an aluminum deoxidization product of non-oriented silicon steel. After vacuum decarburization and deoxidization through the RH procedure, powder spray is conducted in a vacuum chamber, so that the aluminum deoxidization product is changed into liquid-state calcium aluminate from aluminum oxide, the powder agent for powder spray comprise not smaller than 90% of CaO, 2-5% of CaF2 and 2-5% of Al2O3. The modification technology of the aluminum deoxidization product of the non-oriented silicon steel can solve the flocculating flow problem of a continuous casting nozzle, achieves sequence casting and can lower the product surface inclusion defect, the number of sequence casting heats reaches 12 or over, and the product surface inclusion is greatly lowered.

The invention belongs to the technical field of heat treatment of steel and iron materials, and particularly relates to a continuous spheroidizing annealing method for high-carbon chromium bearing steel round steel. The method comprises the steps that high-carbon-chromium bearing steel round steel in a hot rolling state is loaded into a roller hearth type continuous annealing furnace to be heated, the heating time is 3-3.5 h, and the heating rate is 200-250 DEG C/h; after heating to 790-810 DEG C, keeping the temperature for 3.5-4 hours to finish primary isothermal treatment; cooling treatment is carried out, rapid cooling is carried out to 710-730 DEG C, heat preservation is carried out for 6.5-7 h, and then secondary isothermal treatment is carried out; after secondary isothermal treatment, furnace cooling is carried out to 600-650 DEG C, then furnace discharging and air cooling are carried out to room temperature, and continuous spheroidizing annealing treatment is completed; after annealing, the Brinell hardness of the high-carbon chromium bearing steel is 180-200 HBW, the total decarburized layer depth is smaller than or equal to 0.8% of the nominal diameter, the spheroidized structure is 2.0-3.0 grades, the uniformity is good, and necessary structure preparation is made for obtaining good comprehensive performance.

The invention discloses a preparation process of an improved sulfur-resistant sintering flue gas decarburization catalyst, which comprises the following steps: adding transition metal salt, phosphoric acid and deionized water into a reactor, heating, stirring and reacting, and stopping stirring after the reaction is finished; cooling, adding titanium dioxide, and continuously heating and stirring; a first reactant is obtained; heating the first reactant, removing the solvent to evaporate the solution to dryness, drying the remainder, putting the remainder into a tubular furnace, introducing inert gas for calcining, and cooling to room temperature; the improved sulfur-resistant sintering flue gas decarburization catalyst is obtained; the improved sulfur-resistant sintering flue gas decarburization catalyst is a CuTiPO catalyst; the obtained improved sulfur-resistant sintering flue gas decarburization catalyst is ground, tableted, sieved and placed in a fixed bed reactor to detect the catalytic performance, the sulfur resistance of the decarburization catalyst is improved, active components are subjected to surface acid modification, the combining capacity of SO2 and the catalyst is inhibited, and the inactivation process of the decarburization catalyst is slowed down.

The invention relates heating equipment, in particular to uniform heating equipment for a cylindrical workpiece. The invention solves the technical problem to provide the uniform heating equipment forthe cylindrical workpiece with the advantages that uniform heating can be achieved, so that oxidation and decarburization of the metal surface can be avoided. The uniform heating equipment for the cylindrical workpiece comprises a base and sliding rails, wherein the sliding rails are symmetrically arranged at the front side and the back side of the left side of the upper part of the base; the uniform heating equipment for the cylindrical workpiece also comprises a rotating mechanism and a sliding plate; the sliding plate is glidingly arranged on the sliding rails at the front side and the back side; and the rotating mechanism is arranged at the left side of the upper part of the sliding plate. The uniform heating equipment for the cylindrical workpiece has the advantages that the uniformheating is achieved, so that the effect of avoiding oxidation and decarburization of the metal surface can be achieved; by manually rotating an operating crank, the sliding plate can rightwards move,so that the cylindrical workpiece is pushed into a heating box; and due to uniform temperature distribution in the heating box, the cylindrical workpiece can achieve the effect of uniform heating in the heating box in the heating process.

The invention provides a preparation method of an oriented electrical steel plate and the oriented electrical steel plate prepared by the method. The preparation method comprises the following steps: heating a plate blank; preparing a hot-rolled sheet by hot-rolling the heated slab; preparing a cold-rolled sheet by cold-rolling the hot-rolled sheet; carrying out decarburization annealing on the cold-rolled sheet; forming a ceramic coating on a part or all of one surface or two surfaces of the decarburized and annealed cold-rolled sheet by using a chemical vapor deposition (CVD) process; and performing final annealing on the cold-rolled sheet on which the ceramic coating layer is formed.