36results about How to "Purify molten steel" patented technology

The invention relates to a preparation method of a normal temperature solidified magnesium carbon brick, belonging to the technical field of fireproof material. The preparation comprises the following steps: mixing small size magnesia and calcium oxide powder in a mixer to obtain a premix; adding the rest magnesia and phenolic resin binder and carbon in a mixing roll for mixing; then adding the premix for mixing to obtain mixed mud; putting the mixed mud in a press die for forcing molding to obtain a formed magnesium carbon brick; and putting the formed magnesium carbon brick for preservation at room temperature for 2-4 days to obtain the magnesium carbon brick. The mixing order and mixing time are different depending on the different selected mixing devices. If a tilting reverse flow mixer is used for mixing, the premixing technology can be omitted, and the required materials are directly put into the mixer for mixing to obtain the mixed mud. According to the invention, the technologies of seting, baking and the like are omitted, energy and labor are saved, and the discharge of pollutant is reduced.

The invention belongs to the technical field of special steel and smelting of the special steel, and relates to a boron-adding high-carbon clean steel vacuum induction furnace smelting preparation method. Boron-adding high-carbon clean steel comprises, by mass, 0.67%-0.75% of C, 0.15%-0.37% of Si, 0.30%-0.80% of Mn, not larger than 0.012% of P, not larger than 0.006% of S, 0.20%-0.50% of Cr, not larger than 0.30% of Mo, not larger than 0.30% of V, 0.002%-0.100% of B and the balance Fe and inevitable impurities. The preparation method comprises the following steps of vacuum induction furnace smelting, smelting, continuous casting and the like. By means of the method, the mechanical property of the steel can be greatly improved, the product tensile strength Rm is larger than or equal to 1450MPa, the yield strength R0.2 is larger than or equal to 1350 MPa, a plate of the steel is used on a sintering saw web mother blank, the produced plastic deformation damage is small, the service lifeof the steel is prolonged, and the production cost of the steel is low.

The invention discloses a silicon-manganese coal ash deoxidier for steelmaking and a preparation method of the silicon-manganese coal ash deoxidier. The silicon-manganese coal ash deoxidier comprises the following raw materials in parts by weight: 90 to 110 parts of quartz sand, 10 to 15 parts of calcareous shale, 20 to 25 parts of coal ash, 10 to 15 parts of fluorite, 3 to 5 parts of charcoal, 5 to 8 parts of waste aluminum powder, 25 to 30 parts of attapulgite and 10 to 15 parts of black manganese ore. The silicon-manganese coal ash deoxidier has rationality in formula; and the coal ash, the charcoal and the attapulgite are adopted for serving as the raw materials. The deoxidier has good deoxidizing effect; with the adoption of the deoxidier, the contents of nonmetal impurities in the steel can be reduced, the form of the impurities can be changed, the molten steel can be purified, the liquidity of the molten steel can be improved, and the molten steel continuous casting process is smooth; and the continuous casting water ports are out of nodules, thus the continuous casting can be smoothly carried out, the service performance and the service life of steel can be improved and prolonged, and the cost of steelmaking can be reduced.

The invention belongs to the technical fields of special steels and smelting thereof and relates to a zirconium-added high-carbon microalloyed high-strength carbon clean steel and a preparation methodthereof. The high-strength carbon clean steel comprises, by mass percentage, 0.67-0.75% of C, 0.15-0.37% of Si, 0.30-0.80% of Mn, less than or equal to 0.012% of P, less than or equal to 0.006% of S,0.20-0.50% of Cr, less than or equal to 0.30% of Mo, less than or equal to 0.30% of V, 0.002-0.100% of Zr and the balance Fe and inevitable impurities. According to the high-strength carbon clean steel, the contents of the harmful elements S, P, O and N are further lowered; the inclusion content is lowered; molten steel is purified; mechanical performance of the steel can be greatly improved; andreasonable mixing ratios of all components of the high-strength carbon clean steel and steps and parameters of the preparation method cooperatively act to jointly further improve mechanical performance of the high-strength carbon clean steel.

A method for smelting ultra-advanced duplex stainless steel made of CD3MWN, which is designed for the internal control composition during smelting of duplex stainless steel; wherein C≤0.030 wt%, Si≤0.90 wt%, Mn is 1.20-2.50 wt%, P≤0.020 wt%, S≤0.015 wt%, Cr 26.2-27.5 wt%, Ni 6.2-7.6 wt%, Mo 2.2-3.4 wt%, Cu≤0.80 wt%, W≤0.80 wt%, N 0.32-0.38 wt%, B is 0.0010-0.0100 wt%, Ba is 0.0002-0.0100 wt%, Ce+La is 0.005-0.030 wt%; %Cr+3.3(%Mo+0.5%W)+16%N≥45, precise control of trace The content of elements B, Ba, Ce, and La; increase the N content to more than 0.30%, and at the same time avoid nitrogen pores in the casting; minimize the content of harmful elements such as sulfur, oxygen, hydrogen and other elements, and improve the liquid steel. purity. The poured casting has high strength and excellent corrosion resistance. The ratio of ferrite phase and austenite phase in stainless steel is close to 50%. The service life of the casting is prolonged, the manufacturing cost is greatly reduced, and the goals of energy saving, consumption reduction, and environmental protection are realized.

The invention discloses a silicon-barium attapulgite deoxidier for steelmaking and a preparation method of the silicon-barium attapulgite deoxidier. The silicon-barium attapulgite deoxidier comprises the following raw materials in parts by weight: 70 to 80 parts of quartz sand, 3 to 5 parts of celestite, 10 to 15 parts of kaolinite, 10 to 15 parts of limestone, 3 to 5 parts of table salt, 5 to 10 parts of charcoal, 5 to 10 parts of attapulgite, 20 to 30 parts of vermiculite and 10 to 15 parts of black manganese ore. The silicon-barium attapulgite deoxidier has rationality in formula; and the celestite, the table salt, the charcoal, the attapulgite and the vermiculite are adopted as the raw materials. The deoxidier has good effect on deoxidizing; with the adoption of the deoxidier, the contents of nonmetal impurities in the steel can be reduced, the form of the impurities can be changed, the molten steel can be purified, the liquidity of the molten steel can be improved, the molten steel is smooth in continuous casting; and the continuous casting water ports are out of nodules, thus the continuous casting can be smoothly carried out, the service performance and the service life of steel can be improved and prolonged, and the cost of steelmaking can be reduced.

The invention belongs to the technical field of special steel and smelting, and relates to a method for preparing zirconium-adding high-carbon clean steel through smelting by a vacuum induction furnace. The zirconium-adding high-carbon clean steel is prepared from the following components in percentage by mass: 0.67 to 0.75 percent of C, 0.15 to 0.37 percent of Si, 0.30 to 0.80 percent of Mn, lessthan or equal to 0.012 percent of P, less than or equal to 0.006 percent of S, 0.20 to 0.50 percent of Cr, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of V, 0.002 to0.100 percent of Zr, and the balance Fe and inevitable impurities. The preparation method comprises the following steps of smelting through the vacuum induction furnace, smelting, continuously castingand the like. According to the product prepared through the method provided by the invention, the tensile strength Rm is larger than or equal to 1400MPa, the yield strength R0.2 is larger than or equal to 1300MPa, and when a panel of the product is applied to sintering a saw blade mother plate, the produced plastic deformation damage is less, so that the life is prolonged, and the steel production cost is low.

The invention provides a manufacturing method of steel. The method comprises the following steps: roughly melting molten steel; adding a pre-deoxidizer into a steel ladle in a process from tapping to ladling; and refining the molten steel in an LF (ladle furnace), wherein aluminum is added into the molten steel to perform precipitation and deoxidization in a process of refining the molten steel in the LF furnace; adding the synthesized residues into the ladle to heat; and adding a diffusible deoxidizer into the ladle to perform strengthened deoxidization after the synthesized residues are molten. According to the manufacturing method of steel in the invention, the molten steel can be purified, clogging of a water gap is effectively prevented, and the casting performance of the molten steel is improved. The manufacturing method of steel in the invention is simple, convenient and easy to operate, and has a good application prospect.

The invention discloses a silicon-manganese-calcareous shale deoxidizer and a preparation method thereof. The silicon-manganese-calcareous shale deoxidizer comprises the following raw materials in parts by weight: 40-50 parts of quartz sand, 15-20 parts of black manganese ore, 5-10 parts of celestine, 50-60 parts of limestone, 20-30 parts of calcareous shale, 5-10 parts of scrap iron, 10-20 parts of coal ash, 10-15 parts of vermiculite and 5-10 parts of sepiolite. The silicon-manganese-calcareous shale deoxidizer disclosed by the invention has the advantage that a formula is reasonable and the calcareous shale, the scrap iron, the coal ash, the vermiculite and the sepiolite are adopted as raw materials, so that the deoxidizer has a good deoxidizing effect, the content of nonmetal impurities in steel can be reduced, the forms of the impurities can be changed, molten steel is purified, the liquidity of the molten steel is improved, the continuous casting process of a molten steel blank is smooth, no accretion is generated at a continuous casting nozzle, thus, the smooth casting production is facilitated, the use performance of the steel is improved and the service life of the steel is prolonged; and the steelmaking cost is reduced.

The invention discloses a composite silicomanganese deoxidizer and a preparation method thereof. The composite silicomanganese deoxidizer consists of the following raw materials in parts by weight: 30-35 parts of quartz sand, 10-20 parts of black manganese ore, 15-20 parts of irony shale, 60-65 parts of fly ash, 10-15 parts of bauxite, 1-2 parts of salt and 30-40 parts of vermiculite. The composite silicomanganese deoxidizer is reasonable in formula, and the fly ash, the bauxite and the salt are added in the raw materials. The composite silicomanganese deoxidizer has good deoxidizing effect, and can reduce the content of non-metallic inclusions in steel and change the forms of the inclusions so as to purify the liquid steel and improve the molten steel liquidity. The molten steel continuous casting billet process is smooth, and nodulation does not occur at a continuous casting gate, so that smooth production of continuous casting is facilitated the usability of the steel is improved, the service life of the steel is prolonged, and the steelmaking cost is reduced.

The invention discloses a silicon-manganese-barium alloy deoxidier and a preparation method of the silicon-manganese-barium alloy deoxidier. The silicon-manganese-barium alloy deoxidier comprises the following raw materials in parts by weight: 30 to 35 parts of quartz sand, 10 to 20 parts of barite, 15 to 20 parts of kaolinite, 55 to 65 parts of coal ash, 10 to 15 parts of waste aluminum powder, 25 to 35 parts of attapulgite, 20 to 25 parts of sepiolite and 20 to 25 parts of black manganese ore. The silicon-manganese-barium alloy deoxidier has rationality in formula; the coal ash, the waste aluminum powder, the attapulgite, the sepiolite and the black manganese ore are added to the raw materials, thus the cost is low. The deoxidier has good effect on deoxidizing; with the adoption of the deoxidier, the contents of nonmetal impurities in the steel can be reduced, the form of the impurities can be changed, the molten steel can be purified, the liquidity of the molten steel can be improved, the molten steel is smooth in continuous casting; and the continuous casting water ports are out of nodules, thus the continuous casting can be smoothly carried out, the service performance and the service life of steel can be improved and prolonged, and the cost of steelmaking can be reduced.

The invention belongs to the technical field of special steel and smelting of the steel, and relates to a zirconium-added high-carbon pure steel medium-frequency induction furnace smelting preparing method. The zirconium-added high-carbon pure steel is composed of components including 0.67 to 0.75% of C, 0.15 to 0.37% of Si, 0.30 to 0.80% of Mn, not larger than 0.012% of P, not larger than 0.006%of S, 0.20 to 0.50% of Cr, not larger than 0.30% of Mo, not larger than 0.30% of V, 0.002 to 0.100% of Zr, and the balance Fe and inevitable impurities. The preparing method comprises the steps of medium-frequency induction furnace smelting, LF, continuous casting treatment and the like. Compared with an existing product, the product has the beneficial effects that the mechanical performance is greatly improved, the tensile strength Rm is larger than or equal to 1400 MPa, the yield strength R0.2 is larger than or equal to 1300 MPa, the board is used for a sintered saw blade mother board, plastic deformation damage is small, the service life is prolonged, and the steel production cost is low.

The invention discloses an expansion casing for a heavy oil thermal recovery well and a manufacturing method of the expansion casing. The expansion casing comprises the chemical components of, by mass percent, 0.18-0.32 of C, 0.12-0.32 of Si, 1.1-1.7 of Mn, 0-0.005 of S, 0-0.020 of P, 0.1-0. 6 of Cr, 0.15-0.50 of Mo, 0.10-0.30 of Cu, 0.01-0.05 of Nb, 0.003-0.012 of Ce-La-Y mixed rare earth, and the balance Fe and unavoidable impurities. The manufacturing method comprises the steps of plate coil uncoiling, longitudinal shearing, edge milling, FFX molding, HFW welding, weld joint online heat treatment, weld joint inner and outer burr finishing, whole casing special heat treatment, hot straightening treatment, nondestructive inspection and thread machining. After being subjected to expansion deformation, the expansion casing has high strength, good toughness and heat stability and is suitable for the heavy oil thermal recovery well.

The deoxidizer for high-grade steel milting comprises: selecting ferro-silico aluminum, Ca2C and aluminum powder with some weight ratio as the material; breaking the ferro-silico aluminum and Ca2C till some size; dipping the Ca2C into organic oil for given time to take out and mix with the aluminum; then adding ferro-silico aluminum to stir evenly. This product has well desulfurization effect to reduce non-metal impurity and change inclusion shape, prolongs steel service performance and time, and can replace traditional product.