46results about How to "Reduce carbon increase" patented technology

The invention relates to a non-oriented electrical steel plate Which comprises the following components in percentage by mass: less than or equal to 0.0060 percent of C, 0.60 to 0.80 percent of Si, 0.20 to 0.40 percent of Mn, less than or equal to 0.10 percent of P, less than or equal to 0.0080 percent of S, 0.015 to 0.025 percent of Als, 0.001 to 0.002 percent of B, and the balance of Fe and unavoidable impurity elements. The production method comprises the following steps of smelting in a converter, argon blowing to steel ladle, RH vacuum treatment, refining of an LF furnace, continuous casting of a sheet billet, heat equalizing through a tunnel, fine rolling, cooling, coiling, acid pickling, cold rolling and continuous annealing. Compared with the prior art, the method is high in magnetic induction and low in iron loss. A manufacturing process for producing the non-oriented electrical steel plate by continuously casting and continuously rolling the sheet billet is provided for the first time, and the technical support is provided for production of a novel non-oriented electrical steel hot-rolling raw material with excellent environmental-protection performance by utilizing a sheet billet continuous-casting and continuous rolling production line.

The invention discloses a bi-metal bent pipe manufacturing process, which includes: assembling a foam pattern (1) of a bi-metal bent pipe lining and an outer steel pipe (2) that has through-holes (3) drilled on an outside wall, and plugging the through-holes (3) with foam bodies (4) so as to form a combined foam pattern; bonding the combined foam pattern with a pouring system (5) for foam molding of an evaporative pattern and a vent hole (6) to form an overall pattern, and placing the overall pattern in a sand box to conduct sand filling and molding; burning off the foam pattern in the overall pattern, then putting the sand box on a vibration pouring jolting platform to perform vibration pouring, carrying out heat preservation for some time, and then opening the box to clear up the casting, thus finishing manufacturing the bi-metal bent pipe. The process provided in the invention adopts non-vacuum vibration casting. The lining of the manufactured bi-metal composite bent pipe has a more compact and wear resistant texture, and the mechanical and metallurgical bonding degree outside the composite bent pipe is high, so that the outside toughness and wear resistance of the bi-metal bent pipe are effectively improved, the service life is prolonged, and the production cost of the bi-metal bent pipe is effectively reduced.

The casting method with hollow mold is an improved solid mold casting method, which has reduced carbon generation, improved carbon exhaust and reduced recarburization of casting by means of one or several measures of improving casting mold, exhausting gas to reduce pressure and setting reasonable casting system.

A low-carbon magnesia carbon brick containing a nanometer zinc oxide is characterized in that the low-carbon magnesia carbon brick comprises the four following raw materials by weight percentage: 80-94wt% of electric melting magnesia particles, 1-5wt% of crystalline flake graphite, 1-3wt% of metal Al and 1-5wt% of nanometer zinc oxide, and 2-4wt% of a phenol formaldehyde resin with the quantity of the weight percentage sum of the four raw materials. The low-carbon magnesia carbon brick utilizes the characteristics of the nanometer zinc oxide powders such as fine granularity, high activity at high temperature, moderate price, and the like to improve the microstructure of the low-carbon magnesia carbon brick, prompts the used metal Al antioxidant to sufficiently play the role and prepares the low-carbon magnesia carbon brick with excellent comprehensive performance and moderate price. The prepared low-carbon magnesia carbon brick can be used for the steel-making furnace, the refining furnace and the lining of the steel ladle in the steel metallurgical industry, reduces the carbon added in the molten steel, reduces the temperature reduction of the molten steel and is beneficial for improving the quality of the steel and saving the energy resource.

The invention discloses a refractory brick of a ladle slag line. The refractory brick is prepared from the following raw materials in parts by weight: 24-26 parts of waste magnesia brick, 46-48 parts of fused magnesite, 1-2 parts of -20mesh graphite powder, 3-5 parts of -100mesh silicon carbide, 15-17 parts of -100mesh zirconium oxide, 6-8 parts of -150mesh fused millite, 8-10 parts of magnesite powder, 2-3 parts of asbestos fibers, 4-6 parts of Suzhou bentonite, 10-12 parts of zirconium boride, 1.5-2.5 parts of -200mesh boron nitride, 2.5-3.5 parts of -200mesh cerium oxide, 2-3 parts of asphalt powder, 1-2 parts of phenolic resin, 3-5 parts of sodium hexametaphosphate and 16-18 parts of water, wherein the waste magnesia brick of which the granularity is -20 mesh to +40 meshes accounts for 50%; the waste magnesia brick of which the granularity is -40 mesh to +100 meshes accounts for 25%; the waste magnesia brick of which the granularity is -100 mesh to +200 meshes accounts for 25%; the fused magnesite of which the granularity is -5 mesh to +18 meshes accounts for 35%; the fused magnesite of which the granularity is -18 mesh to +80 meshes accounts for 35%; and the fused magnesite of which the granularity is -80 mesh to +150 meshes accounts for 30%.

The invention relates to the field of refractory materials and particularly relates to castable for a working layer of a refining ladle slag line as well as a preparation method and an application of the castable. The castable for the working layer of the refining ladle slag line comprises the following components in parts by mass: aggregates, matrix powder as well as a nano hydroxide composite sol suspension liquid. The refractory castable disclosed by the invention has slag penetration resistance and corrosion resistance which are equivalent to those of a magnesia carbon brick, but has relatively high bonding strength between the matrix and the aggregates, relatively strong integrity and relatively excellent impact resistance and thermal rock resistance, is suitable for integrally casting a slag line part to realize all casting of the ladle bottom, the ladle wall and the slag line part of the refining ladle, so that the construction time is greatly shortened, the labor power is saved, integral reinforcing is realized after one-time use, and the consumption of a great deal of refractory materials can be reduced.

The invention provides a novel refractory material for a low-carbon tundish working lining and a building method. The refractory material comprises the following components in percentage by mass: 65-75% of magnesia particles or/and olivine particles, 20-25% of magnesia fine powder, 2-5% of silica powder, 0.5-1.5% of sodium tripolyphosphate, 0-0.5% of paper fibers, 0.3-0.7% of rice hull fragments,0.5-2.5% of a plasticizer, 0-0.3% of organic fibers and 0-1% of an additive. The carbon residue rate of the refractory material is 0.2%-0.7%. The water adding amount is effectively reduced, and moltensteel recarburization is reduced; workers do not need to enter the tundish, construction is convenient, and labor intensity and harm of high-temperature environment construction are avoided; and layered smearing or spraying is avoided, and layered stripping of the working lining in the using process is prevented.

The invention discloses a preparation process for a refractory brick on a ladle slag line. The preparation process comprises the following steps of (1) placing waste magnesia bricks, fused magnesia, silicon carbide, zirconia, fused millite and magnesite powder into a mixer to be mixed for about 45-60 minutes; (2) adding graphite powder, asbestos fibers, Suzhou bentonite, zirconium boride, boron nitride and cerium oxide, and mixing for about 120-135 minutes; (3) adding asphalt powder, phenol formaldehyde resin, sodium hexametaphosphate and water, and further mixing for about 150-180 minutes; (4) molding by using a press machine, and drying a green brick at the temperature of 200 DEG C for 24 hours; and (5) calcining at the temperature of about 1800-1840 DEG C, and preserving the heat for about 16-18 hours. The refractory brick prepared by using the preparation method has the following excellent performances: molten steel is recarburized by at most 2.3ppm, the volume density is 3.05-3.15g/cm<3>, the apparent porosity is 1.5-2.5%, the normal-temperature compressive strength is larger than or equal to 45MPa, the 1400-DEG C high-temperature bending strength of buried carbon is larger than or equal to 33Mpa, and the 1400-DEG C linear expansion coefficient is 1.35-1.45%. Through measuring the thermal shock resistance of the refractory brick prepared by using the preparation process disclosed by the invention by using an air quenching method comprising the step of carrying out air cooling once at the temperature 1100 DEG C, the residual strength retention rate is measured to be 74-76%.

The invention relates to a submersed nozzle for steel making and continuous casting tundish, in particular to a non-oxide enhanced material for a slag line of a submersed nozzle. The material comprises the components in percentage by mass as follows: 5.5%-8% of ZrB2, 75%-78% of m-ZrO2, 6%-8% of graphite, 2%-3% of Al, 5%-6.5% of O'-Sialon, 1.0%-2.0% of Y2O3-PSZ and the balance of impurities; and 8-10% of a modified resin binding agent is additionally added. The non-oxide enhanced material for the slag line of the submersed nozzle has excellent corrosion resistance and plugging resistance, can effectively reduce carbureting of molten steel, and is more suitable for producing low -carbon steel and ultra-low carbon steel.

The invention discloses a smelting process of an ultra-low carbon stainless steel material, which includes EAF furnace smelting, LF furnace smelting, VOD furnace smelting, LF furnace final component adjustment; LF furnace smelting step includes steps of adding high carbon ferro-chrome, low-carbon ferrochromium, a nickel plate, and ferro-molybdenum in steel fluid, introducing an alloy elements andincreasing the carbon content; the VOD furnace smelting adopts the vacuum oxygen blasting and decarbonizing; the LF furnace final component adjustment includes the step of adjusting the final component of the steel fluid. Through introducing the high carbon alloy to increase the carbon content, the oxygen blowing and decarbonizing in the VOD furnace can fully release, the steel fluid temperature is improved, the Cr oxidization is reduced; the reduction time is shortened, the steel fluid cooling time is shortened, the time and opportunity of the electricity delivery and temperature rise are reduced; thus the steel fluid carbon increasing caused by the graphite electrode electricity delivery and temperature rise is reduced, and the carbon content is reduced.

The invention provides a tundish composite working lining. The inner layer of the tundish composite working lining is a dry material layer, the outer layer of the composite working lining is a coated layer, and the dry material layer and the coated layer are closely connected and compounded into an integrated structure. The dry material layer and the coated layer are combined into the composite working lining, the advantages of the dry material layer and the coated layer are combined, and the composite working lining has the advantages of convenient construction, difficult sintering, easy tundish tilting and recarburization reduction, etc.

The invention discloses a tundish protection casting method for ultra-low carbon steel. The tundish protection casting method comprises the following steps that S1, ultra-low carbon steel is cast, andduring casting, a tundish cover blowing device blows out mixed gas of carbon dioxide and argon; S2, when casting is started for 0-5min, the flow of the carbon dioxide gas in the mixed gas of the carbon dioxide and the argon blown out by the tundish cover blowing device is 1500-2500Nl/min; and S3, after the casting time is 5min, casting is finished, the volume fraction of the carbon dioxide gas is5%-15%, and the gas flow is 200-1500Nl/min. According to the method, the 5%-30% carbon dioxide gas is mixed in the tundish cover protection gas argon, the carbon dioxide gas enters molten steel to react, and carbon monoxide bubbles float up in the molten steel to be discharged. The carbon dioxide gas can consume carbon in the steel under the casting temperature condition, the concentration of thegenerated carbon monoxide gas is extremely low, and the carbon monoxide gas is fully burnt out when escaping out of a tundish, and the safety problem cannot be caused.

The invention relates to the technical field of casting forming and casting, in particular to an evaporative pattern casting burned shell type casting process. The process comprises the primary process flows of molding, riser and pouring gate adhering, coating, drying, burning, box burying, pouring, cleaning, polishing and machining. A casting produced by the casting process has the advantages ofbeing high in surface smoothness, high dimensional precision and the like, and the evaporative pattern casting burned shell type casting process not only can meet the demand on precision of the casting, but also can lower the production cost and reduce the production pollution greatly, can meet the demand on top-grade precise casting of complex structure, and is green and environment-friendly in shell manufacturing process.

The invention relates to a method for preparing a low-carbon refractory brick from needle coke. The method sequentially comprises the following steps: preparing aggregates; preparing premixed powder; and mixing, molding and drying, so as to produce the low-carbon refractory brick, wherein a material composition of a product is optimized by adding the needle coke in the mixing process; a mesh structure of carbon fibers can be formed in situ in a service environment; and the needle coke has the advantages of high mechanical strength, good oxidation resistance, low energy consumption and the like, and also has the characteristics of high purity, low electrical resistivity, low coefficient of thermal expansion, and high impact resistance of graphite. Due to these unique properties, the mean pore diameter is reduced, and the high-temperature strength is increased even if the amount of the graphite is greatly reduced, or even the graphite is not used; the heat conductivity is reduced; and meanwhile, the product is capable of achieving the same thermal shock resistance, slag resistance and penetration resistance as the traditional high-carbon magnesia carbon brick.

The invention discloses a smelting method for copper-clad steel. A smelting process comprises BOF (Basic Oxygen Furnace) smelting-LF (Ladle Furnace) refining-small square billet continuous casting working procedures in sequence, wherein the BOF smelting controls decarburization strength and tapping temperature, an end point [C] is less than or equal to 0.040%, T is equal to 1620-1680DEG C, and slags are pushed off for tapping; the LF refining controls slag ingredients and static mixing time, (FeO+MnO) is less than or equal to 1.0%, the static mixing time is longer than or equal to 10min, and slag surface deoxidization and calcium feeding processing are carried out; the square billet continuous casting controls pouring temperatures and electromagnetic stirring technologies, T is equal to 1560-1620DEG C, and liquid surface fluctuation and casting speed can be stabilized. Through the smelting method for the copper-clad steel, on the basis of the accurate control on each smelting link, a smelting working procedure of the copper-clad steel is simplified, pre-desulfurization and vacuum processing are omitted, while product quality is kept, production efficiency is improved, cost is lowered, and competitive power is improved.

The invention discloses a production process for evaporative pattern centrifugal casting. The production process comprises the following steps of S1, designing of a pouring gate; S2, designing of a riser; S3, a box loading (manufacturing) process; and S4, a pouring process. Meanwhile, a space with the size reduced due to solidification is filled with molten metal under the action of centrifugal force, and the feeding effect is good; meanwhile, a large number of crystal nuclei are generated through fracture of regrowth dendritic crystals under the action of the centrifugal force and exciting force, crystal grains are refined, and the density of a product is further improved; and the molten metal in the pouring gate and the riser (a slag collecting riser or a feeding riser) moves towards theinterior of a casting model under the action of the centrifugal force, the utilization rate of the molten metal is increased, the yield of centrifugal casting is also increased, and the machining amount of a centrifugal casting machine is reduced.

A cast steel coating for vacuum lost foam casting comprises components in percentage by weight as follows: 30-45% of water, 2-5% of sodium bentonite, 1-4% of a suspending agent, 2-4% of an organic binding agent, 50% of emery powder and 0.2-1% of an aid; the performance of the cast steel coating for vacuum lost foam casting depends on composition, a preparation technology, an application technology and a drying technology of the coating. With the adoption of the coating, defects such as recarburization, air holes and the like of cast steel pieces are overcome, the coating is stable in comprehensive coating performance, low in coat and ideal in effect, and the comprehensive product percent of pass of the vacuum lost foam cast steel pieces can be ensured to be higher than 97%.