20 results about "Carbon Additive" patented technology

The invention provides high-phosphorus wear-resistant gray cast iron and a production method thereof, and belongs to the technical field of high-phosphorus wear-resistant gray cast irons.The production method comprises the following steps that raw materials are inspected; smelting is conducted, specifically, waste steel, gray iron foundry returns, pig iron, a carburant and ferrophosphorus are sequentially put into an electric furnace to be melted; nickel, chromium and copper are sequentially added into the electric furnace, and the molten iron is quenched and tempered, so that the final components of the molten iron meet the requirements; molding: preparing a casting mold; a casting ladle is preheated, meanwhile, an inoculant is placed at the bottom of the casting ladle, then molten iron is poured into the casting ladle, and the inoculant is added along with flow in the process that the casting ladle conducts casting into the mold; box opening: the box is opened after the temperature is reduced, and the formed high-phosphorus wear-resistant gray cast iron is obtained; and performing heat treatment: performing high-temperature annealing on the high-phosphorus wear-resistant gray cast iron, and inspecting the casting to obtain a final finished product. According to the technical scheme, the purpose of improving the abrasion resistance and the mechanical performance of the gray cast iron is achieved.

The invention belongs to the technical field of metallurgy, and particularly relates to a smelting method of low-titanium high-carbon chromium bearing steel. Through full-process titanium content control, the method comprises the following steps: adopting low-titanium waste steel and molten iron, and controlling the alkalinity of the electric furnace slag to be 2.0-4.0 and the FeO + MnO content to be 20-30%; slag is strictly stopped during tapping, and the slag discharge amount is controlled to be smaller than or equal to 3 kg per ton of steel; after tapping, adding a low-titanium ferrochrome alloy, standing, and removing titanium-containing top slag; during LF refining, a low-titanium iron alloy, a carburant and a diffusion deoxidizing agent are used, and a barium composite slag modifier composed of BaO, CaO, Al2O3 and rare earth oxide is added; rH is matched with vacuum degassing and soft argon blowing stirring; and during continuous casting, double-layer crystallizer casting powder composed of low-oxidability lower-layer slag and CaO2-containing upper-layer covering slag is adopted. Through the synergistic effect of the links, the titanium content of the rolled metal is stably controlled to be 0.001% or below finally, titanium nitride inclusions are effectively reduced, and the fatigue life of the bearing steel is remarkably prolonged.

The application discloses a kind of corrosion-resistant reducing flange and preparation method thereof, belong to reducing flange preparation technical field, manganese iron, silicon iron, iron ingot, copper ingot and graphite quality carbon additive are added into smelting furnace, smelt under argon protection, then add slag remover and stir evenly, after deslagging, rare earth alloy with silica coated magnesium oxide nano powder smelted is added, continue smelting, alloy liquid is cast into mould, and is cast into shape, it is immersed in electrolyte and is treated by anodic oxidation, surface is coated with polyamide imide primer, after solidification, polytetrafluoroethylene powder finish is sprayed using electrostatic spraying equipment, after electrostatic spraying, reducing flange semi-finished product is transferred to curing oven, and is cooled and taken out, to obtain a kind of corrosion-resistant reducing flange;The corrosion-resistant reducing flange has good high adhesion, high temperature resistance, long-acting anticorrosion performance.

The invention provides a method for reducing oxide inclusion of round steel, which is characterized by comprising the following steps: (1) feeding blast furnace molten iron into a converter, sampling and analyzing the content of Si in the molten iron, and adding scrap steel according to the content of Si in the molten iron, (2) blowing oxygen into the converter for blowing, adding active lime, light-burned dolomite and a secondary recycling slag agent for slagging in the blowing process, (3) rotating the converter to a steel tapping side, enabling molten steel to flow out to a steel ladle, adding a composite deoxidizer to deoxidize the molten steel, and then adding a carburant; (4) feeding the molten steel into a vacuum tank of a VD furnace for vacuum blowing; (5) adding ferromanganese and ferrosilicon into the molten steel; and (6) feeding the molten steel into a continuous casting machine for casting, and cooling to obtain a casting blank. By controlling the output of converter final slag oxides and reducing oxide inclusions in steel, the product quality is guaranteed, a foundation is laid for production of high-quality clean steel, the recovery rate of Si and Mn elements in the steel is increased, and the alloy cost is effectively reduced.

The invention relates to the technical field of low carbon, in particular to a low-carbon building material, and particularly discloses a high-strength luxury material imitating natural lines and a preparation method of the high-strength luxury material. The luxury material comprises 25-35 parts of feldspar, 20-30 parts of waste glass leftover materials, 10-20 parts of quartz sand, 8-15 parts of kaolin, 3-5 parts of zinc oxide, 2-4 parts of strontium carbonate, 6-10 parts of aluminum oxide, 5-10 parts of calcite, 2-4 parts of boric acid, 3-6 parts of silicon nitride micropowder, 2.5-6 parts of a low-carbon additive, 2-4 parts of a composite nucleating agent, 1-3 parts of fluorite, 2-4 parts of sodium carbonate, 0.3-0.8 part of antimony oxide and 0.5-1 part of nano cerium oxide. 0.5-3 parts of a coloring oxide; the preparation method of the material comprises the steps of sectional melting atmosphere control, multi-stage temperature control crystallization, high-proportion waste recycling and the like. The bending strength of the obtained high-strength luxury material is larger than or equal to 650 MPa, the fracture toughness is larger than or equal to 7.0 MPam / , the utilization rate of industrial solid waste is larger than or equal to 30%, and the problems that a traditional stone-like material is low in strength, poor in color stability and insufficient in environmental protection property are effectively solved.

The invention discloses a preparation method of green sand as-cast high-strength and high-plasticity nodular cast iron, and belongs to the technical field of metal material casting. Comprising the following steps that S1, raw material smelting is conducted, specifically, pig iron, waste steel and foundry returns are charged into a furnace, then silicon carbide and a carburant are added in a segmented mode, after all the raw materials are dissolved into molten iron, slag removal and slag salvaging are conducted, and silicon carbide is added for pretreatment; s2, spheroidizing and inoculation treatment: adding a spheroidizing agent into a spheroidizing ladle, covering a steel sheet covering agent and a silicon-barium-calcium inoculant, adding molten iron, performing spheroidizing and ladle bottom inoculation, and adding a composite inoculant along with the molten iron in the ladle-to-ladle process; s3, pouring: adding a composite nucleating agent when the molten iron is poured into a casting mold, and cooling to obtain a product; the composite nucleating agent comprises the following components in percentage by weight: 70.0%-80.0% of Si, 0.05%-0.15% of Sr and 0.2%-0.6% of Ti; 0.1%-0.3% of Nb and the balance Fe. Through reasonable formula improvement and process improvement, the prepared nodular cast iron has good strength and toughness and good comprehensive performance.

The invention discloses a method for efficiently producing a coal-quality carburant by optimizing coal blending, which comprises the following steps: (1) crushing bituminous coal and anthracite to a set particle size, and performing ore blending optimization and uniform mixing to obtain mixed coal; (2) distributing the mixed coal into a rotary kiln, calcining in the rotary kiln, and discharging a calcined product into a cooler to obtain a cooled calcined product; and (3) crushing and screening the cooled calcined product to obtain the carburant. Part of bituminous coal is added as a raw material, so that the bituminous coal with high volatile matter escapes more volatile matter in a kiln, and the volatile matter contains a large amount of combustible gas such as H2, CO or organic matters, so that the atmosphere in the kiln is converted from a weak oxidizing atmosphere to a weak reducing atmosphere, and the oxidation loss of carbon is effectively reduced; the carbon yield is increased; the ash content is reduced; and the product quality is improved. Meanwhile, part of bituminous coal is added, combustible volatile matter is increased, heat and temperature in the kiln can be reasonably controlled by adjusting combustion of the volatile matter, external heat sources are reduced or not needed, and the production cost is reduced. And compared with anthracite, the bituminous coal is lower in cost and higher in cost performance, so that the cost of the coal carburant is further reduced, and the economic benefit is effectively improved.

The invention relates to the technical field of iron and steel smelting, and discloses a method for controlling the carbon content of molten steel in a microwave field by utilizing renewable energy sources, and the method comprises the following steps: mixing powdery biomass charcoal and powdery activated carbon, pressing the mixture into a carburant material block, and wrapping the carburant material block with a steel shell; and the steel sample to be recarburized is subjected to microwave heating to obtain molten steel at the preset temperature, then the recarburizer material block wrapped with the steel shell is added into the molten steel, microwave heating continues, and the finished steel sample is obtained after the reaction is completed. According to the method, the purity of the recarburized molten steel can be improved, the recarburization effect is improved, and the environmental protection property of the recarburization process is improved.

The application discloses a preparation method of wet sand as-cast high-strength high-plasticity nodular cast iron and belongs to the technical field of metal material casting. The method comprises the following steps: S1. raw material smelting: charging pig iron, scrap steel and furnace charge into a furnace, then adding silicon carbide and carbon additive in sections, and after all the raw materials are dissolved into iron liquid, performing slag removal, slag fishing and silicon carbide pretreatment; S2. spheroidizing treatment and inoculation treatment: adding spheroidizing agent into a spheroidizing ladle, covering steel sheet covering agent and silicon-barium-calcium inoculant, adding iron liquid, performing spheroidizing treatment and ladle bottom inoculation, and adding composite inoculant into the iron liquid during ladle pouring; S3. pouring: adding composite inoculant when pouring the iron liquid into a casting mold, and obtaining a product after cooling; the composite inoculant comprises the following components in percentage by weight: Si: 70.0%-80.0%, Sr: 0.05%-0.15%, Ti: 0.2%-0.6%, Nb: 0.1%-0.3%, and the balance is Fe. Through reasonable formula improvement and process improvement, the prepared nodular cast iron has good strength and toughness and good comprehensive performance.

The invention discloses a process for casting grinding balls through horizontal stack box precoated sand shell molds, and relates to the technical field of precoated sand shell mold casting. According to the process, precoated sand shell molds are stacked layer by layer to achieve horizontal pouring, scrap steel, ferrochrome, ferromanganese and a carburant are added into a smelting furnace according to the proportion and smelted to the temperature larger than or equal to 1520 DEG C, 0.4-0.7 Kg of aluminum ingots are added for deoxidation two minutes before discharging after detection is qualified, and the aluminum ingots are added into the smelting furnace to be smelted to the temperature larger than or equal to 1520 DEG C; after slagging-off of the transfer ladle, pouring at 1420-1520 DEG C; by optimizing the shell mold arrangement, the raw material ratio and key process parameters, the product yield is increased to 73.8%-74.2%, the error rate is reduced to 0.18%-0.2%, the mechanical property and the production efficiency are remarkably improved, the process is stable, the application range is wide, and the method is suitable for batch production of various wear-resistant grinding balls.

The present application relates to the technical field of cast iron alloy, and particularly relates to a preparation method of high-carbon-equivalent gray cast iron, which comprises the following steps: taking scrap steel as main material, taking scrap castings, silicon carbide and carbon additive as auxiliary materials, and smelting according to the determined raw material ratio and the value range of carbon equivalent; sampling the molten iron to obtain the first cooling curve of the molten iron, extracting the characteristic points to perform thermal analysis and determine the metallurgical state of the molten iron, adjusting the content of silicon carbide of pre-inoculation or analyzing the possibility of excessive inoculation; pre-inoculating the molten iron, sampling the molten iron again to obtain the second cooling curve of the molten iron, extracting the characteristic points, determining the pearlite morphology, and calculating the sensitivity index of the molten iron to inoculation according to the characteristic point change of the first cooling curve and the second cooling curve. The present application solves the problem that high carbon equivalent easily leads to coarse graphite and performance decline by pre-inoculation adjustment and tapping inoculation.

The disclosed base body is low-carbon martensite / ferrite dual-phase nodular cast iron, which is composed of the following raw material components in percentage by mass: C 3.3% to 3.6%, Si 2.4% to 2.7%, Mn 0.1% to 0.3%, P ≤0.1%, S ≤0.015%, Ni 6.1% to 6.5%, Mg 0.08% to 0.11%, and the balance of Fe, and the structure is 10% spherical graphite, 60% to 70% low-carbon martensite and 20% to 30% ferrite. The preparation method comprises the following steps: weighing scrap steel, ferrosilicon, nickel plate, manganese iron and carbon additive according to the component composition of nodular cast iron, putting the raw materials into a medium-frequency induction furnace to heat and smelt into molten iron; adding spheroidizing agent and inoculant into the molten iron; continuously casting according to the horizontal continuous casting process specification to obtain a casting; putting the casting into a vacuum tube furnace to heat and keep warm, cooling and secondary keeping warm, taking out after furnace cooling and air cooling; then putting into a muffle furnace to keep warm, taking out and quenching to obtain the low-carbon martensite / ferrite dual-phase nodular cast iron with good plasticity and toughness.

The waste heat recycling system comprises a calcining furnace and a pretreatment assembly, the top of the calcining furnace is communicated with a volatile component conveying pipe, the other end of the volatile component conveying pipe is connected with the pretreatment assembly, calcining raw materials in the calcining furnace are calcined to generate a large amount of high-temperature flue gas, and the high-temperature flue gas is used for recycling waste heat in the calcining furnace. The high-temperature flue gas mainly comprises volatile components such as methane, hydrogen and tar, the high-temperature flue gas is conveyed into the pretreatment assembly through the volatile component conveying pipe to be recycled, the high-temperature volatile components are changed into a heat source of the pretreatment procedure from waste, closed-loop gradient utilization of energy in the production system is achieved, and the heat utilization efficiency is high.

The invention discloses a recarburizing and desulfurizing agent used behind an electric furnace and a preparation method thereof, and belongs to the technical field of metallurgy. The recarburizing and desulfurizing agent comprises the following components in percentage by weight: 45-55% of calcium carbonate, 30-40% of coke, 4-8% of oxide scale and 3-7% of binder. The preparation method comprises the following steps: uniformly mixing the components in percentage by weight, rolling, stirring, carrying out compression molding, drying and the like to obtain the recarburizing and desulfurizing agent. The recarburizing and desulfurizing agent is added in the tapping process, so that the deoxidizing and degassing effects in the tapping process are guaranteed, the oxidability of molten steel is further reduced, and the alloy yield is increased; cO2 generated by carbon-oxygen reaction and CO2 generated by decomposition of calcium carbonate are beneficial to denitrification of molten steel, and the liquid nitrogen content of the molten steel is reduced; and in the tapping process, the slag is quickly melted by utilizing the slag washing effect, so that the desulfurization reaction in the tapping process is facilitated.

The invention discloses a method for improving graphite structure uniformity of a nodular iron casting for a wind power casting, and belongs to the technical field of casting. The method for improving the graphite structure uniformity of the nodular iron casting for the wind power casting comprises the following steps: (1) preparing materials: 40-45wt% of pig iron, 30-35wt% of scrap steel and 20-30wt% of foundry returns; (2) pig iron, foundry returns and waste steel are put into a medium-frequency induction furnace to be melted into molten iron, and a carburant, ferrosilicon and a desulfurizing agent are added to conduct component adjustment on the molten iron; (3) a spheroidizing agent, alloy antimony and a nucleating agent are sequentially placed at the bottom of a casting ladle from bottom to top in advance, and molten iron obtained after component adjustment is poured into the casting ladle; (4) the molten iron treated in the step (3) is subjected to slagging-off and then poured into a casting mold, and a stream inoculant is added in the pouring process; and (5) after the pouring is finished, slowly cooling to below 350 DEG C in a casting mold provided with a chilling block, and removing a casting from the casting mold.

The disclosed spherulitic graphite cast iron material with low carbon martensite matrix is composed of the following raw material components in percentage by mass: C: 3.4-3.6%, Si: 2.3-2.6%, Mn: 0.1-0.3%, P: ≤0.1%, S: ≤0.015%, Mg: 0.03-0.05%, and the balance of Fe; the structure is composed of 10-15% by volume of spherulitic graphite + 85-90% by volume of low carbon martensite. The preparation method comprises the following steps: weighing pig iron, ferrosilicon, ferromanganese and carbon additive according to the component composition of the spherulitic graphite cast iron material, melting into molten iron in a medium-frequency induction furnace, pouring into a ladle into which spherulizing agent and inoculant have been added in advance, horizontal continuous casting to obtain a cast piece, selecting a part with high spherulitic graphite density of the cast piece, heat preservation in a vacuum tube furnace, cooling with the furnace, short-time heat preservation in a muffle furnace, taking out, quenching, and obtaining the spherulitic graphite cast iron material with low carbon martensite matrix.

This invention relates to a recarburizing agent capable of improving the carbonization effect of molten steel and its application method. The recarburizing agent is prepared from the following raw materials in the following weight ratio: high-crystallinity graphite: silicon carbide: steel scrap = 7-9:1-2:0-2; wherein the high-crystallinity graphite is prepared by mixing graphite ore and perchloric acid, and the fixed carbon content in the high-crystallinity graphite is 98%-99.95%; the graphite crystallinity of the high-crystallinity graphite is above 85%. The steelmaking recarburizing agent of this invention has excellent effects in improving carbonization conditions, increasing carbonization efficiency, improving carbon recovery rate during converter tapping, and reducing the fluctuation range of carbon recovery rate.

This invention discloses a low-sulfur, low-nitrogen green carbon raiser and its production method, relating to the field of metallurgical materials technology. The carbon raiser is prepared from lignocellulosic waste as raw material through multi-stage gradient pyrolysis, directional catalytic cracking, and inert atmosphere cooling. The method includes: raw material pretreatment; primary low-temperature pyrolysis; secondary medium-temperature pyrolysis; tertiary high-temperature graphitization; directional catalytic cracking; closed-loop tail gas purification and resource recovery; and inert atmosphere cooling and sieving. This invention is low in sulfur and nitrogen, possesses a highly ordered graphite microcrystalline structure, and incorporates [a process involving the introduction of...] CeO2–ZrO2 / γ‑Al2O3 The catalyst selectively cracks C–N / C–S bonds, and is equipped with a closed-loop exhaust gas purification system to achieve near-zero emissions. It has the advantages of high carbon yield, ultra-clean impurity control and green manufacturing throughout the entire life cycle, solving the problems of high sulfur and nitrogen impurities and high carbon emissions in the preparation process of traditional carbon additives.

The invention belongs to the technical field of steelmaking continuous casting refining treatment, and particularly relates to a production method of low-carbon low-silicon aluminum killed steel, which comprises the following steps: 1) steelmaking: controlling the endpoint carbon content of a converter to be below 0.03%, carrying out zero-position bottom argon blowing on the converter for 1-2 minutes after blowing, and tapping; converter boiling tapping is carried out, and no deoxidizing agent is added in the tapping process; 2) refining: boiling molten steel reaches an LF furnace, and oxygen is determined after argon blowing; firstly adding slag charge, and then adding a carburant; heating the electrode and stirring; adding passivated aluminum powder to the surface of the molten steel under the condition of clean argon blowing; and adding a deoxidizing agent for final deoxidation and desulfurization. The method has the advantages that a steel production technology for producing the low-carbon low-silicon-aluminum killed steel through LF direct loading is adopted, molten steel is not subjected to a vacuum decarburization procedure, decarburization and component control are directly completed through the LF furnace, and the equipment investment and the process operation cost are greatly reduced.

The present application relates to the technical field of steel smelting, and particularly relates to a hot analysis carbon control method for gray cast iron. The method comprises the following steps: judging the composition uniformity of the scrap steel to be added and precalculating the purifying material; determining whether to start the hot analysis based on whether the silicon content of the molten iron is in the effective interval, and judging the eutectic undercooling phenomenon by identifying the slope of the cooling curve to calculate the actual carbon content; determining whether to add the carbon additive or the scrap steel and the matching purifying material according to the comparison result of the actual carbon content and the target carbon content; second sampling the molten iron after the regulation and control, and determining whether the regulation and control and the purification are up to the standard according to the carbon content deviation and the impurity residual amount; when the regulation and control and the purification are not up to the standard, inversely calculating the actual absorption rate of the carbon additive, the actual effective carbon content of the scrap steel and the purification efficiency; and respectively optimizing the adding amount of the carbon additive and the scrap steel and the adding amount of the purifying material matched with the scrap steel based on the inverse calculation result. The present application solves the problems of poor timeliness, low precision and complex operation in the carbon content control of the gray cast iron.