279results about How to "Reduce steelmaking costs" patented technology

The invention relates to a manufacture method for preventing edge crack generated during low-carbon cold rolling of paper-thin strip steel, which sequentially comprises the steps: melting, plate blank heating, coarse milling, fine milling, cooling, coiling, acid washing, cold rolling, annealing and finishing and edge cutting, wherein the edge is not cut during steel coil acid washing, and the circular arc-shaped edge is maintained when the steel enters the cold rolling work procedure after the acid washing. The same plate temperature different in the plate blanking heating is lower than or equal to 40 DEG C, and the side pressure amount of the coarse milling is smaller than or equal to 50 mm. The final rolling temperature of the fine rolling is between 880 and 920 DEG C, an auxiliary vertical roller F1E of a machine frame F1 has the side pressure amount of 3 to 10 mm. The cooling is the laminar cooling of fast front section cooling with the cooling speed between 15 and 30 DEG C/s. The coiling temperature is between 650 and 710 DEG C. The single-edge cutting amount during the edge cutting is controlled between 5 and 7 mm, and the double-edge cutting amount is controlled between 10 and 14 mm. The thickness of cold rolling finished products of strip steel is between 0.15 and 0.45 mm, and the pressing rate is between 87.1 and 95 percent. The invention can solve the problem of edge crack of the paper-thin strip steel in the prior art.

Self-reducing, cold-bonded pellets and a method for their production for smelting a great variety of steels, including blast furnace iron-making, non-blast furnace iron-making, and all sorts of steelmaking in steel smelting furnaces, etc. The self-reducing, cold-bonded pellets comprise iron ore concentrate, carbonaceous reducing agent, and finely divided Portland cement clinker with special requirements as binder. The components are combined together to form a mixture. Pellets are produced when the mixture is placed into a balling disc or rotating drum and water is added. Pellets with predetermined size normally ranging from about 8-16 mm are obtained by using roller screens. The pellets are then continuously placed into a curing device. Inside the curing device, the pellets will then be hydrated and carbonated by using hot gases containing carbon dioxide with a temperature range of about 100-300° C. Thereafter, after drying, the dried pellets are discharged from the curing device and will be ready for use.

The invention provides steel-smelting complex deoxidizing agent- calcium-aluminium- ferrum alloy. It is to solve problems of great loss of aluminium during deoxidation process, low effective component content, bad utilization rate and large consumption, easy secondary oxidation and Al2O3 generation. The alloy comprises aluminium 20- 70%, calcium 1- 10% and left is ferrum and inevitable foreign substance. The manganese 1- 20%, silicon 1- 20% and titanium 1- 5% can be added into said alloy to prevent alloy efflorescence and increase steel alloy element. The invention is characterized by high deoxidation efficiency, lowered foreign substance content in steel, smooth steel smelting process, improved steel quality and reduced cost.

The invention discloses an efficient utilization process of aluminum ash in an electrolytic aluminum plant. Limestone powder and graphite carbon are added into white aluminum ash in the electrolytic aluminum plant and pressed to form spheres for the LF refining process; the weight percentage contents of three components are respectively aluminum ash of 60%, limestone powder of 30% and graphite carbon of 10%; limestone and graphite are crushed, are finely grinded in a Raymond mill to reach the particle size below 1 mm, are mixed with the aluminum ash for uniform mixing, and are added in a high-pressure ball press to be pressed to form slag balls; the slag balls are transferred to a converter tapping station for future use; a deoxidizing agent is replaced during LF smelting; 0.8-3 kg of slag balls are added in each ton of steel; and a traditional steel refining process is operated.

The invention discloses a process method for producing steel shots by ladle-casting slag pelletization. The process method comprises the following steps that: a) a ladle nozzle is closed after the steel casting is finished, a ladle is lifted to be above a temperature-rising liquefying device, the ladle is tilted after alignment, and the lade slag is poured into the temperature-rising liquefying device; b) a power supply of the temperature-rising liquefying device is switched-on to heat and increase the temperature, and after the ladle slag is completely molten and the temperature is increased, the temperature-rising liquefying device is tilted to enable the ladle slag to flow out slowly; c) the ladle slag forms stream through a middle flow chute and falls off freely from the front part of a pneumatic pelletizer, the pneumatic pelletizer sprays out high-speed gas flow to crush the ladle slag stream into fine liquid drops, the liquid drops fly along with the gas flow, and simultaneously, a controlled-cooling atomizer distributed below the pneumatic pelletizer sprays out gas-water mixed flow to push liquid drops of the ladle slag to fly continuously and carries out enhanced cooling on the liquid drops of the ladle slag, so that the fine liquid drops are cooled and solidified into steel shots and small slag balls in the flying process, and are prevented from being melted and bonded together after falling to the ground. The method effectively improves the utilization value of the ladle slag.

The invention relates to the technical field of unshaped refractory materials in converter steelmaking and particularly relates to a converter repairing mass and a preparation method thereof. The converter repairing mass is prepared from the following raw materials in parts by weight: 70-110 parts of mixture of fused magnesite and waste magnesia carbon brick particles, 10-30 parts of fused magnesite fine powder, 5-8 parts of bonding agent and 2-5 parts of filler, wherein the mixture of fused magnesite and waste magnesia carbon brick particles at least comprises 10-30 parts of fused magnesite fine powder. The preparation method of the converter repairing mass comprises the following steps of: adding 0.5-1.5 weight parts of wetting agent into the raw materials of the converter repairing mass, and mixing and stirring to obtain loose, dry and uniform aggregate. According to the converter repairing mass and preparation method thereof, the waste magnesia carbon brick serves as a raw material, and the converter lining built by the magnesia carbon bricks realizes a better protection effect; the converter repairing mass has the advantages of good high-temperature fluidity, short sintering time, high sintering strength, long service life, environmental protection and the like.

The invention discloses a steel welding wire of submerged arc welding for X80 pipeline, which is used for submerged arc welding for welding steel with high strength and high toughness for X80 pipeline for transporting petroleum and gas. The welding wire contains following chemical components (by weight percentage): C 0.06 to 0.10%, Mn 1.5 to 1.8%, Si 0.25 to 0.35%, P less than or equal to 0.016%, S less than or equal to 0.005%, Mo 0.3 to 0.4%, Cu less than or equal to 0.08%, Ti 0.1 to 0.2%, B 0.004 to 0.008%, N less than or equal to 0.006%, H less than or equal to 0.003%, and O less than or equal to 0.003%. The welding wire can be used for welding X80 submerged arc welded pipes with high strength and high toughness, and the quality of the welding seam and a heat affected zone can meet the technical requirements of welded steel pipes for petroleum and gas transportation such as high strength, high roughness and low rigidity, and particularly can meet the technical standard requirement for submerged arc welded pipes for two gas pipelines of the worldwide-focused engineering for transporting natural gas from west to east.

The invention relates to a reworked material working lining of a continuous casting tundish and a preparation method for the reworked material working lining. The reworked material working lining is divided into an impact zone working lining and a non-impact zone working lining, which are internally attached to a permanent lining; the non-impact zone working lining sequentially comprises a ladle edge working lining, a ladle wall working lining and a ladle bottom working lining from top to bottom; the impact zone working lining is built by adopting waste magnesia-carbon bricks and regenerated coating material mud through a wet process; the ladle wall working lining and the ladle bottom working lining are built by adopting a regenerated dry material; an overflow port working lining and the lade edge working lining are built by adopting the regenerated coating material; a space between the two sides of a turbulent flow controller and the ladle wall permanent lining is filled by waste; and a regenerated coating material layer coats the outer surfaces of the waste magnesia-carbon bricks, the outer surface of the waste and the upper surface of the turbulent flow controller. By applying the reworked material working lining, the service life of a shaped blank continuous casting tundish reaches 33-38 hours, and refractory material cost of the regenerated material working lining is reduced by more than 60% year on year.

A carburetant for smelting steel is prepared from C (35-57 %), Mn (5-35%), silica sol (0.5-2 %) and carbonate (0.5-2 %) through proportioning, stirring, dia pressing and baking at 105-120 deg.C for 6-8 hrs.

The invention discloses a device and a method used for reducing the exhaust of electric furnace steelmaking dioxin, comprising a bag-typed deduster which is communicated with the electric furnace by a flue gas pipeline and a loading device. The invention is characterized in that the pipeline between the electric furnace and the bag-typed deduster is sequentially communicated with a combustion settlement chamber and a temperature reduction device. The method comprises the steps as follows: the electric furnace adopts the molten iron hot charging technique; the steelmaking flue gas enters the combustion settlement chamber for sufficient combustion, then enters the temperature reduction device, with the temperature reduced from 800 to 1000 DEG C at the inlet to below 200 DEG C at the outlet within 1 to 3 seconds, and is finally exhausted after being disposed by the bag-typed deduster; wherein, the content of the dioxin is not more than 0.2ngTEQ/m<3>. The device and the method of the invention reduce the content of the dioxin, generate a plurality of saturated steam at the same time and have the advantages of saving energy and reducing the steelmaking cost.

The present invention relates to a pure aluminium iron composite deoxidant and its production process. It includes 30-70% of aluminium and 70-30% of iron, and its production process includes the following steps: (1). adopting aluminium-melting furnace to melt high-purity aluminium; (2) pouring the molten aluminium into the mould with frustum form, trapezoidal tower form or triangular tower form and forming, continuously heating the mould and making the molten aluminium be in liquid state; (3). quick adding preheated pure iron granules or iron chipings; and (4) lightly and slowly vibrating mould and making the iron granules or iron chipings uniformly dispersed in molten aluminium, solidifying to form aluminium-iron composition whose specific weight can be up to 2.8 g/cu.cm-6.8 g/cu.cm.

An AlMgFe alloy deoxidant contains Al (40-95 wt.%), Mg (5-20) and Fe (rest). Its advantages are direct application in molten steel, high desulfurizing power and low cost.

The invention provides a method of smelting Ti-IF steel with iron melt containing vanadium titanium. Iron melt containing vanadium titanium is used as a raw material, and Ti-IF steel is obtained afterprocedures of pre-dephosphorization, de-vanadium, and desilication of a vanadium extraction converter, compound injection desulphurization, decarburization and dephosphorization of a steelmaking converter, and RH refining. The method solves the problems that, on the one hand, P content in the iron melt containing vanadium titanium is high, dephosphorizing by single converter smelting is difficult, and phosphorus content at the end point of the iron melt is high; and on the other hand, heat in the iron melt containing vanadium titanium is insufficient, the LF heating procedure is omitted by adopting the method of heat compensation, and nitrogen content in steel rising and procedure energy consumption in the LF heating process can be avoided. The quality of Ti-IF steel is improved, contentof T[O] in the steel is controlled to be reduced below 0.0020%, technology procedure is shortened, production efficiency is improved, and production procedure energy consumption is reduced.

The invention discloses an oil sleeve steel ball. The oil sleeve steel ball consists of the following components by weight percent: 0.28-0.36% of C, 0.17-0.32% of Si, 1.10-1.60% of Mn, less than or equal to 0.02% of P, less than or equal to 0.2% of S, less than or equal to 0.2% of Cu, less than or equal to 0.2% of Ni, less than or equal to 0.25% of Cr, less than or equal to 0.1% of Mo, less than or equal to 0.08% of V, 0.008-0.03% of Al, less than or equal to 0.15% of other elements and the balance of Fe. The manufacturing process comprises the steps of converter smelting, external refining, continuous casting of a round billet, hot rolling of seamless pipes and heat treatment of an oil sleeve pipe. 0.008-0.030% of Al is specially added in the oil sleeve steel ball for refining grains, the toughness of steel pipes is improved, and the requirement that the steel for oil sleeves by API5CT is fine-grain killed steel. The steel ball is low in steel-making cost and easy in process control, and multi-steel-grade oil sleeves of J55, M65, N80Q, L80-1, R95 and P110 with wide intensity range can be produced by a proper process, so that the marks of steel for oil sleeves can be reduced, so that the oil sleeve steel ball is economical and practical, on one hand, the management of blanks and production are facilitated, on the other hand, stocks are reduced, and overstocked funds are lowered.

The invention relates to a calcium carbide ferro-aluminium alloy used for smelting steel, and a preparation method thereof. The calcium carbide ferro-aluminium alloy employs calcium carbide, aluminium, ferrum and the like as raw materials, is produced by a remelting perrin process, and is used for deoxidation and desulphurization of smelting the steel. The calcium carbide ferro-aluminium alloy comprises the following components of, by mass, 20-60% of aluminium, 5-40% of calcium, 1-15% of carbon, and the balance being ferrum and inevitable impurities. The calcium carbide ferro-aluminium alloy has good effects of deoxidation and desulphurization, and can reduce cost for smelting the steel while guaranteeing the quality of the steel.

The invention discloses a method for smelting medium-high alloy low-phosphorous steel through an electric furnace with a high molten iron proportion. Through strictly control over oxygen blowing, power transmission and feeding processes during smelting of the electric furnace, the purposes of efficient smelting, energy saving and consumption reducing are achieved. The method includes the detailed steps that the proportion of molten iron entering the furnace is controlled to be 60-80%, steel scraps are added into the furnace at a time through a basket, the molten iron enters from a door of the furnace through a molten iron adding trolley during power transmission, the flow of a multifunctional bundling oxygen lance is reasonably adjusted, power supply time is dynamically controlled, lime is supplemented into the furnace in batches in combination with an automatic feeding system, and therefore molten steel rapidly meets the requirements for components and temperature needed by a steel grade. Compared with a common electric furnace technology, the time consumed for adding the molten iron is shortened, and the smelting efficiency of the electric furnace is improved; the power supply time of the electric furnace is quite short, and therefore the energy consumption of steel smelting is lowered; during smelting of the electric furnace, efficient dephosphorizing and decarbonizing are achieved.