90results about How to "Avoid oxidation burn" patented technology

A design and control method for the optimizing control system of intermediate rolling mill and heating furnace in order to improve the heating quality of billet in the heating furnace and save energy features that the heating furnace and intermediate rolling mill constitute a closed loop system, the information (rolling force, temp, etc) is fed back to heating furnace for dynamically changing the heating temp, and the optimizing control strategy and control algorithm are used in the billet heating process.

The invention discloses a magnesium alloy refiner and a preparation method thereof, and relates to a grain refiner and a preparation method thereof. The method solves the problems that an overheating treatment method of the existing magnesium alloy refining method has strict condition requirement, the oxidation burning loss of magnesium is serous, a carbon-containing material treatment method has high temperature and produces harmful gases such as Cl2, HCl and the like, a ferric chloride method reduces the corrosion resistance of the magnesium alloy, an alloying method has high cost, a granular graphite or aluminium carbide granule method is easy to produce segregation on the grain boundary and a Zr element method has narrow application range. The magnesium alloy refiner is prepared from a calcium metal and a primary magnesium ingot. The preparation method comprises the following steps: heating and melting the primary magnesium ingot under atmospheric protection, then adding the calcium metal into the melted primary magnesium ingot, dissolving the calcium metal and stirring the mixture uniformly, and casting the mixture to form the magnesium alloy refiner. The magnesium alloy refiner has no burning loss, does not produce the harmful gases, has no influence on the corrosion resistance of the magnesium alloy, has low cost, is uniformly distributed in the alloy, can improve the mechanical property of the alloy, and is used for refining the magnesium alloy.

The invention discloses an electroslag remelting process for titanium alloy steel, which comprises the following steps of: (1) preparing consumable electrodes; (2) preparing electroslag; (3) forming slag through electroslag; (4) remelting electroslag. The step (3) of slag formation comprises the following procedures of: firstly, adding one third of total slag material into a crystallizer to form slag, mixing a right amount of mixture including Al powder and FeTi powder into the rest residue material, and adding the rest residue material with the mixture into the crystallizer to form slag. Theelectroslag remelting process for titanium alloy steel does not need special slag purification process, the investment to slag purification equipment is reduced, the technological flow is shortened, and the production cost is greatly lowered. By adding the mixture of Al powder, FeTi powder and CaF2 powder into a slag pool in the process, oxygen generated by unstable oxides in the molten slag can be prevented from entering the slap pool and a molten pool to oxidize elements in steel, and the massive uncertain oxidation burning of Ti element in steel is avoided. Therefore, the content of Ti element in the titanium alloy steel obtained by the process can accurately reach the standard requirement, and the quality of the titanium alloy steel is ensured.

The invention relates to a preparation technology for an alloy mast, wherein the alloy is made from chromium, zirconium and copper. The technology comprises the following steps: adding industrial electrolytic copper into an inductive melting furnace for heating and melting, and covering the surface with graphite powder and charcoal at the same time; starting an electromagnetic stirrer for electromagnetic stirring and aided deoxidation treatment; adding a copper-chromium master alloy and zirconium wires for heating and melting after the industrial electrolytic copper is completely melted, and enabling the melt composition to be uniform by utilizing the electromagnetic stirring; then moving up the baffle between the inductive melting furnace and an inductive holding furnace so that the melt in the inductive melting furnace can be transferred into the inductive holding furnace under the action of the gravity, and covering the melt surface with the graphite powder and the charcoal; adjusting the melt temperature to 1200 DEG C to 1250 DEG C; and then starting an up-pulling system and continuously up-pulling CuCrZr alloy masts, and continuously adding new furnace burdens into the melting furnace during the up-pulling process. Under a non-vacuum condition, the technology can prepare the alloy (containing chromium, zirconium and copper) mast which is easily oxidized and difficult in adding element zirconium by utilizing the electromagnetic stirring function and through the tight coverage of a covering agent, and the technology is very simple.

The invention provides a high-temperature alloy which comprises the components such as C, Cr, Ni, Mo, Mn, Si, Nb, RE, N, Ti, B, Zr and the like, wherein the optimal content of each component is selected after reasonable analysis and repeated tests so that the components of the alloy realize the best interaction effect; and the tests prove that the high-temperature alloy provided by the invention is obviously superior to 25-20 steel and 316 steel in terms of average hardness, high-temperature oxidation resistance, high-temperature corrosion resistance and high-temperature washout resistance, and has good high-temperature comprehensive performance.

The invention discloses a method for producing an aluminum alloy ingot. A smelting furnace is preheated before being used, reaction time can be shortened, and the phenomenon that materials do not fully react can be avoided; a powdery dreg remover is scattered into the surface of melt, Al2O3 included slag brought from an electrolytic cell can be preliminarily removed, and furnace wall hanging slag can be reduced; coating painting treatment is carried out through a launder, and it is ensured that a launder lining is completely dry before the launder is used; a gas refining system in a heat preservation furnace is started, H2 and oxide inclusions in the aluminum melt can be fully removed, and meanwhile impurities Na can be removed well; and the launder, a sprue, the lining, a coating and seams are inspected while pretreatment so as to guarantee that molten aluminum can be injected into the heat preservation furnace fast and stably.

This invention relates to nanoscale silicate anti-oxidation coating for steel billet annealing. The coating is composed of: composite binder 20-30 wt.%, composite phosphate curing agent 8-12 wt.%, and composite aluminosilicate filler 58-72 wt.%. The coating can resist 1500 deg.C high temperature. The coating does not need any surface treatment, and can be directly sprayed onto the surface of steel billet, and cured at normal temperature for 10 min. Before annealed and hot-rolled, the coated steel billet is water-quenched for several seconds so that the coating layer is removed without any trace, and the surface quality is improved. The coating can reduce the loss-on-ignition of various steels, thus can be used for surface protection of refractory materials used as furnace kiln lining. Besides, the coating can also be used as inner and outer wall coating, and metal surface (bridge, bridge pier and dam) coating with water, corrosion and oxidation resistance.

The invention relates to a monitoring method of the heating time and the heating temperature of a heating furnace on a hot rolling production line, and belongs to the field of automation of the metallurgical hot rolling production line. According to the technical scheme, the method comprises the following steps: reading steel billet ID (Identification) signals sent to PLC (Programmable Logic Controllers) at the first stage in the heating furnace continuously; establishing a tracking of steel billets in the furnace by tracking the positions of the steel billets on a roller bed outside the furnace; reading the position of each steel billet in the heating furnace every three minutes from a secondary database of the heating furnace and accumulating the reading results; calculating the heating time of the steel billets at each stage in the heating furnace; contrasting the heating time with a technological requirement and alarming if the heating time exceeds the time specified by the technological requirement; storing the PLC address of each thermocouple in the heating furnace in the secondary computer database of the heating furnace; reading an average value of the temperature at each stage in the heating furnace; and finally, contrasting the heating temperature with the technological requirement and alarming if the heating temperature exceeds the temperature specified by the technological requirement. With the adoption of the method provided by the invention, the occurrence of inferior-quality products caused by an incomplete phosphorus removal on the surface of strip steel due to the long heating time and the high heating temperature at each stage in the heating furnace is avoided; the oxidation burning loss rate is decreased; the yield is increased; the cost of the steel per ton is reduced; and therefore the economic benefit is improved.

The invention discloses a NiCrNb-Re high-temperature-resistance and corrosion-resistance welding wire for ethylene cracking furnace cast pipes and a preparation method thereof, and belongs to the field of welding materials. The welding wire comprises the following components in percentage by weight: 45-50% of Ni, 35-40% of Cr, 1.00-1.50% of Nb, 0.01-0.10% of Re, 0.30-0.55% of C, 0.50-2.00% of Si,1.00-2.00% of Mn, 0.01-0.10% of Al, 0.05-0.20% of Ti, 0.01-0.10% of Zr, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of alloy smelting-electroslag remelting-blooming by hot forging-hot-rolled annealing-mechanical stripping-diameter reduction by drawing-straightening and cutting or precise layer winding. The preparation method is environmentally friendly, free of acid washing pollution, stable in welding arc, free of splashing, beautiful in welding line molding, excellent in welding process and mechanical performance and dense in welding line structure, and can totally meet high-temperature-resistance and corrosion-resistance welding requirements of the ethylene cracking furnace cast pipes.

The invention discloses a preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and a device thereof; the high-purity aluminum and calcium are used as the raw material and are prepared according to the weight percent as follows: 70-90 percent of aluminum and 10-30 percent calcium; the calcium is added to the aluminum which is molten by a low-frequency sensing induction furnace, the aluminum and the calcium are molten for 30-40 minutes under the protection of argon gas and then cast into an ingot; after being cooled, the ingot is broken into blocks to prepare the aluminum-calcium alloy. The invention has the advantages that the alloy has high purity and high calcium content and is used for vacuum refining molten steel deoxidation; the deoxidation and calcium can be completed in one step; the O, C, N, S ingredients in the steel are ensured not to exceed the standard requirement; meanwhile, the Al2O3 inclusion content in the steel is greatly reduced, thereby having the obvious effects of reducing nodulation at a pouring water gap and improving steel quality.

The invention belongs to the technical field of metallurgy and particularly relates to an aluminum iron alloy with ultra-low carbon, ultra-low titanium and high silicon contents for deoxidizing aluminum silicon killed steel and a manufacturing method of the aluminum iron alloy. The alloy contains aluminum, iron, silicon and impurities, and is characterized in that the alloy comprises the following components by weight percentage: 20%-30% of aluminum, 45%-55% of silicon, 22%-28% of iron and the balance of impurities. The impurities comprise the components by weight percentage: less than 0.008% of carbon, less than 0.02% of phosphorus, less than 0.02% of sulfur, less than 0.05% of copper, less than 0.005% of titanium, less than 1.0% of manganese and less than 0.05% of nitrogen. The manufacturing method comprises the steps of burdening, melting and casting. The alloy has the advantages of ultra-low titanium content, ultra-low carbon content, low impurity content and the like, and particularly meets the requirement of the aluminum iron killed steel on the ultra-low titanium and ultra-low carbon contents of a deoxidier.

The invention discloses a boron-containing alloy smelting process with high yield. The process is characterized in that firstly boron-containing alloy is smelted in an electric furnace, when the temperature of the alloy is 180-230 DEG C higher than liquidus temperature, 0.2-0.5 % of calcium-silicon is added for preliminary deoxygenation, then 0.12-0.18% of aluminium is added for final deoxygenation, and then 0.2-0.3% of ferrotitanium is added for fixing nitrogen in metal solution, and finally ferrotitanium and ferroboron tightly wrapped by an aluminium plate are added into metal liquid together, when the temperature of boron-containing alloy is 200-260 DEG C higher than the liquidus temperature, boron-containing alloy liquid is discharged and can be used for pouring of cast or cast ingot. The invention is adopted to smelt boron-containing alloy, yield of boron element is over 90%, consumption of boron element can be obviously reduced, and boron-containing alloy production cost can be reduced, thus the invention has better economic and social benefits.

The invention relates to an adding method of additives of electroslag remelting alloy tool and die steel and the method comprises the following steps: (1) the additives are packed up by using metal pipes and rolled into metal cored-wire; and (2) the metal cored-wire is directly hung in a consumable electrode steel mould. The adding method can avoid the oxidation loss of active modification elements caused by steel slag mixing and molten slag oxidation, the yielding rate is high (over 30 percent) and the modification effect of steel is good.

The invention discloses a carbon fiber with a C-Si-Al coating on the surface for gradient sintering protection of a precursor as well as a preparation method and application thereof. The C-Si-Al coating for gradient sintering protection of the precursor is designed and constructed on the surface of the carbon fiber (CF) with certain thickness and morphology by adopting the magnetron sputtering method; the C layer serves as the innermost layer to protect the CF and reduce the damage to the CF during the sputtering process; the Si layer serves as a transition layer to play the action of blockingand prevent the CF and the Al layer from being in contact reaction to form the brittle phase of Al4C3; the Al layer serves as a precursor coating for subsequent anodic oxidation of nanoporous Al2O3;and the gradient C-Si-Al coating is enabled to be dense and homogeneous in structure by heat treatment after sputtering. The C-Si-Al coating prepared by the invention has high strength in bonding withthe CF substrate and good stability in long-term implantation, and can prevent the coating from falling off and getting failed, thereby laying a certain research foundation for the application of C-Si-Al/CF in clinic.

The invention discloses a high-strength and high-conductivity refining agent for smelting a chromium-zirconium-copper alloy. The refining agent comprises a covering component and a purifying component, wherein the purifying component comprises calcium hexaboride, fluorotitanate, fluoborate, chlorine metal salt and rare earth. The invention further discloses an application method for the high-strength and high-conductivity refining agent for smelting the chromium-zirconium-copper alloy. According to the refining agent and the application method thereof, the cooperation function of the covering component and the purifying component is adopted so that the good impurity removal and purification effect on chromium-zirconium-copper alloy melt can be achieved, in addition, the oxidation burning loss in the smelting process can be effectively avoided, and therefore the strength and the conductivity of the material can be improved, and no pollution can be caused to the copper alloy melt.

The invention relates to the field of copper alloys for the bathroom and kitchen industry and provides a preparing method for an anti-dezincification leadless bismuth arsenic extruded brass rod. The preparing method comprises the step of smelting 61-63% of Cu, 0.5-0.9% of Bi, 0.07-0.12% of As, 0.5-0.8% of Al, 0.08-0.24% of Sn, smaller than 0.1% of Pb, the balance Zn and smaller than or equal to 0.25% of impurities to obtain the solid brass rod by the processes of lead casting and extruding.

The invention relates to the field of copper alloys for kitchenware industries, and provides a production method of an anti-dezincification and unleaded lead-cast brass ingot which is good in anti-dezincification corrosion property, high in strength, and good in machining property. The production method comprises the steps that the following raw materials of, by mass, 61-63% of Cu, 0.5-0.9% of Bi,0.07-0.12% of As, 0.5-0.8% of Al, 0.08-0.24% of Sn, less than 0.1% of Pb and the balance Zn and impurities with the total amount being less than or equal to 0.25% are smelted, and then subjected to lead casting, and the brass ingot is prepared.

The invention discloses an ultra-pure smelting process for low-carbon ultra-low-titanium high-strength steel. The ultra-pure smelting process comprises the following steps: controlling the oxygen content of an electroslag metal molten pool, controlling the oxygen content of a primary electrode, adding a certain amount of aluminum element of which the activity is higher than that of titanium into the electrode, adding a certain amount of titanium dioxide powder into the rear half section of the electroslag remelting process, and the like. It is ensured that the titanium content after electroslag remelting reaches the technical standard and is uniformly distributed. The ultra-pure smelting process has the implementation effects that aluminum is burnt and titanium is protected in the electroslag remelting process, the titanium content deviation at the head and the tail of an electroslag ingot is +/-0.02%, the overall titanium content of the steel ingot is uniformly distributed, and the strength and toughness matching of the steel is ensured. The ultra-pure smelting process has greater engineering application value for component control of the alloy structural steel with ultra-low content of active alloy elements narrow in component control.