37results about How to "Homogenization of ingredients" patented technology

The invention discloses an electromagnetic excited TIG arc melting-brazing hybrid welding method and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of a welding arc, and the assistant effect on the melting bath of the liquid-state brazing filler metal for arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

The invention provides laser cladding alloy powder for repairing and remanufacturing a hot-working die. In order to solve the problem that nickel-based or cobalt-based thermal spraying powder is expensive, iron-based alloy powder is adopted in the invention. While the iron-based alloy is formed through replacing pure iron with waste steel, the reutilization of the waste is realized. However, as the impurity content in the waste steel is high, the removal of phosphorous, carbon and sulphur is required in the refining process so as to obtain molten steel of which the components and temperature are qualified. The traditional method usually removes the impurities through slagging in the form of furnace slag, but has the problems of high heat energy requirement, large metal losses and serious splashing. In order to solve the problems, a traditional slag former is replaced by yttrium oxide, and waste steel impurities and glomeration inclusions are removed through the purifying functions of rare-earth elements. Meanwhile, deposited metal is endowed with excellent anti-fatigue performance.

The invention relates to a sulfate reducing bacteria corrosion-resistant oil well pipe and a production method thereof. The sulfate reducing bacteria corrosion-resistant oil well pipe consists of the following chemical components in percentage by weight: 0.12 percent or less of C; 0.15 to 0.45 percent of Si; 0.7 percent or less of Mn; 8.5 to 25 percent of Cr; 0.15 to 2.5 percent of Cu; 0.5 to 3.5 percent of Al; and the balance of Fe and inevitable impurities. The production method for the sulfate reducing bacteria corrosion-resistant oil well pipe includes the following steps: the chemical components are smelted and continuously cast into a round billet or cast into a square billet which is then rolled into a round billet; after hot rolling, a seamless steel pipe is produced; high-temperature solution heat treatment is carried out, the heating temperature is 950 DEG C to 1200 DEG C, and the temperature-keeping time is 30 to 120 minutes; the tempering temperature is 650 DEG C to 750 DEG C, and the tempering temperature-keeping time is 60 to 90 minutes; sizing and straightening are carried out, the hot straightening temperature is higher than 450 DEG C, and therefore the oil well pipe is produced. The oil well pipe produced by the method can effectively resist SRB (sulfate reducing bacteria) corrosion in external environment, moreover, the yield strength of the oil well pipe is greater than 380MPa, thus meeting the requirement of J55 steel grade, and better meeting the requirements of production strings for water injection wells under harsh environment.

The invention discloses a method and a device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials. In the process of performing arc welding-braze welding on the dissimilar metal material, a brazed liquid solder molten pool is subjected to the reinforced booster action of electromagnetic stirring and electric magnetization by using the characteristic that a magnet exciting coil generates an external applied alternating magnetic field in a welding area to control a welding arc so as to promote ordered flow of the liquid solder, and rupture of membranes, wetting, spreading and diffusion of the liquid solder on the surface of the metal material with a higher melting point, promote the liquid solder and a base metal which is molten by the metal material with a lower melting point to be mixed fully, improve uniformity of compositions of a soldered seam, reduce the weld defects, optimize the compositions and the performance of the soldered seam, and improve the soldered joint; and the device has the advantages of simple structure, flexible application, lower cost, good effect, and easy implementation.

The invention discloses compound smelting equipment ultrasonically stirring low-melting-point alloy, which is applicable for the smelting and preparation of the low-melting-point alloy, in particular to various tin-bismuth series alloy at the low melting point of below 300 DEG C. The equipment comprises a crucible, a heat-preservation and heating device, a temperature control device, an ultrasonic stirring device, an ultrasonic wave generation and control device and a mechanical stirring device, wherein molten metal is put in the crucible. The equipment is simple in structure and practical; the mechanical stirring device and the ultrasonic stirring device are mutually perpendicular without intervention; ultrasonic waves are imported to the molten metal from the side of the crucible; the efficiency is high, the ultrasonic energy loss is low, and moreover, the solid rate of the molten metal is higher; even when metal stirring fails, the ultrasonic waves still can be applied till metal solidification; through the compound ultrasonic and mechanical stirring, grains can be refined, so that a non-dendritic structure is obtained; homogenizing of the ingredients and the temperature of the fused molten metal is sped up; the plasticity of prepared alloy is improved greatly in comparison with the plasticity of alloy prepared by a traditional method.

The invention discloses a method for controlling the internal quality of a 37Mn circular tube steel casting blank with a phi-280mm production section, and belongs to the field of metallurgy. The method comprises the steps such as smelting in a converter, molten steel refining in an LF furnace, RH vacuum treatment and continuous casting of molten steel. First of all, the purity of the molten steel is improved according to reasonable parameter control in the molten steel smelting stage, and the high-temperature plasticity of the molten steel is improved and the steel grade crack sensitivity is lowered after the molten steel is subjected to titanium microalloying; and then, mold electromagnetic stirring and final electromagnetic stirring are combined in the molten steel pouring stage, so that component and temperature homogenization of the molten steel can be achieved, the shell of the circular tube steel casting blank can grow uniformly, the solidification structure of the circular tube steel casting blank can be effectively improved, the loose level can be raised, the area of an equiaxial crystal region can be enlarged, the compactness of the central region of the circular tube steel casting blank can be effectively improved, the crack defect of the circular tube steel casting blank can be effectively controlled, the surface non-clearing rate can be improved, and the quality of such a rolled product can be controlled well and stably.

The invention discloses a preparation method of a high-toughness wear-resistant steel casting. The preparation method comprises the following steps: raw materials are added to a smelting furnace, a smelting additive, which comprises sodium borate, sodium fluosilicate, sodium carbonate, sodium chloride, rare earth carbonate, lithium oxide and titanium dioxide, is added, an inert gas mixture of an argon gas and a helium gas is supplied, and matrix alloy liquid is obtained; the component contents of the matrix alloy liquid are detected, and the components comprise C, Si, Cr, Mn, Mo, B, Al, V, Zr, Nb, S, P, the balance Fe and unavoidable impurities; a modificator, which comprises silicon carbide, boron nitride, tungsten oxide, silicon dioxide, molybdenum metal and magnesium metal, is added to the matrix alloy liquid, and a cast steel blank is obtained by casting; and the cast steel blank is subjected to heat treatment, and the high-toughness wear-resistant steel casting is obtained. The steel casting obtained by the preparation method has good wear resistance, the hardness can reach above 70HRC, and the impact toughness can reach 15J/cm<2>.

The invention provides an electrolysis device and method. The electrolysis device comprises an electrolysis tank, at least one cathode in the electrolysis tank, multiple anodes arranged around the cathode in intervals and multiple air blowing pipes symmetrically arranged on the inner wall of the electrolysis tank, wherein bottom outlets of the air blowing pipes stretch out of the bottom surface of the electrolysis tank and are arranged along a horizontal direction. An electrolyte at the bottom of the electrolysis tank is stirred through gas and a gas outlet direction and a cathode center direction form an a certain angle in air blowing so that the electrolyte on the bottom produces eddy currents along a horizontal direction and the electrolyte in all zones in the electrolysis tank can circularly flow and thus heat transfer and mass transfer in the electrolysis tank are improved, inner temperatures and components are uniformed, product quality is improved and furnace conditions are improved.

The invention provides a dispersion strengthened material used for a platinum-based vessel. The dispersion strengthened material comprises a substrate and a strengthening phase dispersed in the substrate, wherein the substrate is platinum and the strengthening phase element is any one or more of zirconium, scandium and cerium. The zirconium content is more than 0 and no more than 0.4 wt%, the scandium content is in a range of 0-0.4 wt%, and the cerium content is in a range of 0-0.4 wt%, with the balance being platinum, wherein the total content of zirconium and scandium and cerium is less than0.6 wt%. The strengthening phase element is dispersed in the substrate in an oxide form to form a dispersion strengthened material. The dispersion strengthened material is good in scouring resistance, corrosion resistance and high-temperature creep resistance. A vessel prepared from the material is long in service life. The production cost in the technical fields, such as optical glass and glassfiber, can be efficiently reduced.

The invention discloses a center porosity control method for 35CrMo round steel casting blooms with cross section diameter being 280 mm. The method comprises the following steps: converter smelting, LF molten steel refining, RH refining and continuous casting of molten steel, and is characterized in that crystallizer electromagnetic stirring and solidification end electromagnetic stirring are combined in the continuous casting step. The method has the benefits that first, in the molten steel smelting step, control is carried out according to reasonable parameters, so as to improve the impurity of molten steel and ensure that the discharging conditions of the molten steel are optimal; and then, in the molten steel casting step, crystallizer electromagnetic stirring and solidification end electromagnetic stirring are combined to ensure that molten steel ingredients and temperature are homogenized, a blank shell grows uniformly, and columnar crystal structures are consistently scoured and fused in the stirring process, so that the areas of center porosity in the casting blooms are reduced, and the density is improved.

The invention provides a method for preparing a laminated material with a grain gradient by using induction normalizing, comprising the following steps: using induction heating to partially normalize the surface of the steel plate, keeping it warm, and air cooling to room temperature to obtain a steel plate; Heating to the recrystallization zone, and then rolling the steel plate, each time the rolling pressure is 0.7-1.2mm, and the total pressure is 60-90%, to obtain the final rolled steel plate; the final rolled steel plate is recrystallized as a whole Annealing heat treatment, the temperature is 30-50°C above Ac3 or Acm, heat preservation, cooling with the furnace, to obtain laminated materials. The invention utilizes the method of induction heating, adopts appropriate heating process parameters, and sequentially induces normalizing treatment on the front and back sides of the steel plate, and then undergoes rolling treatment and recrystallization annealing, and realizes the high-strength plastic product without relying on alloying. The laminated material with grain gradient solves the problems of high cost, complicated equipment and difficult organization regulation in the prior art.