74results about How to "Play a role in deoxygenation" patented technology

The invention proposes an environmental-protecting and energy-saving premelting refining slag conditioning agent. The environmental-protecting and energy-saving premelting refining slag conditioning agent comprises the following chemical components in percentage by weight: 20-28% of Al, 29-37% of CaO, 33-41% of Al2O3, MgO not more than 2.5%, SiO2 not more than 2.5%, FeO+MnO not more than 0.7%, S not more than 0.2%, P not more than 0.2%, TiO not more than 0.30%, and H2O not more than 0.7%. The refining slag conditioning agent is premolten beforehand, wherein CaO and Al2O3 are combined to generate a lot of low-melting-point 12CaO-7Al2O3; the melting point of the refining slag conditioning agent is lowered; the slag can be quickly molten at the earlier stage of LF furnace refining; the power supply time is shortened; and the energy is saved; and as aluminum is uniformly distributed in the slag conditioning agent, the earlier deoxidation speed is quicker, and the deoxidation effect is excellent. The refining slag conditioning agent is lower in content of TiO, balances the [Ti] element in molten steel, and has a certain capacity of absorbing the [Ti] element in the molten steel.

The invention discloses a method for welding molybdenum alloy, belonging to the technical field of metal welding. The method comprises the steps: (1) after cleaning, drying the welding area of molybdenum alloy; (2) manufacturing a special welding wire for the molybdenum alloy; (3) degassing at high temperature; (4) taking out a molybdenum alloy workpiece, spraying an active agent until the thickness is 0.2-0.8mm on the he welding area of molybdenum alloy, heating the special welding wire for the molybdenum alloy to dry, and then welding the molybdenum alloy workpiece, wherein the welding method adopts TIG wire filling welding, adopts a direct-current straight polarity power supply and determines welding process parameters; (5) cooling; (6) inspection. The method can reduce the quantity of joint holes, improve weldability, reduce cracks, refine parent crystalline grains so as to improve the tensile property of welded joints, and obtain good welding quality.

The invention relates to an ageing strengthening copper alloy strip. The copper alloy strip is composed of components including, by weight, 0.4%-1.3% of Si, 2%-4.5% of Ni, 0.06%-0.2% of Cr, 0.2%-0.8%of Zn, 0.05%-0.2% of Mg and the balance copper and inevitable trace impurities. Preparing steps include that burdening and smelting are carried out; Mg is added for deoxygenation treatment; when the temperature of a holding furnace reaches the casting temperature being 1220 DEG C-1300 DEG C, and a horizontal continuous casting red ingot casting technology is adopted; face milling, rough rolling and solution treatment are carried out; intermediate rolling is carried out after surface washing; second solid solution is carried out; finished product finish rolling is carried out after surface washing; finished product aging is carried out; surface washing and surface grinding polishing are carried out; and finished stripping, checking and packaging are carried out. The ageing strengthening copper alloy strip has the good processability and casting performance, has the advantages of high strength, high elasticity, high conductivity, excellent resistance to high temperatures and good stressrelaxation resistance and is an ideal material for a lead frame, and the preparing technology is simple.

The invention discloses a high-strength and high-conductivity CuCrZrMg series copper alloy wire. The high-strength and high-conductivity CuCrZrMg series copper alloy wire comprises the following components in percentage by mass: 1.5-15.0% of Cr, 0.1-2.5% of Zr, 0.05-1.0% of Mg and the balance being copper and inevitable impurities. In addition, the invention also discloses a preparation method ofthe high-strength and high-conductivity CuCrZrMg series copper alloy wire. The preparation method comprises the following steps: step one. carrying out fusion casting to obtain an ingot casting; steptwo. carrying out surface treatment and homogenization treatment on the ingot casting; step three. carrying out cold forging to obtain a bar, and then carrying out cold rotary forging to obtain a wire bar; and step four. drawing the wire bar to obtain the wire, and carrying out ageing treatment on the wire. The high-strength and high-conductivity CuCrZrMg series copper alloy wire has the beneficial effects that the wire is reasonable in design of the alloy components, high in alloying degree, appropriate in production cost, controllable in technology and environmentally-friendly and has highalloy strength and high electrical conductivity; and the high tensile strength and the high electrical conductivity can meet the requirements of high current connectors, electric power, machinery andelectronics and the like on high-strength and high-conductivity materials.

The invention relates to the field of pine resin processing and discloses a pine resin processing method with pine resin processing yield increased. The method includes the steps of pre-treatment, dissolution, water washing, clarification, residue recovery, distillation, and finish product collection. In the method, a raw material is pre-treated and is water-washed under supersonic wave; and during the dissolution, an internal heating coil is employed for heating the raw material, zeolite added to break the raw material; and meanwhile, through the residue recovery, vacuum distillation and the like, efficiency of pine resin processing is improved and yield of pine resin is increased. The method is free of big modification on devices and can achieve stable control, thereby achieving stable production and yield increasing.

The invention discloses an automatic slag splashing control method and system for a converter, and belongs to the technical field of converter slag splashing furnace protection. The control method comprises the steps that firstly, final slag conditions are classified according to the end point oxygen content, the end point carbon content and the residual manganese yield range in molten steel; secondly, according to different final slag conditions, slag adjusting materials with the corresponding weights are selectively added into the converter to adjust the viscosity of the slag, and the content of magnesium oxide in the final slag is made to be 10%-15%; and thirdly, corresponding slag splashing gun position curves are selected according to different final slag conditions, and the control system is used for carrying out automatic slag splashing operation. The automatic slag splashing control method and system have the beneficial effects that the slag adjusting materials with corresponding weights are added according to the different final slag conditions for slag adjusting, the corresponding slag splashing gun positions are automatically selected, the automatic slag splashing operation is completed, and the slag splashing operation is standardized. The labor intensity of workers is lowered, the slag splashing time is shortened, the nitrogen consumption is reduced, and the furnace profile can be more stable to maintain.

The invention discloses a manufacturing process of a seamless steel tube top. The seamless steel tube top is manufactured through the steps of wax mould manufacturing, mud mould manufacturing, air drying, roasting and casting, wherein when a mud mould is manufactured, silica sol, quartz sand and rice husks in a mass ratio of 100 to 100 to 50 are added to the mud mould. A ceramic mould obtained after roasting has high strength and good air permeability. The performances of the manufactured seamless steel tube top have superiority compared with the performances of the seamless steel tube tops manufactured by traditional methods. The manufacturing process has the advantages of simple steps, safety, practicability, and the like.

The invention relates to the field of rosin processing, and discloses a processing method for improving the rosin product quality. The processing method comprises the processes of pretreatment, dissolution, water washing, clarification, distillation and finished product segmented recovery; water for production is pretreated; low-oxygen sterile water is used for rosin storage and cleaning; meanwhile, an ultrasonic cleaning process is added for improving the turpentine oil and rosin quality; for the pretreatment, rosin is crushed, and is soaked and flushed by the low-oxygen sterile water; the processing method solves the problems that in the pretreatment process in the prior art, the low-oxygen sterile water quality treatment is complicated, the reagent treatment can cause secondary pollution, and substances such as pigment in the rosin cannot be fully removed in the water washing process of commonly used resin processing; the goals of simply and efficiently treating the low-oxygen sterile water, avoiding secondary pollution and improving the turpentine oil and rosin quality are achieved.

The invention belongs to the technical field of alloy material preparing, and particularly relates to a powder core wire for electric arc spraying and a preparing method of the powder core wire. B powder and Zn powder serve as raw materials for preparing Zn-B alloy powder, Mg powder, Al powder and B powder serve as raw materials, Mg-Al alloy powder is prepared, and after the Al powder, the Zn powder, the Zn-B alloy powder and the B2O3 powder are heated and melted, a Zn-Al alloy belt is prepared through continuous casting, hot rolling, coiling and other procedures and is bent and dried, and then a dry U-shaped groove is prepared through drying; and then, the Zn powder, the Al powder, the Mg-Al alloy powder and the rare earth powder are mixed and dried to be added into the dry U-shaped groove, after the dry U-shaped groove is sealed, the wire is prepared through level-by-level drawing, and then the powder core wire for electric arc spraying is obtained. The obtained wire is high in hardness and good in mechanical performance, reliable wire feeding can be achieved during spraying, long-time stable spraying can be guaranteed, and the coating obtained after spraying has good mechanicalperformance, excellent corrosion resisting performance and high density.

The invention relates to an aluminum alloy smelting process. The aluminum alloy smelting process is characterized by comprising the following steps of S1, preparing an aluminum alloy smelting tool; S2, cleaning a crucible; S3, carrying out aluminum ingot treatment; S4, smelting aluminum ingots; S5, carrying out treatment of a refining agent and a modifying agent; S6, adding the refining agent; S7,adding the modifying agent; S8, sampling and testing; and S9, casting products; and the surface of an appliance is treated before melting, temperature is controlled in the melting process, the refining agent is added in three times and is used as an additive, and a small amount of inert gas generated in the melting process can effectively bring tiny nonmetallic inclusions in a melt body to the liquid surface to easily react with oxygen, hydrogen and the like, so that roles of dehydrogenation, deoxidation, descaling and the like can be realized, and aluminum liquid is purified. In the meltingprocess, the modifying agent is added to promote the nucleation of metal liquid and change the crystal growth process, so that the mechanical property and corrosion resistance of aluminum alloy obtained according to the aluminum alloy smelting process are greatly improved.