223 results about "Melting rate" patented technology

A method of producing a nickel base alloy includes casting the alloy within a casting mold and subsequently annealing and overaging the ingot at at least 1200° F. (649° C.) for at least 10 hours. The ingot is electroslag remeelted at a melt rate of at least 8 lbs/min (3.63 kg/mm.), and the ESR ingot is then transferred to a heating furnace within 4 hours of complete solidification and is subjected to a novel post-ESR heat treatment. A suitable VAR electrode is provided form the ESR ingot, and the electrode is vacuum arc remelted at a melt rate of 8 to 11 lbs/minute (3.63 to 5.00 kg/minute) to provide a VAR ingot. The method allows premium quality VAR ingots having diameters greater than 30 inches (762 mm) to be prepared from Alloy 718 and other nickel base superalloys subject to significant segregation on casting.

An EP output voltage to be outputted during a period of EP polarity is set so that a welding current becomes equal to or lower than a critical current level, and an EN output voltage to be outputted during a period of EN polarity is set at a level lower than the EP output voltage. This makes it possible to substantially equalize a wire melting rate in the period of EN polarity and that in the period of EP polarity with each other. Even at such a short arc length as causing frequent short circuiting, gas-shielded AC arc welding making use of a consumable wire can be still performed stably so that high wire melting rate, shallow penetration, convex weld reinforcement and the like, which are characteristic features of AC welding, can each be set selectively at a desired level or in a desired shape depending on the application.

The present invention relates to a pellet type SBS-asphalt master batch modifier composition comprising styrene-butadiene-styrene (SBS) block copolymer and asphalt, and modified asphalt prepared by melting and mixing the pellet type SBS-asphalt master batch modifier composition with asphalt. The modified asphalt prepared thereof has advantages that deterioration of physical properties and thermal oxidation can be prevented while productivity can be improved due to reduced melting time of modifier.

The invention discloses a method capable of improving the quality of a large-section peritectic steel continuous casting billet. The method comprises control over the following processing steps that (1) the chemical ingredients of low-alloy peritectic steel are optimized; (2), after VD treatment, a fed calcium line is controlled to perform final deoxidation and inclusion modification treatment, and soft blowing is performed before casting; (3), full package operation is adopted for a tundish, the tonnage is controlled, and low-liquid-level casting is avoided; (4), the superheat degree of the tundish is controlled in the continuous-casting throwing process, and meanwhile the temperature difference of molten steel between two furnaces is controlled; (5), the fed-water temperature of a crystallizer and the temperature difference between fed water and discharged water are controlled, meanwhile, the narrow edge taper of the crystallizer is increased, and the shrinkage quantity of the peritectic steel is compensated; (6), casting powder special for the peritectic steel is selected, wherein the casting powder is high in alkalinity, low in viscosity and high in melting rate; (7), after thecontinuous casting billet is controlled to enter a secondary cooling zone by 12 meters, electromagnetic stirring is applied, and meanwhile the secondary cooling water amount is lowered. The surface quality and the internal quality of the large-section peritectic steel continuous casting billet cast through the method are both improved to a great extent.

The invention discloses a process and equipment used for preparing a high-purity spherical titanium and titanium alloy powder material. The equipment comprises an electrode vertical conveying device 1, a vacuum induction melting device 2, a gas atomizer 3 and an atomizing tower 4, and is characterized in that the vertical displacement and the rotating speed of titanium and titanium alloy electrode bars entering a vacuum induction melting furnace are precisely controlled by the electrode vertical conveying device; the titanium and the titanium alloy electrode bars are molten into liquid in the induction furnace under a non-crucible contact state; the melting rate of the titanium and titanium alloy electrode bars can be adjusted through controlling the displacement speed of the titanium and titanium alloy electrode bars entering the melting furnace and the heating temperature in the induction furnace; when the metal liquid passes through a gas confluence focus of the high-pressure inert gas atomizer, a titanium and titanium alloy liquid phase flow is crushed into a superfine fogdrop state; under the effect of surface tension, liquid drops settle, cool and form the spherical superfine powder material in the atomizing tower and are separated and collected by a filter; the titanium and titanium alloy powder materials with different granularities and size distribution can be obtained through controlling atomizing gas pressure and flow. By using the process and the equipment, high-purity spherical magnesium, aluminum, nickel, chromium, tungsten, molybdenum and corresponding alloy powder and ceramic powder can be prepared.

The invention discloses an ultrahigh-alkalinity crystallizer mould flux special for high-pulling-rate peritectic steel. 38%-42% of CaO, 25%-29% of SiO2 and 7%-10% of F- are adopted to improve the crystallization capacity of the mould flux, reduce stress concentration and improve lubrication; 2%-5% of MgO and 2%-5% of Al2O3 are adopted to improve the fluidity of a flux film and reduce cracks; an excellent heat transfer coordination and heat transfer control effect is achieved by adopting the mould flux with the alkalinity ranging from 1.35 to 1.52, 25%-29% of SiO2, 2%-5% of Al2O3 and 2%-5% of MgO; the effects of effectively controlling the melting rate to guarantee melt flux feeding and preventing subsurface blowholes can be achieved with the carbon proportioning range of 4%-7%. Raw materials for preparing the ultrahigh-alkalinity crystallizer mould flux can be easily obtained, the flux consumption ranges from 0.32 kg per ton of steel to 0.38 kg per ton of steel, and cost of per ton of steel is low; on-spot practical application indicates that the mould flux can be well spread in a crystallizer and be evenly and stably melt and is high in casting percent of pass.

Copper alloy electroslag remelting process belongs to field of copper alloy production technology. Electroslag remelting chooses slag system whose melting point is lower 100-200degC than copper alloy, slag is thorough dry before remelting; electroslag remelting can take place under the protection of dry nitrogen gas. In the process of electroslag remelting add metal aluminium, metal RE, zirconium iron, carbon powder, calcium carbide, or magnesium alloy as deoxidizer continuously or interruptedly, add remelting metal 0.3-1.5Kg in one ton. In the process of electroslag remelting take out of ingot to produce electroslag ingot, by blowing or spraying take the second cooling. If it do not take the second cooling,electroslag remelting melting rate(Kg/h)=(1.0-1.5)*crystallizer diameter(mm). If it take the second cooling, electroslag remelting melting rate(Kg/h)=(1.5-3.0)*crystallizer diameter(mm). The designing height of taking out of ingot crystallizer is 1.2-2.0 times as crystallizer diameter, taper is 0.2-2%. The copper alloy has good hot workability produced by this invention.

The invention provides an oil composition for reducing the generation of polar compounds of frying oil. Triglyceride comprises 48-65wt% of SUS type triglyceride, 5-10wt% of SSU type triglyceride, 0.5-15wt% of SSS type triglyceride, 15-31wt% of SU2 type triglyceride and 0-10wt% of U3 type triglyceride, and saturated fatty acids in the oil composition account for 42-58% weight of the weight of total fatty acids; and the SUS type triglyceride with the unsaturated fatty acids being oleic acid accounts for 70-90% of the weight of all the SUS type triglyceride. The oil composition obtained in the invention has the characteristics of slow color change, few generated polar compounds, and fast fusing speed as frying oil.

The invention provides a numerical simulation method for solid/liquid phase change in a high-temperature heat storage container in a gravity condition. Numerical calculation is carried out for the complicated problem of phase change heat transfer while natural convection, cavitation and radiation conditions are simultaneously considered, technicians can acquire change of melting rate of solid/liquid phase change materials in the high-temperature heat storage container in a field and distribution of a flow field, a temperature field and liquid phase by the aid of a computer, and accordingly important references for optimizing the design of heat storage containers, suppressing cavitation, improving heat storage efficiency and reducing 'hot spots' and 'hot release'. By the aid of the numerical simulation method, the complicated problem of melting/solidification inside the high-temperature heat storage container in the gravity condition is simply and efficiently solved by the aid of a calculation program based on an enthalpy method, a finite control volume method and SIMPLE algorithm, and the numerical simulation method has important practical values.

The invention belongs to the technical field of steel smelting, and relates to a double-phase stainless steel smelting technology. According to the technology, a carbon steel material head, a stainless steel material head, stainless steel cuttings and high carbon ferro-chrome are adopted to serve as raw materials, high-chromium high-carbon molten steel is smelted through an intermediate frequency furnace, and relatively-high-cost low-carbon or micro-carbon chromium iron is not required to be adopted for smelting; after the temperature is proper, the molten steel is transferred into an AOD furnace from a steel ladle; smelting devices like the AOD furnace is adopted for conducting oxygen blowing, decarbonization and molten steel refining, and nitrogen is blown to the steel for increasing nitrogen to the steel; the cost generated by adopting nitralloy for nitrogen adding is reduced, and after the components are qualified, the steel is cast into an electrode blank; when electric slag is remelted, argon or dry air is adopted for protection, and the suction amount of a furnace hearth is further reduced; and the voltage and the current are adjusted to control the melting rate. The double-phase stainless steel smelting technology is also suitable for other applicable fields.

The invention discloses a high-desalting-rate seawater desalination method based on liquefied natural gas cold energy, which comprises the following steps: sufficiently carrying out indirect heat exchange on liquefied natural gas and a gas-state secondary coolant, and sufficiently carrying out indirect heat exchange on the obtained liquid-state secondary coolant and seawater to obtain ice and concentrated seawater; (2) taking the ice obtained in the step (1), standing under atmospheric pressure until the melting rate of ice is 10-50%, recovering the liquid, and taking the residual ice for later use; (3) crushing the residual ice obtained in the step (2) to obtain ice crystal granules, centrifuging, recovering the liquid, and taking the ice crystal granules for later use; and (4) completely melting the ice crystal granules obtained in the step (3). The invention also discloses a seawater desalination plant based on liquefied natural gas cold energy. The method utilizes the cold energy released in the liquefied natural gas gasification process, comprehensively utilizes the freeze desalting, gravity desalting and centrifuging desalting techniques, has the advantages of simple steps, energy saving and environment friendliness, and enhances the seawater desalting rate on the basis of freeze desalting.

The invention discloses a manganese additive for casting aluminum magnesium alloy and a preparation method of the manganese additive, relates to an additive for casting aluminum magnesium alloy and a preparation method of the additive, and aims at solving the problems that a conventional manganese additive is low in melting rate or infusible, low in casting yield, high in smelting temperature, long in smelting time and high in energy consumption under the existing environment with high content of magnesium. The manganese additive disclosed by the invention is prepared from manganese powder and a fluxing agent. The method disclosed by the invention comprises the following steps: mixing the manganese powder with the fluxing agent, and pressing into a cake at the pressure intensity of 7-8MPa, so as to obtain the manganese additive. The manganese additive is low in melting temperature, high in melting rate and high in casting yield, and can be completely molten at 740 DEG C; the melting rate is over 50% greater than that of the conventional manganese additive; the additive which is fed to molten aluminum magnesium alloy over 740 DEG C can be rapidly molten and can be absorbed by molten aluminum within 8-10 minutes; and the casting yield of a manganese element within 20 minutes can be up to over 90%.

The invention relates the refining slag and preparing method for super clean steel, comprising the following characters: CaOí¦93%, SiO2íœ2%, TiO2íœ100ppm, Al2O3í¦99.5%, TiO2íœ 50ppm. The refining slag comprises the following: CaO45-59%wt, Al2O340-50%wt, SiO21-5%wt, TiO2íœ50ppm, N íœ200ppm, (B+Pb)íœ100ppm, (S+P)íœ200ppm. In the refining slag the impurity and harmful elements content are low, meeting the requirement of super clean steel. That adding the petroleum coke air-captive and barium carbonate research agent reduces the fusion point of super clean steel, accelerates the melting rate, and improves the sulfur-phosphorous specific capacity. The percents of pass of bearing steel and car steel are above 98%, and the international SKF percent of pass of bearing steel is over 90%.

The invention discloses a method for adding alloy elements in the melting and casting process of the aluminum industry and an alloy element adding bag used for adding alloy elements. The method is as follows: the alloy element powder to be added is packed into an aluminum foil bag, and vacuum-packed, and the alloy element added bag is dropped into the aluminum liquid. The structure of the alloying element addition bag is that the aluminum foil bag is used to contain the alloying element powder required for the aluminum alloy production, and the inside of the bag is vacuumed. The invention can significantly increase the melting speed of alloy elements, improve production efficiency and reduce production cost.

The invention discloses a preparation process of high alloy hot work die steel and belongs to the technical field of metallurgy. A certain gap still exists between existing domestic high alloy hot work die steel and materials manufactured by foreign manufactures in the aspects of molten steel purity, constituent uniformity, structural fineness and dimensional accuracy. According to the preparation process, in the electroslag-remelting smelting process, the diameter of a crystallizer serves as a key parameter, and the mean melting rate of the smelting process is set through the diameter of the crystallizer; by raising the heating temperature of a steel ingot and prolonging retention time of a high-temperature section, nonuniformity of constituents of the steel ingot is remarkably reduced; an operation mode including three times of upsetting and three times of drawing-out is adopted for forging; according to a calculation method of the upsetting ratio, the ratio of heights, obtained before and after upsetting is conducted, of the steel ingot is adopted, operation can be easy and convenient to conduct, and the upsetting purpose and effect can be easy to achieve; the heat treatment temperature of quenching conducted after forging is completed is raised, and more alloying elements can be dissolved into austenite on the basis that a certain amount of carbide is reserved; and annealing is conducted through two temperature sections, and a spheroidized structure can be uniformly refined.

The invention provides a control method of aluminum content of heavy rail steel. Carbon content of tapping steel of a converter is controlled, and an carburetant is added in a tapping process; manganese and silicon ingredient adjustment is carried out by using manganese-silicon alloy, and deoxidier-2-3.5kg/ton of steel is added; active lime and bauxite are added in an LF (ladle furnace), an iron sheet ball is added in slag after top slag is completely melted; manganese alloy content fine tuning is carried out by using the manganese-silicon alloy, and the carbon content is adjusted to be 0.68-0.75wt%; and temperature is raised to 1570-1585 DEG C, a liquid steel tank is moved into a vacuum degassing (VD) furnace from the LF to conduct vacuum treatment, pouring is carried out on a continuous casting machine, and a tundish water feeding port is closed to conduct argon blowing in a pouring process. With the adoption of the control method, adding quantity of high price alloy can be substantially reduced, the aluminum content in steel in the LF is prevented from increasing and mass production is achieved under a condition that the aluminum content in the steel is lower than 0.004%; and average aluminum content can achieve lower than 0.0026%, and a melting rate of the heavy rail steel is 0.033%.

A method for determining a melting speed of protective slag includes obtaining time from electrode being inserted into insulator to holding resistance value of protective slag to be constant by measuring resistance value in melting course of protective slag then using obtained time as melting speed of protective slag. The device used for realizing said method is also disclosed.