81results about How to "Fully recrystallized" patented technology

The invention discloses a making technique of recrystallizing carborundum product, which comprises the following steps: blending carborundum powder with certain grain grade with purity over 96% and silicon powder and carbon powder evenly; adding a little of adhesive; moulding according to normal technique; placing green compact in the sintering stove; connecting graphite electrode on two ends; filling the composite powder of carborundum powder and carbon powder around two ends; supplying power for graphite electrode; utilizing the conductivity of mould to realize itself heating sintering; insulating 1-4h after the temperature reaches to 1400-1700 deg. c; heating continuously to 2500 deg. c; insulating 3-10h; cooling the stove to indoor temperature naturally; obtaining the high-purity recrystallizing carborundum product.

The invention discloses economical low-yield-ratio steel for pipe fittings for oil and gas transmission and a method for producing the economical low-yield-ratio steel. The economical low-yield-ratio steel comprises from 0.09% to 0.16% of C, from 0.20% to 0.40% of Si, from 1.00% to 1.39% of Mn, from 0.01% to 0.04% of Nb, from 0.005% to 0.018% of Ti, from 0.01% to 0.04% of V, from 0.008% to 0.035% of Als, from 0% to 0.20% of Mo, from 0% to 0.30% of Ni, from 0% to 0.30% of Cu, from 0% to 0.25% of Cr, the balance iron and inevitable impurities, wherein the total content of the Nb, the V and the Ti is lower than or equal to 0.09%, and the total content of the Mo, the Ni, the Cu and the Cr is lower than or equal to 0.40%. After the economical low-yield-ratio steel is subjected to heat treatment, the yield strength of the economical low-yield-ratio steel for the pipe fittings can be higher than 490MPa or 560MPa, the tensile strength of the economical low-yield-ratio steel can be higher than 670MPa or 720MPa, the yield ratio of the economical low-yield-ratio steel is lower than 0.80, the impact toughness of the economical low-yield-ratio steel at the temperature of minus 46 Celsius degrees is not lower than 80J, and technical requirements of X70-grade steel for pipe fittings and X80-grade steel for pipe fittings are met completely.

The invention discloses a production technology of a thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet. The oriented silicon steel sheet comprises the following components in percentage by weight: 0.003-0.05 percent of C, 4.1-9 percent of Si, 0.05-0.5 percent of Mn, 0.02-0.06 percent of Al, 0.01-1 percent of Sn, 0.05-0.1 percent of Mo, 0.2-1 percent of Cu, 0.003-0.02 percent of N, 0.002-0.06 percent of P, 0.001-0.008 percent of S and the balance of iron and other inevitable impurities. The high-magnetic induction oriented silicon steel sheet which is produced through hot rolling, cold rolling and annealing processes and the like has the superior performances such as ultra-low iron loss, high flux density, low magnetostriction coefficient and small thickness, has the advantages of simple process, stable texture and capabilities of greatly saving the materials and saving the resources while guaranteeing that the capacity of a transformer is unchanged, and is the best candidate material for manufacturing high-grade power transmission and distribution transformer cores at present.

Disclosed is a preparation method of a titanium plate for deep drawing. Titanium sponge which is not lower than the 0A level and meets the conditions that the O content is smaller than or equal to 0.05%, the N content is smaller than or equal to 0.006% and the Fe content is smaller than or equal to 0.05% is used as a raw material and subjected to smelting casting and forging, and two or more timesof drawing-out and/or upsetting are carried out in the forging process, so that a plate blank with a good structure and tiny texture is prepared; and then the plate blank is subjected to hot rolling,cold rolling and rolling in changed directions in combination with the steps of annealing and subsequent processing, so that the pure titanium plate with proper crystalline grains, qualified performance and a high Erichsen value is obtained. Through the method, the pure titanium plate can be made to be short in production procedure, high in efficiency and good in deep drawing performance.

The invention discloses a cogging method for a Ti2AlNb-based alloy ingot. The cogging method comprises the steps that the Ti2AlNb-based alloy ingot is loaded on a wire cutting machine and manufactured into a Phi290*280mm bar; the Ti2AlNb-based alloy ingot is sleeved with alumina silicate fibers, placed into a high-temperature heating furnace to be heated to 1150 DEG C and then placed on a press after the temperature is kept for 80 minutes, and repeated upsetting and drawing are performed at the strain rate of 0.01S-1; the ingot is drawn out to 350mm after first fire, upset to 350mm after second fire, drawn out to 350mm after third fire, upset to 270mm after fourth fire and drawn out to 350mm after fifth fire, and air cooling is performed. The ingot is returned to the furnace to be heated to 1150 DEG C and the temperature is kept for 40 minutes for each fire, and the final forging temperature of each fire is guaranteed to be equal to or larger than 1050 DEG C. According to the method, the steady state deformation resistance of the Ti2AlNb-based alloy ingot is reduced in a fully dynamic recrystallization state, the technological plasticity is improved, cracking is prevented, a cast structure is smashed completely, and a uniform and dense forge structure is obtained.

The invention discloses an annealing process of martensitic stainless steel cold-rolled strip steel for a tool, and belongs to the technical field of stainless steel machining. The problems that according to existing processes, strip breaking and oxidization are prone to occurring, oxide skins are uneven, the phenomena of oxidized residues, poor pickling, color difference and rough surfaces are prone to occurring, annealing raw materials pollute the environment and are high in cost, moreover, equipment is complex, the production line is long, and scratching is prone to occurring are solved. The annealing process comprises the following steps of raw material hot rolling, hot rolling annealing, hot line pickling, rolling, bell type annealing, and cutting and packaging. According to the annealing process, compared with common 2D production equipment, a bell type annealing furnace is simple in equipment, small in occupied area, low in equipment cost and easy to operate, a production methodis simple and easy to implement, manufactured strip steel is bright in surface, high in plasticity, toughness and quenching hardness, slitting machining, forming machining, surface machining and surface grinding are facilitated, and the tool with a small specification can be rolled and produced conveniently.

The invention belongs to the field of aluminum alloy sheets for automotive bodies, and relates to a six-series aluminum alloy sheet for an outer plate of an automotive body and a preparation method thereof. The six-series aluminum alloy sheet is prepared from the following elemental constituents according to weight percentages: 0.55 to 0.65 % of Si, 0.10 to 0.20% of Fe, 0.10 to 0.20% of Cu, 0.05 to 0.15% of Mn, 0.65 to 0.75% of Mg, 0. 01 to 0.03% of Ti, less than or equal to 0.03% of single impurity, less than or equal to 0.10% of impurities in total, and the balance being Al. According to thepreparation method of the six-series aluminum alloy sheet, the rolling pass and working procedure time of hot rough rolling are strictly limited, and annealing is performed two times in the cold rolling process. Compared with a traditional 6016 alloy, the finished product has the advantages that the edge covering performance is significantly improved, the finished product has a smooth and fine surface without macroscopic Roping line defects after stamping, and the surface quality is significantly improved.

The invention discloses 430 ferritic stainless steel for kitchen ware panels and a preparation method thereof. The 430 ferritic stainless steel comprises the following components in percentage by mass: 0.030-0.05% of C, 0.02-0.05% of N, 0.20-0.40% of Si, less than or equal to 0.20% of Ni, less than or equal to 0.35% of Mn, 16.00-16.50% of Cr, less than or equal to 0.035% of P, less than or equal to 0.010% of S, and the balance of Fe and inevitable impurity elements. The equivalent value of nickel is not greater than 2.00, and the equivalent value of chromium is not less than 16.50. During preparation, a hot-rolled black skin roll is subjected to cover annealing, acid pickling, cold rolling, cold annealing and acid pickling, leveling and other procedures to be prepared into a finished product with the required target thickness. The formula and the preparation process of the 430 ferritic stainless steel are scientific and reasonable, and the prepared stainless steel has higher ferritic stability and lower hardness and yield strength, so that the material is more suitable for stamping, can meet the requirement of cost control in the kitchen ware industry, and is suitable for production and processing of high-end kitchen ware.

The invention relates to an isothermal die forging technology for large-size high-strength aluminum alloy parts, and belongs to the technical field of aluminum alloy machining. According to the isothermal die forging technology, large-size aluminum alloy forging cake blanks undergo isothermal die forging formation in one step after being heated and thermally insulated for obtaining forge pieces, the forge pieces are taken out and cooled, and finally finished products are obtained; in the isothermal die forging process, the descending speed of upper dies is 0.1-0.2 mm/s. By selecting raw materials and strictly controlling forging parameters, continuous large deformation is realized on the condition that alloy crystal grains do not grow, and the large-size and high-performance aluminum alloy parts can be prepared with high efficiency and low cost. The isothermal die forging technology has the advantages that the operation is easy, the production efficiency is high, the product quality is high and the practicability is high, thereby being suitable for industrialized use and popularization.

The invention relates to a low-expansion alloy and a preparation method thereof, and relates to the technical field of low-expansion alloys. According to the mainly adopted technical scheme, the volume fraction of annealing twin crystals in the low-expansion alloy is larger than or equal to 20%, and the linear expansion coefficient of the low-expansion alloy within the temperature range of -160 DEG C to 25 DEG C is 0.8*10<-6>/DEG C to 1.5*10<-6>/DEG C. The preparation method of the low-expansion alloy comprises the step of sequentially carrying out solution treatment, cold rolling deformationtreatment and annealing treatment on a low-expansion alloy body so as to obtain the low-expansion alloy, wherein in the cold rolling deformation treatment step, the total deformation of the alloy is 65-99%, and in the annealing step, the annealing temperature ranges from 800 DEG C to 900 DEG C, and the annealing time ranges from 5 min to 30 min. According to the low-expansion alloy, annealing twincrystals can be effectively introduced into the low-expansion alloy, so that the low-expansion alloy is strengthened on the premise that the linear expansion coefficient of the alloy is hardly influenced. The contradictory relation between the expansion performance and the strength of the alloy is fundamentally solved, and application of the low-expansion alloy in precise structural parts is facilitated.

The invention provides an anti-corrosion aluminum alloy pipe and belongs to the technical field of aluminum alloy materials. The composition elements of the aluminum alloy pipe comprise, by mass, 0.05-0.1% of Si, 0.15% of Fe or the less, 0.01% of Cu or the less, 0.8-1.0% of Mn, 0.2-0.4% of Mg, 0.01% of Zn or the less, 0.01-0.05% of Ti, 0.05% of the other elements or the less and the balance Al. According to the anti-corrosion aluminum alloy pipe, through adjustment of components and change of the technique, the anti-corrosion performance of the aluminum pipe can be effectively improved while the 3003 aluminum pipe strength is met, and the service life of a product is prolonged.

The invention discloses easy-to-cut titanium alloy, which comprises the following components in percentage by weight: 3 percent to 6.1 percent of chromium, 1 percent to 4 percent of manganese, 5.1 percent to 8 percent of aluminum, 0.4 percent to 1.3 percent of silicon, 3.7 percent to 7 percent of magnesium, 1.3 percent to 2.7 percent of lead, and the balance titanium. According to the easy-to-cut titanium alloy provided by the invention, the manganese, the aluminum, a small amount of lead and other metals are added, a vacuum consumable-electrode arc melting technology is adopted for melting for three times repeatedly, and degassing, deoxidizing and impurity removing processes are better realized for the metal materials, so that a pure metal material billet is acquired; due to high melting rate and the accurate control of an electric arc heating area, the consistency of a melting metal solidification direction is ensured, a metal performance of the material is greatly improved, and the titanium alloy can be easily cut; and later, double annealing is carried out, so that recrystallization is fully carried out without increasing crystal particles in the titanium alloy, the plasticity and the structure stability of the titanium alloy are improved, the machinability of the titanium alloy is improved, and meanwhile, the high strength and the stability of the titanium alloy are further maintained.

The invention discloses a production method of a large-specification nickel-base high-temperature alloy forged piece. By means of the steps of blank preparation, grinding feeding operation, heating and heat preservation, isothermal forging operation and machining operation, the isothermal forging technology is adopted to control the technological parameters such as the blank height-diameter ratio,the forging temperature and the deformation rate, the mold temperature is controlled within a certain range, the blank temperature drop is effectively reduced, then delta-phase excessive precipitation is avoided, and the grain organization can be effectively refined under the condition of the high deformation. The GH4169 alloy (In718 in foreign countries) forged piece which meets the requirementsof airspace engines and vessel steam turbines is produced, and has the excellent strength, the endurance property and the high toughness.

The invention relates to a method for manufacturing brass widely used as conductive element in ore-smelting electric furnace equipment in enterprises producing metallic silicon, ferrosilicon, calcium carbide and the like. The whole production technique mainly comprises the steps of adding trace lithium salt in red copper in melting and casting semicontinuously, hot rolling in set dimension, rough processing the blanks, drilling cooling deep holes, cold pressing and shaping, assembling into a whole, testing the finished product, etc. Cathode pure copper is selected as raw material compulsorily; deoxidation is carried out in melting to ensure the casting blank to be anaerobic copper ingot, and trace lithium salt is added, after casting and crystallizing, the compactness, corrosion resistance, high temperature resistance, abrasion resistance, impact resistance, hardness, electrical conductivity and thermal conductivity of the copper product are improved; the hot rolling process smashes bulky arborization crystal to cause crystalline grains to be thin, the fiber structure is continuous with being cut off the mechanical property, electrical conductivity and thermal conductivity are vastly enhanced; water holes are cooled by deep hole drilling machine processing; a press is used for performing cold pressing to roll the blank into arc shape; a boring machine and other equipments are used for boring out required cambered surface radius, electrical conduction joint parts and brass propping parts; and finally the parts are assembled into a whole, and the product is warehoused after passing the test.

The invention discloses a method for manufacturing a boron-containing diamond compact. The method comprises the steps as follows: (1) diamond powder is soaked in a boric acid aqueous solution; (2) soaked diamond micro-powder is dried; (3) dried diamond micro-powder is evenly mixed with a binding agent; (4) the diamond micro-powder mixed with the binding agent is combined with a hard alloy matrix to form a synthetic block; (5) the synthetic block is placed in a special press for diamond for high-temperature and high-pressure treatment at the high temperature of 1,400-1,650 DEG C and under the high pressure of 5-7.5 MPa. With the method, the phenomenon of uneven boron containing or local accumulation in mixtures due to other methods is avoided, and more sufficient crystallization is realized through pretreatment, so that the strength, the wear resistance, the impact resistance, the heat resistance and the oxidation resistance of a diamond layer are further improved.

The invention relates to a forging processing technique for a Fe-Si-B magnetic material. Fe-Si-B magnetic material blank is fed into a furnace at room temperature, slowly heated to 610 DEG C, kept warm, heated to 720 DEG again, subjected to warm keeping, then heated to 820 DGC C, kept warm, heated to 920 again, subjected to warm keeping, heated to the peak temperature of 1080 DEG C, subjected to warm keeping and forged. According to the invention, through heating pre-processing and reasonable heating processing parameters, the Fe-Si-B magnetic material can be prevented from fracturing when being heated before forging, so that the Fe-Si-B magnetic material can be processed and produced through a forging technology, and the problem that the conventional Fe-Si-B magnetic material fractures when being forged and heated directly and can not be produced through forging is solved.

The invention discloses a method for improving the stability of the contracting sizes of TC4 medical U-shaped nails. The method for improving the stability of the contracting sizes of the TC4 medical U-shaped nails comprises the following steps of high-temperature heat treatment, hyperbolic curve straightening, low-temperature heat treatment, and detection of the contracting sizes of the U-shaped nails. According to the method for improving the stability of the contracting sizes of the TC4 medical U-shaped nails, a rod which is provided with an equiaxed structured and sufficient in re-crystallization is obtained through adjustment of the high-temperature heat treatment temperature; then, a rod meeting the GB/T 13810-2007 requirements is obtained through adjustment of the low-temperature heat treatment temperature; and finally, the rods obtained after different heat treatment technologies are conducted are each machined into 15 U-shaped nails, and the contracting size of each U-shaped nail is detected. Because the high-temperature heat treatment technology and the low-temperature heat treatment technology of the TC4 rods are adjusted, and detection is additionally conducted in each step, the contracting size of each U-shaped nail is guaranteed to be smaller than 0.10 mm, and the contracting sizes are kept stable. When the method for improving the stability of the contracting sizes of the TC4 medical U-shaped nails, it is only needed to conduct high-temperature and low-temperature heat treatment on the TC4 rods within a certain temperature range, other technological parameters do not need to be adjusted, and temperature adjustment is convenient, reliable and easy to operate.

The invention relates to a production method of cover type intermediate annealing high-grade non-oriented silicon steel 50BW350. The production method comprises the steps of molten steel chemical component design, a hot rolling process, a cold rolling process, an annealing process and the like. The molten steel comprises the following chemical components: less than or equal to 0.004% of C, 1.80-2.1% of Si, 0.70-0.90% of Mn, 0.30-0.45% of Als, less than or equal to 0.015% of P, less than or equal to 0.0030% of S, less than or equal to 0.0020% of O, less than or equal to 0.0025% of N, 0.06-0.12% of Sb and the balance of Fe. The high-grade non-oriented silicon steel product without surface corrugation defects is obtained through special chemical design, Sb element addition, improvement of electromagnetic performance by optimizing the structure of the product, proper reduction of Si content, improvement of Mn element content and elimination of the influence of hot-rolled thick fiber tissues by a secondary cold rolling method. And compared with a traditional high-grade production method, the cost is low, and the produced silicon steel is excellent in electromagnetic performance.