60results about How to "Improve high temperature plasticity" patented technology

The invention discloses a method for producing a hot-rolled ferrite stainless strip steel, which comprises the following steps: 1) the chemical components by weight percentage are: 0.025-0.04 percent of C, less than or equal to 1.00 percent of Si, 0.25-0.4 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.035 of P, 12-12.5 percent of Cr and the rest is Fe; 2) a billet is formed by smelting and casting; 3) heating: the heating temperature zone for heating are divided into a heat recovery section, a preheating section, a I heating section, a II heating section and a holding section; furnace gas is controlled to be neutral atmosphere of non-oxidizing atmosphere; 4) when in heat rolling and rough rolling, the rolling temperature is 1,120 DEG C-1,160 DEG C, and the deforming speed during rolling is 10/s-12/s; 5) finish rolling: the deforming speed of the last pass rolling is 60/s-90/s, and the outlet temperature of the finish rolling is more than 900 DEG C; 6) cooling is carried out after rolling, and then reeling is carried out. The method of the invention has the advantages that the method guarantees not only the edge quality of the hot-rolled strip steel but also the stamping property of the cold-rolled strip steel, improves the surface finish quality and lowers the production cost, and has high production efficiency and rolling yield, etc.

The invention relates to a Fe-based austenite alloy oil sleeve, which comprises the following components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.01 to 1.0 percent of Si, 0.01 to 3.0 percent of Mn, 25 to 40 percent of Ni, 20 to 35 percent of Cr, 1 to 5 percent of Mo, 0.1 to 1.5 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, and the balance of Fe and inevitable impurities. The 90 to 140 ksi steel-grade Fe-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,180 DEG C of solution treatment and cold rolling of the smelted and forged blanks.

The invention relates to a preparation process of nickel-saving type double-phase stainless steel, comprising the following steps of: 1) controlling components of a mother solution in an electric furnace as follows: more than 1.0% of C, less than 1.0% of Si, 12-21% of Cr, 1.5-1.9% of Ni and less than 0.025% of P, controlling a tapping temperature at 1580-1630 DEG C, and mixing the mother solution in the electric furnace with a high-carbon ferro-chrome mother solution in an intermediate-frequency furnace to form a mixed mother solution, wherein the high-carbon ferro-chrome mother solution contains the following components of 6-10% of C, less than 0.5% of Si, less than 0.06% of P, 62-72% of Cr and the balance of iron; and 2) blending the mixed mother solution into an AOD (Argon Oxygen Decarburization) furnace to carry out oxygen blowing and decarburization, nitrogen blowing and component adjustment, refining in a steel ladle refining furnace and adding a micro-alloy into the components, and finally adjusting, wherein the adjusted chrome-nickel equivalence ratio is more than or equal to 2.2. The chrome-nickel equivalence ratio is properly controlled to be good for forming double-phase stainless steel high-temperature ferrite so that heat machining is carried out in a single-phase region to the greatest extent; and furthermore, the preparation process is good for the high-temperature plasticity of the double-phase stainless steel.

The invention discloses a low-cost X65 pipeline steel based on magnesium treatment, and a manufacturing method thereof. A purpose of the present invention is mainly to solve the technical problem of high manufacturing cost of the existing X65 pipeline steel. According to the present invention, the low-cost X65 pipeline steel comprises the following chemical components by weight: 0.07-0.09% of C, 0.1-0.3% of Si, 1.35-1.45% of Mn, less than or equal to 0.006% of S, less than or equal to 0.015% of P, 0.035-0.045% of Nb, 0.010-0.025% of Ti, 0.0010-0.0030% of Mg, 0.020-0.030% of Al, less than or equal to 0.006% of N, and the balance of Fe and unavoidable impurities. According to the present invention, the metallographic structure of the hot-rolled steel plate comprises fine-grained ferrite, acicular ferrite and pearlite, and the elongation A after break of the hot-rolled steel plate having the thickness of 10.0-15.0 mm is more than or equal to 24%.

The invention relates to a secondary cooling nozzle arranging method for improving surface plasticity of a casting blank and a secondary cooling control method. In the secondary cooling nozzle arranging method, wide nozzles and narrow nozzles are formed in the vertical section of a continuous casting machine, and the wide nozzles and the narrow nozzles are controlled by independent loops respectively; after a continuous casting blank is discharged from a crystallizer, by the secondary cooling nozzle arranging method, the casting blank is forcibly cooled with the amount of secondary cooling water of 15-40m<3>/ h to rapidly reduce the surface temperature of the casting blank to below 750 DEG C; narrow corner nozzles and wide corner nozzles in a lower area of the vertical section are closed to rapidly raise the surface temperature of the casting blank to about 1100 DEG C, and from the bent section to the horizontal section, a conventional cooling mode is adopted with the amount of the secondary cooling water of 2-10m<3>/ h. In the secondary cooling nozzle arranging method, the changing course of the surface temperature of the casting blank enables the surface tissue of the casting blank to experience once heat treatment, so that the surface tissue of the casting blank is greatly thinned; after rewarming, a dense austenitic tissue is formed on the surface of the casting blank, the precipitation amount of a grain boundary ferrite film is inhibited at the same time, and the high-temperature plasticity of the surface of the casting blank is radically improved.

An ultra-thin copper alloy bonding wire for microelectronic packaging is characterized by being prepared from 10-50 wt.ppm of Ti, 10-50 wt.ppm of Li, 10-50 wt.ppm of Zr, 10-50 wt.ppm of Fe, 10-50 wt.ppm of Ag, 10-50 wt.ppm of B, 10-50 wt.ppm of a rare earth element and the balance copper and inevitable impurities, wherein the content of O and S in the impurities accounts for 5 wt.ppm or less in the whole copper alloy bonding wire, and the rare earth element is one of Eu, Y and Dy or a combination of Eu, Y and Dy. The invention further provides a preparing method of the ultra-thin copper alloy bonding wire for microelectronic packaging. The copper alloy bonding wire has the good oxidation resistance, good electric and heat conductivity, good weldability, large single wire length and other good performance, and the preparing method of the copper alloy bonding wire is easy and convenient to implement.

The invention belongs to the technical field of magnesium-lithium alloy material preparation, and particularly relates to a high-strength high-plasticity high-yield-ratio magnesium-lithium alloy and apreparation method and application thereof. The high-strength high-plasticity high-yield-ratio magnesium-lithium alloy and the preparation method and application thereof are used for solving the problems of low absolute strength, difficult matching of strong plasticity and yield ratio of the magnesium-lithium alloy, the high-strength high-plasticity high-yield-ratio magnesium-lithium alloy material with high yield ratio, good plasticity, stable quality and high purity is obtained by designing the components of the magnesium-lithium alloy, optimizing a vacuum casting process and adopting a novel deformation heat treatment process, and the magnesium-lithium alloy has an industrialized practical application prospect. According to the preparation method of the high-strength, high-plasticity and high-yield-ratio magnesium-lithium alloy, the plastic processing procedure is simple, the maneuverability is high, only medium-high temperature solution treatment and medium-low temperature deformation are needed, intermediate process annealing is not needed, the yield is high, the economical efficiency is high, and the magnesium-lithium alloy product with the tensile strength of 330 MPa, the yield strength of 314 MPa, the elongation of 16% and the yield ratio of up to 95% or above can be obtained through the method.

The invention discloses an electroslag ignition agent and a preparation method thereof. The electroslag ignition agent is used for igniting and remelting slag material in an electroslag remelting technology to establish electroslag. The ignition agent comprises the following raw material components in percentage by weight: 25-35% of fluorite powder, 2-12% of silica powder, 30-40% of graphite electrode powder, 1-11% of quicklime powder and 18-28% of water glass. The preparation method comprises the following process steps: preparing mixed dry powder: uniformly mixing the raw materials according to the content in percentage by weight of each raw material and the carrying capacity of a mold to obtain the mixed dry powder; mixing with sludge, loading into the mold, adding the water glass into the mixed dry powder, stirring till no dry powder exists, loading a mixture which is uniformly stirred into the mold, tamping and compacting; blowing gas, demolding, blowing CO2 into the mold, and demolding after stopping gas blowing to obtain an ignition agent block; and drying at low temperature. The ignition agent disclosed by the invention has a good arc starting effect in the using process and can avoid a titanium-increasing effect, and high-temperature smelting is not required in the manufacturing process of the ignition agent.

The invention discloses a production method for preventing straightening and hot delivering cracks of a microalloy continuous casting slab. The production method comprises the following steps: quicklycooling the continuous casting slab before straightening, wherein the cooling rate is 5-10 DEG C/s and the surface temperature of the continuous casting slab is reduced to be lower than 450 DEG C; controlling the surface temperature of a blank in a straightening stage to be smaller than or equal to 600 DEG C; and carrying out temperature return control on the continuous casting slab which is straightened and is not cut, and controlling the surface temperature of the continuous casting slab after temperature return to be higher than the temperature of a steel type Ar3. The production method has the advantages that the hot filling and hot delivering quality and efficiency are improved while the surface quality of the continuous casting slab is improved.

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.

Provided is a nickel-based superalloy electroslag remelting slag system. The slag system is prepared from, by weight, 65%-75% of CaF2, 15%-25% of Al2O3, 5%-19% of MgO and 0-5% of SiO2. The total quantity of impurities is smaller than 1.0%. When the slag system is used for carrying out electroslag remelting on nickel-based superalloy, a steel ingot obtained through remelting is low in oxygen content and small in non-metal occluded foreign substance quantity, the surface and interior quality of the electroslag remelting steel ingot can be effectively improved, and the subsequent machinable property of electroslag remelting steel ingot can be enhanced.

The invention discloses a flux-cored wire for welding of a titanium-steel dissimilar metal sheet. The flux-cored wire comprises a flux core and a metal sheath. The flux core comprises, by mass percentage, 60-80% of V powder and 20-40% of Ni powder, wherein the sum of the mass percentage of the components is 100%. The preparation method comprises the steps that the V powder and Ni powder are sintered after being mixed and then are wrapped with a copper strip, and the flux-cored wire is obtained after drawing. A welding joint obtained by the flux-cored wire has the excellent toughness. The number of the alloy elements of the flux-cored wire is small, the preparation process is simple, and the large-scale mass production is facilitated.

The invention discloses a gamma'phase pre-adjusting plasticizing production process of a high-performance high-temperature alloy, and belongs to the technical field of material processing. The gamma 'phase pre-adjusting plasticizing production process comprises the following preparation steps: 1, smelting is performed to prepare a cast ingot to form a fine-grain homogeneous bar after multi-heating forging; 2, before the bar is forged in a two-phase region, when the heating number forging deformation is higher than the critical cracking deformation, the bar is treated through the gamma'phase pre-adjusting plasticizing technology so as to improve the critical cracking deformation, gamma 'phase pre-adjusting plasticizing adjusts the temperature of the bar subjected to two-phase region forging to be the forging temperature Td, heat preservation is conducted for 2-12 h, then the temperature is reduced to 800-1000 DEG C at the speed of 5-50 DEG C/min, and heat preservation is conducted for 3-12 hours; and 3, the cast ingot or the bar billet obtained in the second step is heated to the forging temperature Td again, heat preservation is conducted, the cast ingot or the bar billet is taken out of a furnace and forged, and a homogeneous bar billet is obtained after multiple times of forging. The hot working high-temperature plasticity of the high-temperature alloy is improved.

The invention provides an ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy and a preparation method thereof. The ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy comprises main alloy elements and trace alloy elements; the main alloy elements comprise essential elements and adjustable elements, the essential elements comprise tungsten, molybdenum and nickel, and the adjustable elements comprise cobalt and/or niobium; and the trace alloy elements comprise one or more of palladium, tantalum and hafnium. The preparation method of the ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy comprises the steps that raw materials are smelted to obtain a cast ingot, and then homogenization treatment, forging and heat treatment are sequentially conducted. According to the ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy, the adoption of elements such as nickel and cobalt as a binary alloy matrix in the prior art is broken through, a high-density mono-stable face-centered cubic high-entropy alloy phase is constructed by adopting various high-density elements and strengthening elements, the stability and strengthening capacity of a solid solution are greatly improved by utilizing the high-entropy effect and the cocktail effect, and the deformability of the alloy is improved.

The invention discloses an electroslag remelting slag system for duplex stainless steel. The electroslag remelting slag system is prepared from the following components in percent by weight: 50.0-65.0% of CaF2, 8.0-15.0% of Al2O3, 3.0-10.0% of CeO2, 15.0-20.0% of CaO, 3.0-5.0% of MgO, 1.0-3.0% of SiO2 and the balance impurities which are not more than 1%. According to the slag system, the slag viscosity changes gently as the temperature is reduced, and the high temperature plasticity and the strength of slag can be also improved, so that bleed-out and slag leakage are prevented. The conductivity of the slag can be reduced, the chemical stability of the slag can be improved, and the system has better deoxidizing and desulfurizing effects and inclusion absorption action, thereby playing a role of purifying molten steel deeply. As-cast grains can be refined, and the strength and the toughness of steel are improved. The electroslag remelting slag system is uniform to transfer heat and goodin lubricating effect, and the slag layer is kept stable and is melted uniformly.

The invention discloses high-formability boron-containing steel with tensile strength higher than or equal to 320 MPa. The high-formability boron-containing steel is prepared from the following components in percentage by weight (wt%): 0.03-0.07% of C, 0.01-0.3% of Si, 0.4-0.9% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.006% of N, 0.0005-0.003% of B, and 0.03-0.08% of Ti. A production method comprises the following steps: continuously casting to form blank after smelting; heating in stages; roughly rolling; performing fine rolling; performing laminar cooling; and rolling. The high-formability boron-containing steel has yield strength of 250-350 MPa, tensile strength of 320-460 MPa, and ductility higher than or equal to 32%; moreover, cast blank does not need to cut corner after being unloaded if a secondary cooling water ratio is not reduced and N content is not strictly limited; and hot rolling can be directly performed, so that a product defect rate can be controlled to be lower than 0.5%.

The invention discloses a high-reliability copper alloy bonding wire for microelectronic packaging. The high-reliability copper alloy bonding wire for microelectronic packaging is characterized in that the bonding wire comprises, by weight, 0.001%-0.005% of Ru, 0.001%-0.005% of Nb, 0.001%-0.005% of Zr, 0.001%-0.005% of Mn, 0.001%-0.005% of Mg, 0.001%-0.005% of Li, 0.001%-0.003% of Dy and the balance copper and inevitable impurities, and the content of S and O in the impurities in the whole copper alloy bonding wire is less than or equal to 0.0005%. The invention further provides a manufacturing method of the high-reliability copper alloy bonding wire for microelectronic packaging. The copper alloy bonding wire has the advantages of being high in reliability, low in hardness, good in electrical conductivity and heat conductivity and the like. The manufacturing method is easy to operate.

The invention relates to the field of ferrous metallurgy and particularly relates to an internal quality control method of 30Mn tube bloom steel cast blanks. The technical problem to be solved is to provide an internal quality control method of 30Mn tube bloom steel cast blanks; the method is capable of effectively controlling crack defects of cast blanks, effectively improving solidification structures of the cast blanks and achieving the internal quality control. The method comprises the following steps: a, firstly carrying out a converter smelting process; b, secondly carrying out an LF furnace molten steel refining process; and c, finally carrying out section continuous casting process, wherein electromagnetic stirring parameters of a crystallizer are characterized in that the stirring current is 300-400A, and the frequency is 2-4Hz; electromagnetic stirring parameters of a solidification end are characterized in that the stirring current is 100-200A, and the frequency is 4.0-7.0Hz; the superheat degree is controlled to be 25-35 DEG C; the pulling rate is controlled to be 0.70-1.00m/min; the cooling rate of the crystallizer is controlled to be 2400-2500L/min; the specific special water flow rate of secondary cooling is controlled to be 0.21-0.30/kg steel. The internal quality control method of the 30Mn tube bloom steel cast blanks is especially applicable to the internal quality control process of large-size 30Mn tube bloom steel cast blanks produced by phi 350mm section.

The invention relates to nuclear stainless steel electroslag remelting slag used for high-level radioactive waste curing container and a method adopting electroslag remelting. The slag comprises, by weight part, 55 to 70 parts of CaF2, 8 to 15 parts of CaO, 8 to 15 parts of Al2O3, 5 to 15 parts of MgO, 1 to 5 parts of SiO2 and 1 to 5 parts of CeO2, a slag remelting method is adopted, rare earth inthe stainless steel can be stably controlled, harmful impurities can be greatly reduced, the structure is uniform and compact, the alloy machining performance can be greatly improved, the yield rateis improved, the good mechanical property, and good properties of high temperature resistance, corrosion resistance, oxidation resistance and the like are achieved, good hot and cold machining performance, welding performance and machining performance are achieved, and the method has the wide application prospect in the nuclear waste treatment field.

The invention relates to a heating technology for avoiding surface defects of a steel plate. The heating technology comprises the specific technological process that a continuous casting machine produces a plate blank, the plate blank is cut and sprayed with a number, the plate blank enters a heating furnace to be heated, primary rolling is conducted on the plate blank, finish rolling is conductedon the plate blank, coiling and packing are conducted, and a finished product is divided. Temperature control is conducted on the plate blank before the plate blank enters the heating furnace for heating, and the specific reaction condition comprises that the surface temperature of the plate blank is controlled to be higher than the Ar3 temperature or controlled to be lower than the Ar1 temperature and higher than 200 DEG C. By the adoption of the heating technology for avoiding the surface defects of the steel plate, on the premise of not increasing any equipment and production cost, hot delivery and hot charging of the plate blank are achieved, waste heat of a continuous casting blank is fully utilized, and then a good energy-saving effect is achieved; and oxidized scale on the surfaceof the steel plate is easier to remove, carbonitride is fully dissolved in the heating process, the high-temperature plasticity of steel is improved, and the surface defects such as slag inclusion andcracks of the rolled steel plate are avoided.

The invention provides a method for smelting a high-tungsten high-cobalt-nickel alloy through electroslag remelting, the high-tungsten high-cobalt-nickel alloy and a shaped charge liner. The method for smelting the high-tungsten high-cobalt-nickel alloy through electroslag remelting comprises steps that raw materials of an electroslag remelting slag system are subjected to slagging, then an electrode ingot made of the raw materials of the high-tungsten high-cobalt-nickel alloy is smelted, and the high-tungsten high-cobalt-nickel alloy is obtained, wherein the electroslag remelting slag systemcomprises the following raw materials in percentage by mass: 39-44% of CaF2, 24-28% of CaO, 14-18% of Al2O3, 3-5% of MgO and 5-10% of SiO2. The high-tungsten high-cobalt-nickel alloy is prepared by using the method for smelting the high-tungsten high-cobalt-nickel alloy through electroslag remelting. The raw material of the shaped charge liner comprises the high-tungsten high-cobalt-nickel alloy.According to the electroslag remelting slag system provided by the invention, the sulfur content of the alloy can be effectively reduced, the purity of the alloy is improved, and the high-plasticity alloy with good surface quality is obtained.