57 results about "Isothermal annealing" patented technology

The invention aims to provide a heat treatment method for reducing quenching stress and improving low-temperature toughness of a Cr-Ni-Mo-V steel forging, and belongs to the technical field of metal material heat treatment. The method comprises the following steps: (1) carrying out isothermal annealing heat treatment on the Cr-Ni-Mo-V steel forging; (2) carrying out normalizing heat treatment on the isothermal annealing forge piece; (3) carrying out tempering heat treatment on the normalized forge piece; (4) the tempered forge piece is subjected to step quenching treatment; and (5) carrying out rapid tempering treatment on the quenched forge piece. By means of the heat treatment method, the surface quenching residual stress of the Cr-Ni-Mo-V steel forge piece can be reduced by 30% or above, meanwhile, the strength and low-temperature impact energy of the Cr-Ni-Mo-V steel forge piece are improved by 10% or above, and the safety and reliability of the Cr-Ni-Mo-V steel forge piece are improved.

The invention discloses a method for simultaneously optimizing the squareness and the remanence temperature coefficient of a 2: 17 type samarium-cobalt sintered magnet, and belongs to the technical field of rare earth permanent magnet material preparation. A component Sm < 1-x > RE < x > (CobalFeaCubZrc) z is designed, RE is one or more of Dy, Er, Gd, Tm and other heavy rare earth elements, and a, b, c and x meet the following relations: 0 < = x < = 0.6, 0.1 < = a < = 0.2, 0.06 < = b < = 0.12, 0.02 < = c < = 0.03, and 6.9 < = z < = 7.9. On the basis of a conventional smelting and ingot casting-isothermal annealing-powder preparation-oriented profiling-sintering-solid solution-aging process, an isothermal annealing process is added after smelting and ingot casting: the temperature is raised to 1190-1210 DEG C in a tubular furnace, isothermal annealing is performed for 5-20 hours, heavy rare earth elements are eliminated, and the influence of the stability of a 2: 17H phase on the component uniformity and magnetic performance of a magnet is improved; and substitution sites of heavy rare earth can be increased, and the residual magnetism temperature coefficient is optimized.

The invention relates to a preparation method of a TC8-1 titanium alloy disc forge piece, belongs to the technical field of titanium alloy forging, and at least solves the problem that a disc forge piece prepared by an existing method is insufficient in structure uniformity and batch consistency. Small-specification disc forgings are difficult to form; the heat treatment process and the obdurability matching are unreasonable. Comprising the steps that a TC8-1 titanium alloy bar is adopted as a raw material, a blank manufacturing mode is selected according to the height-diameter ratio of the TC8-1 titanium alloy bar, and a disc forging blank is obtained; according to the thickness of the disc forging blank, a disc forging forging forming mode is selected, and a disc forging blank is obtained after forging; performing double isothermal annealing treatment on the disc forging blank to obtain the titanium alloy disc forging; the dual isothermal annealing treatment comprises the steps of heating a disc forging blank to a first heavy annealing temperature for heat preservation, heating a converter to a second heavy annealing temperature for heat preservation, cooling by a fan in the converter process, and controlling the converter time to be less than or equal to 10 minutes. The TC8-1 titanium alloy disc forge piece prepared through the method is high in structure uniformity and batch consistency.

The present invention discloses a manufacturing process for a riser joint of an offshore oil and gas platform, relating to the technical field of preparation, including: the manufacturing process selects forgings with specific components, smelts them through an electric furnace or an oxygen converter, and conducts forging, isothermal annealing, final heat treatment, and mechanical property testing; the method for monitoring the isothermal annealing temperature includes: monitoring the temperature in the furnace cooling stage, calculating the isothermal trade-off value to determine the isothermal analysis point; constructing an isothermal gradient field, analyzing the temperature change, constructing an equivalent cooling temperature curve, and comparing it with the continuous cooling transformation curve of supercooled austenite; if the trend of the curve changes inconsistently, judge whether the current temperature is in the bainite stage, and if not, judge the regulation margin; if the regulation margin is insufficient, calculate the approximate time difference, regulate the temperature in stages, and improve the stability of the process.

A method and system for preparing forged structural parts from TC6 material are disclosed. First, TC6 bar stock is sawn, and the β-phase transformation temperature (Tβ) of the sawn TC6 bar billet is measured. Then, the billet is heated to a high temperature (Tβ-40) ±10℃ in an electric furnace and held to obtain a pre-treated TC6 bar billet. Next, the pre-treated TC6 bar billet undergoes a series of processes in sequence: small-end aggregation, flat forging, bending, flat forging, large-end aggregation, flat forging, large-end forming, flat forging, and intermediate billet treatment to obtain a secondary-treated TC6 bar billet. This secondary-treated TC6 bar billet is then heated to a high temperature (Tβ-40) ±10℃ in an electric furnace and held to obtain a billet to be forged. Finally, it is forged using an electric screw press, followed by heat treatment, isothermal annealing, and physicochemical testing to obtain the machined TC6 material structural part. Finally, the parts are inspected, and qualified parts are stored in the warehouse. This process yields qualified structural parts.

The invention discloses a medium carbon steel refined structure heat treatment process, and belongs to the technical field of metal material heat treatment. A medium carbon steel refined structure heat treatment process comprises the steps that S1, shot blasting pretreatment is conducted on the surface of a medium carbon steel workpiece; s2, the workpiece subjected to shot blasting is heated to the austenitizing temperature through a high-frequency induction heating device; s3, the heated workpiece is subjected to heat preservation at the critical zone temperature; s4, the workpiece subjected to heat preservation is put into a quenching medium containing nanoparticles for gradient quenching; and S5, the quenched workpiece is subjected to segmented isothermal annealing treatment. According to the method, the grain size is larger than or equal to 9 grades, the pearlite interlamellar spacing is smaller than or equal to 0.3 micrometer, the impact toughness is larger than or equal to 150 J, and the method is suitable for manufacturing key parts such as automobile parts, aviation structural parts, high-precision gears and bearings.

The invention discloses a vacuum sub-temperature gas quenching heat treatment process of an X12Cr13 material, which comprises the following steps: isothermal annealing treatment: carrying out heat preservation for an effective thickness of mm / (33-40) mm for hours at a temperature of 930-990 DEG C, then carrying out heat preservation for an effective thickness of mm / (33-40) mm for hours when a furnace is cooled to 740-780 DEG C, and finally carrying out furnace cooling, discharging and air cooling; vacuum sub-temperature gas quenching treatment is conducted, specifically, vacuumizing is conducted till the vacuum degree is smaller than or equal to 1.33 * 10 <-3 > Pa, the temperature is increased to 900-950 DEG C, heat preservation is conducted, the heat preservation time is effective thickness mm / (33-40) mm h, then nitrogen is injected into the furnace for cooling, and finally the steel is taken out of the furnace for air cooling; and tempering treatment is conducted, specifically, vacuumizing is conducted till the vacuum degree is smaller than or equal to 1.33 * 10 <-3 > Pa, the temperature is increased to 680-730 DEG C, heat preservation is conducted, the heat preservation time is effective thickness mm / (18-20) mm hours, then nitrogen is injected into the furnace for cooling, and finally the steel is taken out of the furnace for air cooling. The heat treatment process is used for heat treatment of the compressor impeller X12Cr13 material, the hardenability and the mechanical property of the impeller are guaranteed, and the heat treatment deformation of the impeller is reduced.

The application discloses a kind of anchor rod body intelligent production method and anchor rod body based on multiple agents, and the target wall thickness and target rolling force determined by intelligent perforating body are used to carry out perforating treatment to base material, and hollow pipe blank is obtained;The power of each region in hollow pipe blank is adjusted by intelligent annealing body to realize isothermal annealing, and the optimal holding time is calculated, and once cold straightening is carried out using straightening machine;The hollow pipe blank after pickling is obtained after once straightening hollow pipe blank is pickled;The rolling force prediction value and the rolling piece outlet thickness prediction value of each pass obtained by intelligent finish rolling body are used to carry out multi-pass finish rolling forming to the hollow pipe blank after pickling, and rolled anchor rod is obtained;The rolled anchor rod is carried out secondary annealing treatment and secondary straightening;The rolled anchor rod after secondary straightening is carried out fixed-length cutting, cold-rolled rib and thread rolling processing, and anchor rod body is obtained.The application adaptively adjusts process parameters, improves the stability of product quality, and reduces energy consumption under the premise of ensuring annealing effect.

The invention relates to the field of preparation of energy storage materials, and discloses an ultrasonic-assisted preparation method of a paraffin / nano-metal composite phase change energy storage material. Comprising the following steps: heating paraffin to a temperature 10-20 DEG C higher than the phase transition temperature of the paraffin to melt the paraffin, and adding nano metal particles subjected to surface modification into the molten paraffin to form a uniform suspension system; a multi-field coupling field composed of an ultrasonic frequency band sound field and an alternating electric field is applied in a molten state, and particles construct a heat conduction channel network at a phase boundary through low-frequency pulse dispersion, medium-frequency sweep frequency chained orientation and high-frequency stable frequency standing wave aggregation in sequence; paraffin molecules are induced by high temperature and high pressure generated by cavitation collapse to react with the metal surface to generate a composite interface layer; graded cooling is carried out in a high-frequency standing wave sound field, so that the particles form concentration decreasing distribution in the vertical direction, and a chain structure is stabilized through a weak alternating electric field; and after curing, carrying out constant-temperature annealing to stabilize the interface layer and eliminate residual stress.

The invention belongs to the field of metal materials, and provides a high-strength plastic magnesium alloy based on isothermal annealing under constant stress and a preparation method. The magnesium alloy is prepared from the following components in percentage by mass: 1.2 to 1.5 percent of Al, 0.2 to 0.4 percent of Ca, 0.5 to 0.8 percent of Gd, less than or equal to 0.05 percent of inevitable impurities and the balance of magnesium. The preparation method of the high-strength plastic magnesium alloy comprises the steps of casting, stepped homogenization treatment, hot extrusion, high-temperature solid solution treatment, rolling and isothermal annealing treatment under constant stress. Rapid recrystallization and texture weakening are achieved under the low-temperature and short-time conditions, a large number of high-thermal-stability nano Al-Gd and Al-Ca phases exist in the alloy, the strength is improved, meanwhile, the defects of uneven tissue, abnormal grain growth and the like caused by traditional high-temperature heat treatment are overcome, and the heat treatment cost is remarkably reduced. The finally obtained alloy has a weak texture which deflects in the rolling direction RD and the transverse direction TD, and the peak strength is smaller than or equal to 6.8 mrd. The recrystallization area fraction is larger than or equal to 63.8%, the average grain size is smaller than or equal to 7.7 micrometers, the tensile strength is larger than or equal to 234.6 MPa, the ductility is larger than or equal to 17.9%, and excellent strength and plasticity matching is achieved.

This invention relates to a method for preparing erbium-containing Al-Mg alloys, belonging to the field of aluminum alloy material preparation technology. The invention involves batching materials according to the composition of the erbium-containing Al-Mg alloy, vacuum melting at 740–770℃, and then semi-continuous casting at 720–750℃ to obtain an erbium-containing Al-Mg alloy ingot. The erbium-containing Al-Mg alloy ingot undergoes two-stage homogenization annealing and cooling to room temperature to obtain a homogenized annealed erbium-containing Al-Mg alloy. The homogenized annealed erbium-containing Al-Mg alloy is then uniformly heated to 200–400℃ at a heating rate of 2–10℃ / min for non-isothermal annealing, followed by air cooling to obtain the erbium-containing Al-Mg alloy. This invention, through composite microalloying and non-isothermal heat treatment processes, yields Al-Mg alloys with high strength and excellent elongation. The process is simple and controllable, and the resulting Al-Mg alloy exhibits excellent properties, facilitating large-scale industrial applications.

The application discloses a boride double-scale synergistically reinforced high-manganese steel-based wear-resistant casting and a preparation method thereof, and belongs to the technical field of wear-resistant metal materials and special casting. The casting takes high-manganese steel as a matrix, adopts micron-level TiB2 and nanometer-level ZrB2 to form double-scale boride reinforcing phases, controls the distribution of the reinforcing phases through a powder core wire mesh weaving technology, and forms a metallurgical bonding interface through spray deposition and isothermal annealing. The synergistic improvement of tensile strength, impact toughness and wear resistance is realized. The product is suitable for high-stress wear environments in the mining, metallurgy, building material and other industries, effectively solves the technical pain point that the strength and toughness of traditional high-manganese steel are difficult to be considered, the process is stable and controllable, and differential strengthening can be realized, and the product has industrial application value.

The invention provides a titanium sapphire crystal growth and post-treatment integrated continuous preparation device and method, a heating system of the device is a double-temperature-zone two-section heating body, the temperature gradient in a hearth is controlled through cooperation of an upper-section heating body and a lower-section heating body, and titanium sapphire crystal growth and in-situ constant-temperature annealing are achieved. During crystal growth, Al2O3 and Ti2O3 raw materials are loaded into the crucible, the crucible is integrally placed in the upper-section heating body, the bottom of the crucible is in contact with the heat exchange rod, and parameters such as hearth atmosphere and He gas flow are adjusted to complete crystal growth. And after crystallization is completed, replacing H2 + Ar mixed gas with H2, respectively adjusting the power of the upper and lower heating bodies to form a constant temperature field, and carrying out in-situ constant-temperature hydrogen annealing on the large-size titanium sapphire crystal. The temperature field gradient of crystal growth can be adjusted in real time, the preparation periods of titanium sapphire crystal growth, annealing and the like are shortened, the thermal stress in the crystal is reduced, the Ti < 4 + > concentration in the crystal is reduced, crystal cracking is inhibited, and the optical quality, the FOM value and the yield of the crystal are improved.

The invention discloses a manufacturing method of a heat-resistant zirconium alloy and the heat-resistant zirconium alloy, and belongs to the field of nuclear engineering materials. The manufacturing method of the heat-resistant zirconium alloy comprises the following steps that an alloy blank is provided, wherein the alloy blank at least contains one of 0.5%-3% of Nb, 0.1%-1% of Cr, 0.1%-1% of Cu, 0.1%-1% of Ni, 0.1%-2% of Fe, 0.1%-2% of Mo and 0.1%-2% of V; carrying out isothermal annealing treatment and quenching on the alloy blank in a beta-phase region; then heating to an alpha + beta two-phase region isothermal state to obtain an alpha + beta two-phase structure; and quenching or cooling the alloy subjected to isothermal treatment to an alpha-phase region for heat preservation, and then cooling to room temperature to obtain a heat-resistant zirconium alloy finished product. According to the heat-resistant zirconium alloy, dense second-phase particles exist between alpha-phase crystals, and grain boundary migration is effectively hindered at high temperature, so that the heat-resistant zirconium alloy has good high-temperature structure stability and creep resistance.

The present invention belongs to the technical field of metallurgical materials and relates to a preparation method for a superplastic heterogeneous steel of twinned martensite and nano austenite. The method of the present invention is as follows: molten steel is cast by sub-rapid solidification technology to obtain a casting sample; the casting sample is heated to the full austenitizing temperature range for short-time isothermal annealing, and then air-cooled to 800-900 °C for hot rolling, with a reduction ratio of 25-70%; the hot-rolled steel strip is air-cooled to a temperature range 50-100 °C below the Ms temperature for short-time isothermal tempering, and then immediately water-quenched to obtain the finished steel. The yield strength of the obtained product is 700-900 MPa, the tensile strength > 1000 MPa, the elongation after fracture > 33%, and the product of strength and plasticity is 34-40 GPa%. The present invention significantly expands the dimension of advanced high-strength steel material design, provides new research ideas and directions for the development of new advanced high-strength carbon steels with low cost and high thermal stability, and has broad application prospects.

This invention relates to the field of photomask manufacturing technology and discloses a method for chromium plating using gradient-doped pulsed sputtering photomasks. The method includes cleaning and drying a glass substrate; activating it with an argon-oxygen mixed gas and a radio frequency plasma source to expose active broken bonds on the surface; moving the substrate to a chromium-silicon alloy target; activating a pulsed DC sputtering power supply; and performing a nitrogen linear gradient gas inlet program to deposit a gradient-doped transition layer, constructing a transition band that slowly releases lattice deformation energy; switching to a pure chromium target in situ; co-sponging the pulsed DC and RF power supplies with phase-synchronized triggering modulation to deposit a pure chromium functional layer; bombarding the film surface with a low-energy RF gas using an argon-nitrogen mixed gas; and initiating an in-situ isothermal annealing program for furnace cooling; finally, continuous polishing to obtain the finished product. This invention alleviates lattice mismatch and thermal stress by constructing a compositionally continuous transition band and using dual-power modulated sputtering, thereby improving interfacial adhesion and coating density.

The invention relates to the field of manufacturing of high-quality ultra-high-strength austenitic stainless steel, and discloses a method for inhibiting Luders deformation of high-toughness ultra-fine grain austenitic stainless steel, the method is suitable for metastable austenitic stainless steel, and comprises the following steps: (1) carrying out multi-pass cold rolling on a hot rolled plate subjected to solution treatment, martensite and untransformed austenite in a proper proportion are obtained; and (2) carrying out short-time isothermal annealing on the cold-rolled sheet to obtain a heterogeneous structure consisting of ultra-fine grain reverted austenite and recrystallized coarse grain austenite. The production process is simple, the manufacturing cost is low, based on the reasonable isomerization design of the microstructure, the remarkable Luders deformation in the homogeneous ultra-fine grain austenitic stainless steel can be completely eliminated, and the high strength and high toughness of the material can be guaranteed in cooperation with multiple strengthening and toughening mechanisms. The finished product prepared through the method is the high-quality high-toughness ultra-fine grain austenitic stainless steel, the yield strength is larger than 800 MPa, the tensile strength is larger than 1000 MPa, the total ductility is larger than 40%, and Luders deformation is completely restrained.

The invention provides a Cu-based nanocrystalline alloy strip, which is characterized in that the Cu-based nanocrystalline alloy strip is a Cu-Zr-Al-Gd nanocrystalline alloy strip, and the Cu-Zr-Al-Gd nanocrystalline alloy strip is obtained by taking a corresponding amorphous alloy strip as a precursor and carrying out isothermal annealing treatment under a gas protection condition, the internal organization structure of the amorphous alloy strip is adjusted in the annealing process, and excessive precipitation of the active nano-composite from the surface of the material is inhibited; meanwhile, a structural relaxation process is realized through an annealing process, and various intermetallic compounds form a nanoscale microscopic primary battery due to potential difference, so that the catalytic degradation reaction process is enhanced; and the potential difference of various intermetallic compounds forms the effect of a nanoscale microscopic primary battery, and meanwhile, the grain boundary is reduced due to grain growth, so that electron capture can be greatly weakened, electron transport in the material is further promoted, and the catalytic activity is improved.

The invention provides SUP13Cr high-alloy steel and a heat treatment method thereof, and relates to the technical field of high-alloy steel heat treatment, the heat treatment method comprises the following steps: S1, slow cooling after rolling: carrying out air cooling on hot-rolled steel to below 100 DEG C; and S2, annealing: placing the rolled steel subjected to slow cooling treatment in an annealing furnace, heating to 610-630 DEG C, carrying out heat preservation for 5.0-7.0 h / 100mm, and then discharging and carrying out air cooling. By changing the cooling mode after rolling and performing one-stage isothermal annealing, a tempered martensite structure with a steady state and a moderate hardness value are obtained, the annealing period is greatly shortened, and the capacity of an annealing furnace is released.

The present invention belongs to the field of manufacturing high-strength steel for automobiles, and particularly relates to a high-plating-property and high-strength-ductility-product TRIP steel and a manufacturing method thereof. The chemical composition of the TRIP steel includes, by mass percentage, C: 0.16 - 0.24%, Mn: 1.5 - 2.4%, Si: 0.5 - 1.2%, Al: 0.6 - 1.5%, Ti: 0.008 - 0.08%, Cu: 0.05 - 0.3%, Bi: 0.008 - 0.05%, B: 0.001 - 0.003%, P: below 0.015%, S: below 0.002%, and the balance is Fe. The heating temperature of the slab is 1100 - 1250°C, the finish rolling temperature is 20 - 50°C below the A3 line, the coiling temperature is 500 - 600°C, the dew point of the annealing atmosphere is above -30°C, the critical annealing temperature is 780 - 900°C, the critical annealing holding time is 90 - 600 s, the cooling rate is 10 - 50°C / s, the bainite isothermal annealing temperature is 350 - 450°C, and the isothermal annealing holding time is 40 - 600 s. The present invention can greatly improve the surface oxidation problem of the TRIP steel during annealing on the premise of considering mechanical properties, improve the plating property, and improve the process stability.

The present invention relates to the field of bearing steel detection technology, and specifically to a heat treatment process for bearing steel samples for water immersion ultrasonic testing. The heat treatment process includes the following steps: (1) sampling bearing steel to detect carbide inhomogeneity; (2) heat treating the bearing steel sample according to the test results, and the heat treatment process is selected from normalizing + isothermal annealing process or reciprocating spheroidizing annealing process. After heat treatment, the carbide band of the sample is less than level 2.5 and the average metal grain size reaches level 5 or above. The heat treatment process of the present invention can effectively improve the uniformity and consistency of the internal structure of the bearing steel sample, reduce the generation of echo interference signals during water immersion ultrasonic testing, and ensure the accuracy of the test results.

The application discloses a starch annealing modification method based on ultrasonic assistance, and belongs to the technical field of starch modification. After the starch-containing raw material is conditioned to a moisture content of 20%-35%, ultrasonic treatment is synchronously applied at an annealing temperature window of 50-65 DEG C, a frequency of 20-80 kHz and a power density of 0.5-5 W / mL for 8-20 minutes, the cavitation effect and microjet action of the ultrasonic waves are utilized to accelerate the ordered rearrangement of amylose molecules along the surface of residual natural starch microcrystals, and RS3 type resistant starch is generated; then, cooling, setting and low-temperature drying are carried out. Compared with conventional isothermal annealing, the annealing time can be shortened by 20%-40% through ultrasonic assistance, or the RS3 generation efficiency can be improved under the same time. The application is a pure physical zero-addition process, is suitable for low-protein or gluten-free starch raw materials such as rice starch, corn starch and potato starch, the resistant starch content of the obtained product is greater than or equal to 7%, the GI value is less than or equal to 65, and the RS3 melting temperature is greater than or equal to 120 DEG C. The application provides an efficient annealing path with high industrialization prospect.

The invention discloses an X65 induction elbow with a uniform structure and a preparation method thereof, and the preparation method comprises the following steps: bending X65 pipeline steel, and spraying water for cooling; then the temperature is increased to 930-950 DEG C, heat preservation is conducted, furnace cooling is conducted to 630-650 DEG C, heat preservation is conducted for 2-4 h, and then air cooling Heating to 890-915 DEG C, preserving heat, performing water cooling, putting into a tempering furnace, preserving heat at 610 + / -15 DEG C, and performing air cooling to obtain the induction elbow with a uniform structure. Preheating treatment is conducted in an isothermal annealing mode, the structure is austenitized through temperature rising, and ferrite and pearlite evenly appear on the structure through isothermal annealing; quenching and tempering heat treatment is carried out in a quenching and tempering mode; through the synergistic effect of the bending process, the preheating treatment and the quenching and tempering heat treatment, the microstructure uniformity of the induction bent pipe product is greatly improved, and then the mechanical property uniformity of the induction bent pipe product is improved.

The invention relates to a method for refining ferritic heat-resistant steel grains through reciprocating isothermal annealing, belongs to the technical field of heat treatment of forgings, and solves the problems that the grains generated by the existing heat treatment process after forging are coarse, and the cracking risk of large forgings is easily caused by thermal stress and structural stress. The method comprises the following steps that 1, after being forged, the large forge piece is put into a furnace for heat preservation; 2, heating and austenitizing the forged piece subjected to heat preservation in the step 1, and preserving heat at the temperature; and step 3, cooling the forging austenitized in the step 2 to an annealing temperature, carrying out reciprocating isothermal annealing, cooling and discharging.

This invention discloses a method for preparing and applying an iron-based nanocrystalline magnetic core, belonging to the field of soft magnetic materials technology. The preparation method includes the following steps: preparing a Fe-Si-B-Cu-Nb-(M) system (M=Mo, V) amorphous thin strips of a specific composition; winding the thin strips and then subjecting them to multi-stage isothermal annealing, which includes at least five sequentially increasing isothermal plateaus set near the crystallization initiation temperature. This invention precisely controls the microstructure of the nanocrystals through a multi-stage annealing process. The resulting magnetic core possesses both excellent stress resistance (permeability attenuation rate ≤15% after 10% radial deformation) and extremely high high-frequency permeability (≥20000 at 100 kHz), making it particularly suitable for high-frequency power electronic devices in complex stress environments such as new energy vehicles and 5G communications.

The invention discloses a technological method for machining a bearing steel wire raceway and a steel wire ring machining tool, relates to the field of bearing machining, and solves the problems that an ultrathin steel wire ring is difficult to forge and form, large in machining deformation, unstable in grinding positioning and the like. The technology aims at the 4Cr13 stainless steel ultra-thin steel wire ring (the width of a finished product is 4 mm), batch forging, stepped destressing and composite heat treatment are taken as the core, the 14-step flow comprises bar sawing, integral forging (the material utilization rate is increased to 95% +), isothermal annealing, rough turning / finish turning, subzero treatment (-90 DEG C), multi-cycle rough grinding, additional tempering and the like, and the precision and toughness of the finished product are guaranteed. The tool comprises an upper pressing plate, a positioning ring (double positioning steps), a lower pressing plate and a connecting screw, and is matched with an inner / outer steel wire ring, so that the problem of grinding displacement of the weak magnetic ultrathin part is solved, and the size consistency is improved. After application, the qualified rate of finished products reaches 99%, the roundness of the raceway is less than or equal to 0.007 mm, the service life of the bearing is prolonged by 50% +, and localization of the steel wire raceway bearing is promoted.

The invention belongs to the technical field of special steel rolling, and particularly relates to a rolling method for simultaneously controlling banded structures and bending of low-alloy CrMo and CrNiMo gear steel. According to the rolling method, the heating duration when the heating temperature of a steel billet is controlled to be 1200 DEG C or above accounts for 55.6%-75% of the total heating duration; the water cooling speed of through-water cooling is controlled to be 40-70 DEG C / S, and the water pressure is controlled to be 0.2-0.4 MPa; the retention time of the steel in the double-length cooling bed is at least 40 min; the cooling speed of the double-length cooling bed is 0.14-0.18 DEG C / S; the temperature of an upper double-length cooling bed is controlled to be 650-730 DEG C; and the surface temperature of the steel is controlled to be 290-320 DEG C through lower double-length cooling bed saw cutting. By means of the rolling method, the isothermal annealing state banded structure of the gear steel can be controlled to be within the first level, and meanwhile the steel bending defect can be eliminated.

The application discloses a kind of anchor rod body intelligent production method and anchor rod body based on multiple agents, and the target wall thickness and target rolling force determined by intelligent perforating body are used to carry out perforating treatment to base material, and hollow pipe blank is obtained;The power of each region in hollow pipe blank is adjusted by intelligent annealing body to realize isothermal annealing, and the optimal holding time is calculated, and once cold straightening is carried out using straightening machine;The hollow pipe blank after pickling is obtained after once straightening hollow pipe blank is pickled;The rolling force prediction value and the rolling piece outlet thickness prediction value of each pass obtained by intelligent finish rolling body are used to carry out multi-pass finish rolling forming to the hollow pipe blank after pickling, and rolled anchor rod is obtained;The rolled anchor rod is carried out secondary annealing treatment and secondary straightening;The rolled anchor rod after secondary straightening is carried out fixed-length cutting, cold-rolled rib and thread rolling processing, and anchor rod body is obtained.The application adaptively adjusts process parameters, improves the stability of product quality, and reduces energy consumption under the premise of ensuring annealing effect.

The present invention provides a high-strength hydrogen-embrittlement-resistant stainless steel, comprising, in percentage by mass: C: 0.1%-0.4%, Si: 0.2%-0.5%, Mn: 4.5%-5.5%, P≤0.01%, S≤0.002%, Cr: 0.6%-1.0%, V: 0.1%-0.2%, Nb≤0.08%, B: 0.001%-0.005%, and the balance being Fe. By adding Nb and V microalloying elements on an original stainless steel, austenite grains are refined, and a high-efficiency hydrogen trap is formed in a matrix, thereby improving the resistance of the steel to hydrogen-induced delayed fracture. The stainless steel is processed by means of a hot forming process. Once a steel plate has undergone isothermal annealing, a tempering process is added, the temperature and time of the tempering process are controlled, and finally quenching is performed. Brittle intergranular fracture in the obtained stainless steel is significantly reduced, and the hydrogen embrittlement susceptibility of the stainless steel is effectively decreased.

The invention discloses a method for prolonging the high-temperature creep life of a beta-gamma type TiAl alloy. The method comprises the following steps that 1, an alloy ingot with the nominal composition of Ti-42A1-5Mn (at%) is smelted through vacuum induction; forging the alloy ingot, cooling to obtain a forged blank, and carrying out homogenization solution treatment; and 2, carrying out isothermal annealing treatment on the sample subjected to homogenization solution treatment in the step 1. According to the method, homogenization and isothermal two-step heat treatment are carried out on the beta-gamma type TiAl alloy, so that a beta o phase unfavorable for high-temperature mechanical properties in the alloy is subjected to solid-state phase change and completely disappears, and a newly-separated hard Laves phase coherent with a matrix remarkably inhibits dislocation proliferation and slippage, so that the high-temperature creep life of the alloy is remarkably prolonged.