1928results about "Heat treatment process control" patented technology

The invention relates to the technical field of low-temperature studs and bolts, and discloses a low-temperature stud steel hardenability optimization treatment method which comprises the steps of S1, a pretreatment method, S2, quenching method optimization, S3, tempering method optimization, S4, a post-treatment method and S5, a performance verification method. According to the method, the low-temperature impact stability is remarkably improved, the low-temperature impact energy of the material at about-100 DEG C can stably reach 35 J or above by accurately controlling the proportion of alloy elements and optimizing the heat treatment process (for example, the tempering temperature is increased to 640 DEG C or above and the heat preservation time is prolonged), the low-temperature impact energy is improved by about 20%-30% compared with a traditional process, and the problem that the low-temperature impact performance of the wire rod fluctuates is thoroughly solved; and the service safety in a low-temperature environment is ensured.

The invention relates to the technical field of crossing of artificial intelligence and intelligent manufacturing, discloses a position self-adaptive AI regulation and control method and system for continuous heat treatment of a fastener, and aims to solve the problems of non-uniform temperature field, high hardness dispersion, increase of quenching cracking rate and the like caused by lack of position perception and dynamic compensation lag in the prior art. According to the method, in-furnace coordinates of fasteners are tracked in real time through a high-speed visual positioning device, a thermal demand prediction neural network model with space-time convolution mixed with a gating circulation unit is constructed in combination with the conveying speed, thermal environment parameters and material characteristics, and an instantaneous thermal power instruction is output; the system comprises a high-speed visual positioning module, a motion state monitoring module, a thermal environment sensing module, a thermal demand prediction module and the like, and drives a high-density partitioned infrared heating array to realize millisecond-level local thermal compensation. According to the method, the temperature deviation of the junction of the temperature zones can be controlled within + / -8 DEG C, the hardness dispersion and the cracking rate are remarkably reduced, and the heat treatment consistency and the finished product yield are improved.

The invention relates to the technical field of forging heat treatment, and discloses a forging quenching and tempering method based on intelligent temperature control. The method comprises the following steps: acquiring a real-time temperature time sequence and a temperature distribution characteristic during heat treatment of a forge piece, and executing multi-scale signal decomposition through an optimal signal decomposition primary function and a decomposition depth hierarchy to obtain a multi-scale temperature signal component; and calculating a complexity metric value of the decomposition coefficient to extract randomness characteristics, and screening out a key temperature region coefficient which is most relevant to the structure evolution of the forge piece. The optimal temperature control frequency parameter is determined by combining the material phase change baseline characteristic, the current heat treatment stage state and the randomness characteristic, a temperature field evolution characteristic sequence is reconstructed and is modally decomposed into a slow change component and an accelerated change component, accordingly, the hardening and tempering state type is recognized, a temperature control strategy library is matched to generate a control instruction, and accurate and efficient forging hardening and tempering treatment is achieved. The method solves the problem of lagging structure performance regulation in traditional heat treatment, and improves the stability and consistency of the comprehensive performance of the forge piece.

The invention relates to the technical field of high-strength steel production, in particular to 780MPa-grade forming-enhanced cold-rolled dual-phase steel and a preparation method thereof.The 780MPa-grade forming-enhanced cold-rolled dual-phase steel comprises the chemical components of 0.09%-0.11% of C, 0.25%-0.45% of Si, 1.9%-2.1% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.006% of S, 0.03%-0.05% of Als, smaller than or equal to 0.005% of N, 0.25%-0.35% of Cr, 0.015%-0.025% of Nb, 0.08%-0.12% of Cu and 0.05%-0.09% of Ni, and the ratio of Nb to Cr is 1: 10-1: 12; ceq is equal to 0.38%-0.42%, and the balance is Fe and impurities; the core objective of the invention is to enable the work hardening index n value to be greater than or equal to 0.24 through component collaborative optimization and process precise regulation and control, so that the industrial pain points of insufficient reaming performance and poor formability of the existing 780MPa-grade cold-rolled dual-phase steel are fundamentally solved, and meanwhile, the alloy cost is reduced, and the manufacturability is improved.

The invention relates to the technical field of creep age forming, in particular to an online monitoring and repairing method for creep age forming, which realizes closed-loop intelligent control of a creep age forming process by integrating acoustic emission real-time monitoring and electric pulse online repairing. According to the invention, real-time acoustic emission characteristic parameters are collected and extracted in real time, and damage initiation activities in the material can be captured immediately; the real-time acoustic emission characteristic parameters are compared with the creep aging damage information base in real time, and the current damage can be subjected to early recognition and accurate quantitative diagnosis according to historical damage evolution data, so that the damage type and the damage degree are accurately judged; and an optimal electric pulse parameter combination predetermined for the damage type and the damage degree of the target damage is called as a repair parameter, and electric pulse repair is immediately applied, so that damage self-adaptive accurate intervention is realized. And after repairing is completed, the process automatically circulates and returns to the monitoring step, and whole-process closed-loop control of damage monitoring, damage diagnosis and damage repairing is formed.

The utility model discloses a quenching furnace capable of continuously quenching. The quenching furnace comprises a quenching furnace body and a plurality of continuous conveying trolleys, the quenching furnace body comprises an upper-layer quenching area and a lower-layer continuous conveying area; a heat-insulating door is arranged at one end of the upper quenching area; a signal transmitter is arranged at the lower end of the insulation door; a conveying rail is arranged in the lower-layer continuous conveying area; the continuous conveying trolley is arranged on the conveying track; the continuous conveying trolley comprises a frame body, a plurality of rollers, a lifting assembly and a micro driving motor; the frame body is arranged on the conveying track through a plurality of rollers; a lifting assembly is arranged on the frame body; and a micro driving motor is arranged beside the roller. According to the quenching furnace capable of continuously quenching, it is not needed to wait for each workpiece to independently complete heating, heat preservation, cooling and other procedures like single-piece quenching, through the arrangement of the liftable continuous conveying trolley and the cooperation of a plurality of induction facilities, the production period is greatly shortened, the production efficiency is improved, and the quenching furnace is suitable for mass production of quenching parts.

The invention belongs to the technical field of rolling bearing manufacturing, and discloses a preparation method of a high-precision robot turntable bearing, which comprises the following steps: applying a static load simulating a preset working load to a bearing ring workpiece subjected to heat treatment, and executing a set of closed-loop acoustic vibration treatment on the workpiece in a state of keeping the static load, the processing can dynamically track the resonant frequency of the workpiece to update excitation, can monitor acoustic response characteristic parameters of the workpiece in real time, and automatically terminates when the time change rate of the parameters meets a stable condition. According to the method, the specific directivity is provided for the stress release process driven by acoustic vibration energy, so that an original disordered residual stress field in a workpiece forms an optimized form capable of actively adapting to future working loads, and the problem that the static geometric precision and the dynamic service precision of a bearing are inconsistent in a traditional process is solved.

The invention provides a seamless steel pipe for a hollow anchor rod and a strength regulation and control method thereof. Alloy steel round steel is heated and then subjected to hot piercing to be manufactured into a hollow pipe blank; the hollow pipe blank is subjected to spheroidizing annealing treatment and then cooled, and a first treated steel pipe is obtained; wherein the ferrite grain size D1 of the first treated steel pipe is calculated according to a spheroidizing annealing grain size model; the first treated steel pipe is subjected to cold finish rolling forming and cleaned to obtain a second treated steel pipe; the ferrite effective grain size Ddef of the second treatment steel pipe is calculated according to the cold deformation grain refinement model; recrystallizing and annealing the second treated steel pipe to obtain the seamless steel pipe; the ferrite grain size D2 of the seamless steel pipe is calculated according to the recrystallization grain evolution model; the yield strength Rp0.2 of the seamless steel pipe is calculated according to a strength model; reverse design of the yield strength of the seamless steel pipe is achieved, and meanwhile it is guaranteed that the seamless steel pipe has good plasticity.

The invention relates to the technical field of aluminum alloy profile processing, and particularly discloses a super-long thin-wall aluminum alloy profile anti-deformation vertical quenching method which comprises the following steps: S1, determining mechanical parameters, and obtaining the maximum equivalent buckling axial pressure P of a to-be-quenched aluminum alloy profile; s2, determining the maximum constraint length of a single section: further calculating the maximum allowable length of the single constraint section of the to-be-quenched aluminum alloy section; S3, determining a minimum constraint section; S4, carrying out solid solution quenching: equally dividing the to-be-quenched aluminum alloy section according to the minimum constraint section N, and carrying out section marking in the radial direction from the bottom to the top, the adjacent segment marking positions and the top of the sectional material are restrained and fixed; and after fixation, solid solution quenching is carried out, and after solid solution quenching is completed, the profile is taken out. The vertical quenching device is suitable for vertical quenching requirements of various ultra-long thin-wall aluminum alloy profiles with complex sections, and the profiles are effectively prevented from being deformed in the vertical quenching process.

The invention discloses a heat treatment device and method for stainless steel machining, and relates to the technical field of pipeline quenching, the heat treatment device comprises a cooling mechanism, the cooling mechanism comprises a box body, and the box body is filled with cooling liquid; the pipe body inside and outside uniform quenching mechanism is connected with the cooling mechanism; cooling liquid is supplied into the ceramic tube through the liquid temperature control mechanism in the mounting tube by means of the liquid supply device, is sprayed to the cone from the bottom end of the ceramic tube, uniformly covers the inner wall of the stainless steel tube after being diffused by the cone, and is in full contact with a quenching area of the inner wall to realize cooling; meanwhile, oxide on the inner wall of the stainless steel pipe can be stripped through the impact effect of the cooling liquid, and cooling uniformity is guaranteed. Besides, the flowing of the cooling liquid can avoid temperature rise caused by retention in the stainless steel pipe, so that the cooling effect of the quenching position is prevented from being influenced, the lifting of the liquid temperature control mechanism in the pipe is convenient for subsequent installation and replacement, and the processing efficiency is effectively improved.

The invention relates to a preparation method of bainite steel with high toughness and strength at low temperature, and the strength and toughness of the bainite steel at low temperature are improved by designing process parameters and steel ingot components. The bainite steel with high toughness and strength at low temperature is finally obtained by designing the components of the steel ingot, avoiding the addition of elements such as nickel, molybdenum and vanadium, reducing the material cost and the processing difficulty and accurately controlling the cooling rate of heat treatment. The prepared bainite steel is composed of strip-shaped bainite and thin strip-shaped retained austenite, and the volume fraction of the retained austenite is 5-10%. The tensile strength is not lower than 1240 MPa, the normal-temperature impact is not lower than 120 J, and the impact toughness at-40 DEG C is not lower than 80 J.

The invention discloses an efficient and low-cost high-strength steel plate for a 1300MPa-grade low-temperature engineering structure and a manufacturing method of the high-strength steel plate, and belongs to the technical field of low-carbon microalloyed steel production. Optimized steelmaking, heating, rolling, pre-straightening, relaxation, controlled cooling, hot straightening and tempering processes are adopted, an ultra-fast cooling and laminar cooling mode is adopted for controlled cooling, chemical components of the steel plate contain Ce, and finally the problems that the 1300MPa-level hot-rolled steel plate with the thickness of 10-50 mm produced through an online cooling process is low in toughness, high in yield ratio, low in flaw detection qualification rate and uneven in plate shape are solved.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The invention discloses a copper wire annealing temperature gradient control device which comprises a box body, and an inert gas supply source, an induction heating power supply, a control unit and a cooling water supply source are arranged outside the box body. The front end of the box body is provided with a door body, a left hinge and a right lock catch. A connecting seat is arranged at the bottom in the box body, a mounting plate is arranged at the middle upper part of the box body, and a vertical guide rail column is detachably mounted between the connecting seat and the mounting plate; clamping structures are arranged at the upper and lower ends of the base; and copper wires are detachably mounted on the clamping structures. And two ends of the electromagnetic heating coil penetrate out of the box body and are connected with an induction heating power supply. And the top of the base is connected with the take-up and pay-off equipment through a stay wire. Two temperature measuring assemblies are arranged on the box wall and located above and below the electromagnetic heating coil respectively. The lower end of the side wall of the box body is connected with an inert gas supply source, and the upper end is provided with an exhaust pipe with a valve and an online gas detector. The side wall of the box body is connected with an inclined bent pipe and an emptying pipe with a valve, and a water inlet pipe penetrates through the side wall of the box body and is connected with the box body.

The application discloses a low-carbon-equivalent 355MPa grade normalized rolled thick plate organization uniformity control method, wherein the temperature of the billet before charging is less than or equal to 400 DEG C, the temperature of the soaking furnace is 1130-1150 DEG C, the time of the soaking section is 45-55 minutes, the total furnace time is 170-185 minutes, the second opening temperature of the billet is 880-940 DEG C, the finishing rolling is 6-8 passes, the cumulative reduction is 60-70%, and the final rolling temperature is 860-900 DEG C; the steel plate cooling is realized by adopting a laminar flow cooling system, the full-automatic water pouring control cooling mode is adopted, the water inlet temperature is 720-740 DEG C, the red temperature is 640-660 DEG C, and the surface temperature of the steel plate after cooling is monitored. The head and tail and the full-thickness organization type of the normalized rolled steel plate are all 'ferrite + pearlite' organizations, the grain size level is all above 9.0, there is no obvious banded structure and no bainite structure, and the problem of the organization difference of the 355MPa grade thick plate product caused by the normalized rolling is solved.

The invention discloses a heating monitoring method for a stainless steel seamless tube in a heat treatment furnace, which belongs to the technical field of metal heat treatment and specifically comprises the following steps: acquiring an electromagnetic induction signal of a steel tube in rotation advancing in real time and binding spatio-temporal information; kinematics inversion is carried out on the spatio-temporal information based on the movement speed of the steel pipe, and an electromagnetic parameter evolution track of each physical point on the surface is reconstructed; continuously deviated abnormal points are identified based on the evolution trajectory and clustered to extract electromagnetic characteristics of the heating abnormal area, temperature deviation is obtained through a preset electromagnetic-temperature mapping model, and a compensation instruction is generated; and predicting space-time coordinates of the abnormal area reaching the next heating area, and driving the corresponding independent heating unit to execute dynamic energy compensation in the matched time window. Real-time, global and accurate sensing and closed-loop regulation and control of the heating uniformity of the moving workpiece are achieved, the uniformity and stability of heat treatment quality are remarkably improved, and energy consumption is reduced.

The invention discloses automobile variable-cross-section precise thin-wall steel pipe heat treatment equipment which comprises a rack, a liquid collecting pool is formed in the rack, a traction piece is installed at the top of the rack in a transmission mode, guide frames are fixedly installed on the two sides of the inner wall of the rack, and lifting assemblies are installed on the surfaces of the guide frames through the traction piece in a transmission mode. The invention relates to the technical field of precise steel pipe heat treatment. According to the heat treatment equipment for the automobile variable-cross-section precise thin-wall steel pipe, after an operator sleeves the thin-wall steel pipe on the outer side of the inner supporting piece and completes clamping operation of inner supporting and outer clamping, the motor and the positioning seat drive the two sets of clamping pieces to clamp the two ends of the steel pipe correspondingly, and the clamping stability is guaranteed. The bottom supporting plate at the bottom of the sliding frame provides stable supporting for the positioning base, the positioning base and the sliding table fix the two sets of clamping pieces correspondingly, a clamping structure with the two ends supported is formed, the weight of the thin-wall steel pipe is effectively dispersed, the problems that a clamp shakes and the steel pipe falls off in the lifting or sliding process are solved, and the operation stability of equipment is improved.

The invention discloses an anti-fatigue strengthening special machine, relates to the technical field of fatigue strengthening, and aims to solve the problems of inconstant strengthening pressure, insufficient workpiece deformation inhibition and poor strengthening uniformity caused by incapability of tracking a normal direction in anti-fatigue strengthening of a complex contour sample. The ultrasonic rolling strengthening device comprises an ultrasonic rolling strengthening executing mechanism and an auxiliary supporting mechanism. The ultrasonic rolling strengthening executing mechanism comprises a first air cylinder, a pressure sensor used for detecting and feeding back axial acting force in real time is installed at the end of a piston rod of the first air cylinder, and the pressure sensor is fixedly connected with an ultrasonic rolling strengthening executor and used for receiving propulsive force provided by the first air cylinder and force signals fed back by the pressure sensor. Ultrasonic frequency electric vibration is converted into mechanical vibration, a rolling ball is installed at the output end of the ultrasonic rolling strengthening actuator, and the rolling ball is in strengthening contact with the surface layer of the workpiece under the combined action of constant normal pressure and ultrasonic vibration; the auxiliary supporting mechanism comprises a second air cylinder, and a rolling body is installed at the end of a piston rod.

The invention relates to the technical field of research and development of low-temperature bolt steel, and discloses a low-temperature impact performance control process for low-temperature bolt steel. Comprising the steps that S1, in the steelmaking refining stage, purity and uniformity control is conducted, S2, casting blank homogenization treatment is conducted, stress relief and structure regulation are conducted, S3, a heat treatment core process is conducted, structure and toughness balance regulation is conducted, and S4, online detection and dynamic feedback are conducted, and performance stability is guaranteed. By accurately controlling the element proportion of carbon (C), silicon (Si), manganese (Mn), chromium (Cr) and molybdenum (Mo) in steel and combining with an optimized heat treatment process (such as 860 DEG C oil quenching and 640-650 DEG C high-temperature tempering, and the heat preservation time is prolonged to 120 minutes or more), the V-shaped notch impact energy of the material in the environment of-101 DEG C stably reaches 35 J or more, the impact energy of part of samples can reach 50 J or more, and the impact energy of the part of samples can reach 50 J or more. The problem that the low-temperature impact performance is insufficient after wire hardening and tempering is thoroughly solved, and it is ensured that the brittle failure resistance of the bolt is remarkably improved in the ultralow-temperature environment.

The invention relates to an anti-overtemperature control method and system for an aluminum alloy sheet heating furnace, and the method comprises the following steps: arranging a plurality of thermocouples in the length direction and the width direction in the heating furnace, forming a temperature matrix, and collecting the temperature distribution data of a working area in the furnace in real time; a transient heat conduction prediction model of the aluminum alloy sheet is established, and the model is combined with physical property parameters of aluminum alloy and comprises the relation that the specific heat capacity, the heat conductivity coefficient, the density and the emissivity change along with the temperature; based on the temperature matrix and the transient heat conduction prediction model, predicting a temperature rise curve of the thin plate in a future set time; and when the predicted temperature exceeds the preset safety threshold value, the heating power or the start-stop state of the corresponding heating area is adjusted in advance, and active anti-overtemperature control is achieved.

The invention relates to the technical field of guide arm spring flat steel, and discloses a guide arm spring flat steel surface crack control technological method.The guide arm spring flat steel surface crack control technological method comprises the following technological methods of S1, smelting technology optimization, S2, continuous casting technology control, S3, rolling technology optimization and S4, quality detection and feedback adjustment. In the smelting stage, through slag stopping and tapping, LF furnace long-time refining white slag making (the alkalinity is 5.0-7.0, and the white slag retention time is longer than or equal to 30 min) and vacuum deep degassing (the vacuum degree is smaller than or equal to 67 Pa, and the retention time is longer than or equal to 15 min), the content of gas (the hydrogen content is smaller than or equal to 1.5 ppm) and the content of inclusions in steel are remarkably reduced, component fluctuation in the later period is avoided through accurate use of a diffusion deoxidizing agent (the use amount is larger than or equal to 80 kg / furnace), a pure molten steel foundation is laid for the follow-up process, and the production cost is reduced. And crack inducements caused by inclusion and gas are reduced from the source.

The invention discloses a silicon steel annealing furnace air-fuel ratio dynamic optimization control method based on multi-mode perception. The method comprises the steps that the oxygen concentration and the carbon monoxide concentration in smoke, the uniformity standard deviation of a hearth temperature field, the high calorific value of fuel gas, the fuel volume flow and the combustion-supporting air volume flow are collected in real time; the current actual air-fuel ratio is calculated according to the flow data; the efficiency index and the state evaluation index of the current combustion system are calculated in real time, dynamic optimization is carried out with the maximum efficiency index and the minimum evaluation index as double targets, and an optimal excess air coefficient set value is solved; the optimal excess air coefficient set value is restrained and compensated; and a combustion-supporting air flow set value is calculated, and a combustion-supporting air door or an adjusting valve is controlled to act after fine adjustment, so that precise control is completed. According to the method, multi-mode sensing is combined with a dynamic optimization algorithm, closed-loop optimization control over the air-fuel ratio is constructed, fine control over the air-fuel ratio is achieved, the response time is shortened, and efficiency and quality are both considered.

The invention discloses a high-uniformity extra-thick 420MPa-grade maritime work steel plate for an extremely low temperature environment and a manufacturing method thereof, and belongs to the field of ferrous metallurgy. The steel plate comprises the following chemical components in percentage by mass: 0.03%-0.07% of C, 0.15%-0.35% of Si, 1.40%-1.70% of Mn, less than or equal to 0.002% of S, less than or equal to 0.010% of P, 0.015%-0.045% of Als, 0.03%-0.05% of Nb, 0.10%-0.30% of Cr, 0.010%-0.020% of Ti and the balance of Fe and inevitable impurities, and the carbon equivalent CEV is less than or equal to 0.36%. The manufacturing process comprises the steps of smelting, continuous casting, blank heating, controlled rolling, controlled cooling and stacking slow cooling. The thickness of the obtained steel plate is 50-100 mm, the yield strength is larger than or equal to 420 MPa, the impact energy at the temperature of-60 DEG C is larger than or equal to 200 J, the strength difference of the whole plate is smaller than or equal to 40 MPa, and the steel plate has high strength, high toughness, good weldability and high uniformity and meets the requirement for the deep and far sea extremely-low-temperature environment.

The invention relates to the technical field of heat treatment of steel for high-performance heading machine tools, and discloses an ultra-fine grain solid-phase regulation and control process for improving the structure uniformity of alloy steel, which comprises the following steps: collecting electrical parameters of an induction loop and identifying sudden change of parameters of a phase change point to determine a phase change leading edge position; triggering pulse disturbance heating at a preset depth to generate transient volume dislocation stress, breaking core carbide segregation and driving stress extreme values to gather towards the center; controlling the temperature rise rate to make the nucleation rate higher than the diffusion rate so as to form a dispersed crystal nucleus; according to the method, the phase change transient volume dislocation strain field is used for blocking the continuity of the net-shaped hard and brittle phase, the structure heredity of the large-scale section steel is eliminated, the total cross-section structure is highly homogenized, equiaxed crystals are ultra-refined, and the intergranular fracture resistance of the material in the service environment is enhanced.

The invention discloses a method for preparing bainite steel through multi-element microalloying, and belongs to the technical field of advanced steel and iron materials. The method comprises the following steps that a forged steel ingot is subjected to first austenitizing and cooling treatment, and a martensite matrix is obtained; and then secondary phase precipitation treatment, secondary austenitizing treatment and cooling are sequentially carried out, and the bainite steel is prepared. According to the invention, an innovative heat treatment process path of martensite initial structure-medium-temperature second phase precipitation-short-time austenitizing-salt bath isothermal bainite transformation is constructed, and the synergistic effect of microalloy elements such as V, Nb, Ti and B is combined, so that the heat treatment process has the advantages that the heat treatment efficiency is greatly improved on the premise of not depending on precious alloy elements such as Cr and Ni; and the superfine bainite steel which is uniform in structure and excellent in comprehensive performance is successfully prepared.

The invention belongs to the technical field of metallurgy, and discloses an economical large-thickness steel plate and a manufacturing method thereof. The steel plate is formed by smelting the following components in percentage by mass: 0.10%-0.16% of C, 0.15%-0.45% of Si, 1.30%-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.001% of S and the like, and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of primary smelting, refining, continuous steel casting, heating and controlled rolling. According to the method, the high-compactness continuous casting slab refining and continuous casting technology is combined with the controlled rolling technology with microalloy carbonitride point enrichment nucleation as the core, a grain refined mixed structure is obtained, the problems that the compression ratio is low and grains are coarse when a large-thickness steel plate is produced through a continuous casting slab are solved, the thickness of the produced steel plate reaches 100-150 mm, and the yield of the steel plate is improved. The internal quality, strength and low-temperature toughness are excellent, and the continuous casting billet is produced by controlling rolling, so that the economical efficiency is good.

The present invention relates to an X70 pipeline steel of extremely low-temperature high toughness for transport of CO2 and a manufacturing method therefor. In addition to Fe and unavoidable impurities, the X70 pipeline steel further comprises the following chemical components in percentage by weight: C: 0.03-0.08%, Si: 0.10-0.30%, Mn: 0.8-1.5%, P≤0.0070%, S≤0.0012%, Ni: 0.05-0.50%, Cr: 0.1-0.6%, Mo: 0.01-0.08%, Nb: 0.02-0.05%, V: 0-0.03%, Ti: 0.005-0.020%, Ca: 0.0010-0.0035%, all aluminum Alt: 0.010-0.040%, B≤0.0005%, O≤0.0030%, and Re: 0.0001-0.0030%, Re being Ce and La.

The invention discloses high-performance bridge steel and a production method thereof, and belongs to the technical field of ferrous metallurgy. The bridge steel comprises the following chemical components in percentage by mass: 0.09%-0.11% of carbon; silicon: less than or equal to 0.55%; 1.4%-1.6% of manganese; less than or equal to 0.018% of phosphorus; sulfur: < = 0.005%; 0.15% to 0.20% of niobium; less than or equal to 0.08% of vanadium; 0.006% to 0.03% of titanium; 0.01 to 0.02 percent of chromium; 0.01% or less of nickel; less than or equal to 0.3% of copper; 0.01% to 0.045% of aluminum; less than or equal to 0.3% of molybdenum; not more than 0.008% of nitrogen; and the balance of iron and inevitable impurities. According to the high-performance bridge steel and the production method thereof, by optimizing the component design and the production process, production of the bridge steel with high strength, low yield ratio, high toughness and good welding performance can be achieved.

The invention discloses an annealing treatment method for low-carbon steel, and relates to the technical field of metallurgical engineering. Comprising the following steps that steel to be annealed is placed in an annealing furnace with the preset temperature to be subjected to annealing treatment, and the annealing furnace comprises a heating section, a heat preservation section and a furnace cooling section which are continuously arranged in the moving direction of the steel; the preset temperature of a heating area is 690-715 DEG C, the preset temperature of a heat preservation area is 750 DEG C, and the preset temperature of a furnace cooling area is 730-525 DEG C; and the residence time of the steel in a heating section, a heat preservation section and a furnace cooling section is adjusted, the residence time of the steel in the heating section is 1.3-1.6 h, the residence time of the steel in the heat preservation section is 3.0-3.6 h, the residence time of the steel in the furnace cooling section is 2.9-3.5 h, and the cooling rate is 64-77 DEG C / h. By means of the method, the plasticity and toughness of the large-specification low-carbon steel can be remarkably improved, and the cold forging machining performance of the large-specification low-carbon steel is ensured.

The invention relates to a heat treatment method and device, computer equipment, a computer readable storage medium and a computer program product. The method is applied to the roller kiln, and at least one sagger and a plurality of temperature control devices are arranged in the roller kiln. The method comprises the following steps: acquiring space temperature distribution data of the roller kiln; according to the space temperature distribution data, target material distribution of the materials to be subjected to heat treatment in the roller kiln is determined, and target temperatures corresponding to the temperature control devices are configured, so that the heating uniformity of the materials to be subjected to heat treatment in the heat treatment process is higher than a preset uniformity threshold value; wherein in the heat treatment process, the filling amount of the to-be-heat-treated material in each sagger is determined based on the target material distribution, and the sagger filled with the to-be-heat-treated material is subjected to heat treatment in the roller kiln with the temperature configuration completed. By adopting the method, the particle size distribution range of products processed by the roller kiln can be narrowed.