617 results about "Slow cooling" patented technology

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2360MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. After a Mo-V high-carbon component system is rolled and spun into a wire rod, the wire rod is subjected to on-line molten salt weak quenching toughening treatment, so that the wire rod is subjected to front-section molten salt treatment to be quickly cooled, enters a bainite and sorbite mixed phase region from an austenite state, and is subjected to high-temperature heat treatment to form a high-strength complex-phase hot-rolled wire rod; the method comprises the following steps: firstly, carrying out heat treatment on residual austenite to form a structure mainly comprising bainite and sorbite, then carrying out later-section molten salt treatment, increasing the temperature of molten salt, promoting decomposition and conversion of unconverted residual austenite into sorbite, carrying out isothermal tempering, and finally, carrying out roller way slow cooling to prepare a hot-rolled wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered bainite and tempered sorbite, the method has the advantages that the structure toughness can be regulated and controlled on line, the tensile strength is 1574-1627 MPa, the percentage reduction of area is 28-33%, the mechanical property fluctuation is reduced, the material cost and the production efficiency are both considered, the ultra-high-strength stranded wire can be produced without off-line heat treatment, and the wire breaking risk is reduced.

The invention belongs to the field of dies, and particularly relates to a cam cover die-casting die with a spiral cooling structure, a die table mechanism comprises a lower die table and an upper die table which are combined, and a lower die core and an upper die core which are matched with each other are arranged in the lower die table and the upper die table; the pouring mechanism comprises a pouring end seat arranged on the upper mold table, a pouring channel penetrating through the upper mold core is formed in the pouring end seat, and the other end of the pouring channel penetrates into a closed cavity of the lower mold core and the upper mold core; the track mechanism comprises a track table arranged on the outer side of the cavity; the multi-layer structure of the spiral pipe is in direct contact with the outer wall of the cavity, the spiral flowing path of a cooling medium is combined, the heat exchange area and cooling uniformity are increased, the casting deformation risk is reduced, a temperature sensing end base integrated temperature sensor monitors the temperature of the cavity in real time, and the flow of the cooling medium is dynamically adjusted in cooperation with a deformation piece driven by an air bag piece. And intelligent control of slow-cooling anti-cracking in a high-temperature area and rapid-cooling shaping in a low-temperature area is realized.

The invention discloses a wire rod for 2000MPa-level prestressed steel with the large specification of 15mm and a preparation method of the wire rod, and belongs to the technical field of metal material preparation and metal pressure processing. The invention aims to develop a 15mm large-specification high-performance prestressed steel wire rod with a novel component system and a matched production process thereof, the tensile strength of the wire rod is greater than or equal to 1200MPa, and the percentage reduction of area (after aging) is greater than or equal to 30%; the product can be used as a large-specification high-strength high-speed rail plate prestressed steel wire and a 1960-2000MPa-grade high-performance prestressed steel wire and a steel strand. According to the method, the technological process of molten iron pretreatment, converter smelting, LF refining, RH refining, square billet continuous casting, casting billet slow cooling pit slow cooling, casting billet heating, high-pressure water descaling, controlled rolling and controlled cooling and PF line heat preservation channel slow cooling and a complete and controllable production process system are adopted; and the harsh requirements of large-size high-performance prestressed materials of modern important projects on the performance of the wire rod are met.

The invention discloses a selective laser melting high-temperature preheating device with high-precision temperature control. The selective laser melting high-temperature preheating device comprises a laser; a forming cylinder; the piston is arranged in the forming cylinder in a lifting manner; the mounting plate is arranged on the piston, and a first accommodating groove is formed in the top surface of the mounting plate; the heating plate is arranged in the first accommodating groove and is provided with a heater; the forming base plate is arranged above the heating plate and is provided with a temperature sensor; the cooling mechanism is used for cooling the piston, the mounting plate, the heating plate and the forming base plate; a heat insulation plate is arranged between the bottom wall of the first containing groove of the installation plate and the heating plate. The invention further discloses a selective laser melting high-temperature preheating method with high-precision temperature control. Through the mode, the problem of cracking caused by overlarge temperature gradient in the SLM forming process is solved, the problems of low preheating temperature, low cooling speed and inaccurate temperature control of the formed substrate are also solved, the powder laser absorptivity can be improved to a certain extent, the scanning speed is increased, and the production efficiency is improved.

The invention discloses a novel process for realizing online softening and improving cold heading performance of SCM435 series cold heading steel, and relates to the technical field of cold heading steel processing. The invention discloses a novel process for realizing online softening and improving the cold heading performance of SCM435 series cold heading steel. According to the method, S1, steel billet continuous casting forming, S2, steel billet precise heating, S3, low-temperature rolling molding, S4, wire rod standard spinning, S5, stelmor cooling and S6, heat preservation vestibule slow cooling are carried out, the uniformity of the process performance is remarkably improved, by innovatively optimizing the spinning coefficient and the roller way speed, it is fundamentally guaranteed that the disc shape is neat, the heat dissipation conditions of all positions of the wire rod in a slow cooling vestibule are consistent, and the heat dissipation efficiency of the wire rod is improved. Therefore, uniform transformation of a whole-roll structure and a same-circle structure is achieved, the consistency of cold heading performance is greatly improved, the cracking risk in the cold heading process is effectively reduced, the technology is remarkable in energy-saving and consumption-reducing effect, rolling waste heat is fully utilized for on-line softening, the traditional off-line reheating and annealing procedure is completely omitted, and energy consumption can be saved by about 30% or above.

The manufacturing method comprises the following steps: rolling and spinning high-carbon and high-silicon components of Nb-Mo to form a wire rod, and then carrying out online molten salt strong isothermal toughening treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; and then carrying out rear-section molten salt treatment, reducing the circulation volume of molten salt, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out slow cooling through a roller way, so as to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, ferrite and fused sorbite, according to the invention, abnormal tissues can be inhibited, the tensile strength is 1566-1616 MPa, the percentage reduction of area is 33%-38%, and the production efficiency is considered, so that the ultrahigh-strength stranded wire can be produced without off-line heat treatment, and the risk of wire breakage is reduced.

A preparation method of the outdoor high-strength polyester fiber with the radiation refrigeration function comprises the following steps that titanium dioxide, silicon dioxide, silicon carbide and zirconium phosphate are blended and ground in proportion and then dispersed in an acetone solution, a dispersing agent is added, and nano-particle dispersion liquid is formed through ultrasonic treatment; mixing the nano-particle dispersion liquid with the polyester chips; feeding the mixed composite material into a screw extruder for melt blending to form a spinning solution; after being accurately metered by a metering pump, the spinning solution is extruded by a spinneret plate to form fiber tows, and the spinneret plate is provided with a slow cooling and heating device; and performing post-treatment on the fiber tows to obtain the high-strength polyester fibers. According to the invention, a specific combination of titanium dioxide, silicon dioxide, silicon carbide and zirconium phosphate is selected, and a specific slow cooling technology and high-power stretching shaping are matched, so that the fiber has excellent radiation refrigeration performance and mechanical strength, and can be widely applied to the fields of outdoor clothing, awning cloth, car clothing and the like.

The invention provides a vertical position welding method for bridge steel. The vertical position welding method comprises the steps that 1, a groove is manufactured, specifically, the X-shaped groove without a truncated edge is manufactured in a vertical position mode through a flame cutting technology; and the groove is polished and derusted according to requirements. 2, preheating, wherein the bridge steel is preheated to 75 DEG C in an electric heating mode; and 3, welding, wherein solid welding wire argon-rich mixed gas shielded welding is adopted for vertical position welding. And 4, post-weld heat treatment is conducted, specifically, after welding is completed, post-heat treatment is conducted at 200-250 DEG C through a crawler-type heater, and slow cooling is conducted to the room temperature after heat preservation is conducted for 3 hours. By researching and developing a welding material and a welding process matched with the Q890qE high-strength bridge steel, the technical problem of quality of a Q890qE vertical position butt welding seam is solved. Welding forming is stable, efficiency is high, deformation is small, the appearance is good, strength and weather resistance are balanced, the service life is long, and economical efficiency and environment friendliness are both considered; the method is especially suitable for engineering scenes with strict requirements on strength, toughness and durability such as long-span bridges and alpine region bridges, and has remarkable economic advantages and social value.

The invention relates to the technical field of silica gel injection molding temperature control, in particular to a temperature control system and process for liquid injection molding of a silica gel toy. The process comprises the following steps: S1, according to three-dimensional model data of a silica gel toy, automatically identifying geometric feature information of the silica gel toy; s2, setting initial temperature parameters of each injection molding stage on the basis of the geometrical characteristic information in combination with physical characteristics of the liquid silica gel; s3, in the injection period, based on the initial temperature parameters, micro-heating / mold temperature maintaining / micro-cooling is conducted on different areas of the silica gel toy; s4, in the pressure maintaining period, when the liquid silica gel is filled to the preset filling proportion, the mold temperature of the multicolor injection molding material flow interface area is reduced to the freezing temperature; s5, in the main vulcanization period, a self-adaptive temperature adjustment strategy is executed on the thick-wall area and the thin-wall area; and S6, in the cooling and demolding period, a corresponding rapid cooling strategy / slow cooling strategy is executed on the thick-wall area and the thin-wall area. The size stability and the assembly precision of the complex thin-wall silica gel component are remarkably improved.

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.

According to the filler wire welding method based on the composite laser, the first laser beam and the second laser beam which are different in wavelength can be irradiated to the welding seam of the to-be-welded aluminum alloy workpiece through the composite laser welding head, and light spots, acting on the to-be-welded aluminum alloy workpiece, of the two laser beams partially coincide or do not coincide; the two light spots are distributed front and back in the welding direction. When the light spot of the first laser beam is in the front and the light spot of the second laser beam is in the rear, the first laser beam can be used for preheating, so that the welding wire melting efficiency can be improved, the reflectivity of aluminum alloy to the second laser beam is reduced, and welding seam forming is improved. When the light spot of the first laser beam is in the rear and the light spot of the second laser beam is in the front, the first laser beam can be used for slowly cooling a welding pool / performing post-heat treatment on a welding seam, so that welding defects are reduced. It can be seen that the welding quality of the to-be-welded aluminum alloy workpiece is improved by means of characteristic cooperation and function complementation between the two kinds of lasers of different wave bands.

The invention relates to a hot-rolled wire rod for a 2300MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after high-Si and high-carbon components containing trace Nb are rolled and spun into a wire rod, the wire rod is subjected to online molten salt isothermal toughening treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; the method comprises the following steps: carrying out hot rolling on the austenite, carrying out post-section molten salt treatment, reducing the molten salt temperature and the molten salt circulation amount, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out roller way slow cooling to prepare a hot-rolled wire rod of which the microscopic structure comprises tempered sorbite, ferrite and fused sorbite. According to the invention, the cross-section shrinkage rate is 35%-40%, the mechanical property same-circle difference is less than or equal to 48MPa, and the material cost and the production efficiency are both considered, so that off-line heat treatment is not needed, and the efficient and stable production of the ultrahigh-strength stranded wire is promoted.

The invention provides a rolling method of cathode flat steel, which comprises the following steps: firstly, heating a casting blank to obtain a heated blank, then carrying out surface descaling on the heated blank, and carrying out multi-pass rough rolling to obtain an intermediate blank; the heating treatment comprises a preheating section and a soaking section; the heating treatment is specifically a heating treatment process for controlling the austenite grain size of the casting blank; the multi-pass rough rolling comprises multi-pass rough rolling of which the reduction rate is sequentially reduced; and carrying out multi-pass finish rolling on the intermediate billet obtained in the previous step, carrying out on-line cooling, and then carrying out stacking slow cooling to obtain the rolled and formed cathode flat steel. According to the method, directional improvement of the conductivity of the electrolytic aluminum cathode flat steel is achieved through rolling process optimization, heating under a rolling path of a low-temperature ferrite area and rolling pass reduction distribution design are focused, the ferrite grain size and the conductive texture of a material are cooperatively regulated, the normal conductivity of the cathode flat steel is improved, and the conductivity of the cathode flat steel is improved. And a core material support is provided for reducing ineffective current loss in the electrolytic aluminum industry.

The invention discloses a rolling manufacturing method of low-decarburization medium-chromium round steel for a caterpillar track link and a product of the rolling manufacturing method, and belongs to the technical field of alloy steel rolling. The method comprises the following steps: smelting molten steel, wherein the molten steel comprises the following components in percentage by mass: 0.28-0.34% of C, 0.15-0.35% of Si, 0.50-0.85% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.80-1.10% of Cr, less than or equal to 0.30% of Ni, 0.10-0.30% of Mo, less than or equal to 0.30% of Cu, 0.010-0.060% of Al and the balance of Fe and impurities; lF refining, RH vacuum degassing (the time is longer than or equal to 20 min, and the hydrogen content is smaller than or equal to 1.5 ppm), electromagnetic stirring continuous casting (the superheat degree is 15-25 DEG C), slow cooling (longer than or equal to 12 h), segmented heating (the total time is shorter than or equal to 200 min, and the residual oxygen content is lt, 3%), multi-stage high-pressure water descaling (the pressure before finish rolling is 30-35 MPa) and hot continuous rolling (the compression ratio is larger than or equal to 6) are conducted. The total decarburized layer depth of the obtained round steel is smaller than or equal to 0.30 mm, and the round steel has high hardenability, excellent mechanical property and low surface defect rate and is suitable for heavy-load components such as a hydraulic excavator caterpillar track link.

The invention discloses steel for a 420 MPa grade arctic circle oil and gas exploitation platform and a preparation method of the steel. The steel plate comprises the following chemical components in percentage by weight: 0.06%-0.12% of C, 0.15%-0.35% of Si, 1.00%-1.60% of Mn, less than or equal to 0.008% of P, less than or equal to 0.008% of S, 0.025%-0.060% of Nb, 0.030%-0.080% of V, 0.020%-0.040% of Al, 0.010%-0.020% of Ti, 0.20%-0.60% of Ni, 0.10%-0.30% of Cr, less than or equal to 0.0040% of N and the balance of Fe and inevitable impurity elements. The carbon equivalent CEV is less than or equal to 0.42%, and the cold crack sensitivity index Pcm is less than or equal to 0.20%. The manufacturing process of the steel plate comprises the steps of KR, electric furnace smelting, LF, VD, casting, slab slow cooling, heating, rolling, steel plate pile slow cooling, heat treatment and the like. The matrix structure of the obtained steel plate is a uniform and fine ferrite and tempered pearlite mixed structure, and the grain size ranges from 6 micrometers to 15 micrometers. The steel plate has excellent low-temperature impact toughness, lamellar tearing resistance, fracture resistance and low-temperature strain aging resistance, is easy to weld, and can meet the extremely cold service environment of the arctic circle.

The invention discloses a method for improving the welding performance of low-alloy high-strength wind power steel, which is characterized by comprising the steps of optimization of welding heat input, preheating before welding, welding process control and slow cooling after welding. By optimizing the welding heat input parameters, reasonably controlling the time (t8 / 5) for cooling to 500 DEG C from 800 DEG C, adjusting the structure transformation behavior of the welding heat affected zone and combining the process measures of preheating before welding, slow cooling after welding and the like, precise regulation and control of the microstructure of the welding heat affected zone are achieved, the hardening tendency and the embrittlement phenomenon of a coarse grain zone are effectively restrained, and the welding quality is improved. And therefore, the strength, toughness and crack resistance of a welding joint are remarkably improved, and the high requirements of offshore wind power structural parts for welding quality and service performance are met.

The invention discloses a solid sodium silicate preparation process based on segmented temperature control roasting, and relates to the technical field of inorganic chemical material preparation. The process comprises the steps of raw material proportioning, mixing homogenization, segmented temperature control roasting and post-treatment. By matching physicochemical reaction requirements in stages, the reaction is more stable and more thorough, the conversion rate is remarkably improved, and unreacted nuclei are basically eliminated. A quenching and slow cooling procedure is adopted, so that the product is ensured to have a high-whiteness and high-transparency glass body state, the internal stress is small, the mechanical strength is high, and the appearance quality and the physical property are remarkably improved; and by adjusting the temperature and time parameters of each stage, the requirements of different raw material specifications and production of products with different moduli can be flexibly met. By accurately controlling the temperature, time and atmosphere of each stage, the problems of non-uniform reaction and poor product quality in the traditional process are solved, and the preparation of solid sodium silicate with high conversion rate, high whiteness and low internal stress is realized.

The invention relates to a hot-rolled wire rod for a 2330MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after the wire rod is formed by rolling and spinning Cr-V high-carbon and high-silicon components, the wire rod is subjected to online molten salt isothermal toughening treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; the method comprises the following steps: carrying out hot rolling on austenite, carrying out post-stage molten salt treatment, increasing the temperature of molten salt, reducing the circulation volume of molten salt, promoting unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of part of sorbite lamellas, and finally carrying out roller way slow cooling to prepare a hot-rolled wire rod with a microstructure comprising a mixed structure consisting of tempered sorbite, ferrite and fused sorbite, the material cost can be controlled, the tensile strength is 1558-1608 MPa, the percentage reduction of area is 34%-39%, the production efficiency and the energy consumption are both considered, off-line heat treatment is not needed, and efficient and stable production of the ultra-high-strength stranded wire is met.

The invention discloses a preparation method of a high-strength glass insulator, and belongs to the technical field of electrical equipment materials, and the preparation method comprises the following steps: S1, preparing a glass matrix material: mixing 65-75% by weight of SiO2, 10-25% by weight of Al2O3, 5-8% by weight of B2O3, 3-5% by weight of CaO, 1-3% by weight of Na2O and 1-2% by weight of MgO, and melting to form molten glass; and S2, gradient heat treatment: injecting the molten glass into a mold for molding, and sequentially carrying out treatment in three stages of annealing at the high temperature of 650-700 DEG C, slow cooling at the medium temperature of 400-450 DEG C and stabilizing at the low temperature of 200-250 DEG C. The compressive strength is greater than or equal to 500 MPa, and the insulation resistance is greater than or equal to 1000 G omega.cm.

The invention relates to the technical field of spring steel preparation, in particular to a high-strength spring steel wire rod and a preparation method and application thereof. According to the steel wire rod, the content of C, Si, Mn, Cr, Mo, V, Nb and other elements is controlled, the strength and plasticity index SE is limited to be 1.25-1.75%, and meanwhile, the steel wire rod subjected to hot rolling of a continuous casting bloom is subjected to three-section controlled cooling through a Stelmor line, specifically, the steel wire rod is rapidly cooled to 670-710 DEG C at the speed of 4.2-5.5 DEG C / s, then slowly cooled to 620-630 DEG C at the speed of 0.3-0.5 DEG C / s, and finally air-cooled to 530-550 DEG C at the speed of 1.8-2.2 DEG C / s. According to the high-strength spring steel wire rod for the electric tailgate spring, through collaborative design of components and the process, the problem that when the ultrahigh strength of an existing high-strength spring steel wire rod for the electric tailgate spring is achieved, it is difficult to synchronously guarantee excellent structure uniformity, good plasticity and excellent fatigue performance is effectively solved.

According to the cooling device and the spinning system, a spinning cylinder for melt tows to penetrate through penetrates through a length-adjustable slow cooling channel of a slow cooling assembly, then penetrates through a through hole, communicating with one end of the slow cooling channel, in a supporting part of an air cooling assembly, and extends out of the outlet end of the through hole to be opposite to an air outlet part in the air cooling assembly; and overall cooling and curing of melt spinning are achieved. The length of the slow cooling channel is adjustable, the slow cooling distance corresponding to melt spinning is adjustable, the cooling device further comprises an air blocking structure which is arranged on the air outlet part and extends from one side of the air outlet part to the other side of the air outlet part in the radial direction of the through hole, and the air outlet area of the air outlet part can be changed so that the air cooling distance can be changed. The slow cooling distance and the air cooling distance corresponding to the melt tows can be changed, chemical fibers with different slow cooling and air cooling distances can be used for cooling, the universality of the cooling device can be greatly improved, and the technical problem that the universality of the cooling device in melt spinning is not ideal enough is solved to a certain extent.

This invention relates to the field of composite materials technology, and in particular to a high-energy-absorbing basalt fiber composite material, its preparation method, and its applications. The method includes the following steps: pretreating basalt fiber fabric; immersing the fabric in a composite treatment solution and drying it to obtain a microscale flexible interface layer; then coating the surface with a multiphase resin system, drying it after coating, and obtaining a toughened basalt fiber fabric; after stacking, inserting a nonwoven felt layer at several intermediate layers of the toughened basalt fiber fabric, evacuating the vacuum, then injecting a resin system, heating and maintaining the temperature for initial curing, tempering at a low temperature, and then slowly cooling; after demolding, processing to obtain the basalt fiber composite material. This invention employs the above steps, with a clear process path, strong repeatability, and easy engineering and large-scale production, providing a reliable technical solution for high-energy-absorbing basalt fiber composite materials in vehicle protective components, buffer energy-absorbing structures, and other high-impact load applications.

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

The application discloses a production method of a mining rare-earth wear-resistant GN-14A hot-rolled round steel, and a steelmaking process is as follows: a converter is operated with double-slag, and an end-point basicity is controlled at 2.5; the end-point control target of the converter is C >= 0.08%, and P <= 0.020%; a VD deep vacuum time is >= 15 min, and a soft blowing time is >= 20 min; a superheat degree is <= 25 DEG C, a caster pulling speed is 0.55 m / min <= 0.60 m / min; a casting blank slow cooling time is >= 24 hours; and a rolling process is as follows: 1020 DEG C <= open rolling temperature <= 1050 DEG C; 780 DEG C <= final rolling temperature <= 850 DEG C; 450 DEG C <= entering slow cooling pit temperature <= 550 DEG C; and 50 DEG C <= exiting slow cooling pit temperature <= 150 DEG C. The hot-rolled round steel prepared by the application has a structure of ferrite + pearlite structure, inclusion levels of A class <= 1.5 level, B class <= 1.5 level, C class <= 1.0 level, D class <= 1.5 level, and austenite grain size >= 5 level.

The invention discloses a melt separation titanium slag modification treatment method and system. The method comprises the steps that in the direct reduction-melt separation process, melt separation titanium slag components are regulated and controlled to enable the melt separation titanium slag to contain 40 wt%-60 wt% of TiO2 and 1.1 wt%-9 wt% of C, deslagging is conducted, after heat preservation melting is conducted on the melt separation titanium slag at the temperature of 1550-1600 DEG C for 30-60 minutes, slow cooling is conducted to 1200 DEG C at the cooling rate of 5-10 DEG C / min, then rapid cooling is conducted to 900 DEG C at the cooling rate of 20 DEG C / min or above, finally natural cooling is conducted to the room temperature, and modified slag is obtained. According to the method, regulation and control of components of the melt-separated titanium slag are combined with heat preservation, slow cooling, quenching and natural cooling, anosovite is directionally induced to serve as a main phase of the titanium slag, micronized spinel and an amorphous glass phase, titanium resources are enriched in the anosovite phase, and the modified titanium slag high in grade and good in activity is obtained; and the problems of low additional value, small utilization scale, poor economic benefit and the like of molten titanium slag products are solved.

This invention discloses a method for manufacturing 3D display glass and its curved display glass, relating to the field of glass manufacturing technology. A conveying preheating box is attached to one side of the top of a multi-stage temperature control frame. Several pressure-equalizing hydraulic cylinders are equidistantly installed on the top of the conveying preheating box. Pressure-limiting fixing frames are attached to the bottom of the pressure-limiting fixing frames. Inlet and outlet electric slide rails are symmetrically installed at the bottom of the pressure-limiting fixing frames. Inlet and outlet sliding frames are installed at the bottom of the inlet and outlet electric slide rails via slide rail seats. A positioning electric slide rail is embedded at one end of the inlet and outlet sliding frame. A shaping top mold is fitted between two clamping fixing frames. This invention utilizes a combination of pneumatic hot bending, gravity hot bending, shaping hot pressing, and edge correction hot pressing. Furthermore, by using slow heating and slow cooling, along with mold control, the shape of the curved glass can be effectively controlled. Simultaneous operation of pretreatment and forming processes reduces the waiting time required during production.

This invention relates to an 8.8 grade boron-containing cold heading steel wire rod and its production method. The process involves rolling, wire drawing, hot coiling, and slow cooling in a holding tunnel furnace. The wire drawing temperature is controlled at 900-950℃. After wire drawing, the wire rod is conveyed to the coiling process under holding conditions. The coiling temperature is 800-850℃. During slow cooling in the holding tunnel furnace, the furnace entry temperature is controlled at 720-770℃. The cooling rate of the coil in the 700-600℃ temperature range is ≤0.1℃ / s, and the exit temperature is ≤500℃. Utilizing the residual heat of the coil in the holding tunnel furnace for slow cooling results in a higher ferrite content and online softening of the microstructure. This effectively reduces the tensile strength and hardness of the boron-containing cold heading steel wire rod while improving its plasticity. The wire rod can achieve a tensile strength ≤450MPa, a reduction of area ≥58%, and a hardness ≤75HRB. It can be used for the non-annealing production of 8.8 grade nuts and other large deformation fasteners.

The invention discloses a welding process of a high-strength onboard load training device, which adopts a structural combination of a plurality of layers of steel plates and a high-ductility alloy connecting piece, and utilizes a composite welding device consisting of a welding head, a gas generating ring, a tempering heating ring and a slow cooling gas curtain ring which are coaxially arranged. The synergistic effect of an electric arc heat source and a laser heat source can be achieved in the welding process, a deep penetration weld joint is formed, and sufficient metallurgical bonding of the multi-layer steel plate and an alloy connecting piece is ensured. And in cooperation with annular protective gas, local tempering and slow cooling control, the welding seam structure can be effectively improved, the residual stress can be reduced, cold cracks and fatigue cracks are prevented, and therefore the strength and stability of a welding joint are remarkably improved.

The invention relates to the field of material surface treatment and machining, in particular to a method and device for directly preparing a copper alloy coating on the surface of a titanium alloy sealing rod. The process comprises the steps that firstly, cleaning and metal powder drying treatment are conducted on a sealing rod base material, and the base material is clamped on a rotary bearing mechanism in an adjusting box body; sealing the adjusting box body and filling inert gas to replace air until the oxygen content reaches the standard; the laser cladding mechanism is controlled to conduct scanning preheating on the surface of the base material in a non-powder-feeding state; then a powder feeding function is started, spiral high-speed laser cladding is carried out in cooperation with rotation of the base material and axial feeding of the cladding assembly, and closed-loop adjustment of the protective gas flow is carried out in the cladding process; and after cladding is completed, the base material is transferred into the heating furnace body in the box body to be subjected to post-treatment slow cooling, laser scanning preheating and in-furnace slow cooling are combined, atmosphere closed-loop control in a closed environment is matched, and the effect of restraining cracking and oxidation of a titanium alloy cladding layer is achieved.

The invention provides a production method of an alloy pipe blank 40Mn2, and belongs to the technical field of steel smelting. The method comprises the following steps: pretreating molten iron; the end point carbon content is larger than or equal to 0.10%, and the tapping temperature is smaller than or equal to 1650 DEG C; lF furnace refining is conducted, specifically, the total argon blowing time is larger than or equal to 40 min, the white slag holding time is larger than or equal to 15 min, and 300-600 m of a Ca line is fed; vD / RH vacuum treatment: soft argon blowing time is greater than or equal to 15 min; continuous casting; rolling: steel billet cold charging; and slow cooling: putting the rolled pipe blank into a slow cooling pit, wherein the slow cooling time is more than or equal to 24 hours. By means of the specific production steps, effective control over the quality of the alloy pipe blank 40Mn2 is achieved, and the percent of pass of products is greatly increased.