442 results about "Steel casting" patented technology

The invention relates to the technical field of manufacturing of engineering machinery parts, and discloses an engineering machinery driving wheel made of a medium carbon alloy cast steel material. The invention also discloses a preparation process of the engineering machinery driving wheel material, which comprises the following steps: S1, casting treatment: melting the medium carbon alloy steel material, and casting into a driving wheel blank; s2, normalizing heat treatment: carrying out normalizing heat treatment on the driving wheel blank; s3, rough machining treatment; s4, quenching treatment: carrying out induction quenching treatment; and S5, finish machining treatment. The synergistic effect of alloy elements in a medium carbon alloy cast steel material is combined with an optimized air cooling process, so that the cast steel is normalized to obtain a uniform structure which mainly contains superfine pearlite and contains extremely little ferrite, the matrix hardness is stable, and the requirement of a high-performance driving wheel is completely met; after the process route is improved, tempering and shot blasting and flaw detection procedures after tempering are canceled; the technological process is greatly shortened, material turnover is reduced, and the production efficiency is improved.

The invention relates to the technical field of large steel casting manufacturing, and discloses a crusher rack set for mining machinery and a casting method of the crusher rack set. The rack set comprises a cast steel body and a functional gradient reaction framework which is arranged in the cast steel body in advance and forms metallurgical bonding. The framework is made of refractory metal alloy, and an A area and a B area are divided on the framework. The area A is arranged at the heat accumulation core of the casting and is provided with a strong reaction coating on the surface; the area B extends outwards from the area A, and the surface of the area B is provided with a high-thermal-conductivity ceramic coating. The method comprises the steps of preparing the framework, installing the framework in a casting mold cavity, and then carrying out molten steel pouring and heat treatment. In-situ forced nucleation is initiated at the core of the casting through the strong reaction coating of the area A, a heat conduction path from inside to outside is established by means of the high heat conduction coating of the area B, and sequential solidification of the casting is achieved, so that defects such as shrinkage porosity and shrinkage cavities are effectively transferred, the density and uniformity of the internal structure of the casting are improved, and the casting quality is improved. And the overall mechanical property of the rack set is improved.

The application provides a structure Cu-containing Mo-V micro-alloy cast steel and a preparation method thereof. The cast steel material is composed of the following components in percentage of mass fraction: C: 0.06-0.13%, Mn: 1.3-1.9%, Si: 0.2-0.4%, Ni: 0.5-1%, Mo: 0.18-0.42%, V: 0.05-0.09%, and Cu: 0.25-0.65%. The method comprises the following steps: step one, adding a blank into an electric arc furnace or an induction furnace; step two, performing conventional smelting on the blank to obtain a molten steel with a required mass target component; step three, adjusting the temperature of a semi-finished cast steel and tapping the molten steel to obtain the cast steel; step four, performing heat treatment on the cast steel; and step five, judging the qualification of the cast steel to obtain a high-quality finished cast steel. Through the structure Cu-containing Mo-V micro-alloy cast steel and the preparation method thereof, the yield strength grade of the non-quenching + tempering type micro-alloyed precipitation strengthening type cast steel can be further improved, the low-temperature toughness of a large-size structure cast piece under a conventional process can be improved, and the cost consumption of the large-size structure cast piece under the conventional process can be reduced.

The invention discloses a steel casting heat treatment process which comprises the following steps: step 1, heating a steel casting to a complete austenitizing temperature (30-50 DEG C above Ac3), and preserving heat; secondly, the austenitized steel casting is discharged out of the furnace, an aqueous solution quenching mode is adopted, the steel casting is rapidly cooled, and the steel casting is rapidly cooled through an aqueous solution, taken out and left to stand till the steel casting is cooled to the room temperature; and thirdly, the cooled steel casting is subjected to high-temperature tempering at the temperature of 500-650 DEG C, and heat preservation is conducted. The steel casting is subjected to heat treatment by adopting annealing, quenching and tempering processes, and barium hydroxide is added in the aqueous solution in the quenching process step, so that the cooling capacity of the aqueous solution can be improved, and the problem of corrosion of the steel casting does not need to be worried about.

The invention discloses low-gas-evolution and high-heat-resistance precoated sand and a preparation method thereof, and relates to the technical field of casting materials.The preparation method comprises the following steps that cast steel reclaimed sand is dried, so that the water content of the cast steel reclaimed sand is reduced to 0.1% or below; taking 1000 parts by weight of treated cast steel reclaimed sand, adding 5-10 parts by weight of a silane coupling agent, and uniformly mixing; the mixed materials are heated to 75-80 DEG C and then transferred into a sand mixer, 30-40 parts by weight of organic polysilazane resin is added, and sand mixing is conducted; adding 6-8 parts by weight of carbon nanotube powder, and mixing for 30 seconds; sequentially adding 5-7 parts by weight of vinyl silicone oil and 1.8-2.4 parts by weight of calcium stearate, and uniformly mixing to obtain a precoated sand product. According to the present invention, the novel bonding system is adopted to prepare the sand mold through the low temperature film coating process, and the prepared sand mold can generate ceramic transformation during the casting stage so as to provide characteristics of extremely low gas forming amount, extremely high heat resistance, low thermal expansion rate and excellent casting quality, and the production process has characteristics of energy saving and consumption reducing.

The invention relates to the technical field of stainless steel casting preparation, in particular to an anti-aging stainless steel material and a casting process thereof. Wherein the chemical components comprise, by weight, 0.01%-0.03% of C, 18%-22% of Cr, 8%-11% of Ni, 0.1%-0.8% of Mo, 0.5%-1.5% of Mn, 0.2%-1.0% of Si, 1.0%-3.6% of Cu, 0.2%-0.5% of Nb, 0.15%-0.25% of N and the balance Fe. The lime, the fluorite, the aluminum powder and the sodium silicate solution are precisely proportioned, a series of synergistic effects are achieved through a rigorous technological process, the physical and chemical properties of the smelting slag are optimized, and the high-alkalinity and high-fluidity smelting slag generated through the synergistic effect of the lime and the fluorite has the advantages that the smelting efficiency is improved; ideal thermodynamic and dynamic conditions are provided for desulfurization and dephosphorization reactions, harmful elements such as sulfur and phosphorus can be rapidly combined with CaO, stable compounds are generated and enter a slag phase to be removed, and the toughness and corrosion resistance of stainless steel are improved.

The invention discloses a method for controlling longitudinal cracks of a bearing steel casting blank with a 150-square section, and belongs to the technical field of continuous casting of ferrous metallurgy. Five core processes are used for collaborative optimization: 1) the degree of superheat of molten steel is controlled to be 25-45 DEG C, and manual and continuous temperature measurement is adopted to ensure temperature accuracy; (2) full-process protective casting is carried out, the insertion depth of a submersed nozzle ranges from 110 mm to 125 mm, and the centering deviation is smaller than or equal to 1 mm; (3) crystallizer electromagnetic stirring (M-EMS) takes the magnetic induction intensity larger than or equal to 1000 Gs as the standard, the current is set to be 380-450 A, the frequency is set to be 5-7 Hz, and the forward and reverse rotation period is set; 4, vibration parameters are set according to the pulling speed, and the cooling water amount is synchronously controlled, 5, a composite flow field is formed through a water gap of four water outlet holes with the downward inclination angle of 45 degrees from the outer wall to the inner wall, and the longitudinal crack occurrence rate is reduced to 0.5%-1% from 8%-10%. The casting blank surface quality and component uniformity are both considered, and the method is suitable for large-scale industrial production of the high-carbon bearing steel.

The application relates to an auxiliary casting mold device for cast steel forming of a mine dump truck, which comprises a ventilation device composed of a ventilation pipe, a pressure regulating box and an air inlet box, and a fixed mold frame for cast steel forming; the upper port of the pressure regulating box is communicated with the lower port of the air inlet box; the ventilation pipe is provided with a ventilation triggering device at the end; an adjusting pipe is slidably connected in the air inlet box; the adjusting pipe is a pipe structure with a contraction in the middle and expansion at both ends; the application utilizes the pressure change caused by the contraction and expansion positions of the adjusting pipe by the cooling airflow to adjust the pressure in the pressure regulating cavity, and further adjusts the suction process of the ventilation pipe to the gas in the fixed mold frame; on one hand, the gas in the fixed mold frame is timely sucked into the pressure regulating cavity to avoid the residual gas in the fixed mold frame; on the other hand, after pouring is completed, the liquid cast steel material in the ventilation pipe is re-pressed into the fixed mold frame to reduce the loss of the cast steel material.

The present application relates to the technical field of stainless steel thin strip continuous casting, and provides a method for improving the solidification stability of thin strip continuous casting stainless steel, which comprises the following steps: obtaining an initial parameter set of the thin strip; obtaining an initial process parameter set; performing thin strip continuous casting in combination with the obtained process parameter set; measuring the molten pool liquid level, the casting and rolling force, the casting roll surface temperature and the casting strip surface temperature in real time during the thin strip continuous casting process; judging according to a judgment condition; if adjustment is needed, obtaining an adjusted process parameter set and returning; otherwise, proceeding to the next step; completing the thin strip continuous casting to obtain a thin strip product. In the present application, the molten pool liquid level, the casting and rolling force, the casting roll surface temperature and the casting strip surface temperature during the thin strip continuous casting process are measured in real time and judged according to corresponding judgment conditions, and through the establishment of real-time collaborative control of "liquid level-heat transfer-casting and rolling force-roll gap", the surface quality and the microstructure uniformity are improved while ensuring the continuous and stable production of stainless steel casting strip with a thickness of ≤2 mm.

The invention discloses a novel nano-coating cast steel brick and a preparation method thereof. The cast steel brick comprises a cylindrical refractory matrix, a double-layer nano coating and a modified metal reinforcing belt, wherein the double-layer nano coating comprises a nano aluminum oxide bottom layer and a functional layer containing a sol-gel pre-coated graphene-ceramic composite material. According to the preparation method, pulse vibration forming, a sol-gel pre-coating technology and a carbon thermal reduction protective atmosphere sintering technology are adopted, the graphene-ceramic composite material has an Al2O3-BN double-layer ceramic coating layer protection structure, and the structural stability of graphene at the high temperature is ensured. The technical problems of low refractoriness, poor corrosion resistance and short service life of a traditional cast steel brick are solved, the refractoriness is improved by about 6%, the corrosion resistance is improved by 78%, the thermal shock stability is improved by about 79%, the single use performance is improved by 250%, and the cast steel brick is suitable for molten steel flow control in a continuous steel casting process.

This invention discloses a high thermal conductivity duplex cast steel housing for a high-speed permanent magnet motor and its preparation method. The high thermal conductivity duplex cast steel housing for a high-speed permanent magnet motor comprises the following components by weight percentage: C 0.3-0.45%, Cr 5-10%, Si 0.4-0.7%, Mn 0.5-1.5%, Mo 1-2%, Ni 2-3%, W 0.8-1.8%, Ti 0.05-0.1%, with the balance being iron and unavoidable impurities. This invention optimizes the alloy composition and controls the content of each element, while simultaneously applying a thermally conductive coating to the surface of the housing. This results in a housing with both excellent heat dissipation capacity and high-temperature strength, solving the problems of excessive temperature rise and thermal deformation of the housing under high-speed motor operation.

The ladle baking device comprises a base, a steel ladle placed on the base and a ladle baking device which is arranged on the base and can ascend and descend, and is characterized in that a placing groove is formed in the base, and the rear side of the placing groove is of a square structure; an opening is formed in the outer side of the containing groove, the width of the opening is gradually reduced from outside to inside till the width of the opening is consistent with the width of the square structure, two square blocks extending in the front-back direction are arranged on the left side and the right side of the bottom of the steel ladle, and inserting holes allowing forks of a forklift to be inserted are formed in the middles of the square blocks. And when the steel ladle is placed in the placing groove and the left side wall, the rear side wall and the right side wall of the steel ladle abut against the left side wall, the rear side wall and the right side wall of the placing groove correspondingly, the ladle baking device is located over the steel ladle. According to the ladle baking device, before baking, a steel ladle containing aluminum ingots is transported and placed in the containing groove through a forklift, when the steel ladle is placed in the containing groove, the steel ladle is guided and positioned through the containing groove, the position of the steel ladle is determined after the steel ladle is stably placed, and baking can be conducted only by descending the ladle baking device.

The utility model belongs to the technical field of cooling, and discloses a cooling and blow-drying device for wear-resistant steel castings, which comprises a box body and a pair of guide rails, guide wheels are mounted at four corners of the box body, the guide wheels walk on the guide rails, through grooves are formed in two sides of the box body, a support box is fixedly mounted on the upper side of the box body, and an electric lifting platform is fixedly mounted on the upper side of the support box. A pair of baffles is fixedly mounted on the upper side of the electric lifting platform through supporting rods, and the baffles and the through grooves are assembled in a blocking mode; a bent pipe is rotationally installed in the middle of the interior of the box body, nozzles are evenly installed on the side, away from the box body, of the bent pipe in a communicating mode, and a driving assembly used for rotating the bent pipe and an air supply assembly used for inputting high-pressure air into the bent pipe are arranged on the upper side of the box body. According to the utility model, the box body can form a relatively sealed space, the bent pipe can be rotated by matching with the driving assembly and the air supply assembly, and air output by the nozzle can rotate circumferentially, so that the labor intensity is reduced, and meanwhile, comprehensive and thorough cooling and blow-drying treatment can be carried out on the wear-resistant steel casting.

The application discloses a preparation method of a 1.5mm hot-rolled 800MPa-grade weather-resistant photovoltaic support steel in the field of hot-rolling steel production, and the method comprises the following steps: adopting a steel grade component with 800MPa-grade weather resistance, controlling the thickness and length of the steel casting blank; adopting a hot feeding and hot charging mode for heating; rough rolling and finish rolling are carried out; laminar cooling is carried out on the steel strip after finish rolling; and finally, coiling is carried out. The application adopts a plate blank with a proper length, which is beneficial to reducing the temperature difference of the intermediate blank and the head and tail of the steel coil, the hot feeding and hot charging mode is adopted for heating, the core temperature of the plate blank can be improved, the rolling is stable, the rough rolling is carried out for four passes, the temperature drop at the entrance of the finish rolling is further reduced, and through reasonable control of the rolling speed, the plate crown, the loop amount, the bending force and the roll shifting amount and other processes in the finish rolling process, the 1.5mm thick hot-rolled steel plate has the advantages of good rolling stability, good weather resistance and excellent comprehensive performance, and the production efficiency and the yield of the extremely thin gauge hot-rolled high-strength weather-resistant steel plate can be improved.

The application discloses a fixing block for a magnetic steel casting and a mold of the fixing block and belongs to the technical field of magnetic steel casting drilling parts. The fixing block comprises a cuboid fixing block body, the material of the fixing block body is coated sand material, and one end of the fixing block body is provided with a notch. The notch can clamp the end of a core column, and the fixing block body can be fixed on the side wall of a mold cavity. The cuboid fixing block body is arranged, so that the fixing block body can be firmly clamped into a strip-shaped groove and pave the way for fixing the core column. The notch is arranged, the notch can clamp the end of the core column, the core column is prevented from moving, and the fixing effect is affected.

The utility model relates to the technical field of temperature control heat treatment equipment, and discloses cast steel steering gear support casting temperature control heat treatment equipment which comprises a temperature control box body and temperature control heat treatment modules, the temperature control heat treatment modules are assembled on the two sides of the top of the temperature control box body, a motor is assembled on the top of the temperature control box body, a rotating shaft is assembled at the position of an output shaft of the motor, and the rotating shaft is connected with the temperature control box body. Rotating discs are evenly distributed outside the rotating shaft, gear rings are evenly distributed on the back face of the inner side of the temperature control box body, supporting mechanisms are evenly distributed on the tops of the rotating discs, the hasp module comprises a retaining ring and clamping teeth, and the retaining ring and the clamping teeth are assembled on the tops of the two rotating arms respectively. According to the temperature-control heat treatment equipment for the cast steel steering gear support casting, the steering gear support is self-locked by utilizing the characteristic that the number of holes and grooves in the outer portion of the steering gear support is large, multiple fixing of the steering gear support is achieved, and the problem that the steering gear support is damaged due to the fact that the center of gravity of the steering gear support is not evenly distributed and the steering gear support falls off outside a rotary disc easily is solved.

The invention discloses a steel pipe tower body cast steel connecting assembly, and belongs to the technical field of steel pipe towers, the steel pipe tower body cast steel connecting assembly comprises a connecting main pipe sleeve, the outer wall of the connecting main pipe sleeve is fixedly connected with a first multi-pipe-sleeve assembly and a second multi-pipe-sleeve assembly, the connecting main pipe sleeve is provided with a plurality of side pipe openings, and the side pipe openings are communicated with the first multi-pipe-sleeve assembly and the second multi-pipe-sleeve assembly. By designing the threaded locking assembly and the corresponding steel pipe assembly, the steel pipe assembly can be clamped, extruded and fixed through the clamping locking sleeve and the extruding locking sleeve, additional force can be provided to achieve connection between the connecting main pipe sleeve and the steel pipe assembly, and after follow-up welding and fixing, when a vibration load is borne, the steel pipe assembly can be clamped, extruded and fixed through the clamping locking sleeve and the extruding locking sleeve. The stress of a welding seam can be effectively reduced through connection provided by the threads, and then the service life between the whole connecting assembly and the steel pipe is prolonged.

The application relates to the technical field of hot rolling wide and thick plate different-steel casting, in particular to a cutting method of different-steel mixed casting blanks. The method comprises the following steps: adopting a constant speed mode to continuously cast different steels, and determining the starting position of the mixed casting blank and the ending position of the mixed casting blank by calculating time; wherein the different steels comprise a first steel and a second steel; according to the planned cutting length of the first steel and the second steel, the casting sequence of the first steel and the second steel is adjusted; and according to the planned cutting length of the first steel and the second steel, the cutting mode of the mixed casting blank is adjusted. The application solves the technical problem that the cutting effect of the existing different-steel mixed casting blank is poor.

The utility model relates to the technical field of large-span steel beam connection, in particular to a cast steel joint with a positioning structure, which comprises a connecting component and two square tubes, and four support components are fixedly connected to the lower end of the connecting component in an annular array; the connecting assembly comprises a fixing pipe, two positioning pipes are fixedly connected to the rear portion of the outer surface of the fixing pipe, two connecting frames are fixedly connected to the left portion and the right portion of the outer surface of the fixing pipe, and three connecting frames are fixedly connected to the lower side of the front face of the outer surface of the fixing pipe. The lower ends of the two square pipes, the lower portion of the outer surface of the lower positioning pipe and the lower portion of the outer surface of the middle connecting frame are fixedly connected with the upper ends of the four supporting assemblies correspondingly. According to the cast steel joint with the positioning structure, the connecting assembly and the four supporting assemblies are arranged on the whole cast steel joint with the positioning structure, and the connecting and fixing process of a large-span steel beam can be facilitated through the four supporting assemblies.

The invention belongs to the technical field of metallurgy, and particularly relates to low-crack-expansibility high-speed steel casting powder and a preparation method thereof.The casting powder is composed of, by weight, 35%-40% of silicon dioxide, 26%-29% of graphite, 12%-15% of aluminum oxide, 11%-15% of calcium oxide, 2%-4% of calcium fluoride, 3%-5% of magnesium oxide and 2%-5% of sodium oxide. According to the casting powder, by precisely adjusting the proportion of the fluxing agents such as SiO, CaO, CaF and NaO to the key components, the optimized CaO / SiO ratio and a proper amount of AlO, the technical problem that in the casting process of a high-speed steel square billet, surface defects are likely to be formed and expand into macroscopic cracks in the follow-up forging link, and then the product yield and economic benefits are seriously affected is solved.

This invention provides a sand molding device for stainless steel casting production, relating to the field of sand molding technology. It includes a device base, a lower molding box above the base, an ejector mechanism (a retractable sleeve structure) above the base, a vibration generator above the base, a sand mold above the base, and two release agent spraying devices above the base, located on the upper and lower sides of the sand mold respectively. In this invention, the lower molding box, ejector mechanism (a retractable sleeve structure with internal springs), vibration generator (capable of generating vibrations via ultrasound), sand mold, and two release agent spraying devices located on the upper and lower sides of the sand mold, each with a set of spray nozzles arranged in a straight line, allow for efficient operation during the sand molding process.

The utility model discloses casting strength detection equipment based on food processing, which comprises a detection device, the inner wall of the detection device is connected with a lifting frame in a sliding manner, the lifting frame is internally provided with a medicine dripping device and a clamping mechanism, and the clamping mechanism comprises a fixed plate fixedly connected to the left side of the top of the detection device. The surface of the inner wall of the fixing plate is movably connected with a lead screw through a bearing, the surface of the lead screw is in threaded connection with a clamping plate, the inner wall of the clamping plate is slidably connected with a limiting rod, and the left side and the right side of the limiting rod are fixedly connected to the right side of the fixing plate and the left side of the detection device respectively. When the device is used, under the action of the clamping mechanism, the driving mechanism, the transmission mechanism and the linkage mechanism, the strength of the stainless steel casting for food can be detected more quickly and conveniently, the inconvenience that the casting is clamped manually and the dropping height cannot be adjusted is avoided, and the device has the advantage of being convenient to use.

The utility model discloses a grid beam node structure in a space structure, which is characterized in that a grid beam is formed by splicing a top plate, a bottom plate and a side plate, the whole grid beam is of a square box beam structure which is arranged in an X shape, and an inserting plate is arranged in the intersection center of the grid beam; the insertion plate vertically penetrates through the top plate and the bottom plate, a first insertion hole matched with the insertion plate is formed in the top plate, a second insertion hole matched with the insertion plate is formed in the bottom plate, the upper end of the insertion plate is arranged in the first insertion hole and welded to the top plate, and the lower end of the insertion plate extends out of the second insertion hole and forms a drop-shaped first lug plate on the outer side of the bottom plate; the portion, matched with the second inserting hole, of the inserting plate is welded to the bottom plate. The two side edges of the inserting plate are welded to the corners of the side plates located on the two longitudinal sides respectively. The steel casting node structure has the advantages of being high in strength and rigidity, good in stability, convenient to manufacture, easy in quality control and the like, and can effectively solve the problems existing in a traditional steel casting node structure.

This utility model discloses a surface spraying device for stainless steel castings, relating to the field of stainless steel casting processing technology. It includes a spraying box, and further comprises: a moving mechanism mounted on the spraying box, a spraying mechanism mounted on the spraying box, a filter collection mechanism mounted on the spraying box, a vacuum pump, a gas purification box, a blower housing, a first connecting pipe, and a second connecting pipe. Through the cooperation of the filter collection mechanism, vacuum pump, gas purification box, blower housing, first connecting pipe, and second connecting pipe, air circulation within the spraying box is achieved. This allows the gas purification box to purify the exhaust gas generated during the spraying process, and allows dust on the surface of the stainless steel castings to be collected in the filter collection mechanism, improving the coating adhesion effect. Furthermore, the air within the spraying box is discharged after purification, preventing pollution of the workshop environment and reducing harm to the health of operators.

The utility model relates to the technical field of cast steel sluice valves, and discloses a cast steel sluice valve which comprises a cut-off mechanism, a connecting mechanism and a main body mechanism, the cut-off mechanism is located on the side wall of the main body mechanism, the connecting mechanism is located at the top end of the cut-off mechanism, the cut-off mechanism comprises a runner pipe, and the inner wall of the runner pipe is in sliding connection with a movable plate. The back of the movable plate is fixedly connected with a connecting rod, and the tail end of the connecting rod is fixedly connected with a sealing gasket. The circulating pipe is slidably connected with the movable plate, the movable plate is fixedly connected with the connecting rod, the connecting rod is fixedly connected with the sealing gaskets, and the sealing gaskets are arranged at the two ends of the circulating pipe, so that the circulating pipe can be sealed through the sealing gaskets, and the situation that foreign matter enters the device to cause blockage before communication can be effectively avoided; and therefore, the smoothness of the device after communication can be improved.

The utility model relates to the technical field of pipeline engineering, and discloses a water-swelling sealing cast steel alloy micro-top pipe joint, which comprises a pipe and a pipe joint sleeved at the end part of the pipe, the pipe joint comprises a pipe joint body and a check ring, the check ring is fixed in the middle of the inner wall of the pipe joint body, and a plurality of through holes are formed in the check ring along the circumferential direction. And a fixing structure for fixedly connecting the pipe with the pipe joint is arranged in the through hole. The through hole is formed in the check ring, the fixing structure is arranged in the through hole, the pipe and the pipe joint are fixedly connected, deviation or idling of the pipe and the pipe joint in the construction process is prevented, and the connection precision and the construction efficiency are improved. In addition, the groove is formed in the pipe joint body, the water swelling rubber ring is arranged in the groove, the water swelling characteristic of the rubber ring is utilized, multiple sealing is formed, the waterproof performance of the joint is remarkably improved, and the pipe joint is suitable for pipeline construction in the high-humidity or water environment.

The invention discloses a deburring and grinding device based on stainless steel casting machining, and relates to the field of grinding devices.The inner side of a reserved base is provided with a driving motor shaft, the lower end of the driving motor shaft is in butt joint with a preset motor, and the outer side of the upper end of the driving motor shaft is fixedly connected with a first abutting butt joint piece; a nesting butt joint piece is nested in the upper end of the reserved base, the first abutting butt joint piece is arranged on the inner side of the nesting butt joint piece, and a transverse butt joint piece is nested in the surface of the reserved base. According to the deburring and grinding device based on stainless steel casting machining, a nested butt joint piece rotating circumferentially is matched to effectively drive a self-locking workpiece and a driving grinding roller making contact with the self-locking workpiece to conduct multi-direction surface treatment work, and inner diameter locking and positioning treatment can be effectively conducted even when tubular stainless steel castings with different inner diameters are machined; while the contact face of a machined workpiece and the burr grinding structure is guaranteed, all-directional grinding operation is conducted on the machined workpiece.

The invention relates to the technical field of heat supply engineering, and discloses a variable type super-efficient heat supply transmission and distribution machine room which comprises a softened water system assembly, a water tank, a water supplementing assembly, a transmission and distribution assembly, a heat exchange assembly, a secondary transmission and distribution assembly and a control system assembly, and the transmission and distribution assembly comprises a volumetric multifunctional filter. According to the variable type super-efficient heat supply transmission and distribution machine room, in order to enable the machine room to adapt to dynamic requirements of heat supply of various buildings, the transmission and distribution assembly is arranged, the effective filtering area of the assembly matched with a volumetric multifunctional filter is larger than that of a traditional Y-shaped filter, water inlet resistance is greatly reduced, and the assembly is matched with an inlet and outlet pressure transmitter and an electric blow-down valve; automatic pressure difference detection and dirt discharge are achieved, cavitation of the water pump is avoided, the large, middle and small ultra-efficient energy-saving end suction pumps are combined to form seven flow gears, stepless adjustment is achieved through fine adjustment of the frequency converter, and the sealing performance is excellent in cooperation with cast steel materials and high-temperature-resistant iron core rubber balls.

The application relates to a high-strength and high-toughness pressure-bearing cast steel and a preparation method and application thereof. The high-strength and high-toughness pressure-bearing cast steel is composed of C: 0.10-0.15%, Si: <=0.40%, Mn: 0.40-0.70%, P: <=0.020%, S: <=0.010%, Cr: 0.20-0.50%, Mo: 0.40-0.60%, V: 0.15-0.30%, Ti: 0.04-0.08%, N: 0.012-0.023%, Ca: 0.02-0.04%, Sr: 0.005-0.015%, and the rest is Fe and inevitable impurities, and the composition of the high-strength and high-toughness pressure-bearing cast steel satisfies the following relations: F1=([Ca]-1.25[S]) / 40, F2=[Sr] / 88, F3=[Ti] / 48, F1 / F2=4.0-6.5, and F3 / (F1+F2)=1.5-4.5; wherein, [Ca], [S], [Sr] and [Ti] respectively represent the weight percentage of Ca, S, Sr and Ti. The cast steel is prepared through the processes of smelting, casting, quenching and tempering. The cast steel is suitable for normal-temperature pressure containers (such as water storage tanks and gas storage tanks).

Disclosed herein are duplex stainless steel alloys comprising 40 wt %-60 wt % ferrite and 60 wt %-40 wt % austenite and methods of formation thereof, the alloys including or consisting essentially offrom 10 wt % to 20 wt % chromium (Cr);from 7 wt % to 13 wt % molybdenum (Mo);from 0.5 wt % to 6.5 wt % nickel (Ni);from 2.25 wt % to 12 wt % manganese (Mn);from 0.05 wt % to 5 wt % copper (Cu);from 0.05 wt % to 0.4 wt % nitrogen (N);less than 0.05 wt % carbon (C);from 0.01 wt % to 3.5 wt % cobalt (Co);less than 2 wt % silicon (Si);less than 2 wt % tungsten (W); andiron (Fe) balance.The duplex stainless steel alloy may include cast or wrought steel, or it may be in powder form.