19 results about "Cementation process" patented technology

The present application belongs to the field of metal materials, and particularly relates to a high-temperature carburizing process method of gear steel quenched by different media. The present application develops the carburizing process of gear alloy carburizing steel by finite element simulation mode, and proposes a double-medium quenching process to improve the phase organization of the core of the sample, reduce the martensite content of the core, increase the bainite content, thereby reduce the hardness of the core, and further improve the toughness of the core of the sample, on the basis of ensuring the control of production cost, without increasing the process flow and improving the use performance. The carburized surface is still martensite organization, and the high hardness of the surface layer is maintained.

The application provides a high-efficiency carburizing method for carburized medium manganese steel and belongs to the technical field of metal materials. The present research takes solid carburizing technology as the core and aims to explore the influence of different carburizing processes on the thickness and quality of the carburized layer. From the perspective of process design, by analyzing the medium manganese steel samples under different carburizing time and temperature conditions, it is found that under certain carburizing time and temperature conditions, ideal carburized layer thickness and carbon content can be obtained. The carburized layer thickness obtained by double-temperature carburizing is 615-952 mu m, and the hardness is as high as 276.7 HV. By controlling the final carburizing temperature and holding time, the control of different carburized layer thickness is realized. Through the present research, important clues for optimizing process parameters and controlling the thickness of the carburized layer are provided, and beneficial references for further optimization of medium manganese steel materials in terms of high strength, wear resistance and the like are provided.

The invention relates to the technical field of oil field oil production engineering, in particular to a half-way sealing tool and a half-way well cementation process for an ultra-short radius horizontal well. The problem that an existing oil displacement efficiency evaluation method cannot evaluate the oil displacement efficiency in different pore intervals of a rock core is mainly solved. The lower end of the body (3) is connected with the blind plate pup joint main body (1), and the blind plate pup joint partition plate (2) is arranged in the blind plate pup joint main body (1); a rubber sleeve (5) is arranged outside the body (3), and the upper end and the lower end of the rubber sleeve (5) are fixed through an upper protective sleeve (6) and a lower protective sleeve (4) respectively. The interior of the body (3) is connected with a sliding sleeve (7) through a shear pin (8). According to the half-path sealing tool for the ultra-short-radius horizontal well, the length of an original well cementation tool is shortened, the centering degree can be better guaranteed in a large-curvature-radius borehole, the length of a residual cement plug in a pipe is reduced, and plug drilling operation is better facilitated; the well cementation technology can improve the well cementation displacement efficiency and improve the well cementation quality.

The application discloses a surface carburizing process for 18NiCrMo7-6 gear steel, which comprises the following steps: S1, placing the gear steel workpiece in a vacuum carbonization furnace, increasing the furnace temperature to 840-880 DEG C, and introducing 6-10 m 3 / h of acetylene and 1-3 m 3 / h of nitrogen to perform carburizing treatment; S2, maintaining the temperature unchanged, and introducing 1-3 m 3 / h of nitrogen; S3, introducing 6-10 m 3 / h of acetylene and 1-3 m 3 / h of nitrogen to perform carburizing treatment; S4, introducing 1-3 m 3 / h of nitrogen; repeating steps S3-S4, wherein steps S3-S4 are taken as a basic pulse unit, the time of each basic pulse unit is 5-7 min, the total treatment time is 6-10 h, and then the gear steel workpiece is subjected to segmented cooling, uniform temperature maintaining, high-temperature tempering, quenching and low-temperature tempering. The carburizing efficiency is improved without increasing the carburizing temperature, and a relatively thin carbide layer and a relatively thick diffusion layer can be obtained.

The invention relates to the technical field of metal surface nitriding machining, and discloses heat treatment equipment and method for metal surface nitriding machining.The heat treatment equipment comprises a machining containing base, a machining inner layer is fixedly installed in the machining containing base, and a pit type vacuum carburizing furnace is fixedly installed in the machining inner layer; a grinding box base is fixedly mounted on one side of the machining containing base, and a grinding notch is formed in the grinding box base in a penetrating mode. The pit type vacuum carburizing furnace is stably installed through the machining placement base and the machining inner layer, then metal surface hardening is achieved through periodic heating, atmosphere control and carbon element diffusion by means of the pit type vacuum carburizing furnace based on the gas carburizing technology, and the nitriding function of the pit type vacuum carburizing furnace is used for achieving the purpose of surface hardening. The quenching deformation is reduced, the energy consumption is reduced, nitriding processing can be carried out on the metal surface, quenching deformation is not prone to occurring when nitriding processing is carried out on the metal surface, and therefore the nitriding effect on the metal surface is improved.

The invention discloses ultra-pure gear steel for high-temperature vacuum carburization and a manufacturing method of the ultra-pure gear steel, and belongs to the technical field of special steel smelting. The gear steel has ultrahigh purity and high grain coarsening resistance temperature, and comprises the following chemical components in percentage by weight: 0.17 to 0.22 percent of C, 0.15 to 0.40 percent of Si, 1.10 to 1.40 percent of Mn, 1.00 to 1.30 percent of Cr, 0.10 to 0.20 percent of Ni, less than or equal to 0.003 percent of S, less than or equal to 0.015 percent of P, 0.05 to 0.10 percent of Al, less than or equal to 0.0008 percent of Ca, less than or equal to 0.0010 percent of O and the balance of Fe and inevitable impurities. The manufacturing process comprises the steps of KR pretreatment, BOF converter, LF refining, RH vacuum degassing, CCM continuous casting, flame cleaning, continuous rolling, finishing, flaw detection and the like. The inclusion of the steel bar produced by the invention meets the condition that K1 is less than or equal to 3, the internal ultrasonic flaw detection reaches AAA level, the grain coarsening resistance temperature is high, the steel bar is suitable for a high-temperature vacuum carburizing process at 980 DEG C or above, the fatigue strength and the service life of a gear can be remarkably improved, and the heat treatment energy consumption is reduced.

The invention discloses a hot working method for improving the surface hardness of a G13Cr4Mo4Ni4V steel bearing. The hot working method comprises the following steps that firstly, a G13Cr4Mo4Ni4V steel bearing ring is subjected to structure improvement diffusion annealing; 2, vacuum carburizing is carried out, and primary quenching cooling is carried out to reach the room temperature; thirdly, high-temperature tempering is conducted three times; 4, finish turning is conducted, and high-temperature carburizing and secondary quenching are conducted to reach the room temperature; 5, primary deep cooling and primary tempering are carried out; and sixthly, secondary deep cooling, secondary tempering and third tempering are carried out. According to the method, high-temperature short-time pulse carburization is carried out before secondary quenching, additional machining procedures are not added, meanwhile, the surface hardness of the bearing is improved, retained austenite is reduced, the uniformity of a carburized layer is optimized, and the structure defect risk and time cost caused by a primary long-time carburization or secondary multiple carburization process are avoided; resource waste caused by using high-power heat treatment equipment is reduced, production efficiency is improved, and great economic value is generated.

The invention discloses a positive and negative circulation combined well cementation tool and a well cementation method, belongs to the technical field of oil exploitation, and aims to solve the problem of poor adaptability of well cementation by purely using positive circulation or reverse circulation. The positive and negative circulation combined well cementation tool comprises a cross circulation short section (2) and a reverse circulation well cementation intercepting float shoe (3) which are arranged up and down; the reverse circulation well cementation intercepting float shoe (3) comprises an intercepting assembly (33) and a one-way valve (32), and the intercepting assembly (33) comprises a control module (332) and an intercepting module (333). According to the positive and negative circulation combined well cementation tool and the well cementation method, the advantages of positive circulation and negative circulation well cementation processes are fully utilized, pressure balance and cement paste conveying are achieved, the well cementation problem of an ultra-long sealing section and a complex stratum is solved, the well cementation quality and the construction efficiency are greatly improved, and the well cementation cost is reduced. The method is suitable for oil and gas well cementing operation under complex geological conditions.

The invention discloses leaking stoppage cement paste for a weak cementation layer as well as a preparation method and application of the leaking stoppage cement paste. The cement paste is prepared from the following components in parts by mass: 100 parts of cement, 0.2-1.2 parts of a leaking stoppage material, 2-6 parts of a fluid loss agent, 0.2-1.5 parts of a dispersing agent, 0.1-0.6 part of a defoaming agent and 40-50 parts of water. The preparation method of the cement paste comprises the following steps: 1) mixing the cement, the leaking stoppage material, the fluid loss agent and the dispersing agent in parts by mass to obtain a solid mixture; 2) mixing water and a defoaming agent according to a mass ratio to prepare slurry preparation water; and (3) adding the solid mixture into slurry preparation water which is stirred at a low speed, and stirring at a high speed after the solid mixture is added, thereby obtaining the cement slurry for leaking stoppage. The leaking stoppage cement paste for the weak cementation layer is applied to preparation of weak cementation layer materials for well cementation of oil and gas wells. The system improves the plugging performance of the cement paste, reduces the leakage risk in the well cementation process, improves the cementing strength of the first interface and the second interface of well cementation, and ensures the well cementation quality.

The cement injection valve easy to drill and grind comprises an outer sleeve, an inner sliding sleeve vulcanization assembly, a screen pipe and a non-return vulcanization assembly, the outer sleeve is provided with a first through hole, the inner sliding sleeve vulcanization assembly is arranged in the outer sleeve in a sliding and sleeved mode and provided with a second through hole, the screen pipe is fixedly arranged in the inner sliding sleeve vulcanization assembly in a sleeved mode and provided with a third through hole, and the non-return vulcanization assembly is provided with a second through hole. A piston cavity is formed between the second through hole and the third through hole, a piston is arranged in the piston cavity in a sliding and sleeved mode, the non-return vulcanization assembly is located in the piston cavity and adsorbed to the third through hole, a cement injection valve structure is formed through the arrangement of the first through hole, the second through hole, the third through hole and the piston, and through the arrangement of the non-return vulcanization assembly, cement injection is achieved. By means of the non-return vulcanization assembly, cement paste on the inner side of the screen pipe can easily enter the piston cavity, however, external chippings and cement paste cannot enter the screen pipe through the non-return vulcanization assembly in the well cementation process, the protection effect is achieved, a plurality of outer sleeves and cement injection valve bodies are not needed in the whole cement well cementation process, and the manufacturing cost and the maintenance cost are effectively reduced.

The invention relates to the technical field of steel heat treatment, and discloses a carburizing process of 20CrMnTiSH1-H5 steel, which comprises the following steps: S1, pretreatment before carburizing, S2, carburizing preparation stage, S3, graded carburizing implementation stage, S4, quenching treatment after carburizing, S5, tempering treatment, S6, post-treatment stage and S7, quality inspection stage. Through precise surface pretreatment (the scratch depth after polishing is smaller than or equal to 0.15 mm, and Ra is smaller than or equal to 1.2 microns) and preheating to eliminate residual stress, and by combining a strong carburizing-diffusion grading process (the carbon potential is 0.65-1.15% C, and the temperature is 890-940 DEG C), the depth of the carburized layer is controlled to be 0.8-1.6 mm, the surface carbon concentration is 0.75-1.05% C, the carburized layer is smooth in transition and free of sudden change, and the carburized layer is not prone to deformation. The problems of uneven carburized layer and carbide aggregation in the traditional process are effectively solved, and the performance consistency of the whole tooth surface of the gear is ensured.

The invention relates to a laboratory simulation test method for the reconstruction effect of a caving zone grouting filling roof, and belongs to the technical field of coal mining and rock stratum control. The method solves the problem that in the prior art, the mechanical property of the grouting reconstructed roof is difficult to scientifically and quantitatively predict and evaluate before construction. According to the technical scheme, on-site caving rock mass lumpiness characteristic parameters are obtained through numerical simulation, the experiment reduced scale proportion is determined based on the similarity theory, the grouting cementation process under overlying strata stress is simulated in a special device, and finally a core sample is drilled to test the physical and mechanical parameters of the core sample. According to the method, controllable and measurable laboratory evaluation of the reconstruction effect is achieved, a direct basis can be provided for optimizing process parameters and reducing engineering cost and risks, and resource utilization of the coal-based solid waste is promoted.

A facile method is based on a pack-cementation process using large-area copper foil instead of copper powder. By controlling a pack-cementation time and an amount of alloying element (e.g., aluminum), a hierarchical microporous or nanoporous copper can be created. When coated with tin active material, the hierarchical microporous or nanoporous copper can be used as an advanced lithium-ion battery anode. A coin-cell test exhibited a four-fold higher areal capacity (e.g., 7.4 milliamp-hours per square centimeter without any performance degradation up to 20 cycles) as compared to a traditional graphite anode.

The present application relates to a kind of laboratory simulation test methods of collapse zone grouting filling roof reconstruction effect, belong to coal mining and strata control technical field.The method solves the problem that it is difficult to scientifically, quantitatively predict and evaluate the mechanical properties of grouting roof reconstruction in prior art.The technical scheme is as follows: obtain the block size characteristic parameters of field collapse rock mass by numerical simulation, determine the experimental scale ratio based on similarity theory, simulate the grouting cementation process under overburden stress in special device, and finally drill core sample to test its physical and mechanical parameters.The method realizes controllable, measurable laboratory evaluation of reconstruction effect, can provide direct basis for optimizing process parameters, reducing engineering cost and risk, and promote the resource utilization of coal-based solid waste.

The invention discloses a method for improving the performance of carburized bearing steel, and belongs to the technical field of special steel machining processes. The method comprises the steps that microalloying design is conducted, specifically, an Nb element is added into 20Cr steel, the mass fraction of the Nb element is controlled to be 0.022%-0.028%, and 0.001%-0.002% of Ti and 0.02%-0.04% of Al are reserved; the temperature is increased to 930 DEG C at the speed of 5-10 DEG C / min, and heat preservation is conducted for 1-3 h; after carburizing, water cooling to 200 DEG C at the speed of more than or equal to 50 DEG C / s to inhibit secondary precipitation of NbC; and normalizing treatment: heating to 860-880 DEG C, preserving heat for 40-60 minutes, and then air-cooling or air-cooling to obtain a fine ferrite and pearlite structure. Through the synergistic effect of Nb microalloying, carburizing process optimization and subsequent normalizing treatment, austenite grain size control, ferritic structure refinement and microhardness improvement of the carburized bearing steel are achieved.

The present application belongs to the field of metal materials, and particularly relates to a high-temperature carburizing double quenching process method for heavy-load gear steel. In order to solve the problems of long cycle, low efficiency and high cost of heavy-load gear with large carburized layer in the conventional carburizing process, and the problems of grain coarsening and poor comprehensive performance in the high-temperature carburizing process, the present application can shorten the carburizing cycle and save energy consumption by increasing the carburizing temperature to accelerate the diffusion rate of carbon atoms. At the same time, the present application can refine the original austenite grains and improve the comprehensive performance of the structure through the double quenching process, thereby avoiding the problems of high cost of micro-alloying of raw materials and complicated pre-carburizing + re-carburizing process in the prior art.

The invention relates to a vibration mechanism for a well cementation process and a casing string. The vibration mechanism comprises a driving part and a driven part connected with the driving part and the sleeve in series. And a vibrating piece is arranged on the driven piece. The driving part is constructed to enable the driven part to rotate under the action of fluid in the casing string, so that the vibrating part enables the casing string to vibrate through the driven part, cement paste in an annular space between the casing string and the well wall is vibrated, the cement paste between the casing string and the well wall is more compact, and the well cementation quality is effectively improved. The vibrating mechanism can be combined with tools such as a float collar and a float shoe and can vibrate on the lower middle portion of the casing string, and the vibrating effect on cement paste between the casing string and the well wall is improved. And after the vibration mechanism can be combined with tools such as a float collar and a float shoe, the vibration mechanism can enable the casing string to vibrate only under the action of fluid with pressure pulses, the starting condition of the vibration mechanism is improved, and mistaken starting of the vibration mechanism during operation is effectively avoided.

The application discloses a method for preparing Si-Hf-Yb co-deposition coating on the surface of a TiAl alloy, and the co-deposition coating has a multilayer structure and is composed of an outer Hf and Yb rich silicide surface layer, a TiSi2+Ti5Si3 outer layer, a TiSi2+Ti5Si3+Ti(Al,Si)2 transition layer and a TiAl2 inner layer from outside to inside. The method comprises the following steps: 1, preparing a pretreated TiAl alloy; 2, preparing a penetrant; 3, sealingly embedding the pretreated TiAl alloy into the penetrant; and 4, diffusion pack cementation. The method adopts the diffusion pack cementation process, controls the composition of the penetrant and the process conditions, realizes the simultaneous co-deposition of Hf and Yb and Si, makes Yb and Hf in the penetration layer doped into the SiO2 oxide film after oxidation, plays the role of optimizing the structure of the oxide film and inhibiting the growth of the oxide film, effectively improves the high-temperature oxidation resistance of the TiAl alloy, and is suitable for the field of aerospace.

The application discloses a kind of core for measuring sand prevention and sand suppression effect and manufacturing method, belong to oil and gas field development technical field.Core includes shell and inner core filled in the inside of shell;The shell is the hollow cylindrical shell with one end sealed and the other end opened;The opening of the shell is provided with consolidation part;The consolidation part is composed of epoxy resin, curing agent and sand particle.To solve the technical problems that the cementation degree of rock and sand particle cannot be observed, it is difficult to restore the cementation process of bottom sand particle and the cementation degree of rock formation, and the recovery rate cannot be effectively improved in the prior art.