114results about How to "Reduce decarbonization" patented technology

The invention discloses a wear-resistant hammer head of a hammer crusher with movable installation position and a manufacturing method thereof. The hammer head is manufactured by super-high manganese as raw material by lost foam casting. The hammer head comprises an end part (3) and a handle part (6); hard alloy bars (2) are cast in the two working surfaces of the end part (3) of the hammer head; and an first installation hole (4) and an second installation hole two (5) are formed on the handle part (6) of the hammer head at a distance. The hammer head has good strength and toughness and high hardness and wear resistance and is applicable to the crusher hammer head with single magnitude between 500 and 700 N. When a certain length of the end part of the hammer head is worn, the installation position is moved and the hammer head can be continuously used, being equivalent to replace a new hammer head, so that the purpose of prolonging the service life of the hammer head is fulfilled.

The invention relates to a method for decreasing decarburized layers on surfaces of high-carbon-chromium bearing steel wires. The specific process comprises the steps that steel is molten to obtain molten steel which is subjected to continuous casting to form bearing steel, the bearing steel is subjected to continuous casting to form a bloom, and the bloom is rolled into square hot rolling billet with the section being 160mm*160mm; the surface of the square hot rolling billet is ground, and the grinding amount is 0.5-2mm; the square hot rolling billet is heated in a heating furnace, micro positive pressure control is adopted in the furnace, the pressure in the furnace is 5-40 Pa, the weak oxidizing atmosphere is adopted in the furnace, and the air-fuel ratio is adjusted to enable the oxygen remaining volume in the furnace to be 0-2%; and the spinning temperature is controlled to be 800-850 DEG C, cooling is performed at the rate of 5-10 DEG C/s after spinning to reduce the temperature to 500-600 DEG C, and then slow cooling is performed to obtain hot-rolled wire rods. According to the bearing steel wires obtained through the method, the surfaces are free of fully decarburized layers, and the depth of half decarburized layers is smaller than 50 microns; meanwhile, good component uniformity and internal structure uniformity are achieved, and the product quality requirement of downstream customers can be met; besides, the surface grinding amount of the downstream customers can be reduced, the cost is lowered, and a certain competitive advantage is provided.

The invention belongs to the technical field of rod wire deformation processes in metallurgical industry and particularly relates to a production process for grooveless rolling of an 82B wire rod by a high-speed wire mill. The production process aims that special equipment is not required, the processing cost is low, industrialized production is easy to realize, the steel off-square problem of a grooveless rolling production process is solved, the production accident rate is greatly reduced, the product quality is improved, and the economic benefit is increased. The production process adopts the technical scheme as follows: the production process comprises the following steps: (1) heating a 82B steel billet; (2) rolling by a grooveless flat-roll rough rolling unit, wherein in the rolling process, the extension coefficient of each pass is controlled from 1.20 to 1.45, the broadening coefficient ranges from 0.10 to 0.65, and the running speed of the steel billet ranges from 0.20 m/s to 1.04 m/s; (3) entering an intermediate rolling unit and a pre-finishing unit in sequence for rolling; (4) rolling by a finishing unit; (5) cooling by water and entering a wire-feeding machine to obtain the wire rod; (6) cooling by air, winding and transporting, and finally packaging and warehousing to obtain the finished high-speed 82B wire rod.

The invention discloses a large-scale locomotive connecting rod forging technology which comprises the steps of blanking, lathing, anti-decarburization coating application, blank heating, surface oxidation layer removal, roll forging of blanks, pre-forging, finish forging, trimming, punching and calibration, anti-decarburization coating application and heat treatment. According to the large-scale locomotive connecting rod forging technology, forming can be achieved through one time of heating only. Compared with the traditional technology that heating needs to be conducted twice or more, the technology has the advantages that surface oxidation and decarburization of a connecting rod are effectively reduced, the mechanical performance of the connecting rod is guaranteed, and time and energy resources are saved. Due to the adoption of roll forging of blanks, speed is high, labor is saved, the consistency of manufactured blanks is high, and time and labor are saved during forging in later periods. Due to the fact that high-temperature-resistant and oxidation-resistant anti-decarburization coating application is conducted twice during the whole technology, the decarburized layer on the surface of a final forged piece is thinner than 0.3 mm, and product quality is improved effectively. Due to the fact that the connecting rod forged piece is vertically hoisted for heat treatment, bending deformation of the forged piece is effectively prevented during heat treatment.

The invention discloses a hardening and tempering technology of an alloy-steel tube, and through the technology, the hardened and tempered alloy-steel tube is high in intensity and hardness, has good abrasion resistance and high plasticity, bears great pressure, and has small deformation and less decarburization. The technology comprises the following steps of: (1) annealing treatment: warming to 870-880 DEG C at the speed of 20-25 DEG C/minute, keeping the temperature for 35-40 minutes, and then cooling to 500 DEG C below; (2) quenching treatment: warming to 930-935 DEG C at the speed of 5-10 DEG C/minute, keeping the temperature for 50-60 minutes, then cooling rapidly at the speed of 190-200 DEG C/second to 320-325 DEG C, and cooling naturally to 30-40 DEG C; and (3) tempering treatment: warming to 500-510 DEG C at the speed of 5-10 DEG C/minute, then keeping the temperature for 230-240 minutes, and then cooling naturally to room temperature, thus the hardened and tempered alloy-steel tube is high in intensity and hardness, has good abrasion resistance and high plasticity, bears great pressure, and has small deformation and less decarburization. The hardening and tempering technology of the alloy-steel tube provided by the invention is mainly applied to the hardening and tempering of the alloy-steel tube for a hydraulic cylinder barrel.

The invention relates to a manufacturing method for medium-carbon cold forging steel rods and wires. The method comprises the following steps: low temperature rolling with a finish rolling temperature of 700 to 750 DEG C; rapid air cooling after rolling through cooling to 450 to 550 DEG C at a speed of no less than 0.5 DEG C/s; rapid induction heating pretreatment through heating to 730 to 750 DEG C at a speed of 5 to 15 DEG C/s and heat preservation for 2 to 3 min; and spheroidizing annealing heat treatment through heating to 760 to 780 DEG C with a furnace, heat preservation for 60 to 80 min, cooling to 680 to 710 DEG C, heat preservation for 80 to 120 min and air cooling out of the furnace. With the method provided by the invention, spheroidizing annealing heat treatment time for medium-carbon cold forging steel balls is substantially shortened by more than 50%, and heat treatment efficiency is greatly improved; obtained medium-carbon cold forging steel has at least a same balling rate and same hardness and cold forging performance compared with current medium-carbon cold forging steel annealed for a long time, and high requirements on cold forging steel in the fastener industry are satisfied.

The invention discloses a method for preparing a diesel component by catalytic cracking of coal tar light fraction, which comprises the following step: placing a coal tar light fraction in a catalytic cracking device under conditions of a temperature of between 400 and 450 DEG C, a pressure of 0.05and 0.4MPa and an oil gas airspeed of 0.5 to 2.5 hour<-1> to obtain the diesel component. The method has the advantages of simple flow, high conversion rate and stable operation and belongs to the field of coal tar deep processing.

The invention discloses novel high-strength LPD50 spring steel, and belongs to the field of high-strength spring steel for thermal pressure machining purposes and manufacturing technologies. The novel high-strength LPD50 spring steel is characterized in that the novel high-strength LPD50 spring steel comprises the following components, by mass percent, 0.47-0.53% of C, 0.15-0.35% of Si, 0.75-1.10% of Mn, 0.90-1.20% of Cr, 0.05-0.10% of V, 0.02-0.10% of Nb, 0.15-0.25% of Mo, less than or equal to 0.25% of Cu, less than or equal to 0.25% of Ni, less than or equal to 0.02% of P, less than or equal to 0.015% of S and the balance Fe and unavoidable impurities. The novel high-strength LPD50 spring steel has the excellent characteristics of low carbon removed amount, high strength, high plasticity and toughness, low alloy content and low cost, and can meet the requirements on high stress, high fatigue property, high processing property and high reliability from lightweight flat springs.

A P110 steel level high frequency straight welded pipe manufacturing method comprises (1) taking hot-rolled coil as raw material; (2) shaping the coil into a straight seam pipe by continuous shaping techniques, welding the straight seam on the pipe by a high frequency inductive welding machine to produce a primary pipe, and after the welding, timely removing external and internal burrs of the primary pipe; (3) heating the primary pipe removed of burrs by a medium frequency induction furnace to 920-950 degrees centigrade and conveying it to a hot rolling and diameter reducing machine, rolling the primary pipe into pipe blanks with different apertures by hot mechanical rolling; (4) conducting whole-pipe quenching and tempering to the hot roller pipe blank to produce finished pipe; (5) conducting ultrasonic flaw detection and pipe end magnetic powder inspection to the finished pipe. The invention takes low steel level coil as raw material to produce primary pipe, produces pipe blanks with different diameter specifications by the primary pipe with the same specification, and produces oil casing product with high steel level and high performance by low steel level economical pipe blanks. The working efficiency is high. The production cost is low.

The invention relates to a big-wire diameter suspension helical spring material, which comprises the following chemical components in percentage by weight: 0.429 to 0.529 percent of C, 0.70 to 1.19 percent of Si, 0.50 to 1.20 percent of Mn, 0.50 to 1.20 percent of Cr, 0.01 to 0.07 percent of V, 0.01 to 0.07 percent of Nb, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 5 to 25ppm of O, and the balance of Fe and inevitable impurities. The big-wire diameter suspension helical spring material has technical properties of low decarburization, high strength and high plasticity, has a low alloy content and is a good material for making a helical spring of a suspension having a big wire diameter of a medium or heavy vehicle and also for making a suspension helical spring of a car, a vehicle torsion bar spring and a stock stabilizer, and also a good material used for making a high-strength spring steel wire and an oil tempering spring steel wire.

The invention provides a non-oxidation brazing and thermal treatment device of hard alloy cutting teeth, belongs to the technical field of cutting tools, and mainly solves the problems of the prior art of poor welding quality and thermal treatment effect. The non-oxidation brazing and thermal treatment device comprises a cryogenic box, a nitrogen transporting pipeline, a heating furnace, a quenching tank and a manipulator. The non-oxidation brazing and thermal treatment device is characterized in that the nitrogen transporting pipeline is arranged between the cryogenic box and a working bin, one part of the nitrogen transporting pipeline in the working bin is close to the top wall of the working bin, and oxidation discharge holes formed on the nitrogen transporting pipeline. The heating furnace, the quenching tank and the manipulator are located in the working bin of a sealed structure. A heating operation hole, a heating observation hole, a quenching operation hole and a quenching observation hole are formed at the top of the working bin. A waste gas discharge hole is formed on the lower portion of the working bin or on the side wall close to the bottom. A material inlet is formed on the side wall of one side of the working bin close to the heating furnace, a material outlet is arranged on the side wall of one side of the working bin close to the quenching tank, and a movable sealed device is arranged in the material outlet. The non-oxidation brazing and thermal treatment device reduces energy consumption and saves materials.

The invention relates to a system and a method for directly mineralizing carbon dioxide in flue gas by using gypsum. An absorption tower can sequentially realize cooling, decarburization and escape ammonia trapping processes of desulfurized flue gas; the bottom of a lower cooling section is provided with a slurry area and is circularly connected with an upper ammonium bicarbonate spraying layer, so that the trapping of the waste heat of the desulfurized flue gas can be realized, and heat is provided for the low-temperature concentration and crystallization of ammonium sulfate slurry; the bottom of a middle decarburization section is provided with an ammonium bicarbonate liquid holding layer, and the ammonium bicarbonate liquid holding layer and the ammonium bicarbonate spraying layer form circulation; ammonia is supplemented through an ammonium bicarbonate spraying layer pipeline, so that continuous decarburization reaction can be carried out on cooled flue gas; and meanwhile, the lower cooling section and the middle decarburization section are separated, and a gypsum spraying layer, a demister, a process water spraying layer, a gypsum liquid holding layer and a gypsum spraying layer which are sequentially arranged on the upper deamination section in the height direction form circulating spraying, and the continuous trapping process of escaping ammonia is achieved. The system is simple in structure, reasonable in design and low in smoke decarburization and utilization cost, and meanwhile, continuous online treatment of a large amount of smoke can be achieved.

The invention belongs to the technical field of metal working methods and discloses a method for controlling 16 Mn seamless steel tube blank heating to solve the problem that the performance index of a finished 16 Mn seamless steel tube product is low. The method for controlling 16 Mn seamless steel tube blank heating comprises the steps that an annular heating furnace is adopted for heating a 16 Mn seamless steel tube blank, and the heating process is sequentially divided into a preheating stage, a heating stage and a soaking stage, wherein the heating temperature at the preheating stage is smaller than or equal to 700 DEG C, the heating stage is divided into a low-temperature heating stage and a high-temperature heating stage, the heating temperature at the low-temperature heating stage is larger than or equal to 800 DEG C but smaller than or equal to 1,100 DEG C, the heating temperature at the high-temperature heating stage is larger than or equal to 1,050 DEG C but smaller than or equal to 1,290 DEG C, and the heating temperature at the soaking stage is larger than or equal to 1,260 DEG C but smaller than or equal to 1,300 DEG C. By means of the method, the defect that the yield strength performance index is low is completely eliminated, and the performance percent of pass reaches 100%. The method is suitable for heating of 16 Mn seamless steel tube blanks with various diameter specifications.

The invention discloses an anti-decarbonizing agent for bearing steel thermal treatment for preparing a bearing. The anti-decarbonizing agent is prepared from the following raw materials in parts by weight: 5-10 parts of borax, 5-15 parts of water glass with modulus of 1.5, 1-3 parts of defoamer and 72-89 parts of water. The preparation method comprises the following steps: first, heating water to 60-70 DEG C; adding borax to stir and dissolve; adding the defoamer till borax is fully dissolved; and uniformly stirring and gradually adding water glass with modulus of 1.5 to obtain the anti-decarbonizing agent. The anti-decarbonizing agent disclosed by the invention can form a compact chemical protective film on the surface of bearing steel to prevent a decarbonizing layer from being formed on the surface of the bearing steel due to thermal treatment, so that the grinding allowance can be reduced by 20-30%, thereby improving the processing efficiency. As the compact chemical protective film on the surface of a steel product can isolate corrosion of oxygen and water vapor in a put process after thermal treatment, anti-rust treatment is reduced or avoided. The anti-decarbonizing agent disclosed by the invention is particularly suitable for thermal treatment of a mesh belt furnace.

The invention relates to long-fatigue-life strip steel as well as a preparation method and application thereof, and belongs to the technical field of steel preparation. The long-fatigue-life strip steel is prepared from the following chemical components in percentage by mass: 0.26 to 0.45 percent of C, 0.10 to 0.25 percent of Si, 1.1 to 1.4 percent of Mn, less than or equal to 0.015 percent of P,less than or equal to 0.003 percent of S, 0.015 to 0.08 percent of Al, 0.01 to 0.05 percent of Ti, 0.0010 to 0.0050 percent of B, 0.10 to 0.30 percent of Cr, less than or equal to 0.006 percent of N,and at least one of the following chemical components in percentage by mass: 0.05 to 0.2 percent of Sb, 0.05 to 0.2 percent of Sn, and the balance of Fe and inevitable impurities. A hollow stabilizerbar is prone to surface decarburization in the plurality of heat treatment in the raw material production and follow-up forming process, so that the surface hardness is reduced, and the fatigue life is shortened. The tin/antimony element is prone to enrich on the surface layer of steel to inhibit the diffusion of C from the strip steel, so that decarburization of the surface layer is inhibited. Atleast one of Sb and Sn is added into the chemical components of the material, so that the fatigue life of the final part hollow stabilizer bar is prolonged by reducing surface decarburization of thematerial.

The invention discloses spring steel with the performance of low decarburization, high strength and high ductility, and belongs to the field of spring steel used for hot press machining. The spring steel comprises the chemical components of, by weight, 0.42-0.52% of C, 0.70-1.10% of Si, 0.50-1.10% of Mn, 0.50-1.1% of Cr, 0.01-0.05% of V, 0.005-0.009% of Nb, no greater than 0.025% of P, no greater than 0.025% of S, 5-25 ppm of [O] and the balance Fe and inevitable impurities. Since a spring material has the technicalperformance of low decarburization, high strength and high ductility and is low in alloy content, the spring steelisan excellent material for manufacturing medium and heavy duty truck large-wire-diameter suspension spiral springs, can also be used for car suspension spiral springs, car torsion rod springs and stabilizer bars, and is also an excellent raw material for high-strength spring steel wires and oil tempering spring steel wires. The spring steel is wide in application and suitable for application and popularization in the industry.

The invention discloses a turning tool machining technology capable of reducing heat damage and improving tempering quality. The turning tool machining technology comprises the processes of blank blanking, forging, cutting, heat treatment and grinding in sequence. A blank is W2MoCr4V2Co8 high-speed tool steel. The heat treatment process includes preheating, heating and heat insulation, quenching and tempering in sequence. Preheating is conducted in a staged mode with the temperature gradually increased. An annealing step is further set between the forging step and the cutting step, and according to the annealing step, the forged blank is heated step by step. The turning tool machining technology is simple in circuit, the heat treatment effect is good, the hardness number of the turning tool can be more than 70 HRC, and the good wear resistance and the good heat hardness are achieved.

The invention discloses corrosion-resistant high-strength high-toughness alloy tool steel and a heat treatment method and a production method thereof. The corrosion-resistant high-strength high-toughness alloy tool steel comprises the following chemical components of, in percentage by weight, 0.70%-1.00% of C, 0.80%-1.10% of Si, 0.50%-0.80% of Mn, 0.50%-0.80% of Cr, 0.30%-0.50% of Mo, 0.20%-0.40% of V, 0.020%-0.040% of Nb, 0.030%-0.050% of Ti, 0.15%-0.35% of Ni, 0.15%-0.35% of Cu, 0.05%-0.25% of Re, trace amounts of P, S, O and N and the balance Fe and other inevitable impurities, wherein 0.50 W + 0.50 Mo + 0.26 Cr + V + Nb < = 1.5 C. The discloses corrosion-resistant high-strength high-toughness alloy tool steel has good strength, plasticity and toughness, wear resistance, impact resistance and corrosion resistance, and can meet the use requirements.

The invention discloses a heating method capable of reducing depth of a decarburized layer of GCr15 bearing steel. The heating method comprises the following steps of: preserving the heat of steel billets for 30 minutes at a temperature of 500-600 DEG C in a heat preserving furnace; feeding the steel billets into a step beam type heating furnace to heat in four stages, wherein the temperature at a pre-heating stage is 850-1020 DEG C, a temperature at a heating stage I is 1100-1190 DEG C, heating time of the heating stage I is greater than 35 minutes, a temperature at a heating stage II is 1180-1220 DEG C, a temperature at a uniform-heating stage I is 1180-1220 DEG C, a temperature at a uniform-heating stage II is 1170-1210 DEG C, and heating time from the heating stage II to the uniform-heating stage II is greater than 130 minutes; introducing oxygen gas in a heating process, wherein oxygen gas flow at the pre-heating stage is 80000-90000 m<3>/h, oxygen gas pressure at the pre-heating stage is 8-9 bar, oxygen gas flow at the uniform-heating stage is 140000-150000 m<3>/h, and oxygen gas pressure at the uniform-heating stage is 14-15 bar. The method effectively shortens the heating time, and reduces the depth of the decarburized layer.