95results about How to "Uniform hardness distribution" patented technology

The invention discloses a high-grade wear-resistant steel plate. The steel plate comprises the following components in percentage by mass: less than or equal to 0.26 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.30 percent of Ni, less than or equal to 1.50 percent of Cr, less than or equal to 0.06 percent of Nb, 0.02 to 0.06 percent of Al, less than or equal to 0.03 percent of Ti, less than or equal to 0.50 percent of Mo, less than or equal to 0.08 percent of V, less than or equal to 0.004 percent of B, and the balance of Fe and inevitable impurities. A method for producing the steel plate comprises smelting, casting, heating, rolling, straightening, shot blasting, quenching, heat treatment, cutting and other process steps. The steel plate has the advantages of steel purity, high strength, high hardness, good low temperature toughness, good weldability, good processability, good cold bending property, large steel plate thickness, good plate cut, little noble metal added to the steel plate and low cost. The steel plate can be widely used in the industry of manufacturing mining, engineering, metallurgical and other machinery with broad application prospects.

The invention relates to a heat treatment method which can obtain the cast iron die material, the hardness of which is controllable and uniform. The heat treatment method has the steps as follows: in the first step, the cast iron die material is put in a vacuum firing furnace for prewarming until the temperature reach 900 to 950 DEG C, and is air-cooled after being taken out of the vacuum firing furnace after austenization; in the second step, a workpiece is put in the vacuum firing furnace, is heated until the temperature reaches 600 to 650 DEG C, is processed through heat preservation, is again heated until the temperature reaches 890 to 900 DEG C, then is taken out of the vacuum firing furnace after being processed through heat preservation, and is quenched in an oil cooling manner, so as to obtain a martensite structure; in the third step, the workpiece is put in the martensite structure for three temperature variations and tempers; wherein, in the first temper, the temperature ranges from 230 to 600 DEG C, and the heat preservation and the oil cooling are executed; in the second temper, the temperature ranges from 230 to 600 DEG C, and the heat preservation and the oil cooling are executed; in the third second temper, the temperature ranges from 250 to 600 DEG C, and the heat preservation and the oil cooling are executed. By the heat treatment method, the hardness of the obtained cast iron die can be controlled between 33HRC and 55HRC in a deterministic manner, the hardness fluctuation can be controlled within 10 percent, and the effect that the whole die is hardened is achieved.

The invention discloses a mechanically actuated chain wheel material, and a manufacturing method thereof. The mechanically actuated chain wheel material comprises following ingredients: 0.2 to 0.35 part of C, 0.35 to 0.55 part of Si, 0.6 to 0.9 part of Mn, Ni<=0.25 part, Cr<=0.20 part, S<=0.02 part, Al<=0.05 part, P<=0.03 part, Cu<=0.40 part, Mo<=0.05 part, V<=0.03 part, Nb<=0.01 part, Ti<=0.01 part, and the balance Fe. The manufacturing method comprises steps of (a) drawing; (b) material preparaing; (c) compacting and shaping; (d) sintering; (e) cooling; (f) rough machining; (g) gear hobbing processing; and (h) heat processing. According to the manufacturing method, the ingredients above are selected so as to obtain chain wheels with uniform strength. In preparation processes, the ingredients are delivered into a mould; a chain wheel blank material is obtained via upsetting extruding, and is subjected to sintering and cooling, so that the internal part of the mechanically actuated chain wheel material is compact, is high in strength, and is not easily fractured; gear hobbing processing is adopted, so that cost is reduced, and processing cycle is shortened; and phenolic aldehyde cloth base laminates are used, so that wear resistance and corrosion resistance of the chain wheels are increased.

The invention belongs to the laser cladding field, relates to a preparation method for a water erosion resistant coating of a last-stage long blade, and particularly relates to a method for preparing a water erosion resistant coating of a last-stage long blade of a large nuclear turbine. The preparation method for the water erosion resistant coating of the last-stage long blade comprises the following steps of drying alloy powder, clamping a blade on a platform with the blade in a horizontal position; selecting a semiconductor laser; adjusting by a coaxially focused powder feeding system; setting the size of a molten pool; and cladding the water erosion resistant coating by the laser. The preparation method can be used in preparing the water erosion resistant coating of the last-stage long blade of the large nuclear turbine. The hardness distribution of a cladding layer is uniform with an up-down deviation within 10% and the hardness of 500 HV; the thermal impact performance and water erosion resistance of the cladding layer are excellent; the deformation of the last-stage long blade after the laser cladding is small; and profile tolerance meets the processing and manufacturing technological requirements of the long blades by nuclear power.

The invention relates to a cast iron horizontal continuous casting double-water jacket type crystallizer, which comprises a double-water jacket type crystallizer steel sleeve and a high-purity graphite sleeve, wherein the high-purity graphite sleeve is embedded in the double-water jacket type crystallizer steel sleeve, the double-water jacket type crystallizer steel sleeve comprises a crystallizer steel sleeve inner sleeve and a crystallizer steel sleeve outer sleeve, the crystallizer steel sleeve outer sleeve is arranged at the exterior of the crystallizer steel sleeve outer sleeve, the crystallizer steel sleeve inner sleeve is provided with a spiral water passage with a trapezoidal cross section, a separating plate is arranged in the spiral water passage with the trapezoidal cross section, and is used for separating the spiral water passage with the trapezoidal cross section into a spiral water passage with a trapezoidal cross section I and a spiral water passage with a trapezoidal cross section II, the crystallizer steel sleeve outer sleeve is respectively welded with a water inlet pipe of a main sleeve A, a water outlet pipe of the main sleeve A, a water inlet pipe of an auxiliary sleeve A and a water outlet pipe of the auxiliary sleeve B, the water inlet pipe of the main sleeve A and the water outlet pipe of the main sleeve A are respectively communicated with the spiral water passage with the trapezoidal cross section I to form the main sleeve A, and the water inlet pipe of the auxiliary sleeve B and the water outlet pipe of the auxiliary sleeve B are respectively communicated with the spiral water passage with the trapezoidal cross section II to form the auxiliary sleeve B. The cast iron horizontal continuous casting double-water jacket type crystallizer has the advantages that the process advantages of horizontal continuous casting using separate control of the two water jackets are fully realized, the leakage of furnaces is avoided, the drawing speed is improved, and the cost is reduced.

A three-dimensionally bending machine comprises a supporting unit to support a workpiece and a feeding unit to feed the workpiece from an upstream side of the workpiece. A heating and cooling unit, provided around the outer circumference of a portion of the workpiece downstream of said supporting unit heats the portion of workpiece in a temperature range for plastic deformation and quenches and rapidly cools the deformed workpiece. A three-dimensionally movable unit, provided downstream of said heating and cooling unit, supports the metal material and controls the supporting position and/or the moving speed of the metal material to apply the bending moment in association with a feed amount, a heating amount, and a cooling amount of the workpiece. Even when a high-strength workpiece is bent, a workpiece having excellent shape fixability and uniform hardness distribution can be made, especially for application to sophisticated automobile parts.

The invention discloses an antiwear laser strengthening cutting pick for a coal mining unit and a processing method thereof. The conical surface of a body of the cutting pick is provided with a laser strengthening layer. The processing method for the antiwear laser strengthening layer comprises the following steps: a laser energy beam is utilized to perform laser cladding, surface alloying or laser quenching strengthening to the conical surface of the cutting pick, thereby improving the hardness and the wear resisting property of the conical position on the end part of the cutting pick, prolonging the wear rate, effectively protecting a hard alloy tool bit, and prolonging the service life of the cutting pick.

The invention relates to a laser-cladding repairing method of a mold with snakeskin grains. The laser-cladding repairing method comprises the following steps of: fixing the mold on a worktable, polishing an oxide layer on the surface of an abraded place of the mold, finishing the oxide layer to form regular geometric shapes and washing a region to be cladded with acetone; compiling a machine tool program according to the cladded position, setting process parameters, staring a laser and carrying out cladding by using a cladding material; cooling and then carrying out dyeing inspection to judge whether a crack defect exists and polishing the cladding layer after judging that the product is qualified; and regenerating snakeskin grains on the surface of the polished cladded layer. According to the laser-cladding repairing method disclosed by the invention, a wire material which is similar to a material of the mold is selected to be used as the cladding material to ensure that the hardness of the cladded region and the hardness of an uncladded region are uniformly distributed, and the generated snake effects of the cladded region and the uncladded region are the same. The mold has little deformation after being subjected to laser-cladding, no sputter generates in the cladding process, snake grains in other regions are not affected, and the thickness of the cladded layer can be well controlled by filling a damaged region with the laser-cladding wire material. The laser-cladding repairing method disclosed by the invention has the advantages of prolonging the service life of the mold and reducing the production cost.

The invention discloses a niobium strengthening wear-resisting submerged arc bead weld flux-cored wire, which comprises a low-carbon steel cored solder wire and a power flux core arranged in the cored solder wire, and is mainly characterized in that the power flux core comprises the following components by weight percent: 30-55% of high-carbon ferrochrome, 4-16% of ferrocolumbium, 3-8% of deoxidant and 25-55% of iron powder. The bead weld layer of the invention has the advantages of evenly distributed hardness and high abrasive resistance; and the welding technological properties thereof are excellent.

The invention relates to a quenching method for a 20CrNiMo material drill bit. The method comprises the following: a first quenching step, which comprises the steps of heating up a drill bit workpiece after being carburized, heat preserving, discharging from a furnace and oil cooling, washing with clear water, first tempering, heat preserving for at least three hours, naturally cooling, and discharging from the furnace and air cooling to the room temperature; and a second quenching step, which comprises the steps of second heating up the drill bit, heat preserving, discharging from the furnace and second oil cooling, extracting oil, washing with clear water, second tempering, and discharging from the furnace and air cooling to the room temperature. Due to the adoption of the two-time quenching process and a display of detected data from a test, the hardness of the workpiece of the 20CrNiMo material drill bit is uniformly distributed, the hardness value of the workpiece of the 20CrNiMomaterial drill bit reaches to Rockwell hardness 58-61, and the metallurgical structure of the workpiece of the 20CrNiMo material drill bit is further refined; moreover, the invention has the advantages of prolonging the service life of the 20CrNiMo material drill bit, increasing economic benefit, reducing replacement times and reducing production cost.

The invention relates to a repairing process and a repairing tool for excircle crack conquassation of tires and carrier rollers of a rotary kiln. According to the invention, a flux-cored wire, of which the tensile strength is 585, is used for padding and isolating; padding, isolating and cladding are conducted twice on a circle of a plano-concave groove, wherein the current is 190, the voltage is 22, and the welding seam is required to be 10 mm higher than the upper part of a groove base metal; then a solid core wire, of which the yield strength is 580, is used for replacing the flux-cored wire to caulk and restore the size, wherein the integral appearance of a concave welding bead is required to be kept during the build-up welding process; segmental welding is adopted on the basis to restore the size; finally, a temper bead is additionally capped; when the size is restored through build-up welding, the internal stress can be lowered to the minimum value, and build-up welding is fulfilled; and on-site heat treatment is carried out immediately. Therefore, the repairing process and the repairing tool have the advantages that the integration of welding material and base metal can be better; the distribution of metallographic structures and hardness is uniform; impact of vertical welding is avoided; the construction is fast; the welding strength is high; the ductility and the toughness are good; wear-resistant, corrosion-resistant, heat-proof, shock-proof and crack-resistant capabilities are excellent; stop time in cement enterprises is reduced; and the production efficiency is improved.

The invention relates to a preparation method of a superhard boron carbide ceramic reinforced iron-based alloy composite wear-resistant coating. The preparation method comprises the following steps: (1) preparing boron carbide ceramic particles and iron-based self-fluxing alloy powder as raw materials; (2) preparing a steel substrate of which the surface is treated to form a surface to be cladded; (3) putting the boron carbide ceramic particles and the iron-based alloy powder into a ball mill for dry ball milling and mixing; (4) adding a binder into the mixed powder, uniformly stirring to form viscous paste, and coating the surface of the steel substrate with the viscous paste; (5) drying after air drying; and (6) carrying out vacuum cladding and then carrying out furnace cooling. The coating prepared by the method provided by the invention has no cracks and micropores penetrating through the whole thickness, is a continuous closed coating, and can significantly improve the wear resistance of mechanical parts, prolong the service life and improve the safety performance.

The invention discloses a tungsten-strengthened wear-resistant submerged-arc overlaying welding flux-cored wire which comprises a low-carbon steel cored solder wire and flux-cored powder arranged in the cored solder wire, wherein the flux-cored powder is mainly characterized by comprising the following components in percentage by weight (%): 30-55% of high carbon ferrochrome, 3-15% of tungsten powder, 3-8% of deoxidizer and 25-55% of iron powder. The overlaying welding layer of the invention has the characteristics of uniform hardness distribution, high wear resistance, excellent welding technological properties and the like.

The invention provides corrosion-resistant steel for an oil well and relates to the technical field of steel. The corrosion-resistant steel is prepared from, by mass, 0.10%-0.20% of C, 0.20%-1% of Si, 0.05%-1.5% of Mn, 4.0%-6.0% of Cr, 0.10-1.0% of Ni, 0.10%-0.8% of Mo, 0.20%-0.80% of Cu, 0.01%-0.10% of Al and the balance Fe and inevitable impurity elements, wherein the total content of the inevitable impurity elements is not higher than 0.5%. The corrosion-resistant steel for the oil well achieves the mechanical properties that the yield strength ranges from 1,020 MPa to 1,150 MPa, the tensile strength ranges from 1,140 MPa to 1,300 MPa, the elongation is around 20%, and the Kv of a 140 ksi steel grade casting pipe product is around 30 J at 0 DEG C. In addition, the corrosion-resistant steel for the oil well belongs to the category of low-alloy steel, and the content of Cr and Ni is low; and the CO2 corrosion resisting performance and the H2S corrosion resisting performance of the steel are improved through the methods such as simultaneously adding a small quantity of elements retarding the anode process and elements promoting the cathode process and the surface activity. The corrosion-resistant steel for the oil well is low manufacturing cost and high in CO2 corrosion and H2S stress corrosion resistance.

The invention relates to a cast steel material for a chain wheel of a marine diesel engine. The cast steel material comprises the following chemical elements in percentage by mass: 0.18-0.21 percent of C, 0.85-1.00 percent of Mn, 0.35-0.55 percent of Si, less than or equal to 0.020 percent of S, less than or equal to 0.020 percent of P, less than or equal to 0.30 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.080 percent of Mo, less than or equal to 0.10 percent of V, less than or equal to 0.080 percent of Al, less than or equal to 0.060 percent of Nb, less than or equal to 0.40 percent of Cu and the balance of Fe element and other inevitable impurities. In the element proportion, the carbon equivalent that CEV is less than or equal to 0.39 percent is met, wherein CEV is calculated by a formula, namely CEV=C%+(Mn%)/6+(Cr%+Mo%+V%)/5+(Ni%+Cu%)/15. In a manufacturing method, raw materials of the chain wheel are reasonably selected and unconventional normalizing thermal treatment is performed, so that the yield of the mechanical property of the chain wheel is increased, the technical problems of low tooth surface hardness and uniformity are solved, the running reliability of the marine diesel engine is enhanced, and production cost is lowered.

The invention discloses a vanadium-reinforced wear-resistant submerged-arc surfacing flux-cored welding wire which comprises a low carbon steel hollow welding wire and a powder flux core arranged in the hollow welding wire, and is mainly characterized in that the powder flux core comprises the following components in percentage (%) by weight: 30-55 percent of high carbon ferro chrome, 8-20 percent of ferro vanadium, 3-8 percent of deoxidizing agent and 25-55 percent of ferrous powder. By using a surfacing welding layer of the invention, the vanadium-reinforced wear-resistant submerged-arc surfacing flux-cored welding wire has the characteristics of uniform rigidity distribution, high wearing resistance and the like, and has good welding process performance.

The invention discloses an organic-inorganic composite coating material, a preparation method, and a method for preparing a wear-resistant coating by using the organic-inorganic composite coating material. The preparation method of the organic-inorganic composite coating material comprises the following steps: taking tetraethoxysilane as a precursor, and adding a silane coupling agent to prepare ahybrid silica sol; and reacting the hybrid silica sol with a titanium dioxide sol to obtain the organic-inorganic composite coating material. A matrix is pretreated, then is impregnated in the organic-inorganic composite coating material for 1-2 min, then is pulled out at a constant speed and stands for 2-4 h, and then the coating material is dried to form the wear-resistant coating on the matrix. The prepared organic-inorganic composite coating material can form the flat and compact coating on the surface of the matrix, so the wear resistance of the matrix is remarkably improved; the preparation method is simple, the production efficiency is high, and the organic-inorganic composite coating material has wide application prospects in the field of explosion-proof materials.

A U-shaped groove surface quenching inductor comprises an induction heating part, a plurality of cooling parts and a supporting rack, the induction heating part and the plurality of cooling parts are fixedly arranged on the supporting rack, the induction heating part is formed by a busbar, an effective loop and a group of magnetizers, the effective loop is a variable cross section structure with the cross section gradually reducing along the length direction, and a cooling hole is arranged in the effective loop; and the group of magnetizers with U-shaped cross section is jointed to the effective loop, and the dimension of the U-shaped cavity of every magnetizer adapts to the dimension of the corresponding effective loop cross section. The variable cross section effective loop is adopted, and the magnetizers change with the effective ring and the part structure, so the U-shaped groove surface quenching inductor has the advantages of high quenching efficiency, uniform hardness distribution, simple structure and low production cost.

The invention belongs to the technical field of welding materials, and particularly relates to a surfacing flux-cored wire with an abrasion-resistant surfacing layer adapting to complex working conditions. The surfacing flux-cored wire comprises a cross core, an outer skin I, an outer skin II and a flux core, wherein the cross core is made of titanium alloy, the outer skin I is made of tantalum alloy, and the outer skin II is made of niobium alloy, and the flux core comprises the following components of 9%-12% of hollow cage-shaped carbon microspheres, 10.2%-12.6% of nano silicon nitride, 3.5%-5.2% of Mg, 2.5%-4.2% of manganese fluoride, 4.2%-5.6% of sodium carbonate and the balance of FHT100.25 reduced iron powder. According to the surfacing flux-cored wire, various carbides and nitridescan be formed in surfacing deposited metal, the hard phases are various and large in number, the abrasion-resistant surfacing layer can adapt to complex working conditions, metallurgical reaction of amolten pool is sufficient, the minimum hardness value of deposited metal is 68.2 HRC, hardness distribution is uniform, and the service cycle of the flux-cored wire is more than three times that of asurfacing layer of a common flux-cored wire.