32results about How to "Toughness does not decrease" patented technology

The invention discloses a tool for strengthening a blade through the laser cladding technology. The tool comprises a tool body and a handle. The position of a cutting edge line of the tool body is provided with a cladding layer in a cladding manner, wherein the cladding layer is formed by abrasion-resisting hard alloy mixed powder. The hard alloy mixed powder is formed by mixing nickel-base alloy powder and tungsten carbide powder according to the proportion. By mass percent, the nickel-base alloy powder accounts for 40%-70%, and the tungsten carbide powder accounts for 30%-60%. The nickel-base alloy powder comprises, by mass percent, 18%-23% of Cr, 4%-7% of Fe, 2%-4.5% of Nb, 8%-11.5% of Mo, 0.2%-0.4% of Al, 1%-2.5% of Ti, 0.1%-0.6% of C, 0.2%-0.5% of Si, 0.2%-0.6% of Mn, 1.5%-2.5% of V and the balance Ni. The tool has the beneficial effects that the cladding layer and the tool body are in well metallurgy combination, the structure of the cladding layer is fine and uniform, and the dilution rate is low; after the tool body is sharpened, the hardness, sharpness, abrasion resistance and corrosion resistance of a blade part are greatly improved, cost is low, the hardness of the blade part is improved, and meanwhile tenacity cannot be reduced.

The invention provides a high toughness steel for hot bending bent steel and a production method of hot rolling flat plate thereof. The chemical compositions of the steel (weight percentage) comprise: C of 0.04 percent to 0.12 percent, Si of 10 percent to 0.30 percent, Mn of 1.50 percent to 1.65 percent, Nb of 0.04 percent to 0.08 percent, Ti of 0.008 percent to 0.025 percent, Ni of 0.15 percent to 0.36 percent, Mo of 0.15 percent to 0.30 percent, remaining iron and unavoidable impurities. The production method of the hot rolling flat plate comprises smelting, refining outside the hearth and continuous casting. Steel rolling is adopted a controlled rolling controlled cooling technics. The heating temperature of plate blank is ranged from 1160 DEG C to 1220 DEG C. Rough rolling temperature is ranged from 1010 DEG C to 1150 DEG C. Precision rolling temperature is ranged from 800 DEG C to 950 DEG C. Controlled cooling speed after rolled is ranged from 15 DEG C /s to 30 DEG C /s. Terminal cooling temperature is ranged from 450 DEG C to 600 DEG C. The invention has reasonable ingredient design. The production cost of the invention can be reduced about 15 percent compared to the prior art. The hot rolling steel plate of the invention can get composite organization with bainite as main part and has good low temperature toughness. The ballistic power is larger than 220 J in 20 DEG C below zero and the shearing area of DWTT at 15 DEG C below zero reaches up to 90 percent. The yield strength of the product reaches up to 520MPa and the tension resistance reaches up to 570MPa. The hot rolling steel toughness of the invention is not reduced after treatment and has better obdurability.

The invention discloses a duplex stainless steel with pitting corrosion resistance and favourable cold temperature flexibility and a manufacturing method thereof. The duplex stainless steel comprisesthe following components in mass percentage: 0.01-0.10% of C, 0.2-1.0% of Si, more than 0% and less than 1.5% of Mn, 20.0-22.0% of Cr, 1.8-4.0% of Ni, 0.08-0.2% of N, more than 0% and less than 0.5% of Mo, less than or equal to 1.0% of one or more than one of W and Cu and the balance Fe and inevitable impurities. The invention controls Mn content below 1.5% until zero and simultaneously adjusts the content of elements of N, Ni and the like to ensure that steel has high strength, favourable corrosion resistance and favourable impact toughness at room temperature and low temperature when steel contains no or small amount of noble element Mo; meanwhile, the duplex stainless steel has low cost and small hot working difficulty, can be largely applied in the fields of buildings along the coast,petrochemical industry and the like and can replace 304 austenitic stainless steel of which the nickel content is above 8% at room temperature and lower temperature.

The invention discloses a composite membrane reinforced by an inclusion complex of ring molecules and a polymer. The composite membrane is mainly formed by a polymer layer consisting of a linear polymer or a branch polymer and an inclusion complex layer formed by serially sleeving the ring molecules on partial chain links of the polymer which are compounded and accumulated layer by layer. The preparation of the composite membrane mainly comprises the following steps: a polymer component and a ring molecule component are dissolved into a solvent respectively to be prepared into a solution; and a substrate material is alternately immersed into the solution prepared by the polymer component and the ring molecule component, is kept stand for a period of time, and is taken out to remove excessive adhesive substances, and a multi-layer membrane system can be obtained by circulating the process. Compared with the prior art, a supermolecular multi-layer membrane greatly strengthens the mechanical property and the friction-resistant performance of the multi-layer membrane by introducing a self-assembling inclusion component of the polymer and the ring molecules, and has broad varieties of selectable polymers and broad application prospect.

The invention relates to a method for improving properties of H13 die steel by adding nitrogen and belongs to the field of metal materials. In the method, chemical compositions of conventional H13 steel are improved, the strength, hardness and abrasive resistance of the die steel are improved by adding solid solution nitrogen element, and the toughness is not reduced. The nitrogen element is added by a method of adding a chromium nitride preliminary alloy, and other elements are added by a conventional method. In order to ensure yield of the nitrogen element during smelting, and reduce overflowing in the process of smelting and air bubbles during solidification, a smelting temperature is strictly controlled to be higher than a melting point within 50 DEG C, and the casting is quickly performed after the alloys completely smelt. The nitrogenous H13 die steel comprises the following chemical compositions by percentage: 0.28 to 0.40 percent of carbon, 0.8 to 1.2 percent of silicon, 0.2 to 0.5 percent of manganese, 4.75 to 5.5 percent of chromium, 1.10 to 1.75 percent of molybdenum, 0.8 to 1.2 percent of vanadium, 0.02 to 0.08 percent of nitrogen, less than or equal to 0.03 percent of phosphorus, less than or equal to 0.03 percent of sulfur and the balance of Fe. A forge piece after thermal treatment has the following properties: the hardness value is 53 to 55HRC, the tensile strength is over 1,800MPa, the yield strength is over 1,480MPa, the impact absorption power value is between 15 and 16 J, the strength and hardness are higher than those of the H13 steel, and the toughness is not lower than that of the H13 steel.

The invention discloses a low-alloy steel plate and a heat treatment method for the steel plate. The strong-strength low-alloy steel plate comprises the following chemical components in percentage by weight: 0.12 to 0.20 percent of C, 0.20 to 0.60 percent of Si, 1.20 to 1.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, 0.020 to 0.080 percent of Nb, less than or equal to 0.050 percent of V, 0.010 to 0.060 percent of Ti, 0.015 to 0.045 percent of Al and the balance of Fe and trace impurities. According to the low-alloy steel plate and the heat treatment method for the steel plate, the strength loss of the steel plate after heat treatment can be effectively reduced, the yield strength and the tensile strength of the steel plate are strengthened by more than 30MPa compared with those of a conventional normalized steel plate, the alloy element content of the normalized steel plate can be effectively reduced, and the production cost is lowered.

The invention discloses a steel plate for Ni-Mo low-temperature high-ductility X100 pipe fittings. The steel plate is prepared from the following chemical components in percentage by weight: 0.09-0.12% of C, 1.5-1.9% of Mn, 0.1-0.3% of Si, less than or equal to 0.003% of S, less than or equal to 0.015% of P, 0.04-0.065% of Nb, 0.008-0.003% of Ti, 0.02-0.10% of V, less than or equal to 0.06% of Alt, less than or equal to 0.010% of N, less than or equal to 0.006% of O, 0.40-0.50% of Mo, less than or equal to 0.35% of Cu, 0.51-0.65% of Ni, less than or equal to 0.35% of Cr, less than or equal to 0.01% of Ca and the balance of Fe. The manufacturing process of the steel plate comprises liquid steel smelting, external refining, plate blank reheating, TMCP process and quenched-tempered heat treatment; the finished product has high strength and high low-temperature ductility, and is welded and matched with an X100 main body pipeline; the process window of the heat treatment is widened by the ratio of the components Ni and Mo, and therefore, the yield and the percent of pass of the steel products are increased.

The invention relates to a heatproof plastic material and a preparation method thereof, and concretely relates to a heat-conduction heatproof PBT material for LED lamp holders, and a preparation method thereof. The heat-conduction heatproof PBT is mainly composed of a resin matrix, a reinforcing system, a heat conduction system, a lubrication system and an anti-oxidation system, wherein the resin matrix is PBT; the reinforcing system is glass fibers; the lubrication system is a TAF lubricant and calcium stearate; and the anti-oxidation system is an antioxidant 1010. The heat-conduction heatproof PBT material prepared in the invention adopts the glass fibers as a reinforcing skeleton, ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA) as a compatibilizer and filled AlN as a heat conduction factor, so good strength and toughness are maintained on the premise of guaranteeing of the high heat conductivity of the PBT material; and the advantages of workability and low batch production cost of the PBT plastic make the heat conduction plastic be applied in LED lamp holder related fields.

The invention discloses medium-carbon niobium-vanadium microalloying high-speed wheel steel and a wheel preparation method, and belongs to the field of railway wheel preparation. The medium-carbon niobium-vanadium microalloying high-speed wheel steel aims to solve the problems of poor adaptability and low strength and hardness of high-speed wheel steel in the prior art. The medium-carbon niobium-vanadium microalloying high-speed wheel steel comprises the following components of, by weight, 0.52%-0.56% of C, 0.15%-0.40% of Si, 0.50%-0.80% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 0.01%-0.03% of Nb, 0.10%-0.20% of V and the balance Fe and inevitable impurity elements. According to the medium-carbon niobium-vanadium microalloying high-speed wheel steeland the wheel preparation method, Nb and V elements are added to form a brand new component design system, and a corresponding heat treatment process is matched, so that the strength and hardness levels of a wheel are improved by more than 5% compared with those of an ER8 wheel on the premise that the toughness index of the wheel is not reduced, the contact fatigue resistance and the wear resistance are also improved, and the adaptability of the wheel is stronger.

An alloy steel with high toughness and antiwear performance for the rolling roller, impacting hammer, etc contains C (0.33-0.42 wt.%), Si (0.3-0.9), Mn (0.6-1.2), CR (4-5.6) and Fe (rest).

The invention relates to steel for an in-situ nano reinforced and toughened crankshaft. The steel is characterized by comprising the following components in percentage by weight: 0.40 to 0.42 percent of carbon, 0.23 to 0.27 percent of silicon, 0.70 to 0.74 percent of manganese, 1.08 to 1.18 percent of chromium, 0.21 to 0.23 percent of molybdenum, 0.005 to 0.015 percent of titanium, 0.02 to 0.04 percent of vanadium, 0.010 to 0.040 percent of aluminum, 0.014 to 0.025 percent of sulfur and less than or equal to 0.015 percent of phosphorus. According to the steel, trace alloy elements vanadium and rare earth nanowires are added in the refining process, and a series of operations of refining steps are improved, so that a large number of in-situ nano-particles which are dispersively distributed are formed in the processes of steel melt, solidification and the like, the particle size is 2-30 nanometers, the distance between the nano-particles is 20-100 nanometers, 109-1012 nano-particles are contained in each crystal grain, a large number of in-situ nano-particles are dispersed and distributed, so that the generation of columnar crystals is inhibited, fine isometric crystals are formed, macrosegregation is improved, the formation and size of brittle phases are reduced, and the strength and plasticity of the crankshaft steel are improved; the in-situ nanoparticles and the matrix are in a coherent or semi-coherent relationship, dislocation is not easy to accumulate, stress concentration is reduced, so that the toughness is not reduced, and the contradictory problem of strengthening and toughening is solved.

The invention discloses a polyurethane foam based on graphene modification, and particularly relates to the technical field of polyurethane foam. The polyurethane foam is prepared from the following raw materials: polyether polyol, polyester polyol, isocyanate, modified graphene, a foaming agent, a catalyst and a foam stabilizer. Graphene is modified by utilizing isocyanate and doxorubicin hydrochloride, an isocyanate group is introduced to the surface of graphene, the isocyanate group can react with polyether polyol, the purpose of modifying polyurethane foam by graphene polymerization is achieved, doxorubicin hydrochloride is loaded on graphene by utilizing an ultrasonic oscillation mode, a hydrogen bond can be formed between graphene and doxorubicin hydrochloride, the mechanical strength of the polyurethane foam can be effectively improved under the action of an isocyanate group and the hydrogen bond, and doxorubicin hydrochloride contained in the polyurethane foam can effectively achieve antibacterial and bacteriostatic effects, so that the use requirements of people can be met.

The invention relates to the technical field of cylinder sleeve machining, in particular to a slurry pump cylinder sleeve manufacturing method which comprises the steps that firstly, a cylinder sleeve inner container is subjected to rough machining; secondly, the cylinder sleeve inner container obtained after rough machining is subjected to heat treatment; thirdly, the cylinder sleeve inner container subjected to magnetic field heat treatment in the second step is machined and polished; and fourthly, after the cylinder sleeve outer sleeve is heated to 400-500 DEG C, the cylinder sleeve outer sleeve and the polished cylinder sleeve inner container are subjected to embedding and machining, and then the slurry pump cylinder sleeve is obtained. The surface hardness and wear resistance of the prepared inner container are improved, the hardness of the double-metal cylinder sleeve is improved from 58-61 HRC to 63-64 HRC, and meanwhile the toughness and other mechanical properties of the prepared cylinder sleeve are improved.

The invention discloses medium-carbon medium-silicon niobium microalloyed high-speed wheel steel and a wheel preparation method, and belongs to the field of railway wheel preparation. Aiming at the problems that in the prior art, high-speed wheel steel is poor in adaptability and low in strength and hardness, the invention provides medium-carbon medium-silicon niobium microalloyed high-speed wheelsteel. The steel comprises the following components in percentage by weight: 0.50%-0.58% of C, 0.50%-0.80% of Si, 0.50%-0.90% of Mn, 0.02%-0.04% of Nb, no greater than 0.015% of P, no greater than 0.015% of S and the balance of Fe and inevitable impurity elements. The niobium element is added into the components of the wheel steel; niobium and carbon are combined to form niobium carbide, the effect of refining pearlite groups is achieved during steel rolling and heat treatment, meanwhile, it is guaranteed that a certain amount of ferrite is separated out, the strength and toughness matching of the wheel steel is improved, the strength and hardness level is improved by 5% or above compared with an ER8 wheel, and the contact fatigue resistance and wear resistance are also improved. According to the preparation method disclosed by the invention, heat treatment is subjected to process optimization, so that the adaptability of the wheel is further improved, and the wheel has relatively high strength and hardness.