915 results about "Impact toughness" patented technology

The invention provides a low-temperature-impact-resistant food packaging material and a preparation method and application thereof.The low-temperature-impact-resistant food packaging material is prepared from, by mass, 100 parts of polylactic acid, 1-10 parts of modified layered double hydroxide and 5-40 parts of hyperbranched polyester; wherein the modified layered double hydroxide is obtained by treating layered double hydroxide with a composite anionic surfactant and then treating the treated layered double hydroxide with an organic cationic compound with a long alkyl chain; the composite anionic surfactant comprises a first anionic surfactant and a second anionic surfactant; wherein the first anionic surfactant comprises sodium dodecyl sulfate; the second anionic surfactant comprises a sulfonate anionic surfactant containing an amido bond and a catechol structure. Through the formula design, the impact toughness of the material at low temperature can be improved while the mechanical property of polylactic acid is maintained, and the material can be suitable for the field of food packaging.

The application discloses a kind of thick gauge 430 ferritic stainless steel laser weld low-temperature rollability processing method, comprising: using-1~‑2mm negative defocusing+8~10kW low-power laser welding, the grain of heat-affected zone is refined;NiCr-3 welding wire is preheated to 300~400℃ and carried out hot wire laser welding, reduces cooling rate;Weld is implemented 700 DEG C / 10-12 seconds short time induction annealing, decomposes martensite and releases residual stress;Weld is inducted to ≥50 DEG C before rolling and restores plasticity;Optimize five rack continuous rolling parameter, and the reduction of first rack is reduced to 15%-20%.The application is by welding-heat treatment-rolling whole process synergic control, makes weld low-temperature cracking rate from 2.6 times / month reduce to 1 times below, and-10 DEG C impact toughness is promoted to 22J, cup convexity qualification rate reaches 95%, and annual economic benefit is greatly improved, applicable to the thickness 3.0~8.0mm 430 stainless steel cold rolling production, solves the technical problem that thick gauge 430 stainless steel weld is easy to crack under low-temperature environment.

The invention discloses 15Ni steel for an ultralow-temperature liquid hydrogen storage tank and a preparation method of the 15Ni steel, and belongs to the technical field of metallurgy. The 15Ni steel comprises the following chemical components in percentage by mass: 0.02%-0.07% of C, 0.10%-0.30% of Si, 0.20%-0.80% of Mn, 0.15%-0.30% of Mo, 0.020%-0.050% of Al, 12.5%-15.5% of Ni, 0.0015%-0.0060% of N, less than or equal to 0.008% of P, less than or equal to 0.002% of S, less than or equal to 0.020% of Nb, less than or equal to 0.080% of V, less than or equal to 0.020% of Ti and the balance of Fe and inevitable impurities. The preparation method comprises the procedures of smelting, continuous casting, heating, rolling and heat treatment. The steel plate produced by the invention has excellent ultralow temperature (-269 DEG C) impact toughness, effectively solves the problems of brittle phase martensite precipitation and low strength of stainless steel at a low temperature of-196 DEG C, can replace stainless steel to be widely used for manufacturing large ultralow temperature liquid hydrogen storage tanks, and has wide application prospects.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention relates to the field of ferrous metallurgy and forge piece manufacturing, in particular to high-toughness, ultra-pure and large-quenching-depth 40CrNiMoRE rare earth special steel for a large ring piece and a preparation method of the high-toughness, ultra-pure and large-quenching-depth 40CrNiMoRE rare earth special steel. The invention relates to a high-temperature-resistant steel material, which comprises the following chemical components in percentage by weight: 0.3 to 0.5 percent of C, 0.1 to 0.5 percent of Si, 0.4 to 0.8 percent of Mn, 0.5 to 1.5 percent of Cr, 0.5 to 1.5 percent of Ni, 0.1 to 0.5 percent of Mo, 0.05 to 0.30 percent of V, 0.0005 to 0.0030 percent of B, 0.005 to 0.030 percent of RE and the balance of Fe and inevitable impurities. Through V, B and RE comprehensive microalloying, molten steel purification, inclusion modification and grain refinement, the hardenability is improved, and the surface quenching layer depth, hardness uniformity and impact toughness are ensured. And moreover, the high-toughness, ultra-pure and large-quenching-depth large ring piece is obtained through preparation technologies such as pure smelting, airtight protection pouring and uniform deformation, and the technical problems that an existing large ring piece is low in purity, poor in toughness, insufficient in hardenability, cracked in surface quenching and the like can be effectively solved.

The invention discloses a preparation method of a high-impact-toughness super-large-specification Ti80 titanium alloy ring forging, and belongs to the technical field of high-quality titanium alloy materials. The method comprises the following steps: preparing a cast ingot; the prepared cast ingot is subjected to multi-heating-number forging, and a cake blank is obtained; the prepared cake blank is subjected to ring rolling forging, and an annular blank is obtained; and the prepared annular blank is subjected to heat treatment, and the titanium alloy ring forging is obtained. According to the titanium alloy ring forging process adopted by the invention, on the premise of eliminating the longitudinal welding seam, the overall structure uniformity of the pressure-resistant shell can be ensured, and the mechanical property is stable. By designing a reasonable processing route and formulating optimal processing parameters, the uniformity of the material structure is improved, and the manufacturing safety and reliability of the pressure-resistant shell are improved. The method is suitable for preparing the Ti80 titanium alloy ring forge piece with the outer diameter of 4000-10000 mm, the wall thickness of 100-500 mm and the piece weight larger than or equal to 8 t.

The invention relates to the technical field of pipeline steel for oil and gas transmission, in particular to a novel low-C low-Cr corrosion-resistant pipeline steel plate, a preparation method and a pipeline steel pipe, and the novel low-C low-Cr corrosion-resistant pipeline steel plate comprises the following chemical elements: less than or equal to 0.03 wt% of C, less than or equal to 0.025 wt% of Sb, 0.50-1.20 wt% of Al, 0.0005-0.0012 wt% of Mg, 0.0012-0.0042 wt% of Ca, less than or equal to 0.50 wt% of Cr, 0.10-0.30 wt% of Ni, 0.10-0.30 wt% of Si, 1.20-1.80 wt% of Mn, 0.10-0.30 wt% of Mo, 0.02-0.06 wt% of Nb, 0.03-0.08 wt% of V, 0.01-0.03 wt% of Ti, less than or equal The manufactured steel plate is low in manufacturing cost, excellent in yield strength, tensile strength, ductility, impact toughness, corrosion resistance, hydrogen induced cracking resistance and other mechanical properties and suitable for seabed and land oil and gas conveying pipeline engineering in the high Cl <-> and CO2 / H2S corrosion environment.

The invention belongs to the field of novel polyamide composite fiber materials, and particularly discloses a high-toughness polyamide fiber composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 55-75 parts of long-chain polyamide PA610 resin, 10-25 parts of ultra-high molecular weight polyethylene fiber, 8-18 parts of polyether block amide elastomer, 1.5-4 parts of a compound nucleating agent, 0.8-2 parts of a titanate coupling agent and 0.3-1 part of a composite antioxidant. The preparation method is characterized by comprising the following steps: firstly, carrying out surface pretreatment on the ultra-high molecular weight polyethylene fiber by adopting a low-temperature plasma technology so as to improve the interfacial compatibility of the ultra-high molecular weight polyethylene fiber and a resin matrix; and then carrying out melt blending granulation on the pretreated fiber and other raw materials through a twin-screw extruder, wherein the fiber is added from a side feeding port to avoid excessive shearing and breaking. The obtained product has ultrahigh impact toughness, excellent rigidity, excellent low-temperature toughness and heat resistance, and is especially suitable for the fields of manufacturing automobile parts, sports protection equipment and the like with extremely high requirements on toughness and durability.

The invention relates to the field of building materials, and discloses high-toughness and high-energy-absorption polymer emulsion modified mortar and a preparation method thereof, and the mortar is composed of ordinary Portland cement, river sand, a polymer emulsion, water, an active admixture and chopped fibers. Wherein the polymer emulsion is selected from styrene-acrylic emulsion (SBR), ethylene-vinyl acetate (EVA), polyurethane emulsion or a combination thereof; the mixing amount is 5-20wt% of the mass of the cementing material. According to the invention, a viscoelastic network is formed in a cement matrix through the polymer emulsion, and the synergistic effect of the active admixture and the chopped fibers is combined, so that the bonding strength, the crack resistance, the impact resistance and the stress wave dissipation capability of the mortar are remarkably improved. Test results show that the mortar provided by the invention is obviously superior to ordinary mortar in the aspects of 28d breaking strength, impact toughness and stress wave attenuation performance, and is suitable for high-performance constructional engineering and protective engineering.

The invention discloses a method for improving impact toughness of aluminum-containing ultrahigh-strength steel. The method comprises the following steps: forging an aluminum-containing ultrahigh-strength steel cast ingot; carrying out two-stage hot rolling on the forged ultrahigh-strength steel, and carrying out water cooling treatment after hot rolling; the hot-rolled ultrahigh-strength steel is annealed at the annealing temperature of 800 + / -50 DEG C, heat preservation is conducted for a period of time, furnace cooling is conducted to 600 + / -50 DEG C, and discharging and air cooling are conducted; the ultrahigh-strength steel is subjected to solid solution and aging treatment, the solid solution process comprises the steps that a heat treatment furnace is heated to 950-1000 DEG C for charging, heat preservation is conducted for 30-40 min, then oil cooling is conducted, the aging process comprises the steps that heat preservation is conducted for 55-65 min at the temperature of 500-550 DEG C, and then air cooling is conducted. The technology is scientific and reasonable, the toughness of the aluminum-containing ultrahigh-strength steel is greatly improved while the strength of the ultrahigh-strength steel is guaranteed through the combination of two-stage rolling and the reasonable heat treatment technology, and therefore the service safety of the aluminum-containing ultrahigh-strength steel is improved.

The invention relates to a preparation method of bainite steel with high toughness and strength at low temperature, and the strength and toughness of the bainite steel at low temperature are improved by designing process parameters and steel ingot components. The bainite steel with high toughness and strength at low temperature is finally obtained by designing the components of the steel ingot, avoiding the addition of elements such as nickel, molybdenum and vanadium, reducing the material cost and the processing difficulty and accurately controlling the cooling rate of heat treatment. The prepared bainite steel is composed of strip-shaped bainite and thin strip-shaped retained austenite, and the volume fraction of the retained austenite is 5-10%. The tensile strength is not lower than 1240 MPa, the normal-temperature impact is not lower than 120 J, and the impact toughness at-40 DEG C is not lower than 80 J.

The invention relates to the technical field of fiber reinforced composite materials, in particular to a basalt fiber reinforced composite board in a dynamic heavy load environment and a preparation method. The basalt fiber reinforced composite board comprises an upper surface layer, an upper reinforcing layer, a core layer, a lower reinforcing layer and a lower surface layer. According to the invention, rigid nanoparticles and carboxyl-terminated nitrile rubber are introduced to construct a rigid-flexible composite toughening system, and nano aluminum oxide and silicon dioxide are taken as rigid particles and are uniformly dispersed in an epoxy cross-linked network, so that slippage and crack propagation of molecular chains can be effectively hindered, and the rigidity and damage resistance of a matrix are improved; meanwhile, the carboxyl-terminated nitrile rubber is used as reactive liquid rubber, after carboxyl of the carboxyl-terminated nitrile rubber reacts with epoxy groups, the carboxyl-terminated nitrile rubber is distributed in a matrix in a sea-island structure and can serve as stress concentration points, a large amount of crazing and shear bands can be induced, and a large amount of impact energy can be consumed; and the impact toughness is greatly improved while the high strength of the material is maintained.

The preparation method of the A1-grade nondestructive inspection high-impact-toughness TC4 titanium alloy large-size bar comprises the steps that a secondary finished product cast ingot is subjected to a multi-heating-number high-temperature single-phase beta-region large-deformation forging process in the cogging stage, and as-cast grains are fully crushed and refined in the modes of axial upsetting, lateral upsetting, diagonal upsetting and the like; then, high-low-high-low repeated forging is conducted at the temperature above and below the phase transformation point, grain homogenization is achieved through high-temperature dynamic recrystallization, an original grain boundary is eliminated, and deformation dead zones of a corner angle area are effectively reduced in combination with multi-heating-number diagonal drawing-out forging; and finally, multi-heating-number forging is conducted in the two-phase region, a heat treatment process is combined, the microstructure form is further optimized, and a lamellar alpha structure is controlled to guarantee the low-temperature impact performance. According to the method, the structure uniformity of the TC4 alloy bar can be remarkably improved, the A1-level nondestructive testing requirement is met, and the method has excellent axial and chordwise mechanical properties and is suitable for ocean equipment and other high-end application fields with strict requirements for the comprehensive performance of materials.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

Provided is a steel sheet for a CO2 transport line pipe that is suitably provided to a pipeline for transporting a liquid and / or supercritical state CO2. A steel sheet according to the present invention has: a component composition that contains, in mass%, 0.03-0.08% of C, 1.50-2.50% of Mn, 0.030% or less of P, 0.0100% or less of S, 0.0100% or less of N, 0.010-0.200% of Al, 0.10-1.00% of Si, and 0.0005-0.0050% of O, that further contains a prescribed amount of one or more selected from Cu, Ni, Cr, Mo, and W, that exhibits a [Si] / [O] value of 20-900, and in which the remaining portion comprises Fe and unavoidable impurities; a micro structure in which the area ratio of bainite is not less than 90% and the area ratio of island martensite is less than 3%; a strength where the tensile strength is not less than 625 MPa; and a toughness in which the Charpy impact absorption energy at -40°C is not less than 320 J.

This invention discloses a high-strength and high-toughness high-manganese steel plate for ultra-low temperatures and its preparation method. Its chemical composition and mass percentages are: C 0.04–0.10%, Mn 21.0–25.5%, Si 0.25–0.35%, P≤0.008%, S≤0.003%, O≤0.003%, Ti 0.02–0.05%, W 0.01–0.05%, with the balance being Fe and unavoidable impurities. The high-manganese steel plate has a stacking fault energy of 40–45 mJ / m at -196℃. 2 This steel plate achieves its design by controlling the stacking fault energy to 40–45 mJ / m. 2 This ensures that the steel undergoes a strong TWIP effect in the subsequent heavy impact pre-hardening step, forming a gradient nanocrystalline layer on the steel surface, which significantly improves the yield and tensile strength of the steel; it can improve the uniformity of the internal structure of the steel plate and significantly improve the low-temperature impact toughness of high manganese steel, with an impact toughness AKV≥200J at -196℃.

The application discloses a process method for improving toughness of X70 anti-large-deformation pipeline steel, and ideal mechanical properties and organizational morphology are obtained through control of components, continuous casting, heating, rolling, cooling and other processes, finally, the organizational morphology of 70-80% ferrite and hard phase components such as bainite and martensite is obtained, the uniform elongation and toughness of the pipeline steel are improved, the yield strength ratio is low, and the deformation resistance and anti-large-deformation capacity are improved. The X70 anti-large-deformation pipeline steel plate has a Charpy impact toughness of 350 J or more at-20 DEG C, a drop hammer shearing area of 95% or more, a yield strength of 480-550 MPa, a tensile strength of 600-680 MPa, a yield strength ratio of 0.78 or less, a UEL of 12% or more, and a R t1.5 / R t0.5 of 1.15 or more. The product is widely applied to pipeline engineering prone to large plastic deformation such as ground slip deformation in earthquake-prone areas, ground liquefaction settlement caused by permafrost and submarine pipeline laying.

The invention discloses a preparation method of a rare earth microalloyed high manganese steel wear-resistant part, and belongs to the technical field of wear-resistant materials. The preparation method of the rare earth microalloyed high manganese steel wear-resistant part comprises the following steps that C, Mn, Si, Cr, Mo, Y-based heavy rare earth alloy, silicon-aluminum-barium-calcium alloy and Fe are weighed according to the mass percent, and after electric arc furnace smelting and silicon-aluminum-barium-calcium alloy deoxidation pretreatment, secondary rare earth feeding and alloying are adopted, feeding the residual alloy wires into the pouring cup during pouring; and the molten steel is cast after standing, and a casting blank is subjected to water toughening treatment. Through two-stage rare earth feeding, rare earth burning loss is reduced, a uniform strengthening phase is formed, precise process parameters are matched, the problem of obdurability imbalance of traditional high manganese steel is solved, the hardness, impact toughness and wear resistance of a wear-resistant part are improved, the wear-resistant part is suitable for mine crusher hammerheads and excavator bucket teeth, the service life is prolonged, the process is controllable, and the wear-resistant part is suitable for industrial production.

The invention discloses a high-rigidity and high-toughness polypropylene composite material and a preparation method thereof, the high-rigidity and high-toughness polypropylene composite material comprises 55-70 g of homo-polypropylene, 10-20 g of anti-impact co-polypropylene, 18-25 g of surface modified talcum powder, 3-6 g of chopped glass fiber, 8-12 g of ethylene-octylene copolymer, 3-5 g of maleic anhydride grafted polypropylene, 0.5-1.0 g of polyethylene wax, and 0.3-0.5 g of an antioxidant 1010 and 168 (1: 1) mixture. The invention realizes the following effects: 1, a robust rigid-tough balance design: a reinforcing system with high-content talcum powder as a main body and low-content glass fiber as an auxiliary is adopted to cooperate with a POE (ethylene-octylene copolymer) flexibilizer, so that good low-temperature impact toughness is maintained while the bending modulus stably reaches 2500MPa or above; 2, interface compatibility optimization: the interface combination of the inorganic filler and the matrix is improved through PP-g-MAH, and the dispersity and the mechanical property stability are improved; and 3, process control: through optimized temperature and vacuum degree control, degradation is prevented, good performance reproducibility is ensured, and industrial production is easy.

The invention relates to the technical field of research and development of low-temperature bolt steel, and discloses a low-temperature impact performance control process for low-temperature bolt steel. Comprising the steps that S1, in the steelmaking refining stage, purity and uniformity control is conducted, S2, casting blank homogenization treatment is conducted, stress relief and structure regulation are conducted, S3, a heat treatment core process is conducted, structure and toughness balance regulation is conducted, and S4, online detection and dynamic feedback are conducted, and performance stability is guaranteed. By accurately controlling the element proportion of carbon (C), silicon (Si), manganese (Mn), chromium (Cr) and molybdenum (Mo) in steel and combining with an optimized heat treatment process (such as 860 DEG C oil quenching and 640-650 DEG C high-temperature tempering, and the heat preservation time is prolonged to 120 minutes or more), the V-shaped notch impact energy of the material in the environment of-101 DEG C stably reaches 35 J or more, the impact energy of part of samples can reach 50 J or more, and the impact energy of the part of samples can reach 50 J or more. The problem that the low-temperature impact performance is insufficient after wire hardening and tempering is thoroughly solved, and it is ensured that the brittle failure resistance of the bolt is remarkably improved in the ultralow-temperature environment.

The invention discloses daily high-strength environment-friendly ceramic and a preparation process thereof, and particularly relates to the field of ceramic materials, and the preparation process comprises the following steps: S1, preparation and molding of green body powder, S2, preparation of multifunctional glaze slip, and S3, glazing and sintering. By introducing the pre-compounded reinforced fiber, the SiO2-Al2O3 coating on the surface of the pre-compounded reinforced fiber and the ceramic matrix form strong interface bonding at high temperature, so that the comprehensive mechanical property of the green body is improved, the load is effectively transmitted and dispersed, and meanwhile, the fiber has remarkable toughening and impact resisting effects; due to the addition of the biomass derived porous carbon powder, the fracture toughness and thermal shock resistance of the material are further improved through the pore-forming and buffering effects of the biomass derived porous carbon powder; while high bending strength is maintained, impact toughness is improved in a breakthrough manner, and the composite material is more suitable for collision scenes in daily use.

The invention discloses a method for refining and homogenizing crystal grains of a 9%-12% Cr steel thick-wall large forge piece, and belongs to the field of ferrous metallurgy. According to the method, the large forge piece is heated to be close to the critical point of the complete austenitizing temperature in a stepped mode, the large forge piece is subjected to heat treatment by regulating and controlling dispersive precipitation of carbides in an initial structure and uniform nucleation of austenite and / or introducing a small amount of undissolved ferrite, residual precipitated phases and multi-phase interfaces and controlling the cooling speed; nucleation particles of pearlite transformation in the vibration heat preservation process are remarkably increased, uniform distribution of granular pearlite in the supercooled austenite is promoted, structural inheritance is cut off and eliminated, and the purpose of grain refining and homogenizing after performance heat treatment is achieved. According to the method, the grains of the thick-wall large forge piece are refined to 5 grades or above, the cross section grain size difference is within 2 grades, a series of problems that in the production process, grass waves exist in ultrasonic flaw detection, the grain size is unqualified, and the low-temperature impact toughness does not reach the standard can be solved, the product percent of pass and the production efficiency are remarkably improved, and meanwhile the production energy consumption is reduced.

The invention relates to the technical field of solid waste resource utilization and building materials, in particular to magnesium slag-based aggregate and a preparation method thereof. According to the specific technical scheme, the industrial magnesium slag is ground into powder; performing surface activation and organic-inorganic hybrid coating modification on the waste tire rubber powder; grading and mixing the magnesium slag powder, the modified rubber powder and a chemical foaming agent to obtain a composite dry material; mixing and granulating the composite dry material and a special bio-based composite cementing solution; and finally, the raw material balls are placed in an alkaline carbon dioxide-rich atmosphere for low-temperature carbonization maintenance. The bio-based cementing solution is stably cured through mechanisms such as ionic crosslinking, mineralization induction and organic-inorganic network interpenetration. The obtained aggregate has a compact shell structure, the bulk density is 650-850 kg / m < 3 >, the cylinder compressive strength is 6-12 MPa, the water absorption rate is lower than 10%, the impact toughness is excellent, efficient synergistic utilization of various solid wastes is achieved, high-temperature sintering is not needed in the process, and low carbon and energy saving are achieved.

The application relates to a UHPC material for a bridge expansion joint and a preparation method thereof, and comprises the following steps: S2, nanometer carbon fibers are stirred with residual silica fume in a premixing bin at high speed for 2 minutes, so that the silica fume wraps the nanometer carbon fibers and prevents electrostatic agglomeration; after premixing, the mixed powder is sequentially sent into a vortex chamber and an ultrasonic atomization cavity through compressed airflow, and the fiber flows through a piezoelectric ceramic array high-frequency vibration to make the fiber bundle dissociate into a single state; S3, the atomized fiber aerosol passes through a porous diffuser and is sprayed into a planetary mixer through a second feeding port at a certain angle to participate in the mixing in step S1; and S4, steel fibers are sent into a vibrating screening box, and the adhered steel fiber groups are separated through high-frequency vibration, and the separated steel fibers enter the planetary mixer through a third feeding port to participate in the mixing in step S1. The steel fibers and the nanometer carbon fibers uniformly distributed in the UHPC material form a double anti-cracking mechanism, and the impact toughness of the UHPC material is improved.

The invention discloses a microalloyed high-toughness martensitic stainless steel cutter head as well as a preparation method and a preparation mold thereof. Stainless steel comprises the following components in percentage by weight: 0.3%-0.7% of C, 0.3%-1.0% of Si, 0.5%-1.5% of Mn, 16%-18.5% of Cr, 1%-2% of Ni, 0.3%-0.8% of Mo, 0.1%-0.35% of V, 0.1%-0.25% of Nb, less than or equal to 0.02% of S, less than or equal to 0.02% of P and the balance of Fe. Firstly, raw materials are smelted into molten iron; then adding a deoxidizing agent and precoated sand into the molten iron for molding, and performing sand mold casting and pouring to obtain a cutterhead blank; carrying out heat treatment on the cutter head blank; and finally, shot blasting and polishing are conducted on the cutterhead subjected to heat treatment. The martensitic stainless steel cutterhead has a metallographic structure which takes a martensitic structure as a main structure, takes austenite as an auxiliary structure and dispersedly distributes CrC, VC and NbC particles, the hardness of the martensitic stainless steel cutterhead is 40-45 HRC, the impact toughness of the martensitic stainless steel cutterhead reaches 92-95 J / cm < 2 >, the abrasion resistance of the cutterhead is longer, the service life of the cutterhead is longer, and the abrasion loss of the martensitic stainless steel cutterhead is reduced by 70% compared with a cutterhead without alloy elements.

High-toughness, low yield ratio and low longitudinal-transverse strength anisotropy YP460MPa grade weathering steel plate and its manufacturing method, the component weight percentage is: C 0.04~0.08%, Si≤0.20%, Mn1.10~1.50%, P≤0.018%, S≤0.003%, Cu 0.25~0.40%, Ni 0.15~0.45%, Cr0.35~0.65%, Nb 0.015~0.040%, Ti 0.008~0.016%, Als 0.040~0.070%, N≤0.0050%, Mg 0.0010~0.0040%, the balance includes Fe and other inevitable inclusions.The application obtains high strength, excellent low temperature toughness, low yield ratio, high weather resistance and low longitudinal-transverse strength anisotropy of the base material weathering steel plate, and the low temperature toughness of HAZ is also excellent when large heat input welding, that is, the base material weathering steel plate-40℃ impact toughness KV2≥120J, the welding heat affected zone-40℃ Akv≥60J, and it is particularly suitable for the steel structure of ocean platform, cross-sea bridge, water and electricity metal structure component, port machinery and engineering machinery in cold regions.

The invention relates to a delayed fracture resistant non-quenched and tempered 14.9-grade high-strength cold heading steel wire rod and a preparation method thereof. The wire rod comprises the following chemical components: 0.33%-0.55% of C, less than or equal to 0.10% of Si, 1.5%-2.3% of Mn, 0.4%-0.6% of Cr, 0-0.04% of Nb, 0-0.1% of V, 0-0.1% of Ti, 0.004%-0.008% of B, more than or equal to 0.020% of Als, less than or equal to 0.040% of Alt, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 1ppm of H and the balance of Fe and impurity elements. Fine control is adopted in the steelmaking process, the H content is strictly controlled to be lower than 1 ppm, a hydrogen trap is manufactured by adding microalloy elements such as Nb, V and Ti, and the delayed fracture resistance is improved; the air cooling speed of the rolled hot-rolled wire rod is precisely controlled, so that the structure of the hot-rolled wire rod is lath bainite, and high strength is realized by utilizing a medium-carbon bainite structure; the finished wire rod has high strength, high plasticity, excellent low-temperature impact toughness and good delayed fracture resistance.

The invention discloses a method for preparing a high-toughness titanium alloy pipe through precision forging and the pipe prepared through the method. The pipe prepared through the method is small in anisotropy, the strength in all directions reaches 1100 MPa or above, the ductility reaches 10% or above, the impact toughness reaches 25 J / cm < 2 > or above, and the structure and performance uniformity is good.

The invention relates to the technical field of steel rail shears, and discloses a heat treatment method of a multi-component alloy material for a movable steel rail shear tool, which comprises the following steps: sequentially carrying out solid solution pretreatment, spheroidizing annealing, austenitizing, nitrate bath quenching and tempering on a forge piece, the nitrate bath quenching condition comprises the steps that the austenitized forge piece is transferred into a first-section nitrate bath, the temperature interval of the first-section nitrate bath is Bs to Ms, the cooling gradient is 5-8 DEG C / min, then the austenitized forge piece is transferred into a second-section nitrate bath, the temperature interval of the second-section nitrate bath is Ms to Ms-(30-40) DEG C, the temperature gradient is 6-10 DEG C, and heat preservation is conducted for 8-15 min after each gradient is finished; according to the method, the impact toughness of the steel rail scissor tool under the condition of-40 DEG C can be remarkably improved, and the use reliability of the multi-element alloy material for the steel rail scissor tool in the alpine region is remarkably improved.

The invention discloses steel for a 420 MPa grade arctic circle oil and gas exploitation platform and a preparation method of the steel. The steel plate comprises the following chemical components in percentage by weight: 0.06%-0.12% of C, 0.15%-0.35% of Si, 1.00%-1.60% of Mn, less than or equal to 0.008% of P, less than or equal to 0.008% of S, 0.025%-0.060% of Nb, 0.030%-0.080% of V, 0.020%-0.040% of Al, 0.010%-0.020% of Ti, 0.20%-0.60% of Ni, 0.10%-0.30% of Cr, less than or equal to 0.0040% of N and the balance of Fe and inevitable impurity elements. The carbon equivalent CEV is less than or equal to 0.42%, and the cold crack sensitivity index Pcm is less than or equal to 0.20%. The manufacturing process of the steel plate comprises the steps of KR, electric furnace smelting, LF, VD, casting, slab slow cooling, heating, rolling, steel plate pile slow cooling, heat treatment and the like. The matrix structure of the obtained steel plate is a uniform and fine ferrite and tempered pearlite mixed structure, and the grain size ranges from 6 micrometers to 15 micrometers. The steel plate has excellent low-temperature impact toughness, lamellar tearing resistance, fracture resistance and low-temperature strain aging resistance, is easy to weld, and can meet the extremely cold service environment of the arctic circle.