89 results about "Wear corrosion" patented technology

The invention discloses wear corrosion resistant castable prepared from a bauxite-based homogenous material and a preparation method thereof, which belong to the technical field of castable refractory. In the invention, by using the characteristics of the bauxite-based homogenous material, such as homogeneous chemical components and structure, stable performance, mulite main crystal phase, small linear change, high high-temperature strength and certain flexibility due to mutual insertion of micro crystals and the like, the shortcomings of low middle-temperature strength and poor wear resistance and alkali corrosion resistance of the conventional high-aluminum bauxite castable are overcome, and the problems of low middle-temperature strength, poor wear resistance and poor alkali, chloride and sulphur corrosion resistance of the conventional high-aluminum and corundum castable are effectively solved. The wear and corrosion resistant castable with high middle-temperature performance is prepared. The wear corrosion resistant castable and the preparation method thereof have the advantages of small fluctuation of water adding amount in construction, stable usability, reduction rate of partial corrosion, prolonged service life and wide application to a kiln hood, a grate cooler, a tertiary air duct and a decomposing furnace of a dry process cement kiln and relative parts of other ceramic and petrified thermo-technical kilns and the like.

The invention discloses an iron-based nanocrystalline composite coating for protecting a boiler tail heating surface and a laser-cladding forming process of the iron-based nanocrystalline composite coating. The iron-based nanocrystalline composite coating comprises the following components in percentage by weight: 49.9-62.8% of Fe, 14.2-20.4% of Cr, 9.0-16.3% of Mo, 2.9-4.1% of B, 0.6-1.3% of C, 1.0-2.4% of Mn, 3.4-8.0% of W, 1.0-1.9% of Si and 0-3.9% of RE, wherein RE is a rare earth element. The forming process comprises the following steps: preparing alloy powder of the iron-based nanocrystalline composite coating; treating the surface of the boiler tail heating surface; preparing the iron-based nanocrystalline composite coating through a simultaneous powder feeding method and a laser-cladding method, wherein the laser cladding is performed for multiple times. The formed iron-based nanocrystalline composite coating is 1 mm above in thickness. The iron-based nanocrystalline composite coating can obviously enhance the wear resistance and corrosion resistance of the boiler tail heating surface, and reduce maintenance costs of worn and corroded parts and consumption of raw materials of a power plant.

The invention relates to a Cr 23 Ni 6 ferrite-austenitic stainless steel which is manufactured from stainless steel materials containing components by weight percentage as follows: 22 percent to 24 percent of Cr, 5 percent to 7 percent of Ni, 3 percent to 4 percent of Mo, 0.15 percent to 0.25 percent of N, less than or equal to 0.03 percent of C and 1 percent to 2 percent of Mn, and the rest is Fe. The manufacturing technology of the Cr 23 Ni 6 ferrite-austenitic stainless steel of the invention is characterized in that: in hot piercing process, the hot piercing temperature is controlled to be 1150 DEG C to 1200 DEG C; the prior compression coefficient of a piercing plug is controlled to be 5 percent; the reduction of roller waist is controlled to be 12 percent and the ovality is controlled to be 1.08 to 1.11; in cold drawing / cold rolling process, cold deformation quantity is controlled to be below 50 percent; in heat treatment process, the solid solution temperature of products is controlled to be 1080 DEG C to 1100 DEG C and the solid solution temperature of finished products is controlled to be 1050 DEG C to 1100 DEG C. The Cr 23 Ni 6 ferrite-austenitic stainless steel has good chloride stress corrosion resistance, good pit corrosion resistance, high tensile strength and yield strength and good corrosion fatigue resistance and erosion corrosion resistance, and is widely used in the fields such as petroleum industry, chemical industry, natural gas industry and marine shipping and the like.

The invention discloses a process for spraying a composite coating on a metal surface. The process comprises the following steps: carrying out purification treatment on the metal surface; carrying out laser burning treatment on the metal surface; carrying out explosion spray treatment on the metal surface, and preparing the composite coating; carrying out laser re-melting treatment on the composite coating prepared by an explosion spray process, on the metal surface. According to the combined process for spraying the composite coating on the metal surface, the explosion spray process is compounded with two laser heat treatment processes, so that the binding force of the coating and a matrix can be effectively improved, and the performances of corrosion resistance, wear corrosion and the like of the coating can be further improved.

A polished sucker rod is characterized by comprising a substrate and a nickel base alloy coating spray welded on surface of the substrate. The nickel base alloy coating is made of the following materials by mass percent: 0%-0.8% of C, 2.0-4.0% of Si, 1.5%-4.5% of B, 5.0%-14.0% of Cr, 5.0%-15.0% of Cu, no greater than 5.0% of Fe and nickel. The MC polished sucker rod has excellent comprehensive mechanical properties, which significantly enhances the tensile strength, and the nickel base alloy coating on the surface has superior wear resistance and corrosion resistance and better bending resistance, which ensures that the polished sucker rod can better satisfy the high load and wear-corrosion service environment of oil fields.

The invention relates to the fields of stainless steel materials and preparation technology thereof, in particular relates to a corrosion-resistant stainless steel coffee pot material and a preparation method thereof. The corrosion-resistant stainless steel coffee pot material comprises the following chemical components in percentage by mass: 0.03-0.06% of C, 16-20% of Cr, 0.8-1.2% of Si, 0.6-1% of Mn, 2-3% of Ni, 0.0001-0.002% of B, 0.4-0.6% of V, 3-4.5% of Mo, 0.25-0.35% of W, 0.18-0.22% of N, less than or equal to 0.004% of S, less than or equal to 0.014% of P, 0.25-0.35% of Ag, 2.5-3.5% of Cu, 0.001-0.012% of Ce, 0.03-0.08% of La, and the balance of Fe and inevitable impurity elements. The corrosion-resistant stainless steel coffee pot material has strong machining property, wear corrosion resistance and antibacterial property.

The invention relates to a boron-containing high-silicon bainite wear-resistant corrosion-resistant alloy and a manufacturing method thereof. The alloy comprises the following chemical components in percentage by weight: 0.3-0.6% of C, 1.6-2.6% of Si, 0.6-1.0% of Mn, 0.6-4.0% of Cr, 0.3-0.5% of Mo, 0.3-0.5% of Ni, 0.3-0.5% of Cu, 0.1-0.3% of Ti, 0.05-0.1% of B, 0.05-0.15% of Ce, 0.05-0.15% of Nb, less than 0.04% of P, less than 0.04% of S and the balance of Fe. The manufacturing method comprises the following steps: carrying out electric-furnace smelting, carrying out secondary aluminum insertion deoxidization, putting on the bottom of a casting ladle to form a casting, austenizing the casting at 850-950 DEG C, keeping the temperature for some time, putting in a salt bath at 200-260 DEG C to carry out primary isothermal quenching, keeping the temperature for 5-10 minutes, carrying out secondary isothermal quenching in a salt bath at 260-400 DEG C, keeping the temperature for 0.5-4 hours, and cooling in air to obtain the wear-resistant corrosion-resistant alloy of which the austenite-bainite base is distributed with boride. The alloy is low in preparation cost and suitable for marine silt erosion and corrosion environments, has favorable comprehensive properties of toughness, wear resistance and corrosion resistance, and can be used for dredger cutter teeth, slurry pipelines, centrifugal-pump impellers, blades and the like.

An antiwear oil pipe resisting tubercular corrosion is prepared through pretreating oil pipe, gas-phase nitrifying to form the ferric nitride or carbon-contained ferric nitride on the surface of oil pipe, activating, washing, chemical plating a sacrificial anode type protecting layer, and post-treating. Its advnatages are high surface hardness and high resistance to tubercular corrosion, high temp. compression and deformation.

The invention relates to the technical field of thermal spraying and material surface protection, and particularly relates to a method for preparing a high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating by utilizing supersonic spraying and pre-alloyed powder used in the method. Aimed at solving the problems that a common alloy coating prepared in the prior art can be easily dissolved partially in a matrix when being heated and re-melted, crystal grains rapidly grow in a high-temperature molten state, abrasion resistance of the coating is reduced, content of carbide and carbon in a common coating alloy material is low, the wear resistance is generally as good as that of the ceramic coating, so that the application working condition of the common coating alloy material is limited, the following preparation process is adopted for preparing the high-carbon high-alloy amorphous pre-alloyed powder and comprises the following steps of weighing raw materials and mixing the raw materials, adding a cemented carbide ball, a forming agent and a wet grinding medium, and carrying out ball milling under a protective atmosphere; filtering and drying to obtain the pre-alloyed powder; and the pre-alloyed powder is used for preparing the high-carbon high-niobium high-chromium wear-corrosion resistance alloy coating through adopting the supersonic spraying method. According to the method, the coating has the advantages of being high in density and smooth in surface.

The invention relates to low alloy wearing resistance corrosion resistance steel which is suitably used in the ocean mud-sand wearing and corrosive environment, which is produced by the following steps: Mn-Si-Cr-Mo system non-carbide bainite alloy steel is taken as research basis, the carbon content and other alloy element contents are properly adjusted, elements of Al, Nb and rare earth contributing to improving the corrosion resistance of the alloy steel are added for modification, and the Mn-Si-Cr-Mo-Al system non-carbide bainite steel is formed by the progression quenching heat treatment process, so that the low alloy wearing resistance corrosion resistance steel is obtained. The steel has good obdurability, wearing resistant and corrosion resistant comprehensive performance and welding repair performances, and can be used to solve the problem of repairing worn blades of a centrifugal pump of a ship, and can also be applied to other ocean wearing resistance welding parts.

The invention discloses a high-hardness, single-phase and high-entropy alloy coating and a preparation method and application thereof. The preparation method comprises the following steps of mixing Al powder, Fe powder, Co powder, Ni powder, V powder and Ti powder according to the molar ratio of Al:Fe:Co:Ni:V:Ti=(x=1.0-1.5):1:1:1:1:1, and then preparing a AlxFeCoNiVTi high-entropy alloy coating on the surface of a part, wherein x=1.0-1.5, the hardness range of the coating is 800-1100 HV, and the coating is of a body-centered cubic (bcc) single-phase solid solution structure. The body-centered-cubic-structure single-phase solid solution high-entropy alloy coating obtained by a laser cladding method is high in hardness and excellent in electrochemical corrosion resistance, has good wear-corrosion resistance, and is particularly suitable for protecting surfaces of parts such as blades of hydraulic turbines and blades of fans.

The invention discloses an anti-corrosion conductive ceramic electrode material for sewage and sludge treatment and a preparation method of the anti-corrosion conductive ceramic electrode material. The anti-corrosion conductive ceramic electrode material is characterized in that carbon is used as aggregate; the anti-corrosion conductive ceramic electrode material is prepared from artificial graphite, graphitized mesocarbon microbeads, a reinforcement binder, graphitized carbon fiber and E-44 epoxy resin. The preparation method comprises the following steps of adding a Ti4O7 functional additive having strong electrode performance, simultaneously adding one or several of ceramic anti-wear-corrosion components of TiB2, TiO2, TiC, B2O3, SiO2 and SiC, carrying out solidification, compression molding and high-temperature sintering after adding a mixing solvent and completely mixing the mixture, and finally preparing the anti-corrosion conductive ceramic electrode material. According to the anti-corrosion conductive ceramic electrode material and the preparation method, disclosed by the invention, aiming at an actual working situation of a sewage and sludge treatment environment, unique anti-corrosion components are added while low specific resistance of the anti-corrosion conductive ceramic electrode material is ensured, not only are wearing resistance and corrosion resistance of traditional ceramics obtained, but also excellent conductivity and excellent electrochemical performance are obtained, and the service life is up to more than 3500 hours.

A laser cladding or plasma transferred arc overlay welding process may be used advantageously to apply and to control the material properties of a coating designed for protecting the substrate against wear, corrosion and oxidation at elevated temperature. Furthermore, a laser cladding or plasma transferred arc overlay welding process may be used to apply the coating alloy materials in applications where traditional thermal spray or weld-applied coatings are not practical. By using these welding methods very good bonding is achieved by fusion during welding. At the same time the properties of the clad layer is preserved by the limited dilution typical of these two welding methods compared traditional overlay welding, by e.g. Gas Tungsten Arc Welding and the like.

The invention discloses a polyureas copolymer with a main chain containing siloxane composition units; the polyureas copolymer comprises the following constitution units: polysiloxanes constitutional units of aminoalkyl termination; polyether constitutional units of high-molecular amino termination; polyether alcohol or polyester alcohol constitutional units; single molecule chain extension double amine or low molecular amino termination polyether constitutional units; isocyanate constitutional units. Through the design of polysiloxanes molecular composition of aminoalkyl termination and adjustment of molecule mass; on one hand, a reaction amino group and an alkyloxy crosslinking group are introduced on a terminal group; on the other hand, a chain alkyl group or a perfluoro alkyl group are designed on a side chain; simultaneously three function hydroxy or amino groups are embedded in the composition, thereby obtaining excellent anti adhesiveness, abrasion resistance, corrosion resisting, impact resistance and anti contamination functions, effectively preventing contamination objects from pasting on special equipment, improving anti pollution function, solving adherence of adherence fluid, anti pollution and wearing corrosion problems, satisfying demands of different application fields, and prolonging service life of the special equipment.

The invention provides a ceramic polymer-material wear-resistant anticorrosion composite pipe and a manufacturing method thereof. The composition proportioned in portion by weight of the composite pipe is 10 to 50 portions of polymer material and 30 to 90 portions of ceramic particles. The polymer material and the ceramic particles are mixed well, heated to between 50 and 250 DEG C and prepared into the ceramic polymer-material wear-resistant anticorrosion composite pipe. The polymer material is a mixture of one or two types of anticorrosion plastics or rubber. The invention solves the deficiency that single-material and steel-plastic delivery pipelines in the prior art cannot meet the requirements of bearing certain pressure and wear and resisting strong corrosion. The invention has the advantages of utilizing the high hardness, good corrosion resistance and wear resistance of ceramics and the good corrosion resistance, good toughness and impact resistance of plastics or rubber to manufacture the pipelines with ceramic-plastic, ceramic-rubber and ceramic-rubber-plastic composite materials so as to ensure that the pipelines have good wear-corrosion resistance and good toughness andimpact resistance, thereby greatly reducing use cost and ensuring more extensive use.

The invention provides a method for preparing fine-grain Ti3Al / TiN gradient coatings on titanium and titanium alloy surfaces. The method includes the steps that under the nitrogen atmosphere, laser scanning processing, synchronous in-situ aluminum powder feeding and ultrasonic vibration treatment are simultaneously conducted on the titanium and titanium alloy surfaces of workpiece substrates, so that the fine-grain Ti3Al / TiN gradient coatings are prepared on the titanium and titanium alloy surfaces. The invention further provides a device for preparing the fine-grain Ti3Al / TiN gradient coatings on the titanium and titanium alloy surfaces. The method has the advantages that operation is easy and convenient, locating heating can be achieved, contact processing is avoided, a needed preparation time is short, and the depths of the Ti3Al / TiN gradient coatings are controllable. Compared with the prior art, the prepared fine-grain Ti3Al / TiN gradient coatings have the advantages of being free of air holes and cracks, having low surface roughness, achieving grain refinement, having high hardness and good wear-corrosion resistance, being reduced in surface residual stress and the like.

The invention provides a preparation method for a TiCN-Al2O3 ceramic composite coating. The method comprises the following steps that 1, a base body sample is subjected to surface roughening treatment; 2, Ti-C composite powder and Al2O3 powder are mechanically stirred and mixed to obtain spray feeding composite powder; 3, the surface of a base body is pre-sprayed with self-melting alloy powder ofNi-10%wtAl to obtain a bonding bottom layer with the thickness 90-120 [mu]m; and 4, the surface of the bonding bottom layer is sprayed with the spray feeding composite powder to obtain the TiCN-Al2O3composite coating with the thickness 300-500 [mu]m. The plasma-sprayed TiCN-Al2O3 ceramic composite coating has excellent performance of high hardness and abrasion and corrosion resistance, is suitable for workpieces under the abrasion and corrosion working environment such as the fields of manufacturing of cars and machinery such as cutters, drill bits and molds, aerospace industry and the like,and has extremely wide application prospects.

The invention relates to a stainless steel production method. The stainless steel comprises the following chemical components (wt.%): 0.01-0.03 of C, 0.05-0.1 of Si, 1-2 of Mi, 0.01-0.001 of S, 0.0015-0.015 of P, 30-35 of Cr, 3-4 of Mo, 0.2-0.8 of Cu, 0.1-0.01 of Le, and the balance Fe. The production method includes: vacuum smelting, electroslag refining, forging cogging, hot rolling molding, cold drawing, and heat treatment. The stainless steel welding material produced by the method has good pitting resistance, crevice corrosion resistance, cavitation and wear corrosion resistance in seawater medium and high fatigue strength.

The invention discloses a biphase alloy steel tank container seal head and a preparation technology thereof. The seal head is characterized in that the biphase alloy steel comprises the following components in percentage by mass: less than 0.030% of C, less than 1.00% of Si, less than 2.00% of Mn, 21.00-23.00% of Cr, 4.50-6.50% of Ni, 0.14-0.20% of N, 3.00-3.50% of Mo, less than 0.030% of P, less than 0.020% of S and the balance of Fe and inevitable impurities. The biphase alloy steel tank container seal head has the characteristics of good chloride stress corrosion resistance under low stress, good hole corrosion resistance, good corrosion fatigue resistance and erosion corrosion resistance, good comprehensive mechanical property, good weldability, small heat crack tendency and no preheating before the welding and thermal treatment after the welding, can be welded with heterogeneities such as austenitic stainless steel or carbon steel.

The invention relates to the technical field of harmless treatment of solid wastes, in particular to a phosphogypsum hardening agent as well as a preparation method and application thereof. The ardealite hardening agent provided by the invention is prepared from the following preparation raw materials in parts by weight: 1580 to 1780 parts of ardealite, 10 to 30 parts of a modifier, 100 to 130 parts of an active mineral admixture, 100 to 140 parts of cement, 15 to 40 parts of metakaolin, 10 to 35 parts of coal gangue slag, 5 to 10 parts of an early strength agent and 50 to 80 parts of water. The ardealite hardener can effectively enhance the early strength of ardealite, reduce the initial setting time and the final setting time of the hardened ardealite, improve the durability, the wear corrosion resistance and the erosion resistance of a material after ardealite hardening, and meanwhile, the material after ardealite hardening can meet the environmental quality standards of soil, surface water and underground water, and has a good application prospect. The problem that a large amount of ardealite is difficult to treat and utilize due to poor ardealite performance at present is solved.

The invention discloses a pipeline inner wall wear corrosion monitoring device and a monitoring method thereof. The pipeline inner wall wear corrosion monitoring device includes an annular wear corrosion sensor, an external pressure chamber and an electronic chamber, the annular wear corrosion sensor is placed in the external pressure chamber, and a potentiostat, a zero-resistance galvanometer, ahigh-precision digital voltmeter, a relay switch, a micro-resistance meter and a signal acquisition controller are placed in the electronic chamber; the sensor is connected to a pipeline through an end flange, an corrosion element and a temperature reference element are both connected to the micro-resistance meter, and the micro-resistance meter measures resistance of each partition, and the resistance is used for calculating the total metal loss rate of the inner wall of the pipeline; an electrode element, a potential reference element and the corrosion element form a three-electrode system,and the corrosion rate is obtained by measuring linear polarization of the corrosion element through the potentiometer and the zero-resistance galvanometer; and a difference between the total loss rate and the corrosion rate is the wear rate. The annular wear corrosion sensor can predict occurrence of wear corrosion in the pipeline, and evaluate the wear rate and corrosion rate of the pipeline inreal time.

The invention relates to a pressurized multistage heating high temperature erosion abrasion tester for simulating abrasion research of a coal burning boiler of a heat power plant, comprising a high temperature air-heating furnace, an abrasive grain feeder, a sample heating erosion machine, an erosion air feeding piping, after the erosion air feeding piping impenetrates the high temperature air-heating furnace, and directly passes over the sample heating erosion machine, an exit of the erosion air feeding piping points to the middle of a sample block vertically arranged in the sample heating erosion machine and forms a certain angle, an exit of the abrasive grain feeder is connected on the erosion air feeding piping between the high temperature air-heating furnace and the sample heating erosion machine. Provided is a pressurized multistage heating high temperature erosion abrasion tester for simulating erosion-corrosion operating conditions of the coal burning boiler of the heat power plant and validating spray coating performance of the boiler. Compared with the prior art, the invention has the advantages of good erosion abrasion simulating effect, short testing period, high testing efficiency and low testing cost.

The invention discloses a method for preparing a multiphase ceramic coating by in-situ reaction synthesis, characterized by: selecting a proper metal skin material to prepare cored wires, wherein a reactive drug core of self-propagating high-temperature synthesis (SHS) system is coated by the metal skin material; using electric arc spraying equipment to conduct self-reaction electric arc spraying, in the spraying process, igniting the highly exothermic SHS reaction by electric arc, rapidly generating a target ceramic phase while using arc energy and heat release of the SHS reaction to obtain a high temperature ceramic melt, and spreading the high temperature ceramic melt on the surface of a metal matrix by using high pressure atomizing gas, and using the characteristic of rapid solidification of the high temperature ceramic melt to obtain the high performance multiphase ceramic coating with a micro-nano crystal structure. The invention has the advantages of simple equipment, low cost and wide applicability, and can be applied for surface strengthening and protection of components which suffer wearing, corrosion and high temperature environment in military and civil industrial equipment.

The invention relates to low alloy wearing resistance corrosion resistance steel which is suitably used in the ocean mud-sand wearing and corrosive environment, which is produced by the following steps: Mn-Si-Cr-Mo system non-carbide bainite alloy steel is taken as research basis, the carbon content and other alloy element contents are properly adjusted, elements of Al, Nb and rare earth contributing to improving the corrosion resistance of the alloy steel are added for modification, and the Mn-Si-Cr-Mo-Al system non-carbide bainite steel is formed by the progression quenching heat treatment process, so that the low alloy wearing resistance corrosion resistance steel is obtained. The steel has good obdurability, wearing resistant and corrosion resistant comprehensive performance and welding repair performances, and can be used to solve the problem of repairing worn blades of a centrifugal pump of a ship, and can also be applied to other ocean wearing resistance welding parts.

The invention discloses a wear-corrosion-resistant polyurethane material comprising the raw materials: polytetrahydrofuran glycol, dimethyl-biphenyl diisocyanate, bis(hydroxymethyl)butyric acid, triisopropanolamine, hydroquinone bis(2-hydroxyethyl)ether, nano titanium dioxide, 3-isocyanate propyl triethoxy silane and stannous caprylate. A preparation process of the wear-corrosion-resistant polyurethane comprises the steps: taking dried polytetrahydrofuran glycol, heating up, adding a dimethyl-diphenyl diisocyanate solution drop by drop, carrying out heat preservation stirring, heating up, adding a bis(hydroxymethyl)butyric acid solution drop by drop, carrying out heat preservation stirring, cooling, adding a triisopropanolamine solution and a hydroquinone bis(2-hydroxyethyl)ether solution drop by drop, carrying out heat preservation stirring, and purifying to obtain an intermediate material; introducing nitrogen gas, taking an intermediate material solution, adding stannous octoate, heating up, adding a modified nano titanium dioxide solution drop by drop, carrying out heat preservation stirring, and purifying to obtain the wear-corrosion-resistant polyurethane material. The wear-corrosion-resistant polyurethane material has the advantages of good wear resistance, good corrosion resistance and high mechanical properties.

The invention discloses a biodegradable alkyl acetamidobenzotriazole derivative lubricating oil additive which does not contain sulfur, phosphorus, halogens and metal elements as well as a preparation method and application thereof. The preparation method comprises the following steps: under the action of alkali, performing amidation on alkyl amine and chloroacetyl chloride to obtain alkyl chloroacetamide; and then performing a nucleophilic substitution reaction with benzotriazole to obtain a target compound of a formula I. The preparation method disclosed by the invention is simple in preparation method, mild in process condition, easily available in raw material, low in preparation cost and high in synthetic yield. The novel alkyl acetamidobenzotriazole derivative can be independently used as an extreme pressure anti-wear corrosion-resistant additive of lubricating oil, also can be used with other lubricating oil additives in a compound manner, also can be used in common working conditions and high-temperature working conditions, can improve the bearing capacity of basic oil obviously and improve the anti-wear performance, and is the lubricating oil additive which is environmentally friendly and multi-functional. The formula I is as shown in the specification.

The invention discloses a 600HB hardness wear-corrosion-resistant steel plate used for slurry dredging pipes, and a production method thereof. The 600HB hardness wear-corrosion-resistant steel platecomprises, by weight, 0.36 to 0.42% of C, Si<=0.01%, 1.6 to 2.0% of Mn, P<=0.015%, S<=0.005%, 0.2 to 1.0% of Al, 0.3 to 1.2% of Cr, 0.001 to 0.002% of B, N<=0.005%, one element or two elements selected from 0.01 to 0.03% of Nb or 0.01 to 0.025% of Ti, and the balance Fe and unavoidable impurities, wherein 6.65N<Nb+Ti<=0.045. Both the wear resistance and the corrosion resistance are taken into consideration in preparation; the 600HB hardness wear-corrosion-resistant steel plate possesses excellent wear resistance, and is mainly used for preparation of dredging pipes used in reclamation projectand navigation channel dredging; the corrosion resistance degree is 5 times of that of common pipes, so that dredging efficiency is increased greatly, and operation cost is reduced.

The invention belongs to the technical field of corrugated pipes, and particularly relates to an anti-corrosion corrugated pipe for natural gas conveying. Joints are connected to the positions, located at the two ends of a long pipe, of the outer surface of the long pipe in a sleeving manner. The long pipe comprises an elastic hose. The elastic hose is made of an anti-corrosion material. Evenly-arranged arc blocks are fixedly connected to the outer surface of the elastic hose and are attached to one another to form a round pipe. A first sliding groove is formed in the end face of one side of each arc block. A first sliding block is fixedly connected to the end face of the other side of each arc block, and the first sliding blocks are arranged in the first sliding grooves and are in slidingconnection with the first sliding grooves. The anti-corrosion corrugated pipe is mainly used for solving the problems that in existing corrugated pipes, structures are single, most corrugated pipes adopt single-layer corrugated pipe structures, the defects of poor anti-corrosion performance, poor anti-pressure ability, easy wear and the like exist in the corrugated pipes of this kind, during use,cracks or wear or corrosion is prone to being generated, damage is prone to being caused, and consequently the service life is shortened.

The invention discloses a hybridized aramid silicone aerogel modified flame-retardant polypropylene foaming plate and a preparation method thereof. A hybridized aramid silicone aerogel filler in foaming materials is obtained by mixing an aramid pulp solution with a silica sol system, an aerogel compound with a porous network structure and high in toughness, heat resistance and flame retardant is finally obtained. Melt strength can be effectively increased by adding the aerogel compound into a resin system, effects of reinforcement, flame retardance, nucleation and the like are achieved, usage amount of a traditional flame retardant is reduced, porosity of the system can be effectively increased, resin foaming is facilitated, traditional flame retardant materials of molybdenum disulfide, diethyl phosphonate aluminum and the like are combined, and the lightweight polypropylene foaming composite material with good flame-retardant effect is finally prepared; the composite material is even in porosity, crush and heat resistant, resistant to wear corrosion, economic and durable and quite promising in application.