32results about How to "Improved resistance to stress corrosion cracking" patented technology

The invention discloses a corrosion resistant and squeezing highly resistant oil casing pipe and a preparation method thereof. The oil casing pipe comprises, by weight percentage, 0.22%<=C<=0.30%, 0.15%<=Si<=0.35%, 0.40%<=Mn<=0.60%, S<=0.003%, P<=0.01%, 0.02%<=Al<=0.04%, 0.75%<=Cr<=1.20%, 0.25%<=Mo<=0.55%, Ca<=0.0025%, N<=0.08% and the balanced Fe and unavoidable impurities. The oil casing has theadvantages that the squeezing resistant strength of the prepared oil casing pipe is 30% or above higher than the squeezing resistant strength required by API 5C3 standards, the hydrogen sulfide corrosion resistance performance is conformed to demands in API 5CT (45 edition) PSL3, and the oil casing pipe can be extensively applied to the exploitation of oil and gas wells of acid medium deep wells, ultra-deep wells and the like with complicated geological conditions

The invention discloses a multi-combination degenerative low-zinc hot-dipped aluminum alloy coating material. The alloy comprises the following components: by weight, smaller than or equal to 15% of zinc (Zn), 0.5%-2.5% of silicon (Si), 3% of alloy enhancer copper (Cu), 0.5% of polarization alterant gold (Au), 0.5% of solvent passivator chrome (Cr), 0.3% of sediment hardening agent cadmium (Cd), 0.5% of grain refiner titanium (Ti), 0.5% of rare earth addition cerium (Ce), 1% of matrix interfacial reaction buffering agent, with the balance being aluminum (Al) and inevitable trace impurities. The Multi-combination degenerative low-zinc hot-dipped aluminum alloy coating material effectively solves the problem that the proportion of the hot-dip galvanizing occupying the zinc is high, and the zinc resource is saved. A great quantity of the aluminum is added to replace the zinc in the aluminum alloy coating material for hot dipping, due to the fact that the aluminum resource is rich and the cost is low, the comprehensive cost of the coating material is reduced.

The invention relates to a shot peening system for an inner wall of a steel cylinder, which comprises a compressed air source, a sand-blasting tank, a recovery bucket elevator, a recovery bucket, a driving device, a dedusting hood, the steel cylinder, a sand-blasting gun, a sand-blasting processing device, a deduster, a fan and a chimney, wherein the compressed air source is used for feeding blasting shots in the connected sand-blasting tank into the sand-blasting gun of the sand-blasting processing device through a sand-blasting valve of the sand-blasting tank; the sand-blasting gun is coaxially placed in the steel cylinder; the steel cylinder is connected with the recovery bucket; the recovery bucket is connected with the recovery bucket elevator; the recovery bucket elevator is connected with the sand-blasting tank; the sand-blasting gun is driven by the sand-blasting processing device to displace axially; and gas in the steel cylinder is collected by the dedusting hood so as to be fed into the deduster and is discharged by the fan through the chimney. According to the shot peening system, compressed air is adopted as driving force, and sand blasting is accelerated to generate a certain kinetic energy which is sprayed to the inner wall of the steel cylinder, so that scales (iron rust) on the inner wall of the steel cylinder, turning residues and attachments generated by stretching in the inner wall of the steel cylinder are cleaned; a bright and clean metal surface is obtained through processing; and the smooth finish reaches sa2.0-2.5(GB8923-88).

The invention provides aluminium bronze of a sand-casting high-pressure pump head, belonging to the technical field of new non-ferrous materials. The aluminium bronze comprises 9-11.5 % of Al, 2.5-5.0 % of Fe, less than or equal to 3.5 % of Mn, 3.0-6.0 % of Ni, 0.05-0.2 % of Sn, 0.01-0.5 % of Cr, 0.5-1.0 % of Zn, 0.015-0.2 %, and the balance being Cu and less than 1 % of usual impurities. The alloy is high in mechanical properties and pressure resistance of castings, and can be used in related fields of high-voltage submersible pump heads.

The invention relates to an ultralow-carbon high-temperature-resistant welding wire and a preparation method thereof. The ultralow-carbon high-temperature-resistant welding wire comprises the following chemical components, in percentage by mass, of 0.01%-0.04% of C, 22.0%-24.0% of Cr, 1.5%-3.5% of Si, 12.0%-14.0% of Ni, 0.5%-1.2% of Ti, 0.1%-0.4% of Mn, 0.2%-0.5% of Zr, 0.3%-0.6% of Sc, 0.1%-0.3%of Mo, 0.3%-0.5% of Nb, 3.0%-5.0% of Mg, 0.6%-1.2% of Al, 0.03%-0.07% of P, 0.02%-0.05% of S, 0.2%-0.4% of V, 1.3%-1.6% of B, and the balance Fe and other inevitable impurity elements. According to the method, the mechanical property of the welding wire can be improved while the low carbon of the welding wire is ensured.

The invention discloses low-zinc hot-dip-coating aluminum alloy coating material achieving alteration by chrome coordination compound. The low-zinc hot-dip-coating aluminum alloy coating material achieving the alteration by chrome coordination compound comprises, by weight, 3.25% of chrome coordination compound Cr (CO) 6, 30% of Zn, 1.0% of Si, 0.7% of tombarthite additives, and balanced Al and unavoidable trace impurities. The low-zinc hot-dip-coating aluminum alloy coating material achieving the alteration by chrome coordination compound solves the problems that steel plate needle-shaped coating leakage can occur to zinc-aluminum coating material and a coating layer can not effectively protect cathodes of a scratch and a notch and also achieves the performances, such as forming machining, welding and coating, of the zinc-aluminum coating material.

The invention relates to a steel core wire anticorrosive alloy coating for an overhead conductor and a preparation method of the steel core wire anticorrosive alloy coating. The steel core wire anticorrosive alloy coating comprises, by weight, 5-10% of aluminium, 0.005-0.2% of rare earth, 0.005-0.2% of silver, 0.05-0.5% of manganese, 0.05-1.0% of chromium and the balance of zinc and inevitable impurities. Alloy coatings prepared according to the proportion of the steel core wire anticorrosive alloy coating are excellent in corrosion resistance, namely, taking the occurrence time of yellow rustas the failure standard of the alloy coatings, under the condition that the thicknesses of the coatings are the same, the corrosion resistance of the steel core wire anticorrosive alloy coating is 15times higher than that of a hot-dip pure zinc coating; and taking weight loss in a salt spray test as the standard of testing the corrosion resistance of the alloy coatings, under the condition thatthe thicknesses of the coatings are the same, the corrosion resistance of steel core wire anticorrosive alloy coating is 15 times higher than that of an industrial hot-dip pure zinc coating.

The invention relates to a corrosion-resisting prestress pipeline steel wire. The corrosion-resisting prestress pipeline steel wire is invented for mainly solving the problem that a current pipeline steel wire is broken due to stress corrosion cracking. The steel wire comprises metal elements including, by total weight percent, 0.15%-0.50% of Cr, 0.05%-0.10% of V, 0.10%-1.00% of Ni, 0.10%-0.50% of Cu, 0.79%-0.83% of C, 0.12%-0.32% of Si, 0.60%-0.90% of Mn, smaller than or equal to 0.025% of S, smaller than or equal to 0.025% of P and the balance Fe. The steel wire production technology is the same as the existing SWRH82B steel wire production technology. The corrosion-resisting prestress pipeline steel wire has the beneficial effect that the corrosion resisting capability of the steel wire is improved.

The invention discloses a corrosion prevention method of a rare earth-containing alloy coating used for ground net protection, and relates to the conductive coating corrosion prevention field, according to the method, plasma spraying technology is used, carbon steel is used as a ground net material, and the ground net surface is successively sprayed with a cohesive bottom layer with the thickness of 60-100 microns and a lanthanum, cerium, praseodymium, neodymium and other rare earth-containing functional alloy surface layer with the thickness of 150-200 microns. The method comprises the following steps: (1) purification decontamination and sandblasting processing of the ground net surface; (2) allocation of lanthanum, cerium, praseodymium, neodymium and other rare earth-containing alloy powder in zinc, aluminum, magnesium, nickel, manganese, silicon, chromium, beryllium and titanium alloy powder of a surface layer coating; and (3) formation of the rare earth-containing alloy corrosion prevention coating. The electric power ground net surface is sprayed with the rare earth-containing alloy corrosion prevention coating, so that the ground net service life is improved, the ground net work cost is reduced, and the method is simple and reliable in process, green, low-carbon, non-pollution, and friendly to environment.

The invention discloses a heat treatment method for pre-aging, re-solid-solution and re-aging of an Al-Cu-Li alloy, belongs to the field of material heat treatment, and aims to perform conventional solid-solution, pre-aging, re-solid-solution and re-aging treatment on an Al-Cu-Li alloy extruded plate by controlling a heat treatment process system and parameters thereof. The conventional solid solution and re-solid solution treatment temperature is 515 +/-10 DEG C, heat preservation is performed for 60-90 min, then water quenching is performed, and the quenching transfer time is shorter than 5s. The pre-aging and re-aging treatment temperature is 160-180 DEG C, heat preservation is performed for 24-48 hours, and the product is taken out for air-cooling. The strength of the alloy can be reduced through re-solid-solution treatment, the plasticity of the alloy is improved, and correction and reprocessing processes are facilitated. The re-aging treatment can effectively regulate and control the variety, density and distribution of precipitated phases, thereby enhancing the strength of the alloy. In addition, due to coarsening of discontinuous grain boundary precipitated phases in the alloy and increasing of the copper content, on the premise that the strength of the alloy is basically not lost, the stress corrosion resistance, the intergranular corrosion resistance and the electrochemical corrosion resistance are improved, and the plasticity of the alloy is improved. The process is simple and feasible and is not limited by the thickness of the plate.

The invention discloses a metal additive manufacturing device and method based on high-speed shot peening. The metal additive manufacturing device includes peening shot, a shot peening adjustment mechanism, a recycling material box, a forming box, a material storage box, a metal powder preheater, an X-Y scanning mirror, a controller and a continuous laser. According to the metal additive manufacturing device, SLS or DMLS and a shot peening technology are comprehensively used, by precisely controlling continuous laser parameters (including continuous laser spot shape, continuous laser scanningspeed and the like), nozzle diameter, nozzle distance, coverage rate, shot peening speed, quality flow rate, shot peening time and action areas, the surfaces of parts are impacted within a certain period of time, so that the surface structure is refined, residual compressive stress is introduced, and a surface structure is optimized, so that the surface strength and hardness, fatigue-resistance performance, stress-resistance corrosion cracking and high-temperature-oxidation resistance of a metal material can be significantly improved.

The invention discloses a Re modified low-zinc hot-dipped aluminum alloy coating material. On basis of weight percentage of elements, the alloy comprises 20-25% of Zn, 0.03-0.05% of Sr, 1.5%-2.0% of Mg, 0.1%-0.2% of Cr, 0.05%-0.08% of Cd, 0.4%-0.5% of Si, and the balance being Al and inevitable trace impurities; and a modifier Re2 (CO)10 accounts for 0.001%-0.01% of the total amount of furnace charging materials. In the coating material provided by the invention, the amount of Al that substitutes Zn is greatly improved, thereby reducing dependence on Zn resources.

The invention discloses a method for manufacturing a bacterial corrosion resistant X65 high efficiency welded pipe (HFW). The method sequentially includes the steps of unwinding butt welding, edge planing, molding, gas shielded high-frequency induction electric resistance welding, welded joint normalizing heat treatment, full pipe body aging heat treatment, sizing flying shear, straightening, ultrasonic inspection, X-ray inspection, water pressing, pipe end chamfering and finished product inspection. Small extrusion amount and small opening angle processes are adopted during forming, after aging heat treatment is combined, the welded pipe has small residual stress, the circumferential opening amount of the pipe body is only measured by a slit-ring method as -20mm - 0mm, low stress and negative value residual stress forming is realized, and the occurrence of sulfide stress corrosion cracking (SSCC) and other corrosion cracking situations of the pipe under the stress action can be prevented. After normalizing heat treatment, the pipe body is subjected to aging heat treatment, so that solid-soluble Cu in the pipe body and a welded joint diffusely precipitates a nanometer Cu-rich phase, and the nanometer Cu-rich phase is the key to improve the antimicrobial corrosion resistance of the welded pipe.

The alloy powder capable of producing compression stress in the fused-on layer consists of Cr 6.0-12.0 wt%, Ni 5.0-11.0 wt%, Mn 0.5-1.8 wt%, Mo 0.1-0.9 wt%, Nb 0.1- 0.9 wt%, Ti 0.1-0.9 wt%, Si 0.1-0.9 wt%, except Fe. It has grain size of 50-200 microns, solid phase change temperature after melting and solidifying of 100-300 deg.c, and structure comprising martensite in 50-90 % and austenite in 10-50 %. The present invention is used in raising the fatigue resistance, stress corrosion resistance, safety and service life of iron and steel material, mechanical structure and equipment. The method and material of the present invention may be used in producing composite material product with compression stress in the surface.