40results about How to "Improve service safety" patented technology

The invention discloses a reinforcing thermal treatment technology for the pipe end of a petroleum steel pipe in a quenching and tempering condition. The technology comprises the following steps of: S1, performing the first-stage quenching and tempering treatment on the whole pipe; and S2, performing secondary tempering treatment on the middle part of the pipe body of the steel pipe obtained by the step S1. The secondary tempering treatment on the middle part of the pipe body of the steel pipe aims at reducing the strength of the middle part of the steel pipe and realizing the strength performance of a final product. The technology disclosed by the invention can realize strength mismatching between the pipe body and the pipe end of a petroleum steel pipe in a quenching and tempering condition, so that no obvious transition area exists between the pipe body and the pipe end of the steel pipe. According to the reinforcing thermal treatment technology for the pipe end of a petroleum steel pipe in a quenching and tempering condition, disclosed by the invention, the strength of the treated petroleum steel pipe is distributed in a mismatching manner, the weak point of easy deformation and even breakage caused by stress concentration of a threaded structure at the pipe end of an existing product can be eliminated, and the service safety of the steel pipe can be improved.

The invention belongs to the technical field of material experiments, in particular relates to a high-temperature and high-pressure circulating water constant-load extension experimental device with an in-situ acoustic emission testing function and aims to solve the problems of stress corrosion test under the high-temperature and high-pressure water environment conditions and transferring and acquisition of an acoustic emission signal in the high-temperature and high-pressure water environment. The device comprises a high-temperature and high-pressure circulating water system, a constant-loadloading device, a control system and an acoustic emission signal acoustic emission monitoring system, wherein the high-temperature and high-pressure circulating water system provides a dynamic high-temperature and high-pressure water environment; the constant-load loading device performs constant-load extension on a sample in a high-pressure autoclave; the control system controls the high-temperature and high-pressure circulating water system; and the acoustic emission signal acoustic emission monitoring system is used for monitoring the sample in the high-pressure autoclave in an on-line mode. The device is simple in structure, convenient to use and maintain, can better meet experimental requirements, and provides important significance for development of the stress corrosion research ofa nuclear power material in the high-temperature and high-pressure water environment and improvement of the service security, reliability and economical efficiency of the key equipment of nuclear power plants in China.

The invention discloses an air-cooling type 80H thermal production well casing based on a strain design and production process thereof. The material of the air-cooling type 80H thermal production well casing comprises the following chemical constituents in percentage by mass: 0.20-0.22% of C, 1.0-1.25% of Mn, 0.40-0.50% of Si, less than 0.011% of P, less than 0.004% of S, 0.90-1.0% of Cr, 0.20-0.25% of Mo, 0.03-0.04% of Ni, 0.01-0.02% of Nb, 0.01-0.02% of Al, 0.001-0.0015% of B, and the balance of matrix element iron. The invention further discloses the production process for the casing. The production process comprises the following steps of: heat treatment and cooling. The resistance of the casing to high-temperature permanent deformation can be improved, and casing damages can be reduced, and then the safe reliability of the thermal production well casing during a service process can be improved.

The invention discloses a strength mismatching heat treatment process for a petroleum steel tube in a hardened and tempered state, belonging to the technical field of metal engineering materials. The process comprises first-stage whole tube hardening and tempering and second-stage tube end hardening and tempering. According to the process, the strength mismatching of the tube body and the tube ends of the petroleum steel tube in a hardened and tempered state can be realized, the strength and toughness of the tube ends are higher than those of the tube body, and the strength and toughness of transition zones between the tube ends and the tube body are higher than those of the tube body but lower than those of the tube ends, thus ensuring that the steel tube has the performance distribution of strength mismatching accompanied with the distribution of toughness mismatching. The distribution of strength mismatching eliminates the weak point that the tube ends of the existing product are prone to deform or even break due to stress concentration caused by thread structures, and improves the service safety of the steel tube.

The invention discloses wet-mixed thermal mortar doped with phosphorus slag and free of shrinkage. The wet-mixed thermal mortar is mainly prepared from cement, the phosphorus slag, fly ash, slaked lime, a composite admixture, lightweight aggregates, fibers and mixing water, wherein the composite admixture mainly comprises components as follows: an etherified polycarboxylate superplasticizer, hydroxyalkyl cellulose ether, dispersible latex powder, polyacrylamide, sodium dodecyl benzene sulfonate, sodium gluconate and etidronic acid. The wet-mixed thermal mortar effectively reduces construction intensity and has the characteristics that the construction operation time is superlong and controllable, the thermal mortar avoids air shrinkage and the like, furthermore, the wet-mixed thermal mortar is stable in performance in operable time of the construction, and the construction quality is excellent.

The invention belongs to the field of steel material preparation, and particularly relates to a low-yield-ratio marine steel plate with good welding performance and a manufacturing method thereof. Thelow-yield-ratio marine steel plate comprises the following components of, by weight, 0.05%-0.09% of C, 0.1%-0.4% of Si, 1.0%-1.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.02%of S, 0.005%-0.03% of Als, 0%-0.6% of Ni, 0%-0.3% of Cu, 0.008%-0.05% of Nb, 0.005%-0.03% of Ti, 0.002%-0.01% of N, 0.02%-0.08% of V, 0%-0.3% of Mo, and the balance Fe and inevitable impurities, wherein the yield ratio of the steel plate is less than or equal to 0.80, the carbon equivalent Ceq is less than or equal to 0.41, and Pcm is less than or equal to 0.21. According to the low-yield-ratio marine steel plate with the good welding performance and the manufacturing method thereof, a certain content of N element is added, and second phase dispersion precipitation of V, Ti element is matched,so that the high-heat input welding performance and the low-temperature impact toughness of the steel plate are improved; and chemical components and the processes of high finish rolling temperature,low water inlet high red returning temperature and low cooling speed are combined, so that the high service safety with the yield ratio being less than or equal to 0.8 can be obtained, and a corresponding production process is formed while the high-service safety steel plate which is easy to weld with high heat input is obtained.