steel tube

    The solution treatment has three points.     1. Make the structure and composition of the steel pipe uniform, which is especially important for the raw materials, because the rolling temperature and cooling rate of each section of the hot-rolled wire are different, resulting in an inconsistent organizational structure.     2. Eliminate work hardening in order to facilitate continued cold work.     Through the solution treatment, the twisted lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel pipe decreases, and the elongation increases.     3. Restore the inherent corrosion resistance of stainless steel.     The precipitation of carbides and lattice defects due to cold working reduce the corrosion resistance of stainless steel. After solution treatment, the corrosion resistance of the steel pipe is restored to its original st...

    The casing is a steel pipe that supports the walls of oil and gas wells. Each well will use several layers of casing according to different drilling depths and geological conditions. Cement is used to cement the casing after it goes down the well. It is different from tubing and drill pipe and cannot be reused. It is a disposable material. Therefore, the casing consumption accounts for more than 70% of all oil well pipes. The casing pipe can be divided into: casing, surface casing, technical casing and oil layer casing according to the usage.     1. Guide bush     It is mainly used for drilling in oceans and deserts to separate seawater and sand to ensure smooth drilling.     2. Surface casing     It is mainly used for the first drilling, drilling the soft ground layer to the bedrock, in order to seal this part of the formation from collapse, it needs to be sealed with surface casing.     3. Technical casing ...

    The difference between normalizing, tempering, annealing and quenching lies in different processes, different changes in material structure, and different results of changes in material properties.     1. The process is different:     Normalizing is to heat the workpiece to Ac3 (Ac refers to the final temperature at which all free ferrite transforms to austenite during heating, generally from 727 ° C to 912 ° C) or Acm (Acm is the critical temperature line for complete austenitizing of eutectoid steel during actual heating) 30 ~ 50 ℃, after holding for a period of time, take out the metal that is cooled in the air or sprayed with water, sprayed or blown from the furnace Heat treatment process.     Tempering treatment means that the steel after quenching hardening or normalization treatment is cooled down at a certain rate after being immersed for a period of time below the critical temperature.     Annealing is a metal heat t...

    There are two main types of pipeline corrosion: internal corrosion and external corrosion.     External corrosion is mainly due to the corrosion caused by the connection of the pipeline material with the external environment such as soil, seawater, atmosphere and other corrosive media. At the same time, because some pipelines have an insulation layer outside, moisture may be caused under the insulation layer due to other factors Accumulation (sometimes because of the high temperature of the medium in the pipe causes the external moisture to heat up) causes highly corrosive corrosion areas that cause corrosion under the insulation layer of the pipeline.     Internal corrosion is different depending on the nature of the fluid in the pipeline. Including acidic corrosion, corrosion caused by chloride ions, microbial corrosion, stress corrosion, welding corrosion, etc.

    If this elbow is not required for layout (it may touch equipment, limited height or other pipelines), it is generally used for pipeline layout. This mechanism is presented in civil heating pipes, power plant steam pipes, and heat pipes in steel chemical plants.     This is achieved by the material of the pipe itself and its installation requirements.     On the one hand, the pipeline is divided into two states: working state and cold state. One is high in temperature and the other is approximately equal to the ambient temperature. The metal material has better thermal expansion and contraction characteristics. .     On the other hand, to ensure a certain stability of the pipeline, it is necessary to have a bracket and push it up. One of them is a so-called fixed bracket.     Steam pipes should use natural compensation (that is, only expansion bends without expansion joints) to eliminate the stress caused by pipeline expansion...

    1. Meet health requirements     The thin-walled stainless steel water pipe will not cause secondary pollution to the water quality and meet the requirements of national direct drinking water quality standards.     2. Can be 100% recycled     Thin wall stainless steel water pipe is a kind of water pipe that can be completely recycled. It does not leave people with unmanageable trash.     3. Save water     The strength of thin-walled stainless steel water pipe material is higher than that of all water pipe materials, which greatly reduces the possibility of water pipes leaking due to external forces and saves a lot of water resources.     4. Reduce transportation costs     The thin-walled stainless steel water pipe has excellent corrosion resistance, and will not scale during long-term use. The inner wall is smooth and clean, the energy consumption for transportation is low, and the cost is s...

    Spiral steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction. It is one of the twenty key products developed.     For liquid transportation: water supply and drainage.     For gas transportation: coal gas, steam, liquefied petroleum gas.     For structural use: for piling pipes and bridges; for docks, roads, and building structures.     Main technical characteristics of spiral steel pipe:     1. During the forming process, the steel plate deforms uniformly, the residual stress is small, and the surface is not scratched. The processed spiral steel pipe has more flexibility in the range of diameter and wall thickness. Especially in the production of small and medium-diameter thick-walled pipes, it has advantages that are unmatched by other processes, and can meet the user's more requirements on spiral steel pipe spe...

    1. After the pipe is inserted into the pipe, it can be pressed with a special clamping tool and the connection can be completed in an instant. The complicated threading operation during thread connection is not required, and the pre-processing and post-processing operations during welding are not needed, and the comprehensive cost of pipeline construction is greatly reduced.     2. Compression type pipe fitting series products use special compression tools. As long as attention is paid to construction essentials, anyone can operate and ensure uniform quality.     3. No cutting fluid or other accessories for thread connection are needed, nor a series of fluxes for welding connection. Therefore, it is not necessary to consider the various effects brought about by these additives.     4. No fire source is used at the pipeline construction site, and the construction safety performance is greatly improved.     5. Because the stain...