steel tube

    Nowadays, high-frequency straight seam welded pipes ( ERW pipe ) are mainly used in water supply engineering, power industry and petrochemical industry, etc. There are many types of water pipes used in our lives, of which high-frequency straight seam welded pipes are commonly used, so when What should we do when the high frequency straight seam welded pipe is blocked? Next, the high frequency straight seam welded pipe manufacturer will come to understand with you:     1. It can be washed with water. This method is very simple. It is to use the pressure of water to flush all the blocked materials away.     2. You can also use machinery for flushing. This method is to use mechanical devices to generate high-pressure jets to flush the pipeline, so as to loosen the sediment in the upstream pipeline, so that the dirty things can be washed away.     3. Manual, this requires us to manually use the corresponding tools to get all the obstructions...

    Tubing naturally has a smaller diameter than casing pipe , except for the 4 1/2-inch diameter. An outer diameter of 114.3 mm (4 1/2 inches) is considered a threshold and can be either casing or tubing. Anything smaller is called tubing, anything larger is casing.

    Straight seam steel pipe is a steel pipe with welds parallel to the longitudinal direction of the steel pipe. It is usually divided into metric welded steel pipes, welded thin-walled pipes, transformer cooling oil pipes and so on. The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produced from narrower billets. Welded pipes with different diameters can also be produced with billets of the same width. However, compared with straight seam pipes of the same length, the weld seam length is increased by 30 to 100%, and the production speed is lower. Straight seam steel pipe can be divided into high frequency straight seam steel pipe and submerged arc welded seam steel pipe according to the production process. Submerged arc welded straight seam steel...

    Oil casing pipe in-plant inspection: defect handling     Various defects found in the pipe body or pipe end that affect the performance of the pipe, such as pits, cracks, folds, bumps, bumps, gouges, delaminations, hairlines, etc., if the depth of the defects does not exceed the entire pipe 10% of the wall thickness can be removed by manual grinding, and the smooth transition between the ground and the pipe can be achieved.     During the inspection, if the depth of the pipe body defect is found to exceed 10% of the wall thickness of the whole pipe body, the root pipe shall be judged as unqualified; if such an over-standard defect is found at the pipe end, it shall be marked and mechanically removed.

    transit time, market time and deflection time, and the dynamic fracture toughness experiments on an oscillometric impact testing machine. Petroleum casing manufacturers believe that it is feasible to calculate the dynamic L using the static flat method, that is, how to deal with the problems of inertial force shadow noise and vibration and dynamic deformation.     The loading rate and strain rate of static or quasi-static loads are relatively low, without taking into account the effects of fracture and deformation of the nature of the material on the fracture process brought by the elastic phase transition at high load rates and deformation, and the stress is The response speed of the strain sound is lower than the sound speed of the data, and has no effect on the deformation rate of the elastic deformation performance of the data.     But in the stage of plastic deformation, the process of plastic deformation is relatively slow. Petroleum casing ma...

    JCOE steel pipe manufacturing technology is developed a kind of welded pipe forming technology in the 1990s, the process of the molding is to first plate edge milling ( or plane ) after longitudinal edge bending, then press J→C→O sequence forming, each step stamping with three points bending theory.     As is the multi-pass progressive pressing, so following problems must solve: how to determine the shape of the mold, mold and die stroke spacing, and the need how many times can guarantee the stamping the most appropriate bending radius and the best opening gross of round billet. And these problems with different steel materials, steel production plant specific mechanical properties, steel pipe specifications ( diameter and wall thickness ), which is very complex.     At present, mainly by " trial and error", which replaced whenever the new standards or new steel grades, get a certain number of samples tested, working out a suitable stamping volume. ...

    LSAW pipe production process is simple, high production efficiency, many varieties of different specifications and the general strength of less than seamless pipe. Then the main difference between the straight seam steel pipe and seamless pipe is production technology as well as the application.     lsaw pipe is iron by bending and healing up with welding and other processes of production,which allows a weld. Seamless pipe is round steel pipe by rolling mill hot-rolled without welding.     Seamless and straight-seam pipe in the case of equal diameter and wall thickness, and seamless pipe by the pressure and the strength is far greater than the straight-seam pipe. General pressure on the choice of engineering pipe seamless pipe, there is no pressure or low pressure works allowed on the choice of the relatively low cost straight seam pipe.     http://www.xysteelpipe.com/info/Difference-between-lsaw-pipe-and-seamless-pipe-1615-1.htm

    1.Tubing classification     Tubing can be divided into the tubing (NU), upset tubing (EU) and the overall joint tubing. Flat means the oil casing pipe end without directly threading thicker and bring couplings. Upset tubing means after two pipe ends through external upset, then threading and bring couplings. Overall joint tubing means through internal upset end car thread the other end through the car outside the thick thread, with no direct connection couplings.     2.Tubing role     ① extracting oil and gas: oil and gas well cementing kick and then placed in the oil casing pipe to extract the oil and gas to the surface.     ② water: When the downhole pressure is not enough, through the tubing into the well water.     ③ steam injection: in heavy oil thermal recovery process, the use of insulated tubing downhole steam input.     ④ acidizing and fracturing: Late in drilling oil and gas wells or in order...

    Spheroidizing annealing is a heat treatment process for spheroidizing carbides in steel to obtain granular pearlite.     Process: Heating to 20 ~ 30 ℃ above Ac1, the holding time should not be too long, generally 2 ~ 4h is suitable, and the cooling method is usually furnace cooling, or a long time isothermal at about 20 ℃ below Ar1.     It is mainly used for eutectoid steel and hypereutectoid steel, such as carbon tool steel, alloy tool steel, bearing steel, etc. The microstructure of hypereutectoid steel after rolling and forging is lamellar pearlite and reticulated cementite. This structure is hard and brittle, not only difficult to cut, but also easy to deform and crack in the subsequent quenching process. . Spheroidized annealing results in spherical pearlite. In spherical pearlite, fine cementite particles are spherical and dispersed on the ferrite substrate. Compared with lamellar pearlite, spherical pearlite is not only harder and easier to c...

    Common methods of pipe fitting processing     1.Forging method: The end or part of the pipe is extruded with a forging machine to reduce the outer diameter. Common forging machines are rotary, link and roller.     2.Stamping method: Use a tapered core to expand the pipe end to the required size and shape on the punch.     3.Roller method: The core is placed in the tube, and the periphery is pressed by rollers for round edge processing.     4.Rolling method: Generally, no mandrel is used, which is suitable for the inner round edge of thick-walled pipes.     5.Bending forming method: There are three methods more commonly used, one method is called stretching method, the other method is called stamping method, and the third roller method has 3-4 rollers,two fixed rollers, one adjustment roller, adjustment With fixed roller pitch,the finished pipe is bent.     6.Bulging method: one is to place rubber in th...