ERW Steel Pipe

　　How to distinguish poor quality seamless steel tubes 　　1. Fake steel tubes are prone to folding. 　　Folding is various fold lines formed on the surface of steel pipes. This kind of defect often runs through the entire longitudinal direction of the product. The reason for the folding is that the fake and shoddy manufacturers are pursuing high efficiency, the reduction is too large, and ears are generated. When the next rolling is performed, folding occurs. The folded product will crack after bending, and the strength of the steel is greatly reduced. 　　2. The appearance of fake and inferior steel pipes is often pitted. 　　The ramie surface is a defect of irregular unevenness on the surface of the steel due to the serious groove wear. Because the manufacturers of fake and inferior steel pipes are pursuing profits, they often appear to be rolling the most. 　　3. The surface of fake and inferior steel pipes is easy to produce scars. 　　There are two reasons for this: (1). The ...

　　Surface cleaning method for seamless steel pipe 　　1. cleaning 　　Solvents and emulsions are used to clean the surface of steel to remove oil, grease, dust, lubricants and similar organic matter, but it cannot remove rust, scale (corrosion products formed by oxidation), welding flux, etc. on the surface of steel, so Used only as an aid in antiseptic production. 　　2. tool derusting 　　The surface of steel is mainly polished with tools such as wire brushes, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of manual tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is firmly adhered to the iron oxide scale, the rust removal effect of the tool is not ideal, and it cannot reach the depth of anchor pattern required for anticorrosion construction. 　　3. Pickling 　　Generally, chemical and electrolytic methods are used for pickling. Pipeline anticorrosion only uses chemical pickling, which...

    Points for workers' technical operations:     1. Parameter setting: Set the test pressure value and voltage stabilization time according to the specifications of the petroleum pipe to be tested, the steel grade (in short, the material of the petroleum casing pipe), and the thread type (button type).     2. Perform a full-length hydrostatic test on each petroleum pipe. The actual test pressure and minimum voltage stabilization time must meet the requirements of the process card (sometimes, the voltage stabilization time is appropriately adjusted according to the quality of the raw materials);     3. During the pressure test, always check whether the seals are intact, whether there is leakage, and there are no traces of water leakage;     4. Oil pipe test , pressure control range: ≥ standard hydraulic test pressure;     5. Fill in the hydrostatic test records carefully.     http://www.xysteelpipe.com/inf...

    ERW steel pipe is the abbreviation of electric resistance welding.     The welding method of ERW pipe and submerged arc welded pipe is significantly different. The pressure welding method without filler metal is adopted. The weld is not filled with other components, and the skin effect and the proximity effect of the high frequency current are used to instantaneously heat the edge of the plate. At the soldering temperature, the weld of the forged structure is extruded by a squeeze roll. High-quality steel pipes require heat treatment on the weld line or off-line to refine the microstructure of the weld zone. The weld of the high-quality ERW welded pipe can reach the same level of toughness as the base metal, which cannot be achieved by the submerged arc welding process.     EFW steel pipe is the abbreviation of electric fusion welding.     One of submerged arc welding (SAW)-electric welding (EFW) is a process in which metal is heated by ...

    The seamless steel pipes we use every day need to be done-some cutting treatment and heat treatment. What are the reasons for seamless steel tubes to be treated?     Seamless steel pipe cutting treatment: After straightening the seamless steel pipe, the first inspection of soot blowing is performed to determine the length of the cutting head and tail. The purpose of seamless steel pipe cutting is to remove the ends with cracks, knots, scars, tears and uneven wall thickness to obtain the required fixed-size seamless steel pipe. In addition, the defects that are unqualified and difficult to salvage after removal are inspected. Such as inward folding, internal scarring, severe uneven wall thickness, etc. Generally, the former is cut on the work line, while the latter is cut off-line.     Control of heat preservation time during heat treatment of seamless steel pipe: The heat preservation time of heat treatment of seamless steel pipe should ensure that ...

    J55 casing pipe is a kind of tubing used as the material of petroleum well wall for a long time. It is connected to thousands of kilometers of pipe string through special thread. In the downhole cementing process, it is mainly affected by the external squeeze force, internal pressureand axial tensile load. The oil casing string is completed by perforation method. It also withstands high-temperature, high-energy instantaneous impact loads from perforation blasting.     After analyzing the use of petroleum casing and the inductive judgment of its primary failure mode, petroleum casing manufacturers believe that the performance of the casing should be high strength, high resistance, high crush resistance and high thread joint strength. The advantages of straight seam welding sleeves are uniform wall thickness, high accuracy of a few inches, crush resistance against crushing is 10% ~ 1.5% higher than that of seamless pipes of the same steel type, low carbon content...

    The purpose of thermal deformation of oil casing pipe is not only to obtain the required size, but also to improve the properties of steel. Thermo-mechanical treatment is a general term for a process that utilizes the effects of thermal deformation during production to improve various properties. The heat engine control technology belongs to this category. TMCP is a comprehensive technology that includes controlled rolling and accelerated cooling.     Petroleum casing manufacturers have learned that at present, controlled rolling and controlled cooling technologies have been successfully applied to the production of structural steel such as steel plates and strips, and seamless steel pipes have complex and special existing shapes and complex heat treatment processes. Mill cold control technology is not widely used in industrial production. The results showon-line normalization and on-line accelerated cooling of steel tubes for petroleum casing are the two main ...

    With the rapid development of the petroleum industry, the severe corrosion of buried pipelines, oil well casings and storage tank bottom plates, especially oil well casings, in oilfields has severely affected the production, development, and environment of oilfields. There is corrosion on the inner and outer walls of the casing of oil and gas wells, and the internal corrosion is severe. So, how to protect the anode and cathode of the oil casing? Let us briefly understand:     1. To deal with the corrosion of the inner wall of the casing of the oil well, generally, bactericides, corrosion inhibitors, pH adjustment, closed oxygen barrier skills are added in the annular space of the oil well, and low-strength oil casing is selected in the sulfur oil and gas fields.     2. To deal with the corrosion of the outer wall of the casing of an oil well, the cathode maintenance skills are generally adopted. Now, this has been recognized by the anticorrosion com...