steel tube

    Hot-rolled seamless steel pipe production is one of the important processes, the rational development of its process plan or not, a direct impact on the size of the steel pipe after rolling the surface of the precision and quality,     Unreasonable process plan will cause the inner surface of the steel pipe to produce the defects such as folding, crack and concave.     N80Q steel casing is a standard oil casing commonly used in oil (for the seamless steel pipe), the standard provisions of the finished pipe heat treatment process for quenching and tempering.     N80Q casing production process is as follows: furnace refining → continuous casting → annular furnace → perforation → continuous rolling → stepping furnace → sizing → sawing → tempering treatment → straightening → physical and chemical testing → testing → thread processing → Coupling tight → water pressure test → measuring length weighing, marking → packaging storage. The billet ...

    The heat treatment after welding is a new technique to eliminate residual stress. Preheating the material to the post-heat treatment temperature before welding and welding of the workpiece continued to keep the heating temperature, the use of insulation after the completion of the insulation of cotton to its slow cooling. This method can effectively reduce the welding residual stress and improve the stress corrosion resistance of metal.     After welding heat treatment can effectively reduce the welding residual stress, and the higher the heat treatment temperature, the better the residual stress elimination effect. The heat treatment of large diameter lsaw steel pipe can effectively improve the stress corrosion resistance of large diameter steel pipe. The higher the temperature of post-heat treatment, the more remarkable the stress corrosion resistance is. Diffusion method Metal carbide coating technology is the workpiece placed in special media, the prolifer...

    In order to detect the transverse or longitudinal defect of the weld of LSAW longitudinal seam, ultrasonic testing was carried out by jet (water column) coupling. Jet (water column) ultrasonic flaw detection is the probe and the pipe through the jet coupling between the probe issued by the longitudinal wave beam through the water or steel interface into the steel pipe, through the waveform conversion of the steel pipe welds pure shear wave detection.     Therefore, the realization of the weld in the pure shear wave detection, the probe angle of incidence must be between the critical angle and the critical angle between the II, can be derived from the law of refraction. The critical angles of the first and second critical angles of incident longitudinal waves from the water to steel are calculated to be 14.5 °and 27.3 °, respectively.     Longitudinal welded pipe Ultrasonic Inspection: Nondestructive testing is on-site testing, fast and non-destructi...

    Standard would be an important factor for customers when they choose steel pipe no matter seamless steel pipe, or welded steel pipe. And for every order, we'll provide a MTC to you before delivery.     Here is it:     ASTM A252 LSAW steel pipe-Fluid Transportation Pipes:     Additions:     Thickness: 6-60MM     Size: 310-1420mm     Material: Q195,Q215,Q235,Q345(B,C,D,E)     Certification: API ABS CE     ASTM A671 / A672 CL10-CL13-Fluid Transportation Pipes:     Out Diameter: 323.9mm -1820mm(12''-72'')     Wall Thickness:5.0 - 50mm     Length:6 – 12m     ASTM A53 LSAW steel pipe-Fluid Transportation Pipes:     Out Diameter: 323.9mm -1820mm(12''-72'')     Wall Thickness:5.0-50mm     Length:6–12m     ASTM A179, ASTM A192, ASTM A210 of Seamless Steel Pipe-Carbon Steel Pipe:   ...

    Seamless stainless steel pipes are the preferred choice for high-temperature applications across industries due to their several superior properties. They possess greater strength under loading, exhibit exceptional corrosion resistance, can withstand shocks and vibrations, and offer reliable performance even under the toughest and harsh conditions. Due to these benefits, seamless stainless steel tubes and pipes are used in heating-pipelines, containers, coal-saving devices, super-heaters and repeaters, high press boiler, heat exchanger and condenser tubes, mechanical and structural tubing, among several others. This post discusses the various material grades of stainless steel used for producing these seamless pipes and tubes.     Grades of Stainless Steel Used in Producing Seamless Tubes and Pipes     Steel tubes and pipes used for the high-temperature applications must be of superior quality to resist high temperatures ranging from 400 degree Cels...

    Steel tube is used in a variety of structural and industrial applications, such as automobile transport, architecture, and construction. These steel tubes are made of different steel structures, from stainless steel, carbon, zinc or soft steel, depending on the application requirements.     Steel tubing is divided into two classes: mechanical and structural, depending on its design. So what is the difference between mechanical and structural steel tube? Below are some points to consider while differentiating the two types of steel tubing. The comparison is made on the basis of application, specification, and shape.     Comparison between mechanical and structural steel tube     Application: Mechanical tubing is used in low stress and light gauge structural applications. These applications include conveyor belt components, solar panel supports, greenhouse structures, kitchens and restaurants, hospitals and medical equipment, and various t...

    1. From the spiral steel pipe looks. In appearance is to pay attention to those welded joints, seen the appearance is not a drawback, there is a lack of scale, which can be seen through the naked eye, of course, detailed and bilateral theory, Borrow a standard model, gauge and magnifying glass to view. Because of the appearance of welding defects, which means the spiral pipe inside most likely also flawed, even the appearance of effort are not done, inside the effort is difficult to ensure.     2. View approach is to use equipment to view, that is, without the risk of pipe to borrow the case of ultrasonic flaw detection, ray detection, penetration testing, and magnetic flaw detection method can see the spiral pipe has not see the defects. In addition to the defective view, the intensity of the pressurized container is also viewed. Usually there are two kinds of water pressure test and air pressure test. Such a view is to see the spiral steel pipe weld fineness...

    The spiral steel pipe is formed by spiral bending of strip steel or coiled plate and is welded with double-side submerged arc welding. The steel pipe is widely used in water, electricity and chemical industry for the following reasons.     1) As long as the change in forming angle, you can use the same width of the strip production of various diameter steel pipe, easy to transfer type.     2) Weld spiral evenly distributed throughout the circumference of the spiral tube, so the size of the spiral tube high precision, strength is also strong.     3) Because it is continuous bending, so the length of spiral pipe length is not restricted, the length can be arbitrarily set.     4) Easy to change the size, suitable for small quantities, more varieties of the production spiral.     Spiral steel pipe with the same specifications than the straight seam welded pipe length, the same specifications wall thickness, the spira...

    Usage of spiral steel pipe is relatively high, the application is very wide, it should be how to choose before in the selection to pay attention to quality.     The first method is a more professional detection method, that is, by the strength of the pressure vessel to be detected. Commonly, we use atmospheric pressure and water pressure to detect, in this way can detect the working conditions of the spiral steel pipe in the pressure working environment, but also to detect the tightness of the spiral steel pipe, generally take the atmospheric pressure detection, because such security Relatively high, and if the water vapor pressure through the test, then the need to remove the spiral pipe after the water, too much trouble.     The second method is also relatively simple, that is, through the surface of observation. With the naked eye found in the spiral steel pipe in the welding and size of the problem, if necessary, you can also use the standard s...

    API 5L seamless tube is characterized by a large diameter, wall thickness is relatively thick, so according to this feature make full use of ultrasonic detection of eddy current and internal and secondary surface detection features combined to achieve "no blind spot" testing. Through the use of "steel pipe rotation, detection probe forward combination", not only solve the problem of detecting the title, but also solve the space occupied by narrowing the space.     Therefore, at home and abroad for the seamless pipe testing, the general use of magnetic flux leakage test or water pressure. In China, there is no good performance for the seamless magnetic flux leakage detection equipment produced, once the use of that need to import. Imported magnetic flux leakage testing equipment is expensive, the majority of domestic enterprises difficult to accept; and water pressure test efficiency is low, labor-intensive, especially when the operator responsibility is not hi...

    As the individual quality of spiral steel pipe is relatively large, it must be stacked in the outdoors, but it will be difficult to avoid the sun and rain, so the problem has been plagued with rust spiral pipe storage time and conditions. Therefore, we need to conduct a comprehensive understanding of the spiral steel pipe rust prevention.     The main use of steel wire brush and other tools on the steel surface grinding, spiral steel pipe cleaning and preheating can be removed loose or tilt of the oxide, rust, welding slag and so on. Hand tools to achieve rust Sa2 level, power tools rust can be achieved Sa3 level, if the steel surface attached to a solid oxide scale, tool rust effect is not ideal, less than anti-corrosion construction requirements of the depth of the anchor pattern. Pickling     The use of solvents, emulsion cleaning low pressure fluid delivery welded steel pipe surface, in order to achieve the removal of oil, grease, dust, lubrica...

    1. Repair mouth     In order to ensure the quality of the welding, the welding is carried out before the full inspection and correction, so that the pipe end, bevel angle, blunt edge, roundness, etc., are in line with the requirements of the interface size, individual steel pipe needs In the field to do groove processing, the use of gas welding cutting, remove the slag and then grinding with a grinding wheel.     Counter operation procedures are: check the interface connector size → clear chamber → determine and adjust the longitudinal seam of the steel pipe staggered position → the first pipeline straight → adjust the gap size of the counterparts → leveling the mouth → straight → straight line → spot welding     2. Welding     Interface welding using arc welding, once down the base, two times to survive, each weld are welded once, each layer of welding lead-off arc to be staggered.     A. Pipe joints should be fi...

    Spiral steel pipe in the factory should do before the mechanical performance test and flattening test and flaring test, and to meet the requirements of the standard requirements.     Spiral steel pipe quality testing methods are as follows:     1, From the surface to judge, that is, in the appearance of inspection. The appearance of the welded joint inspection is a simple procedure and a wide range of inspection methods, is an important part of the finished product inspection, mainly to find the weld surface defects and size of the deviation. Generally through the naked eye observation, with the standard model, gauge and magnifying glass and other tools for testing. If there is a defect on the surface of the weld, there may be a defect in the weld.     2, The physical method of inspection: the physical test method is the use of some physical phenomena for testing or testing methods. Materials or parts of the internal defects of the insp...

    ASTM material standards are developed by the American Society for Materials and Testing, ASTM material standards can include the chemical, mechanical, physical and electrical properties of the material. These standards include both a description of test methods to be performed on building materials, and the size and shape that these materials are to take. Building materials like concrete can be required by local law to meet ASTM standards before being used in construction. Among ASTM A53 and ASTM A106 are widely used.     ASME is the standard of the American Society of Mechanical Engineers. ASME material specifications are based on those published by the ASTM, AWS and other recognized national and international standards. ASME standards are legally required when building infrastructure like bridges, power plant piping and boilers. Among ASME b16.5 are widely used.     ASTM is responsible for the development and re-enactment of standards for all type...

    SSAW steel pipe is the steel pipe with spiral seam that using strip coil as raw material, extrusion forming under normal temperature, and welding by automatic Double wire double-sided submerged arc welding process. Classification of SSAW steel pipe includes:     1. SSAW steel pipe (SY5038-83) used for pressurized fluid transportation, it is welded with high-frequency welding method. The loading capacity of it is powerful, the plastic is good, and it is easy to weld and machine shaping.     2. SSAW steel pipe (SY5036-83) used for pressurized fluid transportation is mainly used for conveying oil and natural gas pipeline.     3. SSAW steel pipe (SY5037-83) used for general low-pressure fluid transmission, it is welded with double-sided automatic submerged arc welding method or one-side welding method, it is mainly used for water, gas, air and steam and other general low-pressure fluid delivery.     Now general standards for SSAW...