At the coming moment, Tube China will be held in Shanghai China from 14th -16th June 2023, This is the first large-scale pipe fair after 3 years of COVID-19, and it will be a good business gathering.  

The 10th China International Tube Exhibition (Tube China) was successfully concluded in Shanghai New International Expo Center on June 16 with the care and support of all walks of people.

Straight seam welded steel pipes are divided into high frequency resistance welding and submerged arc welding according to the welding process. Straight seam submerged arc welding is referred to as LSAW, and longitudinal high frequency resistance welding is referred to as ERW.Compared with submerged arc welding, high frequency electric resistance welded steel pipes (ERW steel pipes) do not add any welding materials during the welding process in the ERW process, and the weld formation does not undergo a thermal melting state, but the weld metal undergoes a recrystallization process. Therefore, the formed weld seam is completely consistent with the chemical composition of the base metal. After the steel pipe is welded, it is annealed to produce the cold working internal stress and welding internal stress. Therefore, the comprehensive mechanical properties of the ERW steel pipe are better.

LSAW steel pipe is a welded pipe produced by pressing (rolling) the steel plate into a tube blank in a mold or a forming machine, and using a double-sided submerged arc welding method and expanding the diameter. The finished product has a wide range of specifications, good toughness, plasticity, uniformity and compactness of the weld, and has the advantages of large pipe diameter, pipe wall thickness, high pressure resistance, low temperature resistance and strong corrosion resistance.LSAW steel pipe expansion is a pressure processing process that uses hydraulic or mechanical means to apply force from the inner wall of the steel pipe to expand the steel pipe radially outward. The mechanical method is simpler and more efficient than the hydraulic method, and the steel pipe machining is more accurate under the condition of high precision.The expansion process of LSAW steel pipe is divided into mechanical expansion and hydraulic expansion.

Longitudinally Submerged Arc Welding pipe(abbreviated as LSAW pipe). The Longitudinally Submerged Arc Welding (LSAW) is produced by using a single plate as a raw material, pressing (rolling) the steel plate into a pipe blank in a mold or a molding machine, and adopting double-sided submerged arc welding and expanding the diameter. The finished product has a wide range of specifications, and the weld has good toughness, plasticity, uniformity and compactness, and has the advantages of large pipe diameter, thick pipe wall, high pressure resistance, low temperature resistance and corrosion resistance.

The production process of general seamless steel pipes(smls pipe) can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is generally more complicated than that of hot rolling. In the sizing test, if the surface does not respond to cracks, the pipe must be cut by a cutting machine and cut into a blank of about one meter in length. Then enter the annealing process. Annealing needs to be pickled with acidic liquid. When pickling, pay attention to whether there is a lot of blistering on the surface. If there is a lot of blistering, it means that the quality of the steel pipe does not meet the corresponding standards. In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes. Much rough, without too many burrs.

Steel pipes, also known as steel tubes, are hollow cylindrical constructions manufactured from steel, a strong and flexible material noted for its durability and resistance to corrosion. There are different kinds of steel pipes available, including seamless pipes and welded pipes. Seamless pipes are manufactured without any welding joints, while welded pipes are constructed by joining two pieces of steel using welding techniques.

Raw material begins in the form of hot extruded seamless pipe, which is then cold reduced and processed through tube reducers in a long, straight form. Cold reducing is the most effective manufacturing method for longer lengths of tubing. Rolled pipes are cut to the required lengths and cleaned to remove debris in preparation for heat treatment, which is applied to remove any stresses that could occur during the formation or welding process.Various heat treatments can be used for tubing manufacturing, particularly annealing – this improves the structure of the metal and makes it more ductile for use in applications.

ERW steel pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes.

When selecting the right metal for your job, there are several factors that you need to consider:Hardness– capacity to resist abrasion, but also difficulty in being cut or drilledStrength– the amount of force necessary to deform the metalToughness– ability to resist stress (and not break)Malleability – the ability of the metal to deformWeldability– ability to be welded (it’s a function of melting point, heat conductivity, etc.)Download a thorough spreadsheet which explains the popular steel grades in detail here.

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