Diameter Expansion Method of LSAW Steel Pipe
Date:2022-05-12View:522Tags:LSAW Steel Pipe, Diameter Expansion Method
Now everyone should know that when we use LSAW steel pipe, if the diameter of the steel pipe is small, we will prepare to expand the diameter, so do you know how to expand the diameter of LSAW steel pipe? Please follow me to find out.
1. Preliminary rounding stage. The fan-shaped blocks are opened until all the fan-shaped blocks are in contact with the inner wall of the steel pipe. At this time, the radius of each point in the inner circular pipe of the steel pipe within the range of the step size is almost the same, and the steel pipe is initially rounded.
2. Nominal inner diameter stage. The fan-shaped block starts to reduce the movement speed from the front position until it reaches the required position, which is the inner circumference position of the finished pipe with quality requirements.
3. Repetition compensation stage. The fan-shaped block starts to further reduce the speed at the position of stage 2 until it reaches the required position, which is the inner circumference position of the steel pipe before the rebound required by the process design.
4. Stable pressure holding stage. The inner circumference of the steel pipe remains stationary for a period of time before the sector block is bounced back, which is the pressure-holding and stable stage required by the equipment and the expansion process.
5. Unloading return stage. The fan-shaped block rapidly retracts from the inner circumference of the steel pipe before the rebound until it reaches the initial diameter expansion position, which is the minimum shrinkage diameter of the fan-shaped block required by the expansion process.
The LSAW steel pipe is a pipe material produced by pressing (rolling) the steel plate into a pipe blank in a mold or a forming machine, and using a double-sided submerged arc welding method and expanding the diameter. According to its different forming methods, it is divided into UOE, RBE, JCOE steel pipe and so on. LSAW steel pipe has the characteristics of relatively simple process and rapid and continuous production. It is widely used in civil construction, petrochemical, light industry and other sectors. It is also used to transport low-pressure fluids or be made into various engineering components and light industrial products.
LSAW steel pipe has a wide range of finished product specifications, and the weld has good toughness, plasticity, uniformity and compactness, and has the advantages of large pipe diameter, pipe wall thickness, high pressure resistance, low temperature resistance and strong corrosion resistance. In the construction of high-strength, high-quality long-distance oil and gas pipelines, most of the steel pipes required are large-diameter thick-walled straight seam submerged arc welded pipes.
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