What is the difference between seamless pipe and other steel pipes?

Ordinary steel pipes, such as water pipes, are generally welded with plates after bending. You can find the weld on it. The diameter of the steel is generally helical.

For seamless pipe, molten steel is usually pressed into the annular seam, and then drawn through the drawing process so that there is no weld. In terms of performance, it is often used in high-pressure equipment, especially in terms of pressure-bearing capacity, which is much higher than ordinary steel pipes.

Such as the pipeline connection of hydraulic equipment. The position of the weld seam of ordinary steel pipes is its weak link, and the quality of the weld seam is also the main factor affecting its overall performance. People living in the north usually have the experience of water pipes or heating pipes in winter. The place to explode is usually the weld. Welded pipes are not seamless steel pipes.

Production process of seamless steel pipe

①The main production process of hot-rolled seamless steel pipe (main test process):

Tube blank preparation and inspection→tube heating→piercing→tube rolling→heating and reheating→fixed (negative) diameter→heat treatment→finished pipe straightening→finishing→inspection (non-destructive, physical and chemical, Taiwan inspection)→warehousing

②The main production process of cold-rolled (drawn) seamless steel pipe

Batching→Pickling Lubrication→Cold Rolling→Heat Treatment→Straightening→Finishing→Inspection

Process flow chart of hot rolling of seamless steel pipe.

Read more ： seamless vs welded pipe

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