I would like to ask: for DN500 stainless steel pipes, are seamless pipes or welded steel pipes generally used?
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I would like to ask everyone: for carbon steel pipes, seamless pipes are generally used for DN200 and below, while welded steel pipes are used for larger diameters. What about stainless steel pipes?
Whether a steel pipe is seamless or welded depends on factors such as the pressure and temperature of the medium, and has nothing to do with the pipe diameter. There is no such thing as seamless pipes being used for DN200 and below, and welded steel pipes being used for those above.
Those below 450 are generally seamless steel pipes
This year I will manufacture air compressor inlet pipes with a diameter of DN450, made of stainless steel seamless tubes; whether to use seamless or welded tubes depends on the operating conditions
It depends on the medium and pressure; each case must be analyzed individually, as there is no universal rule.
The pipes mentioned here can be either seamless pipes or welded steel pipes; all I want to know is which one is typically chosen in designs
This depends on the conveying medium, temperature, and pressure. If you are transporting gases at atmospheric pressure or at only a few kPa, which are non-toxic, harmless, and have low corrosivity, welded pipes with a diameter of DN200 can also be used, with a wall thickness of 2 mm or 3 mm being sufficient.
This is because there are few manufacturers that produce large-diameter seamless steel pipes, making them difficult to obtain
Yes, so I’m wondering whether for stainless steel pipes of large diameter, there are more seamless pipes or welded pipes
Based on our factory’s purchasing patterns, for values below 200, seamless pipes are generally purchased, while for values above 250, spiral-welded steel pipes are used; straight-welded pipes are also used in some cases