Alternative to ERW Pipe: Smart, Reliable Tubing Options

Summary for alternative to erw pipe Discussion

alternative to erw pipe is the core issue here: Sanjay Mantri asked what manufacturing process, besides ERW, could produce CRCA pipe in a very tight outside tolerance of +/- 0.05 mm with a smooth finish for luggage trolleys, where one tube slides reciprocally inside another. The reply says pipe can be hot formed and heat welded rather than cold formed and ERW, but adds an important caution from the answerer: small, thin-walled tubing is often not simply made that way. Instead, after ERW or heat-welded pipe is annealed, it is typically cold drawn to a smaller size and thinner wall, so the likely product he needs is cold drawn seamless tubing. The answer also notes that the required surface finish depends on loading and telescoping frequency, and suggests nickel chrome plating as probably suitable for a luggage trolley, though other finishes may also work.