At present, there are many spiral steel pipe manufacturers in China, but all manufacturers will have the problem of declining spiral steel pipe output. Therefore, when purchasing, be sure to ask how big the gap is, not just blindly look at the price of spiral steel pipe.
The deviation range of national standard spiral steel pipe (GB/T9711-1997) for diameters less than 508 is 12.5% up and down, and 10% up and down for 508 spiral steel pipe.
The deviation range of spiral steel pipes marked below 508 (SY/T5037-2008) is 12.5% of spiral steel pipes above 508 and 10% of spiral steel pipes above 508.
