The permissible standards for seamless steel pipes are specified in GB/T, covering dimensions, shape, weight, and allowable deviations. When purchasing seamless steel pipes for fluid conveyance, the standard GB/T 8163-2008 "Seamless Steel Pipes for Fluid Conveyance" should be followed. For hot-rolled steel tubes, the outer diameter tolerance is ±1% of the nominal diameter or ±0.50 mm, whichever is greater. If the nominal outer diameter is less than or equal to 102 mm, the wall thickness tolerance is ±12.5% of the nominal thickness or ±0.40 mm, whichever is larger. For cold-drawn steel tubes, the outer diameter tolerance is ±1% of the nominal diameter or ±0.30 mm, whichever is greater. If the nominal wall thickness exceeds 3 mm, the wall thickness tolerance is +12.5% or -10% of the nominal thickness. These specifications ensure that the pipes meet quality and performance requirements for various applications, including industrial and construction use. Adhering to these standards helps maintain safety, reliability, and consistency in pipeline systems.
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