The permissible standard for seamless steel pipes is defined by GB/T, which specifies the dimensions, shape, weight, and allowable deviations. When purchasing seamless steel pipes for fluid transportation, the standard GB/T 8163-2008 "Seamless Steel Pipes for Fluid Conveyance" applies. For hot-rolled steel tubes, the outer diameter tolerance is ±1% of the nominal diameter (D) or ±0.50 mm, whichever is greater. If the nominal outside diameter is less than or equal to 102 mm, the wall thickness tolerance is ±12.5% of the nominal thickness (S) or ±0.40 mm, whichever is larger. For cold-drawn steel tubes, the outer diameter tolerance is ±1% D or ±0.30 mm, whichever is greater. When the nominal wall thickness exceeds 3 mm, the wall thickness tolerance is +12.5%S and -10%S. These standards ensure that the pipes meet quality and performance requirements for various industrial applications, guaranteeing safety and reliability in fluid transport systems.
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