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Seamless steel pipe dimensional inspection standards

02.20.2024

  • Dimensional inspection standards for seamless steel pipes
    The dimensional inspection standards of seamless steel pipes are one of the important standards for judging the quality of seamless steel pipes. Different countries and regions have different standards. The following are some common domestic and foreign seamless steel pipe dimensional inspection standards:
    1. ASTM standards: ASTM A519, ASTM A106, ASTM A53, ASTM A333, etc.
    2. GB standards: GB/T 8162, GB/T 3087, GB/T 5310, GB/T 6479, etc.
    3. ISO standards: ISO 8535, ISO 2398, ISO 3304, ISO 4200, etc.
    The above standards all specify the size, deviation, length, etc. of seamless steel pipes in detail, and have corresponding inspection methods.

  • Common dimensional deviations and inspection methods of seamless steel pipes
    1. Wall thickness deviation: mainly divided into two situations: positive deviation and negative deviation. Positive deviation means that the wall thickness is greater than the specified value; negative deviation means that the wall thickness is smaller than the specified value. Inspection methods can use theoretical methods, measurement methods, comparative methods, etc.
    2. Diameter deviation: The outer diameter measurement method, inner diameter measurement method, laser track method, cycloidal method, etc. are mainly used for inspection.
    3. Length deviation: The measurement method is mainly used for inspection.
    The above are the common dimensional deviations and inspection methods of seamless steel pipes. Different standards also have different regulations on the deviation range.

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