Dimensions of seamless steel tubes for structural pipe weight calculation formula

 Dimensions of seamless steel tubes for structural pipe weight calculation formula

  Dimensions of seamless steel tubes for construction

  Name value

  The outer diameter and wall thickness shall conform to the requirements of GB/T17395< seamless steel pipe.

  length

  1 hot rolling (extrusion, expansion) steel pipe is 3-12m

  2 (TIE) for 2-10.5m steel pipe cold drawing

  Bending degree

  The 1 wall thickness less than 15mm shall not exceed 1.5mm/m

  2 wall thickness of >15-30mm shall not be greater than 2.0mm/m

  The wall thickness of 3 >30mm or greater than or equal to 351mm shall not be greater than 3.0mm/m

  Allowable deviation of outer diameter and wall thickness

  Types of steel pipe

  Steel pipe size

  Allowable deviation

  General level

  senior

  Hot rolling (extrusion, pressure) outside diameter of <50 + 0.50 mm + 0.40mm

  = 50 + 1% + 0.75%

  Wall thickness <4

  12.5%

  (the minimum is + 0.40mm)

  10%

  (the minimum is + 0.30mm)

  More than 4-20

  +15%

  -12.5%

  10%

  >20 + 12.5% + 10%

  Cold drawing (rolling) tube diameter 6-10 + 0.20 mm + 0.10 mm

  >10-30 + 0.40 mm + 0.20 mm

  >30-50 + 0.45 mm + 0.25 mm

  >50 + 1% + 0.5%

  The wall thickness is less than or equal to 1 + 0.15 mm + 0.12 mm

  >1-3 + 15%, – 10% + 10%

  >3 + 12.5, – 10% + 10%

  Note: the external diameter is not less than 351mm of the heat expansion tube, the allowable deviation is + 18%.

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