ASTM A53 & ASME SA53 Pipes and Tubes

A53 Comparative Specifications

MECHANICAL PROPERTIES – TENSILE REQUIREMENTS

CHEMICAL REQUIREMENTS FOR A53

• Testing Requirements for seamless and welded API 53 steel pipe
  • Hydrostatic Testing test pressures for plain and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and ERW pipe.
  • Mechanical Tests:
    • Tensile Test: Two transverse tests required on the ERW for NPS 8 and larger, one across the weld and one opposite the weld.
    • Flattening Test: On ERW for NPS 2 and larger, STD and XS wall (not required for XXS pipe)
    • Bending Test (cold): For NPS 2 and under, XS wall and under; for NPS 1-1/4 and under, XXS wall

    	Degree of Bend	Diameter of Mandrel
    For normal A53 users	90	12 x nom. diameter of pipe
    For Close Coiling	180	8 x nom. diameter of pipe

  • Number of Tests: Seamless and Electric Resistance Weld (ERW) – bending, flattening, tensile on one length of pipe from each lot of 500 lengths, or less, of each pipe size.
• Permissible Variations for A53 steel pipe
  • Wall thickness: The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
  • Weights per foot are plus or minus 10%
  • Outside diameter: Outside diameter at any point shall not vary from standard specified more than:

  NPS	Over	Under
  1-1/2 and smaller	+1/64”	-1/64”
  2 and larger	+1%	-1%

• Lengths of A53 steel pipe
  GNEE Steel Tubular Products A53 seamless and welded steel pipe is produced in random lengths 16’ – 22’ or 32’ – 44’, in multiple lengths, and in specific cut lengths.
• Marking Requirements
  Rolled, die-stamped, ink-printed, or stenciled (manufacturer’s option).
  • Manufacturer’s name, brand, or trademark
  • Size and wall
  • Steel grade
  • ASTM A53