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General Description

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Specification A53 covers Seamless and Welded, black and hot-dipped galvanized nominal (average) wall pipe for coiling, bending, flanging, and other special purposes and is suitable for welding.

Mechanical Properties - Tensile Requirements

Seamless and ERW Grade A Grade B
Tensile Strength, min., psi 48,000 60,000
Yield Strength, min., psi 30,000 35,000

Chemical Requirements

Seamless and ERW C max % Mn max % P max % S max %
Grade A
0.25 0.95 0.05 0.045
Grade B
0.30 1.20 0.05 0.045

Testing Requirements

  • Hydrostatic Testing

    Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of Seamless and Electric Resistance Weld Pipe.
  • Mechanical Tests

    Tensile Test Transverse required on ERW for NPS 8 & larger.
    Flattening Test For NPS 2 and larger, STD and XS walls.
    (Not required for XXS pipe)
    Bending Test (cold) For NPS 2 and under, XS wall and under
    For NPS 1 1/4 and under, under XXS wall.
      Degree of Bend Diameter of Mandrel
    For Normal A53 Uses
    90 12 x dia. of pipe
    For Close Coiling
    180 8 x dia. of pipe
  • Number of Tests

    Seamless and Electric Resistance Weld - Bending, flattening, tensile on one length of pipe from each lot of 500 lengths, of each pipe size.

Permissible Variations

  • Wall Thickness

    The minimum wall thickness at any point shall not be more than 12.5% under the nominal thickness specified.
  • Weights per Foot

    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
    For Close Coiling
    +1% -1%
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