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General Description

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Specification A106 covers Seamless carbon steel nominal wall pipe for high-temperature service, suitable for bending, flanging and similar forming operations. NPS 1 1/2 and under may be either hot finished or cold drawn. NPS 2 and larger shall be hot finished unless otherwise specified. Surface finish standards are outlined in the specification. Purchaser may specify NDE in lieu of hydrostatic test or neither. Unless otherwise specified, pipe is furnished with plain ends.

Mechanical Properties - Tensile Requirements

Seamless and ERW Grade A Grade B Grade C
Tensile Strength, min., psi
48,000 60,000 70,000
Yield Strength, min, psi
30,000 35,000 40,000

Chemical Requirements

Seamless and ERW Grade A Grade B Grade C
Carbon max. %
0.25 0.30 0.35
Manganese %
0.27 - 0.93 0.29 - 1.06 0.29 - 1.06
Phosphorus, max %
0.035 0.035 0.035
Sulfer, max. %
0.035 0.035 0.035
Silicon, min. %
0.10 0.10 0.10

Testing Requirements

  • Hydrostatic Testing

    Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strenth (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS 3 and under, and 2800 spi for the larger sizes. Pressure is mantained for not less than 5 seconds.
  • Mechanical Tests

    Tensile Test NPS 8 and larger - either transverse or longitudinal acceptable.
    Flattening Test NPS 2 and larger.
    Bending Test (cold) NPS 2 and under.
      Degree of Bend Diameter of Mandrel
    For Normal A106 Uses
    90 12 x dia. of pipe
    For Close Coiling
    180 8 x dia. of pipe

    Number of Tests

      NPS On One Length
    From Each Lot of
    5 and smaller
    6 and larger
    400 or less
    200 or less
    2 and smaller 400 or less
    2 through 5
    6 and over
    400 or less
    200 or less
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