Pipe: Grades & Specifications ASTM A106

Seamless Carbon-Steel Pipe for High-Temperature Service
Pipe Specification A106
Specification A106 NPS 1/8 -- 48 ANSI Schedules to 160
Scope 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.
Kinds of Steel
Permitted For
For Pipe Material
Killed Steel
Open-hearth
Electric-furnace
Basic-oxygen
Hot-Dipped
Galvanizing
Not covered in specification.
Permissible Variations
in Wall Thickness
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Chemical
Requirements
  Grade A Grade B Grade C
Carbon max. % 0.25 0.30 0.35
Manganese % 0.27 to 0.93 0.29 to 1.06 0.29 to 1.06
Phosporous, max. % 0.025 0.025 0.025
Sulfur, max. % 0.025 0.025 0.025
Silicon, min. % 0.10 0.10 0.10
Tensile
Requirements
Seamless
  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
Hydrostatic
Testing
Inspection test pressures produce a stress in the pipe wall equal to 60% or specified minimum yield strength (SMYS) at room temperature.

Maximum Pressures are not to exceed 2500 psi for NPS 3 and under and 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.
Permissible Variations
in Weights per Foot
Weight of any length shall not vary more than 10% over and 3.5% under that specified. NOTE - NPS 4 and smaller - weighed in lots. Larger sizes - by length
Permissible
Variations in
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" 1/32"
2 -- 4 1/32" 1/32"
5 -- 8 1/16" 1/32"
10 -- 18 3/32" 1/32"
20 -- 26 1/8" 1/32"
Mechanical Tests
Specified
Tensile Test - NPS 8 and larger - either transverse or longitudinal acceptable

Smaller than NPS 8 -- weighed in lots. Larger sizes -- by length.

Flattening Test - NPS 2 and larger.

Bending Test(Cold) - NPS 2 and under.

For normal A106 uses:
Degree of Bend  = 90
Diameter of Mandrel = 12 x nom. dia. of pipe

For close coiling:
Degree of Bend  = 180
Diameter of Mandrel = 8 x nom. diameter of pipe
Number of
Tests Required
  NPS On One Length From Each Lot of
Tensile 5 and smaller 400 or less
  6 and larger 200 or less
Bonding 2 and smaller 400 or less
Flattening 2 through 5 400 or less
  6 and over 200 or less

Lengths Lengths required shall be specified on order. No "jointers" permitted unless otherwise specified. If no definite lengths required, following practice applies:

Single Random -- 16' - 22'. 5% may be 12' - 16'

Double Random -- Minimum length 22', Minimum average 35'. 5% may be 16' - 22'.
Required Markings
on Each Length
(On Tags attached to
each Bundle in case
of Bundled Pipe)
Rolled Stamped or Stenciled (Mfrs. option)
• Manufacturer's name or brand.
• Length of pipe.
• A106 A, A106 B, A106 C. ANSI schedule number.
• Hydrostatic test pressure and/or NDE or NH if neither is specified
• Weight per foot (NPS 4 and larger)
• Additional "S" if tested supplementary requirements.
General
Information
* Unless otherwise specified, pipe furnished with plain ends.
* Purchaser may specify NDE in lieu of hydrostatic test or neither.
* Surface finish standards are outlined in specification.
  
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