Technical Information View All Pipe

ASTM A106 pipe is a seamless carbon steel alloy pipe intended for high temperature and high-pressure applications. A106 pipe is suitable for flanging and bending, and it used in industrial applications including, but not limited to: process piping, boiling plants, compression stations, refineries, and steam lines.


MSI Supply is a Pipe Distributor in Houston, TX that provides A106 pipe from 1/8" to 24" in diameter, with wall thickness ranging from schedule 10 to XXH. A106 pipe comes in both single (~20 ft) and double (~40 ft) random lengths. MSI also offers a number of different manufacturers for its A106 pipe. A list of a few of these manfacturers, along with some technical specifications for A106 pipe, can be seen below.

A106 Pipe Ordering Information

Required Information for Ordering

Characteristic What to Specify
Quantity Feet or number of lengths
Size NPS (Outside Diameter) and Schedule Number (Average Wall Thickness)
Grade Grade A, Grade B (most common), or Grade C
Coating Bare, Black, FBE, etc
Manufacturer Approved Manufacturer List (AML), or Country of Origin restrictions

A106 Pipe Manufacturing Considerations


  • Hot Finish vs Cold Drawn A106 Pipe: Nominal A106 Pipe Sizes 1-1/2" and below may be either cold drawn or hot finished. A106 pipe sizes 2" and larger are hot finished, unless otherwise specified.
  • Purchaser may specify NDE in lieu of hydrostatic test or neither.
  • Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly combined with separate degassing or refining.
  • Steel cast in ingots or strand cast is permissible.
  • Heat Treating: Hot-finished pipe need not be heat treated. Cold-drawn pipe shall be heat treated after the final cold draw pass.

Wall Thickness (and Weight)

  • Wall thickness: The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified for the pipe.
  • Weights per foot: The weight of any individual length shall not vary more than 10% over or 3.5% under specification. However, NPS 4" and smaller are weighed in lots. Larger diameter joints are weighed individually.


Outside diameter: The outside diameter shall not vary from standard specified in the chart below, at any point.

NPS Over Under
1/8 to 1-1/2 1/64 (0.015) 1/64 (0.015)
Over 1-1/2 to 4 1/32 (0.031) 1/32 (0.031)
Over 4 to 8 1/16 (0.062) 1/32 (0.031)
Over 8 to 18 3/32 (0.093) 1/32 (0.031)
Over 18 to 26 1/8 (0.125) 1/32 (0.031)
Over 26 to 34 5/32 (0.156) 1/32 (0.031)
Over 34 to 48 3/16 (0.187) 1/32 (0.031)



  • Lengths of A106 seamless carbon steel pipe
  • Single random – 16’ – 24'
  • Double random – 36' – 44’

A106 Pipe Marking Requirements

Mark may be applied via: Rolled, die stamped, or paint stenciled (manufacturer’s option).

Content shall include: 

  1. Manufacturer’s name, brand, or trademark
  2. A106 A, A106 B, or A106 C
  3. Hydrostatic test pressure and/or NDE, or NH if neither is specified
  4. Size, length, weight per foot (NPS 4 and larger)
  5. ANSI schedule number or weight class or wall thickness
  6. Additional “S” if tested supplementary requirements

ASTM A106 Pipe Grades

A106 Pipe Mechanical Properties

  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


A106 PIpe Chemical Requirements

Total of Cr, Cu, Mo, Ni, and V shall not exceed 1%

Element Grade A Grade B Grade C
Carbon (max %) 0.25 0.3 0.35
Manganese % 0.27 – 0.93  0.29 – 1.06  0.29 – 1.06 
Phosphorus (max %)  0.035 0.035 0.035
Sulfur (max %) 0.035 0.035 0.035
Silicon (min %) 0.1 0.1 0.1
Copper* (max %) 0.4 0.4 0.4
Nickel* (max %) 0.4 0.4 0.4
Chromium* (max %) 0.15 0.15 0.15
Molybdenum* (max %) 0.08 0.08 0.08
Vanadium* (max %) 0.08 0.08 0.08


*These five elements combined shall not exceed 1% total composition (2010)

Unless otherwise specified by the purchaser, for each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.65 %.

A106 Pipe Testing Requirements

A106 Pipe Hydrostatic Tests:

Hydrostatic Testing: Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum pressures are not to exceed 2,500 psi for NPS 3" and under, and 2,800 psi for larger sizes. Pressure is maintained for no less than 5 seconds.

A106 Pipe Mechanical Tests:

  • Tensile Test: Either transverse or longitudinal are acceptable for NPS 8" and larger
  • Longitudinal testing only for tensile tests on sizes smaller than NPS 8"
  • Flattening Test only for NPS 2" and larger
  • Bending Test (cold) only for NPS 2 and under
  Degree of Bend   Diameter of Mandrel
For normal A106 uses    90  12x nominal diameter of pipe
For close coiling 180  8x nominal diameter of pipe


Number of Tests: One tensile test per 200 lengths.

  NPS On one length from each lot of:
Tensile  5 and smaller   400 or less
6 and larger      200 or less
Bending 2 and smaller 400 or less
Flattening  2 through 5 400 or less
6 and larger 200 or less


A106 Pipe Manufacturers

Manufacturer Country
Arcelor Mittal Romania
Chomutov Czech Republic
Heng Yeng China
Huta Batory Poland
Jiangu Chengde Steel Tube China
Lubao Steel China
Mittal Steel Czech Republic Romania
Niko Tube Ukraine
NKK / Tenaris Japan
Productos Tubulares Spain
Sharon Tube USA
Siderca Argentina
Suzhou Seamless China
Tamsa Mexico
Tenaris Italy
Tubos Reunidos Spain
US Steel USA
V&M  Germany
Vallourec Europe
Vallourec Star USA
Voest Alpine Austria
Volzhsky Russia
YYC China