ASTM A106 Seamless Steel Pipe
ASTM A106 seamless pressure pipe (also known as ASME SA106 pipe) is commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers, and ships where the piping must transport fluids and gases that exhibit higher temperatures and pressure levels...Send Inquiry
ASTM A106 Seamless Steel Pipe
ASTM A106 seamless pressure pipe (also known as ASME SA106 pipe) is commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers, and ships where the piping must transport fluids and gases that exhibit higher temperatures and pressure levels.
Grade A, Grade B, Grade C
OD:1/2" to 24";
W.T.:4mm to 70mm;
Length:6,000mm to 1,2000mm;
The products are supplied with 3.1 specific test certificates, according to EN 10204. Certification according to 3.2 can be agreed at the time of ordering.
Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.
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.
Hot-finished pipe need not be heat treated.
Cold-drawn pipe shall be heat treated after the final cold draw pass.
Carbon max. %
0.27 to 0.93
*0.29 to 1.06
0.29 to 1.06
Phosphorous, max. %
Sulfur, max. %
Chrome, max. %
Copper, max. %
Molybdenum, max. %
Nickel, max. %
Total of Cr, Cu, Mo, Ni, and V shall not exceed 1%
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.
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 shall be weighed separately by length.
Permissible Variations in Outside Diameter
Outside Diameter at any point shall not vary from standard specified more than:
NPS [DN Designator]
1/8 to 1-1/2 [6 to 40], incl
Over 1-1/2 to 4 [40 to 100], incl
Over 4 to 8 [100 to 200], incl
Over 8 to 18 [200 to 450], incl
Over 18 to 26 [450 to 650], incl
Over 26 to 34 [650 to 859], incl
Over 34 to 48 [850 to 1200], incl
Tensile Strength, min., psi
Yield Strength, min., psi
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 2500 psi for NPS3 and must stay under 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.
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 2-1/2 and larger. Bending Test (Cold) — NPS 2 and under.
Degree of Bend
Diameter of Mandrel
For Normal A106 Uses
12 x nom dia. of pipe
For Close Coiling
8 x nom dia. of pipe
Lengths required shall be specified on order. No “jointers” permitted unless otherwise specified. If no definite lengths required, following practice applies: Single Random — 17′ ~ 24′ lengths Double Random — 36′ ~ 44′ lengths
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, A 106 B, A 106 C. ANSI schedule number. Hydrostatic test pressures and/or NDE; Weight per foot (NPS 4 and larger) or NH if neither is specified. Additional “S” if tested supplementary requirements.
§ ASTM A 530/A 530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
§ ASTM E 213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
§ ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
§ ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings
§ ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
§ ASME B36.10M Welded and Seamless Wrought Steel Pipe
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
Feet, centimeters, or number of lengths
Name of material
Grade A, Grade B, or Grade C
Hot-finished or cold-drawn
NPS or Outside Diameter and Schedule Number of Average Wall Thickness
Special outside diameter tolerance pipe
Inside diameter tolerance pipe, over 10 in ID
Specific or random
Test Report Required
*ASTM A 106 grade B Seamless Pressure Pipe
B) 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 %.
*ASME SA 106 grade B Seamless Pressure Pipe
B) 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 1.35 %.
Edit by Mr. Bruce Zhang of KRM/BSW
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