Seamless carbon steel Pipe is made by hot rolling and piercing a solid billet through it to leave a hollow tube. The pipe is then shaped to size and heat treated to specification. Seamless pipe is very common and considered a higher grade pipe. Applications include high pressure vessels, nozzles and critical applications requiring highest material integrity. Seamless pipe is also pressure tested to ASTM / ASME specification. Grade "B" signifies "seamless". A106 B seamless pipe is easily weldable using various welding procedures. This makes it preferred choice for pressure piping associated with various Oil, Gas and Industrial application. Seamless pipe is also very common in petrochemical industries for carrying high pressure fluid. Trupply offers seamless pipe for convenient online shopping in various lengths. 22 ft pipe is considered SRL "single random length" and actual length can vary from 19' to 22'.
Materials:
ASTM / ASME 106 B. It is considered dual certified (A106B and SA106B)
Size & Dimensions:
Seamless pipe is availabe from 1/8 to 36" NPS.
ASTM A106 and ASME SA106 seamless pressure 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.
ASTM A106 and ASME SA106 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.
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.
| 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 |
| Phosphorous, max. % | 0.035 | 0.035 | 0.035 |
| Sulfur, max. % | 0.035 | 0.035 | 0.035 |
| Silicon, min.% | 0.10 | 0.10 | 0.10 |
| Chrome, max. % | 0.40 | 0.40 | 0.40 |
| Copper, max. % | 0.40 | 0.40 | 0.40 |
| Molybdenum, max. % | 0.15 | 0.15 | 0.15 |
| Nickel, max. % | 0.40 | 0.40 | 0.40 |
| Vanadium, max.% | 0.08 | 0.08 | 0.08 |
| *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% (1.35% for ASME SA106). | |||
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
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.
It is industry standard for steel pipe mills to produce A106 pipe to the same OD tolerance of A53 pipe, with a +/- 1% OD tolerance.
| 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 |
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.
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 | 90 | 12 x nom dia. of pipe | |
| For Close Coiling | 180 | 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
(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.
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
| Quantity | Feet, centimeters, or number of lengths | ||||
| Name of material | Seamless | ||||
| Grade | Grade A, Grade B, or Grade C | ||||
| Manufacture | Hot-finished or cold-drawn | ||||
| Size | NPS or Outside Diameter and Schedule Number of Average Wall Thickness | ||||
| Special outside diameter tolerance pipe | |||||
| Inside diameter tolerance pipe, over 10 in ID | |||||
| Length | Specific or random | ||||
| Supplementary requirements | |||||
| Test Report Required | |||||
| Specification designation | |||||
| Hydrostatic test | |||||
| Special requirements | |||||
*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 %.
The standard covers pipe sizes in NPS (National Standard Straight) from 1/8 inch to 48 inches (10.3mm DN6 – 1219mm DN1200). It also complies with the nominal wall thickness specified in ASME B 36.10M. For sizes that are not covered by ASME B 36.10M, this standard specification can still be used.
The materials used for the ASTM A106 standard specification should be suitable for bending, flanging, or similar forming processes. If the steel material is to be welded, the welding process should be appropriate for this grade of ASTM A106 and suitable for high-temperature working environments.
In cases where a superior or higher grade of ASTM A106 steel pipe is required, the standard provides an optional specification for supplementary requirements. Additionally, these supplementary specifications require additional testing to be conducted when placing an order for pipes that adhere to this standard.
References ASTM standards:
a. ASTM A530/ A530M: This is the standard specification for the common requirements of carbon and alloy pipes.
b. E213: The standard for the Ultrasonic Examination test.
c. E309: The standard for the Eddy Current examination test.
d. E381: The standard for the plan of Macroetch test, for steel products such as steel bars, steel billets, blooms, and forging steels.
e. E570: The standard for the test plan for the flux leakage test of ferromagnetic steel pipes and pipeline products.
f. Related ASME Standard:
g. ASME B 36.10M: The standard specification for nominal sizes of welded and seamless steel pipes.
h. Related Military standard:
i. MIL-STD-129: The standard for the markings of shipment and storage.
j. MIL-STD-163: The standard for the storage and shipment of steel forging products.
k. Related federal standard:
l. Fed. Std. No. 123: The standard for the marking and shipments for civil agencies.
m. Fed. Std. No. 183: The standard specification for continuous ID marking for steel products.
n. Surface standard:
o. SSPC-SP 6: The standard specification for surface preparation.
The ASTM A106 standard specifications for seamless steel pipes consist of three grades: ASTM A106 Gr. A, Gr. B, and Gr. C. With higher-grade materials, the strength performance is improved.
The test methods for ASTM A106 grades A, B, and C include flattening tests, hydrostatic tests, nondestructive electric tests, ultrasonic tests, eddy current tests, and flux leakage tests. These test procedures should be communicated and confirmed with the client to determine which specific tests will be applied.
supplys ASTM A106 Grade A, Grade B, and Grade C seamless carbon steel pipes under the following conditions:
Standard: ASTM A106, Nace, Sour service.
Grade: A, B, C
Range of OD outer diameter: NPS 1/8 inch to NPS 20 inch, 10.13mm to 1219mm
Range of WT wall thickness: SCH 10, SCH 20, SCH STD, SCH 40, SCH 80, to SCH160, SCHXX; 1.24mm up to 1 inch, 25.4mm
Range of length: 20ft to 40ft, 5.8m to 13m, single random lengths of 16 to 22ft, 4.8 to 6.7m, double random length with average 35ft 10.7m
Ends procession: Plain end, beveled, threaded
Coating: Black paint, varnished, epoxy coating, polyethylene coating, FBE and 3PE, CRA Clad and Lined.
ASTM A106/SA106 Gr B SCH 120 CS Seamless Steel Pipes Bevel End is the standard specification for seamless carbon steel pipe used for high-temperature services. It includes three grades: A, B, and C, with Grade B being commonly used. This type of pipe finds applications in various industries, including pipeline systems for oil and gas, water, and mineral slurry transmission. It is also used in boiler systems and for construction and structural purposes.
