ASTM A106 Grade B Carbon Seamless Steel Pipe

ASTM A106 Grade B Pipe Dimensions Schedule

ASTM A106 Grade B (ASME SA106 is the standard specification for seamless carbon steel pipe that is employed in high temperature applications. It comprises three grades: A, B and C, with grade A106 B being the most frequently employed. This material is utilized not only for pipeline systems involved in transporting oil and gas, water and mineral slurry, but also for boilers, constructions and structural purposes. Its chemical composition and mechanical properties correspond to those of ASTM A53 Grade B and API 5L B; its yield strength has a minimum value of 240 MPa, while its tensile strength tops at 415 MPa.

ASTM A106 Grade B
ASTM A106 Grade B

Supply Range of IBC Metal Group

It covers pipe sizes in NPS (National Standard Straight) ranging from 1/8 inch to 48 inch (10.3mm DN6 – 1219mm DN1200), while conforming to ASME B 36.10M for nominal wall thickness. This standard specification can also be used for other sizes outside of ASME B 36.10M.

IBC supplied ASTM A106 Grade A, Grade B, Grade C seamless carbon steel pipes as below conditions:

  • Standard: ASTM A106, Nace, Sour service.
  • Grade: A, B, C
  • Outside Diameter: NPS 1/8 inch to NPS 20 inch, 10.13mm to 1219mm
  • Wall thickness Range: 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.

Chemical Composition of ASTM A106 Pipe

 Grade AGrade BGrade C
Carbon max. %0.250.30*0.35*
*Manganese %0.27 to 0.93*0.29 to 1.06*0.29 to 1.06
Phosphorous, max. %0.0350.0350.035
Sulfur, max. %0.0350.0350.035
Silicon, min.%
Chrome, max. %0.400.400.40
Copper, max. %0.400.400.40
Molybdenum, max. %
Nickel, max. %0.400.400.40
Vanadium, max.%

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

Tensile Requirements

 Grade AGrade BGrade C
Tensile Strength, min., psi48,00060,00070,000
Yield Strength, min., psi30,00035,00040,000

Wall Thickness Permissible Variations

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.

Outside Diameter Permissible Variations

Outside Diameter at any point shall not vary from standard specified more than:

NPS [DN Designator]Over in.Over mmUnder in.Under mm
1/8 to 1-1/2 [6 to 40], incl1/64 (0.015)0.41/64 (0.015)0.4
Over 1-1/2 to 4 [40 to 100], incl1/32 (0.031)0.81/32 (0.031)0.8
Over 4 to 8 [100 to 200], incl1/16 (0.062)1.61/32 (0.031)0.8
Over 8 to 18 [200 to 450], incl3/32 (0.093)2.41/32 (0.031)0.8
Over 18 to 26 [450 to 650], incl1/8 (0.125)3.21/32 (0.031)0.8
Over 26 to 34 [650 to 859], incl5/32 (0.156)4.01/32 (0.031)0.8
Over 34 to 48 [850 to 1200], incl3/16 (0.187)4.81/32 (0.031)0.8

ASTM A106, also dubbed ASME SA106, refers to seamless pipes used mainly for transporting gas and liquids from one place to another. These pipes are especially suitable for high-temperature services and are able to withstand considerable pressure. Manufactured according to the ANSI B36.10 / ASME B36.10 dimension standard, ASTM A106 Grade B is the most popular pipe in the market due to its affordability and availability worldwide.

The pipes have a minimum Yield strength of 240 and 275 MPa respectively for grades B and C, with a minimum tensile strength of 415 and 485 MPa respectively. The pipes also demonstrate a minimum elongation of 16.5%/30%. These pipes are made either by cold drawn finish process or Hot finished process. In order to complete the cold draw finish process, Normalizing at 900 deg. C is then required. These pipes are applicable in various industries such as oil and gas refineries, petrochemical plants, boiler, chemical plants, and Shipbuilding.


IBC Metal Group is a leading supplier of Carbon Steel Seamless pipes from China. We supply high-quality pipes to customers around the world, all compliant with NPS/NB measurements, as set in ASME B36.10 and delivered in various thicknesses per customer requirements. Our in-house quality control team inspects all products before shipment; moreover all products are traceable and accompanied by EN 10204 3.1 mill certificates. We guarantee a great price with top-notch services.

ASTM A106 Grade B

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