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ASTM A106 Gr.B Seamless Steel Pipe
ASTM A106 Gr.B is a seamless carbon steel pipe designed for high-temperature service. As part of the ASME B36.10 standard, ASTM A106 Gr.B pipes are renowned for their reliable performance in elevated-temperature environments. The specification covers seamless piping components manufactured through hot-finished or cold-drawn processes. These pipes are produced by piercing solid billets, resulting in a seamless construction that offers superior pressure resistance and high-temperature durability compared to welded pipes, making them ideal for transporting steam, hot water, oil, and gas under demanding conditions.
ASTM A106 Grade B Material Specification
| Standards | ASTM, ASME and API, ANSI B 36.10 |
| Craft | Cold rolled and Cold drawn |
| ANSI Standard | B1.20. |
| Grades | ASTM A106 Grade A, Grade B, Grade C |
| Type | ERW / Seamless / Fabricated / Welded |
| Size | 1/2” NB to 36” NB |
| Length | Minimum 3 Meters, Maximum 18 Meters |
| Thickness | 3-12mm |
| Specialized in | Large Diameter ASTM A106 Grade B Pipe |
| Schedules | Schedule 20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH & heavier |
| ASME Standard | B36.10M |
| Tolerance | Cold drawn pipe: +/-0.1mmCold rolled pipe: +/-0.05mm |
| End | Plain End, Beveled End, Treaded |
Furthermore, appropriate heat treatment is applied to relieve internal stresses and enhance mechanical properties, ensuring exceptional high-temperature strength and overall reliability. ASTM A106 Gr.B pipes are widely used in critical industrial sectors including power plants, petrochemical facilities, refineries, boiler systems, and large-scale industrial pipeline networks. Their seamless structure provides distinct advantages in pressure containment and high-temperature performance, making them a preferred choice for rigorous applications .
Chemical Composition
The carbon content range of ASTM A106 Grade B pipe is 0.3%. Carbon is a key element that affects the strength and hardness of steel. Within this content range, ASTM A106 B material can achieve good strength while maintaining a certain toughness.
| 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.% | 0.1 | 0.1 | 0.1 |
| Chrome, max. % | 0.4 | 0.4 | 0.4 |
| Copper, max. % | 0.4 | 0.4 | 0.4 |
| Molybdenum, max. % | 0.15 | 0.15 | 0.15 |
| Nickel, max. % | 0.4 | 0.4 | 0.4 |
| Vanadium, max.% | 0.08 | 0.08 | 0.08 |
The minimum tensile strength of ASTM A106 Grade B pipe is 415 MPa. Tensile strength is the maximum stress that a material can withstand during stretching. The tensile strength of A106 B ensures that the material will not break easily when subjected to tensile loads.
Mechanical & Physical Properties
| Grade | Grade A | Grade B | Grade C | |||
| Tensile stength,min,psi | 48000 [330] | 60000 [415] | 70000 [485] | |||
| Yield strength,min,psi[MPa] | 30000 [205] | 35000 [240] | 40000 [275] | |||
| Direction | Longitudinal | Transverse | Longitudinal Transverse | Longitudinal Transverse | ||
| Elongation in 2 in.[50mm],min,% | ||||||
| Basic minimum elongation transverse strip tests,and for small sizes tested in full section | 35 | 25 | 30 | 16.5 | 30 | 16.5 |
When standard round 2-in [50-mm]gage length test specimen is used | 28 | 20 | 22 | 12 | 20 | 12 |
| For longitudinal strip tests | A | A | A | |||
| For transverse strip tests,a deduction for each 1/32-in. [0.8-mm]decrease in wall thickness below 5/16 in. [7.9 mm]from the basic minimum elongation of the following percentage shall be made | 1.25 | 1.00 | 1.00 | |||
Equivalent Material of ASTM A106 Gr.B Carbon Steel Pipes
| Former | New | |||
| Execution | Standard | Material | Standard | Material |
| Seamless | EN 10216-2 | P265GH | ASTM A106 | GRADE B |
ASTM A106 Gr.B Carbon Steel Pipe Thickness Schedule
| DN | NPS | OD | SCH20 | SCH30 | STD | SCH40 | SCH60 | XS | 80 |
| 6 | 1/8 | 10.3 | – | 1.45 | 1.73 | 1.73 | – | 2.41 | 2.41 |
| 8 | 1/4 | 13.7 | – | 1.85 | 2.24 | 2.24 | – | 3.02 | 3.02 |
| 10 | 3/8 | 17.1 | – | 1.85 | 2.31 | 2.31 | – | 3.20 | 3.20 |
| 15 | 1/2 | 21.3 | – | 2.41 | 2.77 | 2.77 | – | 3.73 | 3.73 |
| 20 | 3/4 | 26.7 | – | 2.41 | 2.87 | 2.87 | – | 3.91 | 3.91 |
| 25 | 1 | 33.4 | – | 2.90 | 3.38 | 3.38 | – | 4.55 | 4.55 |
| 32 | 11/4 | 42.2 | – | 2.97 | 3.56 | 3.56 | – | 4.85 | 4.85 |
| 40 | 11/2 | 48.3 | – | 3.18 | 3.68 | 3.68 | – | 5.08 | 5.08 |
| 50 | 2 | 60.3 | – | 3.18 | 3.91 | 3.91 | – | 5.54 | 5.54 |
| 65 | 21/2 | 73.0 | – | 4.78 | 5.16 | 5.16 | – | 7.01 | 7.01 |
| 80 | 3 | 88.9 | – | 4.78 | 5.49 | 5.49 | – | 7.62 | 7.62 |
| 90 | 31/2 | 101.6 | – | 4.78 | 5.74 | 5.74 | – | 8.08 | 8.08 |
| 100 | 4 | 114.3 | – | 4.78 | 6.02 | 6.02 | – | 8.56 | 8.56 |
Advantages of ASTM A106 Gr.B Pipe
High-temperature resistance ASTM A106 Grade B pipes are designed to withstand high temperatures, making them ideal for applications with elevated operating temperatures.
Superior Strength: These tubes have exceptional tensile and yield strengths, ensuring structural integrity and longevity, even in demanding conditions.
Corrosion Resistance: ASTM A106 Grade B pipes are resistant to corrosion, which enhances their durability and performance in corrosive environments.
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