ASTM A106 Grade B Seamless Carbon Steel Pressure Pipe
The trusted standard for transporting fluids and gases in extreme conditions. Engineered for high temperatures (up to 750°F) in refineries, power plants, and boilers.
A106 Grade B vs. A53 Grade B
They look identical, but chemically they are different. Choosing the wrong pipe for high-temperature service can lead to failure.
ASTM A53 Gr. B
General Purpose PipeASTM A106 Gr. B
High-Temp Service PipeThe Engineering Verdict
A106 can typically replace A53, but A53 cannot always replace A106. The silicon content in A106 ("Killed Steel") prevents graphitization at high temperatures, making it the only safe choice for pressure applications >400°F.
Engineered for Pressure
Meeting strict ASTM A106 / ASME SA106 requirements for mechanical strength and chemical stability.
Mechanical Properties
Grade B Standard(415 MPa)
(240 MPa)
Chemical Composition (Max %)
*Silicon content > 0.10% ensures the steel is fully deoxidized ("Killed"), preventing defects at high temperatures.
Built for Critical Environments
ASTM A106 Grade B is the default choice wherever fluids and gases are transported under high pressure and temperature.
Oil & Gas Refineries
Transporting crude oil, gasoline, and process fluids. The seamless structure ensures zero leaks in hazardous zones.
Flammable Fluids
Power Generation
Used in high-pressure steam lines and water feed systems where temperature fluctuations are constant.
High Temp Steam
Boiler Piping
Connects boiler components. Its killed steel composition resists graphitization better than standard carbon steel.
Heat Exchangers
Process Piping
General process lines in chemical plants requiring moderate corrosion resistance and high structural integrity.
High PressureStock Range & Schedules
We stock the hard-to-find heavy wall thicknesses. Understanding OD vs. Wall Thickness.
*Note: The Outside Diameter (OD) remains constant for all schedules of the same NPS size. Only the Inside Diameter (ID) gets smaller as the wall gets thicker.
| NPS Size Range | Schedules (Wall Thickness) | End Connections | Standard Lengths |
|---|---|---|---|
| 1/8" - 1-1/2" | SCH 40, SCH 80, SCH 160 | Plain (PE), Threaded | SRL (16-22 ft) |
| 2" - 6" |
SCH 40, SCH 80 In Stock SCH 160, XXS Heavy Wall |
Beveled (BE) for welding | DRL (35-44 ft) |
| 8" - 24" | STD, XS, SCH 40, SCH 80, SCH 100, SCH 120, SCH 160 | Beveled (BE) | DRL (35-44 ft) |
| 26" - 48" | STD, XS (Large Diameter) | Beveled (BE) | Cut-to-Length |
Verified Quality
We don't just sell pipe; we sell the documentation that proves its integrity.
Material: ASTM A106 Grade B
Heat No: H-49204-X
Product: Seamless Steel Pipe
Chemical: C:0.21 Mn:0.55 Si:0.18
Tensile: 72,500 PSI (PASS)
Hydro Test: 2500 PSI (PASS)
Hydrostatic Testing
Every single length of pipe is subjected to internal water pressure testing to detect potential leaks or weak points before leaving the mill.
Nondestructive Testing (NDT)
Ultrasonic or Eddy Current testing is performed to identify invisible internal flaws, cracks, or inclusions without damaging the pipe.
Flattening Test
Samples are flattened between parallel plates to ensure the steel can withstand deformation without cracking (Ductility check).
Technical FAQ
Engineering answers regarding temperature limits, welding, and surface treatment.
Can ASTM A106 Grade B pipe be galvanized?
Yes, absolutely. While A106 is typically supplied with a black lacquer or bare finish for high-temp service, it can be Hot-Dip Galvanized (HDG) per ASTM A123 specification. This is common for A106 pipes used in outdoor coastal refineries or offshore platforms to prevent exterior corrosion.
What is the maximum service temperature?
ASTM A106 Grade B is suitable for service up to approximately 750°F (400°C). Extended exposure above 800°F (425°C) can cause "graphitization," where the carbides in the steel break down, significantly weakening the pipe. For higher temperatures, Alloy Steel (ASTM A335 P11/P22) is required.
Is it difficult to weld A106 Grade B?
No, it has excellent weldability. It is typically welded using SMAW (Stick), GTAW (TIG), or GMAW (MIG). Common filler metals include E7018 electrodes. Pre-heating is generally not required for standard wall thicknesses (SCH 40/80) unless the ambient temperature is freezing.
Can this pipe be bent (Cold Bending)?
Yes. A106 Grade B has sufficient ductility for cold bending. For pipe diameters NPS 2 and larger, heat treatment (stress relieving) is recommended after bending if the bend radius is tight (less than 5x diameter) to maintain mechanical properties.
Red Zone: Danger of Graphitization. Switch to Chrome-Moly (ASTM A335).