ASTM A106 Gr.B Seamless Carbon Steel Pipe

ASTM A106 Gr.B Seamless Carbon Steel Pipe is a widely used carbon steel pipe designed for high-temperature and high-pressure service. Manufactured without a weld seam, it provides reliable strength, dimensional consistency, and pressure performance for demanding industrial piping systems.

ASTM A106 Gr.B Seamless Carbon Steel Pipe is commonly used for conveying water, oil, gas, steam, and other process fluids in oil and gas facilities, refineries, petrochemical plants, power generation, boilers, chemical processing, and other industrial applications.

ASTM A106 Gr.B is one of the most commonly specified grades within ASTM A106 and offers a practical combination of strength, weldability, machinability, and cost efficiency.

 

 

ASTM A106 Gr.B seamless carbon steel pipe is manufactured for high-temperature service and is commonly specified for process piping, steam lines, boilers, refineries, petrochemical plants and power-generation systems. The pipe is supplied in different outside diameters and wall thicknesses according to the applicable dimensional standard and project requirements.

The nominal wall thickness can be selected by pipe size and schedule, while the actual minimum wall thickness is controlled according to the applicable ASTM requirements. For projects requiring specific pressure, temperature or corrosion allowances, the required outside diameter, nominal wall thickness or schedule should be confirmed before ordering.

 

 

 Seamless Construction: No longitudinal weld seam, providing reliable performance in pressure and temperature cycling applications.

 High-Temperature Service: Designed for elevated-temperature piping and commonly used in systems operating at demanding temperatures and pressures.

 Reliable Mechanical Strength: Grade B provides a minimum tensile strength of 415 MPa and minimum yield strength of 240 MPa.

 Good Fabrication Performance: Suitable for welding, machining, bending, flanging, and other standard fabrication processes when properly specified.

 Wide Size Availability: Available in various outside diameters, wall thicknesses, schedules, and lengths to meet different piping requirements.

 Broad Industrial Application: Suitable for oil and gas, power generation, petrochemical, chemical processing, boiler, marine, and general industrial piping systems.

 

ASTM A106 Gr.B Specifications

Item	Specification
Product Name	ASTM A106 Gr.B Seamless Carbon Steel Pipe
Standard	ASTM A106 / ASME SA106
Grade	Grade B
Material	Carbon Steel
Manufacturing	Seamless
Size	NPS 1/4" to 36" commonly available; larger sizes may be available by inquiry
Schedule	SCH 20 to XXH, depending on size
Length	Random length or customized length
End Type	Plain End, Beveled End, Threaded End
Surface	Black, Bare, or according to customer requirements
Application	High-temperature and pressure service
Related Dimension Standard	ASME B36.10M

 

Chemical Composition

Element	Grade B Requirement
Carbon (C)	≤ 0.30%
Manganese (Mn)	0.29–1.06%*
Phosphorus (P)	≤ 0.035%
Sulfur (S)	≤ 0.035%
Silicon (Si)	≥ 0.10%
Chromium (Cr)	≤ 0.40%
Copper (Cu)	≤ 0.40%
Molybdenum (Mo)	≤ 0.15%
Nickel (Ni)	≤ 0.40%
Vanadium (V)	≤ 0.08%

 

Mechanical Properties

Property	ASTM A106 Gr.B
Tensile Strength, Min.	60,000 psi / 415 MPa
Yield Strength, Min.	35,000 psi / 240 MPa
Elongation	According to ASTM A106 requirements

 

 

ASTM A106 Gr.B pipe is manufactured as a seamless carbon steel pipe. Depending on size and production requirements, seamless pipe may be produced through hot working and subsequent processing, or through cold drawing/finishing for specific dimensions.

Typical production steps include:

Steel Billet → Heating → Piercing → Hot Rolling → Sizing → Heat Treatment → Straightening → Surface Inspection → Dimensional Inspection → Testing → Marking → Packing

The seamless construction eliminates a longitudinal weld seam and is one of the main reasons A106 Gr.B is widely selected for demanding pressure and temperature service.

 

 

ASTM A106 Gr.B is frequently compared with ASTM A53 Gr.B and API 5L Gr.B because of similarities in chemical composition and mechanical properties. However, material selection should be based on the applicable design code, service conditions, temperature, pressure, manufacturing requirements, and project specifications rather than treating these standards as universally interchangeable.

 

 

Quality control for ASTM A106 Gr.B pipe should cover material verification, chemical composition, mechanical properties, dimensional inspection, surface condition, and applicable nondestructive or supplementary testing required by the purchase specification.

Relevant testing and inspection requirements may reference ASTM A530 and other applicable standards. Depending on the project, additional ultrasonic, eddy-current, hydrostatic, or other examinations may be specified.

 

We can supply ASTM A106 Gr.B seamless carbon steel pipe in different sizes, wall thicknesses, schedules, lengths, and end configurations according to project requirements.

 

Available options include:

Standard and customized dimensions

Different pipe schedules

Random or fixed lengths

Plain or beveled ends

Customized marking

Export packaging

Inspection and material documentation

 

For large-diameter, heavy-wall, or project-specific A106 Gr.B pipe requirements, please provide the required OD/NPS, wall thickness or schedule, length, quantity, end type, and applicable standard for quotation.

 

 

 

What is ASTM A106 Gr.B?

ASTM A106 Gr.B is a grade of seamless carbon steel pipe specified for high-temperature service. It is widely used in industrial piping systems for transporting fluids such as water, oil, gas, and steam.

Is ASTM A106 Gr.B seamless?

Yes. ASTM A106 is primarily a specification for seamless carbon steel pipe for high-temperature service.

What is the difference between ASTM A106 and ASME SA106?

ASTM A106 and ASME SA106 refer to closely related seamless carbon steel pipe specifications. SA106 is the ASME designation used within ASME code applications, while A106 is the ASTM designation.

What is the minimum tensile strength of A106 Gr.B?

ASTM A106 Gr.B has a minimum tensile strength of 60,000 psi (415 MPa) and a minimum yield strength of 35,000 psi (240 MPa).

What is ASTM A106 Gr.B used for?

It is commonly used for high-temperature and pressure piping in oil and gas, refineries, petrochemical plants, power plants, boilers, chemical processing, marine systems, and other industrial facilities.

What sizes are available?

A106 pipe is available across a broad range of nominal pipe sizes. Common commercial supply ranges include NPS 1/4" to 36", with availability depending on manufacturer, wall thickness, schedule, and project requirements.

 

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