ASTM A106 Grade B Pipe: Specifications, Sizes and Buying Guide

ASTM A106 Grade B pipe is a seamless carbon steel pipe for high-temperature service and is widely specified for process piping, refineries, petrochemical plants, power facilities, and other industrial applications. For buyers, the important details are not just “A106 Grade B” — the pipe size, wall thickness, length, testing, and documentation must also match the project requirements.

What Is ASTM A106 Grade B Pipe?

ASTM A106/A106M specifies seamless carbon steel pipe for high-temperature service. The standard covers NPS 1/8 through NPS 48, with nominal wall thicknesses generally based on ASME B36.10M. The pipe is suitable for welding, bending and flanging when the applicable requirements are met.

ASTM A106 Grade B is one of the most commonly specified grades within the A106 range.

It is often ordered as:

• ASTM A106 Grade B seamless pipe
• A106 Gr B seamless steel pipe
• A106 Grade B carbon steel pipe
• ASTM A106 Grade B Sch 40 pipe
• ASTM A106 Grade B Sch 80 pipe

For a quotation, “A106 Grade B pipe” alone is not enough. The supplier should receive the required NPS/OD, Schedule or wall thickness, length, quantity and testing requirements.

ASTM A106 Grade B Chemical Composition

The chemistry of A106 Grade B is controlled by the specification. Key limits include:

The specification also places a limit on the combined content of chromium, copper, molybdenum, nickel and vanadium.

For industrial purchasing, the actual heat analysis should be checked against the applicable material certificate rather than relying only on a supplier’s general product table.

ASTM A106 Grade B Mechanical Properties

For Grade B, the minimum mechanical properties are:

These values are important when an A106 Grade B pipe is being specified for pressure and elevated-temperature service.

For a bulk A106 Grade B seamless steel pipe order, buyers should also confirm the required mechanical tests and inspection requirements before production.

ASTM A106 Grade B Pipe Sizes and Schedules

A106 Grade B pipe can be supplied across a wide range of nominal pipe sizes. The A106 specification covers NPS 1/8 to NPS 48, while actual commercial availability can vary by supplier, manufacturing route and wall thickness.

Common purchasing requirements include:

• ASTM A106 Grade B Schedule 40 pipe
• ASTM A106 Grade B Schedule 80 pipe
• Schedule 10
• Schedule 160
• XS / Extra Strong
• XXS / Double Extra Strong

The Schedule should not be treated as a substitute for the actual wall thickness in a purchase order.

For stockists and distributors, a complete size schedule is especially useful when ordering mixed sizes for inventory.

Read the full case: 3,000 Tons ASTM A106 Seamless Carbon Steel Pipe Export to Chile

ASTM A106 Grade B Pipe vs ASTM A53 Grade B

These two specifications are often compared during purchasing, but they should not simply be treated as interchangeable.

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

ASTM A53 covers both seamless and welded pipe and has a broader general-purpose scope.

If the project specification specifically calls for ASTM A106 Grade B, replacing it with A53 Grade B should only be done after confirming that the applicable engineering and purchasing requirements permit the substitution.

ASTM A106 vs. ASTM A53: 5 Main Differences for Your Piping System

What Should Buyers Check Before Ordering A106 Grade B Pipe?

For overseas stockists, distributors and project suppliers, these are the details that most often cause problems after quotation:

1. Pipe size

Confirm NPS or outside diameter.

2. Wall thickness

Specify Schedule or exact wall thickness.

3. Length

Confirm whether the order requires fixed lengths, random lengths or a specific cut length.

4. Material certificate

Confirm the required MTC and heat/traceability information.

5. Testing

Clarify hydrostatic testing, NDT and any additional inspection requirements before production.

ASTM A106 includes requirements relating to mechanical testing and other examination requirements; the exact purchasing requirement should be confirmed against the applicable edition and order.

6. Quantity and delivery

A supplier that can quote a small quantity is not necessarily equipped for a large distributor order.

ASTM A106 Grade B Pipe for Stockists and Distributors

For an inventory distributor, the purchasing decision is different from a one-time project purchase.

You may need several sizes and schedules in the same shipment, followed by repeat orders based on local demand.

That makes the following points important:

• Consistent Grade B material
• Stable dimensions and wall thickness
• Complete MTC documentation
• Mixed-size order capability
• Reliable production planning
• Export packing and container loading
• Inspection before shipment
• Repeat-order support

A competitive unit price is useful, but specification consistency and delivery reliability directly affect your inventory business.

ASTM A106 Grade B Pipe Supplier for Bulk Orders-JS FITTINGS

JS FITTINGS supplies industrial carbon steel pipes together with butt weld pipe fittings and flanges, allowing distributors and project suppliers to source related piping components from one supply chain.

For an ASTM A106 Grade B seamless pipe quotation, send us your:

Size + Schedule/WT + Length + Quantity + Standard + Inspection requirement + Destination

For mixed-size or container orders, a detailed size list is preferred. It allows the quotation to be based on the actual material requirement instead of a generic A106 Grade B pipe price.

Need ASTM A106 Grade B pipe for stock or an industrial project? Send your pipe list to JS FITTINGS for a quotation.

Email: admin@jsfittings.com
Tel/WhatsApp: +8618003119682