Specification of ASTM A106 Gr.B Seamless Pipes

The specification of ASTM A106 Gr.B Seamless Pipe, including standards, size range, and length, is listed below.

Parameter Details
Standard ASTM A106 / ASME SA106
Manufacturing Type Seamless (Hot Finished / Cold Drawn)
Size Range 1/8” NB to 36” NB
Wall Thickness Sch 10 to Sch 160 / XXS
Length Single Random, Double Random, Cut Length
End Type Plain End (PE), Bevelled End (BE), Threaded
Surface Finish Black Painted, Varnished, Bare, Anti-Corrosion Coated
Test Certificates Mill Test Certificate (EN 10204 3.1 / 3.2)
Testing Hydrostatic Test, NDT (UT, RT), Mechanical & Chemical Testing

ASTM A106 Gr.B Seamless Pipe Dimensions and Schedules

ASTM A106 Grade B seamless pipes are commonly used in high‑temperature service because they are strong, come in many sizes, and allow for flexible design.

Parameter Specification
Product ASTM A106 Grade B Seamless Pipe
Size Range NPS 1/8" to NPS 48"
Standard ASME B36.10M
Schedule Range SCH 10 to SCH XXS (Double Extra Strong)
Wall Thickness Up to 5.500" (for heavy schedules in large diameters)

Pipe Schedule and Wall Thickness Chart

The table below lists common NPS sizes, along with wall thickness and weight per foot, for the most frequently ordered schedules of A106 Gr.B seamless pipe.

NPS (inches) OD (inches) SCH 40 WT (inches) SCH 40 Wt (lb/ft) SCH 80 WT (inches) SCH 80 Wt (lb/ft)
1/2 0.840 0.109 0.85 0.147 1.09
1 1.315 0.133 1.68 0.179 2.17
2 2.375 0.154 3.65 0.218 5.02
4 4.500 0.237 10.79 0.337 14.98
6 6.625 0.280 18.97 0.432 28.57
8 8.625 0.322 28.55 0.500 43.39
12 12.750 0.375 49.56 0.500 65.42
16 16.000 0.375 62.58 0.500 82.77

Pipe Lengths

Parameter Specification
Product ASTM A106 Grade B Seamless Pipe
Standard Lengths Single Random: 17 to 24 feet
Double Random: 36 to 44 feet
Custom Lengths Fixed or cut lengths available on request
Order Condition Subject to minimum order quantities (MOQ)
Buyer Requirement Lengths must be specified at the enquiry stage for non-standard orders
Lead Time Note Additional lead time may apply for non-standard length requirements

Permissible Tolerances for ASTM A106 Pipe

ASTM A106 sets tolerance limits for outside diameter, wall thickness, and weight. These tolerances align with industry practice and are consistent with ASTM A53 tolerance requirements.

Outside Diameter Tolerances

The table below explains permissible outside diameter tolerances for pipes across different NPS size ranges, based on applicable industry standards.

Pipe Size Range OD Tolerance Notes
NPS 1/2 and under ± 0.4 mm (1/64 inch) Fixed tolerance
NPS 2 to NPS 12 ± 1% of Outside Diameter (OD) Percentage-based tolerance
Above NPS 12 ± 0.75% of Outside Diameter (OD) As per ASME B36.10M with specific limits

Wall Thickness Tolerances

This section explains how much the wall thickness is allowed to vary, setting minimum limits while still allowing extra thickness as long as the total weight stays within the allowed range.

Parameter Requirement
Minimum Wall Thickness Shall not be more than 12.5% below the nominal wall thickness
Maximum Wall Thickness Not specifically defined by the standard
Thickness Above Nominal Permitted, subject to overall weight tolerance limits

Weight Tolerances

Weight tolerances differ depending on the type of shipment, and procurement teams need to consider these limits to carry out accurate inspections and maintain compliance.

Category Weight Tolerance Description
Individual Lengths +10% / -3.5% Based on the calculated weight per foot for each pipe length
Carload / Truckload Lots +10% / -1.75% Tighter tolerance applied to bulk shipments
Inspection Guidance — Procurement teams should account for these tolerances during receiving checks

ASTM A106 Gr.B Seamless Pipe Price

ASTM A106 Gr.B seamless pipe pricing depends on several factors: NPS size, wall thickness or schedule, length, order quantity, surface finish (bare or galvanised), and any additional testing or certification requirements. The price of this grade is ₹72 to ₹95 per kg in India and $0.78 to $1.15 USD. Market rates for carbon steel pipe fluctuate with raw material costs, steel index pricing, and global demand cycles. Larger diameters and thicker schedules cost more per foot because they use more steel. We offer competitive prices on all sizes and give volume discounts on bulk orders. Contact our sales team with your required size, schedule, and quantity for a current quote.

Chemical Composition of ASTM A106 Grade B Seamless Pipe

The chemical composition of ASTM A106 Grade B seamless pipe, along with its proportion, is listed below:

Carbon C
Max 0.30%
Manganese Mn
0.29% to 1.06%
Phosphorus P
Max 0.035%
Sulphur S
Max 0.035%
Silicon Si
Min 0.10%
Chromium Cr
Max 0.40%
Copper Cu
Max 0.40%
Molybdenum Mo
Max 0.15%
Nickel Ni
Max 0.40%
Vanadium V
Max 0.08%
Cr+Cu+Mo+Ni+V
Max 1.00%

Mechanical Properties of ASTM A106 Grade B Pipe

The mechanical properties of ASTM A106 Grade B seamless pipe, including tensile, yield, and elongation requirements, are listed below.

415
MPa
Tensile Strength
240
MPa
Yield Strength
16.5%
(strip specimen) min
Elongation
30%
(round specimen) min
Elongation
Property Grade B
Tensile Strength, min 60,000 psi (415 MPa)
Yield Strength, min 35,000 psi (240 MPa)
Elongation (strip specimen), min 16.5%
Elongation (round specimen), min 30%
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Equivalent Designation of ASTM A106 Grade B Seamless Pipe

International designation equivalent to ASTM A106 Grade B Seamless Pipe, including UNS and Werkstoff Nr., is listed below.

Standard System Equivalent Grade
UNS K03006
EN P265GH
Werkstoff Nr (DIN) 1.0425
JIS STPG 370
GB (China) 20#
AFNOR TU42C
GOST 20

ASTM A106 Gr.B Seamless Pipe Industrial Applications

ASTM A106 Grade B seamless pipe serves industries that require reliable fluid and gas transport at elevated temperatures and pressures.

Oil & Gas Refineries

A106 Gr.B seamless pipe carries process fluids through distillation units, heat exchangers, and furnace piping systems in refinery operations.

Power Plants & Boilers

Boiler systems use this grade of pipe for superheated steam lines and high-pressure feedwater lines.

Petrochemical Plants

Petrochemical plants use A106 Grade B pipe in process lines that carry pressurised hydrocarbons and chemical intermediates.

Shipbuilding

This pipe grade is chosen by marine engineers for shipboard high-pressure steam and hydraulic piping systems.

Comparison of Grades A, B, and C

This table compares ASTM A106 Grades A, B, and C by strength, ductility, and typical piping uses.

Property ASTM A106 Grade A ASTM A106 Grade B ASTM A106 Grade C
Minimum Tensile Strength 48,000 psi (330 MPa) 60,000 psi (415 MPa) 70,000 psi (485 MPa)
Minimum Yield Strength 30,000 psi (205 MPa) 35,000 psi (240 MPa) 40,000 psi (275 MPa)
Elongation Highest Moderate Lowest
Ductility Excellent Good Lower
Formability Best for cold forming & coiling Good balance Limited
Weldability Excellent Very good Good
Pressure Handling Lowest Medium Highest
Typical Applications Low-pressure, structural, bending applications General-purpose high-temperature piping High-pressure, high-temperature service
Cost Lowest Moderate Highest

ASTM A106 Grade B vs ASTM A53 Grade B vs API 5L Grade B

Buyers frequently compare these three Grade B specifications. The table below clarifies the key differences.

Feature ASTM A106 Gr.B ASTM A53 Gr.B API 5L Gr.B PSL1
Pipe Type Seamless only Seamless and welded Seamless and welded
Primary Service High-temperature pressure General-purpose structural and pressure Oil and gas line pipe transmission
Max Carbon (%) 0.30 0.30 0.28
Min Tensile (psi) 60,000 60,000 60,200
Min Yield (psi) 35,000 35,000 35,500
Heat Treatment Required Cold-drawn: yes; Hot-finished: no Varies by type Varies by PSL

ASTM A106 Gr.B is the correct specification when a project demands seamless-only pipe rated for continuous high-temperature pressure service. ASTM A53 suits general-purpose applications where welded pipe is acceptable. API 5L Gr.B is intended for oil and gas pipeline transmission.

Heat Treatment

Hot-finished pipe doesn't require mandatory heat treatment under the specification. Cold-drawn pipe, on the other hand, must undergo normalising at approximately 900 degrees C (1,650 degrees F) after the final cold draw pass. This normalising step restores the grain structure and relieves residual stresses introduced during cold working.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect ASTM a106 grade b pipes from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies carbon steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

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Frequently Asked Questions

What is ASTM A106 Grade B Seamless Pipe? +
ASTM A106 Grade B is a seamless carbon steel pipe used for high‑temperature applications. It covers sizes from NPS 1/8" to 48". The pipe must have at least 60,000 psi (415 MPa) tensile strength and 35,000 psi (240 MPa) yield strength. It is made from fully deoxidised (killed) steel and can be easily bent, flanged, and welded.
What are the dimensions available for ASTM A106 Gr.B Seamless Pipe? +
ASTM A106 Grade B seamless pipe comes in sizes from 1/8" to 48" (NPS) with standard wall thicknesses defined by ASME B36.10M, and is available in schedules from SCH 10 up to SCH XXS (Double Extra Strong).
What is the chemical composition of ASTM A106 Grade B Pipe? +
ASTM A106 Grade B pipe has a maximum of 0.30% carbon, 0.29% to 1.06% manganese, a maximum of 0.035% phosphorus, and a maximum of 0.035% sulphur. Silicon has a minimum of 0.10%, and the combined total of Cr+Cu+Mo+Ni+V is not more than 1.00%.
What is the difference between ASTM A106 and ASME SA-106? +
ASME SA-106 adopts ASTM A106 with an SA- prefix for boiler and pressure vessel code work. The specifications are nearly identical, though ASME SA-106 limits maximum manganese to 1.35% versus ASTM A106's allowance up to 1.65% for Grade B when carbon reduction trade-offs apply.
What is the difference between ASTM A106 Grade B and ASTM A53 Grade B Pipe? +
A106 Gr.B is seamless-only for high-temperature pressure service. A53 Gr.B covers both seamless and welded pipe for general structural and pressure applications at lower temperatures. Chemistry overlaps between the two, but the intended service conditions and pipe types differ.
What is the wall thickness tolerance for ASTM A106 Pipe? +
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified per ASTM A106. There is no upper tolerance on wall thickness, provided the pipe stays within weight tolerance limits.
Can ASTM A106 Gr.B Pipe be used for welding? +
Yes. Pipe ordered under ASTM A106 is suitable for bending, flanging, and similar forming operations, and for welding. A suitable welding procedure must be followed, and buyers can request supplementary requirements for specific welding qualifications.
What lengths are available for ASTM A106 Grade B Pipe? +
ASTM A106 Grade B pipe ships in single random lengths of 17 to 24 feet and double random lengths of 36 to 44 feet. Fixed and cut lengths are available on request.

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