ASTM A106Gr.C Seamless Pipe Specification

Refer to the following table for the technical specifications and dimensional availability of ASTM A106 Grade C Seamless Pipes, the industry standard for high-strength carbon steel pipe in high-temperature service.

Property Specification / Details
Standard ASTM A106 / ASME SA106
Size Range (NPS) 1/8" NPS to 48" NPS
Schedule (Wall Thickness) SCH 10, 20, 30, 40, STD, 60, 80, XH, 100, 120, 140, 160, XXH
Manufacturing Type Seamless (Hot Finished or Cold Drawn)
Length Single Random, Double Random, or Cut-to-length (up to 12m)
End Connections Plain End, Beveled End, Threaded & Coupled
Surface Coating Black Paint, Anti-corrosion Oil, Galvanized, 3LPE, FBE

ASTM A106 Gr.C Seamless Pipe Dimensions and Schedules

The following table shows the sizes of ASTM A106 Grade C Seamless Pipes, which are the industry standard for high-strength carbon steel pipes that can handle high temperatures.

Pipe Schedule and Wall Thickness Chart

The table below lists OD and wall thickness for common NPS sizes.

NPS OD (in.) SCH 40 WT (in.) SCH 80 WT (in.) SCH 160 WT (in.)
1/2" 0.840 0.109 0.147 0.187
2" 2.375 0.154 0.218 0.344
4" 4.500 0.237 0.337 0.531
8" 8.625 0.322 0.500 0.906

Outside Diameter Tolerances

The following technical reference guide outlines the specific length standards and dimensional tolerances required for ASTM A106 Grade C Seamless Pipes.

ASTM A106 Grade C Dimensional & Tolerance Specifications

The table below lists OD and wall thickness for common NPS sizes.

Property Specification / Tolerance Details
Single Random Length (SRL) 17 feet to 24 feet (approx. 5.2m – 7.3m)
Double Random Length (DRL) 36 feet to 44 feet (approx. 11m – 13.5m)
Custom Lengths Precision cut-to-length available upon request
OD Tolerance (NPS ≤ 1-1/2") ± 0.4 mm (1/64 inch)
OD Tolerance (NPS > 1-1/2") ± 1% of the specified outside diameter
Wall Thickness Tolerance Minimum wall must not be less than 87.5% of nominal
Manufacturing Process Seamless Hot Finished or Cold Drawn

ASTM A106 Gr.C Seamless Pipes Price

Prices for ASTM A106 Grade C (UNS K03501) average $0.95–$1.15/kg in the US and ₹80–₹120/kg in India. Costs vary by NPS size, schedule, and testing needs. Due to limited availability, Grade C commands a premium over Grade B. Grade C costs a little more than ASTM A106 Grade B pipe because of limited availability in the market. Please get in touch with us with your requirements for a competitive quote.

Chemical Composition of ASTM A106 Grade C Seamless Pipe

Refer to the following table for the detailed chemical composition and elemental limits required for ASTM A106 Grade C pipes.

Carbon C
Max 0.35%
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%

Mechanical Properties of ASTM A106 Grade C Pipe

Refer to the table below for the mechanical parameters of ASTM A106 Grade C.

ASTM A106 Grade C pipe requires a minimum tensile strength of 70,000 psi (485 MPa), a minimum yield of 40,000 psi (275 MPa), and a minimum elongation of 30%. Engineers specify Grade C when design calculations demand stresses that Grade B cannot satisfy.

485
MPa
Tensile Strength
275
MPa
Yield Strength
30%
min
Elongation
Property Grade C
Tensile Strength, min 70,000 psi (485 MPa)
Yield Strength, min 40,000 psi (275 MPa)
Elongation, min 30%
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Equivalent Designation of ASTM A106 Gr.C Seamless Pipes

The following shows the detailed equivalent designations for ASTM A106 Gr.C Seamless Pipes across the globe to help buyers to recognise the alloy.

Property Specification / Details
Standard ASTM A106 / ASME SA106
Grade Grade C (High Strength Carbon Steel)
Process Seamless (Hot Finished or Cold Drawn from Killed Steel)
Heat Treatment Hot Finished (None); Cold Drawn (Normalised)
Melting Open-hearth, basic-oxygen, or electric-furnace
Size Range 1/8" NPS to 48" NPS

ASTM A106 Gr.C Seamless Pipe Applications

ASTM A106 Grade C seamless pipe serves high-pressure, high-temperature applications where Grade B's strength is insufficient. 3 primary sectors use this grade.

High-Pressure Power Generation

A106 Grade C pipe is specified for superheater lines, steam headers, and boiler piping above 450 °C.

Oil and Gas Refineries

Refinery process piping uses Grade C for wall thickness reduction at elevated temperatures without sacrificing pressure rating.

Petrochemical Plants

SA-106 Grade C pipe handles reactor feed lines and transfer piping where thermal cycling demands higher yield margins.

ASTM A106 Grade C vs Grade B:

Grade C provides a minimum tensile strength of 70,000 psi versus Grade B's 60,000 psi and a minimum yield of 40,000 psi versus 35,000 psi.

Specify Grade C when elevated-temperature design calculations require a higher allowable stress. Preheat and post-weld heat treatment may be required depending on wall thickness, carbon equivalent, and service conditions.

Property Grade B Grade C
Tensile Strength, min 60,000 psi (415 MPa) 70,000 psi (485 MPa)
Yield Strength, min 35,000 psi (240 MPa) 40,000 psi (275 MPa)
Carbon, max % 0.30 0.35

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 c seamless 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 C Seamless Pipe? +
ASTM A106 Grade C is the highest-strength grade in the A106 specification. It requires a minimum tensile strength of 70,000 psi (485 MPa) and a minimum yield of 40,000 psi (275 MPa).
What is the difference between ASTM A106 Grade C and Grade B Pipe? +
Grade C requires 70,000 psi tensile versus 60,000 psi for Grade B and 40,000 psi yield versus 35,000 psi. Grade C also permits higher carbon at 0.35% max. Grade C is specified only when design calculations confirm Grade B's strength is insufficient.
What sizes are available for ASTM A106 Gr.C Seamless Pipe? +
ASTM A106 covers NPS 1/8" to NPS 48" per ASME B36.10M, SCH 10 through XXS.
What is the difference between ASTM A106 and ASME SA-106? +
ASME SA-106 adopts ASTM A106 with an "SA-" prefix for ASME Boiler and Pressure Vessel Code use.
Can ASTM A106 Gr.C Pipe be welded? +
Yes, but Grade C's higher carbon (0.35% max) requires preheat and post-weld heat treatment to prevent cracking.
What is the wall thickness tolerance for ASTM A106 Gr.C Pipe? +
Minimum wall shall not be more than 12.5% under the nominal wall thickness. This applies to all A106 grades.
What lengths are available for ASTM A106 Grade C Pipe? +
Single random lengths run 17 to 24 feet; double random lengths run 36 to 44 feet.
Where can I buy ASTM A106 Gr.C Seamless Pipe? +
Sachiya Steel International is a certified manufacturer and supplier with mill test certificates per EN 10204 3.1/3.2. Contact us for stock availability.

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