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ASTM A671 CC60 / CC65 / CC70 EFW Pipes

High-integrity Electric Fusion Welded (EFW) Carbon Steel pipes fabricated from pressure vessel quality plate for atmospheric and lower temperatures.

ASTM A671 EFW Technical Overview

ASTM A671 is the standard specification for Electric-Fusion-Welded (EFW) steel pipe with filler metal added, fabricated from pressure vessel quality plate. These pipes are intended for use at atmospheric and lower temperatures in high-pressure applications. The grades CC60, CC65, and CC70 refer to the type of carbon steel plate used (specifically ASTM A516 Grade 60, 65, and 70). At Steel Emporium, we supply A671 pipes in various Classes (10 to 73), which determine the level of heat treatment and radiographic examination performed to ensure weld integrity. These pipes are a reliable choice for large-diameter oil, gas, and water transport lines.

Key Material Advantages

100% X-Ray Possible

Welds can be fully radiographed (RT) to ensure zero defects in high-pressure service.

Large Diameters

Ideally suited for large NB sizes (16" to 100") where seamless pipes are unavailable.

Plate Quality

Made from high-quality A516 kiln-killed plates for superior pressure resistance.

Table 1: Chemical Composition (%)
Grade (Plate)C (max)MnP (max)S (max)Si
CC60 (A516 Gr 60)0.21 - 0.250.60 - 1.200.0350.0350.15 - 0.40
CC65 (A516 Gr 65)0.24 - 0.280.85 - 1.200.0350.0350.15 - 0.40
CC70 (A516 Gr 70)0.27 - 0.300.85 - 1.200.0350.0350.15 - 0.40
Table 2: Mechanical Properties
GradeTensile Strength (MPa)Yield Strength (MPa)Elongation (% in 2")
CC 60415 - 550220 min21% min
CC 65450 - 585240 min19% min
CC 70485 - 620260 min17% min
Table 3: Common A671 Classes Explained
ClassHeat TreatmentRadiography (X-Ray)
Class 10None (As-rolled)None
Class 11None (As-rolled)Full Radiography
Class 12None (As-rolled)Spot Radiography
Class 21Stress Relieved (SR)Full Radiography
Class 22Stress Relieved (SR)Spot Radiography
Class 31NormalizedFull Radiography
Table 4: A671 EFW Pipe Weight Chart (Large NB)
Size (NB)OD (mm)STD Weight (kg/m)XS Weight (kg/m)
16"406.483.5114.7
20"508.0104.5144.1
24"609.6125.5173.4
36"914.4188.5261.4
48"1219.2251.5349.4

Industrial Applications

Petrochemical

Low-temperature pressure piping in refineries.

Water Mains

Large NB water supply and distribution lines.

Oil & Gas

High-volume cross-country crude oil pipelines.

Frequently Asked Questions

EFW stands for Electric Fusion Welded. It refers to a welding process where the pipe is formed by rolling a plate and welding the seam using electric heat, often with the addition of filler metal.

The numbers refer to the Minimum Tensile Strength (in ksi) of the plate. CC70 (70ksi) is the strongest among the three, followed by CC65 and CC60.

Classes designate the Heat Treatment (none, stress relieved, normalized) and Radiographic Examination (none, spot, or full). This allows the buyer to choose the integrity level based on their application.

Yes, since it is made from ASTM A516 plates (which are kiln-killed and fine-grain), A671 pipes are highly suitable for low-temperature and atmospheric pressure services.

Absolutely. We specialize in large NB sizes (up to 100") in all A671 grades and classes, complete with MTC and ultrasonic/radiographic testing as required.
Quick Specification
StandardASTM A671 / SA671
GradeCC60 / CC65 / CC70
Common ClassClass 10, 11, 22
NB Sizes16" to 100" NB
ManufacturingEFW (LSAW)
Traceability100% RT Available
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