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ASTM A672 C60 / C65 / C70 EFW Pipes Supplier & Stockist in India

High-pressure Electric Fusion Welded (EFW) steel pipes for moderate temperature service - Precision fabricated from pressure vessel quality plates.

ASTM A672 EFW Technical Overview

ASTM A672 is the standard specification for Electric-Fusion-Welded steel pipe for high-pressure service at moderate temperatures. These pipes are fabricated from several grades and classes of pressure vessel quality plate. The grades C60, C65, and C70 are manufactured using ASTM A516 carbon steel plates. While ASTM A671 is used for lower temperatures, ASTM A672 is the preferred choice for moderate temperature applications. Steel Emporium provides these pipes in various classes (e.g., Class 12, 22, 32), ensuring specific heat treatments and 100% radiographic testing as per project requirements.

Key Material Advantages

Pressure Resistance

Designed to withstand extreme internal pressures in industrial piping systems.

Large Size Range

Fabricated in diameters up to 100 inches, filling the gap where seamless pipes end.

Certified Quality

Mandatory testing including Radiography (RT) and Hydro-test for weld integrity.

Table 1: Chemical Composition (%)
Grade (Plate Base) C (max) Mn P (max) S (max) Si
C60 (A516 Gr 60) 0.21 - 0.25 0.60 - 1.20 0.035 0.035 0.15 - 0.40
C65 (A516 Gr 65) 0.24 - 0.28 0.85 - 1.20 0.035 0.035 0.15 - 0.40
C70 (A516 Gr 70) 0.27 - 0.30 0.85 - 1.20 0.035 0.035 0.15 - 0.40
Table 2: Mechanical Properties
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (% in 2")
C60 415 - 550 220 min 21% min
C65 450 - 585 240 min 19% min
C70 485 - 620 260 min 17% min
Table 3: Common A672 Classes & Heat Treatment
Class Heat Treatment on Pipe Section Radiography
Class 10 None (As-rolled) None
Class 11 None (As-rolled) Full Radiography
Class 12 None (As-rolled) Spot Radiography
Class 22 Stress Relieved (SR) Spot Radiography
Class 32 Normalized Spot Radiography
Class 42 Normalized & Tempered Spot Radiography
Table 4: International Equivalent Standards
ASTM ASME Plate Material EN Designation
A672 Grade C60 SA672 Grade C60 ASTM A516 Gr 60 EN 10217 P235GH
A672 Grade C70 SA672 Grade C70 ASTM A516 Gr 70 EN 10217 P265GH
Table 5: A672 EFW Pipe Weight Chart (Large Diameter)
Size (NB) OD (mm) STD Weight (kg/m) XS Weight (kg/m)
24" 609.6 125.49 173.40
30" 762.0 157.10 217.20
36" 914.4 188.71 261.00
42" 1066.8 220.32 304.81
48" 1219.2 251.93 348.62

Industrial Applications

Power Generation

High-pressure steam lines and power plant piping.

Refineries

Moderate temperature hydrocarbon process piping.

Chemical Plants

Pressure vessels and large diameter reactor piping.

Frequently Asked Questions

The primary difference is the Service Temperature. ASTM A671 is used for atmospheric and lower temperatures, while ASTM A672 is intended for high-pressure service at moderate temperatures.

Grade C70 is fabricated using ASTM A516 Grade 70 plates, which are pressure-vessel quality carbon steel plates known for high tensile strength.

It depends on the Class. For example, Class 11 and Class 21 require Full Radiography, while Class 12 and Class 22 require Spot Radiography.

The welding method is EFW (Electric Fusion Welding), typically performed using Longitudinally Submerged Arc Welding (LSAW) with filler metal added.

Because seamless pipes are extremely difficult and expensive to produce in very large diameters (above 24"). A672 offers a cost-effective solution for large NB pressure piping without compromising on safety or strength.
Quick Specification
Standard ASTM A672 / SA672
Grades C60, C65, C70
Class 12, 22, 32, 42
NB Sizes 16" to 100" NB
Manufacturing EFW (LSAW)
Inspection Radiography (RT)
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