A672 Pipe designation covers electric-fusion-welded steel pipe with filler metal integrated, fabricated from pressure vessel quality plate of several analyses and vigor levels and opportune for high-pressure accommodation at atmospheric and lower temperatures.
Albeit according to the designation, the analysis of each mill heat of plate material utilized in the manufacture of these ASTM A672 EFW Pipes needs to be conducted. In integration to the fore mentioned analysis of the A672 Material, the analysis of the culminated deposited weld material on the ASTM A672 EFW Pipes must be conducted from either of the two areas i.e. – every 500 ft. or fraction there of of the A672 ASTM Welded pipe is to be made.
ASTM A671 EFW Pipes and ASTM A672 EFW Pipes (Electric-Fusion Welded) Carbon Steel Pipes used for atmospheric and lower temperatures applications (A671) and high-pressure service at moderate temperatures (A672).

As mentioned above, ASTM A671 EFW Pipes is used for atmospheric and lower temperature applications and ASTM A672 EFW Pipes is used for high pressure service applications at moderate temperature. However, if we compare the details e.g. A672 Gr.C60 & A671 Gr. CC60; the raw material plate used is the same for both pipes & the final mechanical properties are the same. Heat treatment is the same. The only difference between the 2 grades is only in the testing requirements. ASTM A672 EFW Pipes requires a weld sample drawn from a 500ft length of pipe and allows you to double the samples in case, the original sample fails. ASTM A671 EFW Pipes requires a weld sample drawn from a 200ft length of pipe with no provision for the rejected weld.

Understanding difference in different grades:

We come across different grades amongst A671 and A672 categories like CA/CB/CC (signified the type of plate used) and also difference classes like CL 12/22/32 etc. We will attempt to explain these differences with the below table with simplified classification.

The above classification should simplify any confusion with respect to different grades and classification. Apart from these there are other classes like CL 10, CL13 and C42. The differences in due to Radiography and Test Pressure, for eh CL 10 does not need radiography as well as pressure test, CL 13 does not need radiography but required Test Pressure, CL 42 needs the plate to be normalized as well as tempered with Radiography Testing and Test Pressure.

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