Difference Between A671 and A672 EFW Pipes

A671 and A672 areEFW (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, A671 is used for atmospheric and lower temperature application and A672 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 same for both pipes & final mechanical properties are same. Heat treatment is same. The only difference between the 2 grades is only in the testing requirements. A672 requires weld sample drawn from a 500ft length of pipe and allows you to double the samples in case, original sample fails. A671 requires weld sample drawn from a 200ft length of pipe with no provision for a 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 different classes like CL 12/22/32 etc. We will attempt to explain these differences in the below table with simplified classification.

EFW Pipe Grade Plate Used Plate Grade Heat Treatment
ASTM A671 GR. CA45 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE A None
ASTM A671 GR. CA50 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE B None
ASTM A671 GR. CA55 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE C None
ASTM A671 GR. CB55 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 55 None
ASTM A671 GR. CB60 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 60 None
ASTM A671 GR. CB65 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 65 None
ASTM A671 GR. CB70 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 70 None
ASTM A671 GR. CC55 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 None
ASTM A671 GR. CC60 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 None
ASTM A671 GR. CC65 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 None
ASTM A671 GR. CC70 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 None
ASTM A671 GR. CA45 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE A Stress Relieved
ASTM A671 GR. CA50 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE B Stress Relieved
ASTM A671 GR. CA55 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE C Stress Relieved
ASTM A671 GR. CB55 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 55 Stress Relieved
ASTM A671 GR. CB60 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 60 Stress Relieved
ASTM A671 GR. CB65 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 65 Stress Relieved
ASTM A671 GR. CB70 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 70 Stress Relieved
ASTM A671 GR. CC55 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Stress Relieved
ASTM A671 GR. CC60 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Stress Relieved
ASTM A671 GR. CC65 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Stress Relieved
ASTM A671 GR. CC70 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Stress Relieved
ASTM A671 GR. CA45 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE A Normalized
ASTM A671 GR. CA50 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE B Normalized
ASTM A671 GR. CA55 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE C Normalized
ASTM A671 GR. CB55 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 55 Normalized
ASTM A671 GR. CB60 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 60 Normalized
ASTM A671 GR. CB65 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 65 Normalized
ASTM A671 GR. CB70 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 70 Normalized
ASTM A671 GR. CC55 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Normalized
ASTM A671 GR. CC60 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Normalized
ASTM A671 GR. CC65 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Normalized
ASTM A671 GR. CC70 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Normalized
ASTM A672 GR. CA45 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE A None
ASTM A672 GR. CA50 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE B None
ASTM A672 GR. CA55 EFW pipes CL12 Plain Carbon A 285/A 285M GRADE C None
ASTM A672 GR. CB55 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 55 None
ASTM A672 GR. CB60 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 60 None
ASTM A672 GR. CB65 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 65 None
ASTM A672 GR. CB70 EFW pipes CL12 Plain Carbon, Killed A515/A515M GRADE 70 None
ASTM A672 GR. CC55 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 None
ASTM A672 GR. CC60 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 None
ASTM A672 GR. CC65 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 None
ASTM A672 GR. CC70 EFW pipes CL12 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 None
ASTM A672 GR. CA45 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE A Stress Relieved
ASTM A672 GR. CA50 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE B Stress Relieved
ASTM A672 GR. CA55 EFW pipes CL22 Plain Carbon A 285/A 285M GRADE C Stress Relieved
ASTM A672 GR. CB55 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 55 Stress Relieved
ASTM A672 GR. CB60 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 60 Stress Relieved
ASTM A672 GR. CB65 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 65 Stress Relieved
ASTM A672 GR. CB70 EFW pipes CL22 Plain Carbon, Killed A515/A515M GRADE 70 Stress Relieved
ASTM A672 GR. CC55 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Stress Relieved
ASTM A672 GR. CC60 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Stress Relieved
ASTM A672 GR. CC65 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Stress Relieved
ASTM A672 GR. CC70 EFW pipes CL22 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Stress Relieved
ASTM A672 GR. CA45 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE A Normalized
ASTM A672 GR. CA50 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE B Normalized
ASTM A672 GR. CA55 EFW pipes CL32 Plain Carbon A 285/A 285M GRADE C Normalized
ASTM A672 GR. CB55 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 55 Normalized
ASTM A672 GR. CB60 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 60 Normalized
ASTM A672 GR. CB65 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 65 Normalized
ASTM A672 GR. CB70 EFW pipes CL32 Plain Carbon, Killed A515/A515M GRADE 70 Normalized
ASTM A672 GR. CC55 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 55 Normalized
ASTM A672 GR. CC60 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 60 Normalized
ASTM A672 GR. CC65 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 65 Normalized
ASTM A672 GR. CC70 EFW pipes CL32 Plain Carbon, Killed, Fine Grained A516/A516M GRADE 70 Normalized

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 the 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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EN 10204 3.1 Certification Vs EN 10204 3.2 Certification

Difference between EN 10204 3.1 Certification Vs EN 10204 3.2 Certification

In this world of constantly revamping construction facilities and new age technology taking over to change the face of infrastructure to favor durability, sustainability and quality, the materials that make up the bare skeleton of any structure, are of utmost importance. There is an ever increasing demand for carbon steel and API 5L pipes and Rexal tubes is the ultimate go-to option to cater to your needs. This 15 year old company provides a large range of products like carbon steel, alloy steel, stainless steel, flanges, fittings, nickel pipes & tubes, ISO 3183 pipes, and a huge variety of API 5L pipes.

Rexal tubes advocate quality certification issued by authorized European bodies and Mill Test Certification to a large extent and hence, ensure that their products diligently undergo these standard specifications testing which are highly stringent and qualify the same seamlessly. EN10204 is a Euronorm generated by the European community that is an umbrella certification inclusive of a large number of specific material test reports and certification and consists of 4 document type, 2.1, 2.2, 3.1 and 3.2. EN 10204 3.1 certification & EN 10204 3.2 certification involves tests undertaken by more than just the manufacturer.

The EN 10204 3.1 certification is the type wherein the specific authorized inspection is undertaken by a laboratory and representative from the manufacturer but is independent of the manufacturing department since it is a second source inspection and an additional one from the standard quality tests performed at the mill. The Mill Test certification only includes the name of the manufacturer.

EN 10204 3.2 certification is twice as stringent and the much more expensive certification option due to factors like it involves specific authorized inspection by third part inspector, inspection on behalf of the buyer and authorized personnel from official regulations in addition to the tests performed on behalf of the manufacturer. This all encompassing certification is hence a fail proof quality ensuring specific testing. Rexal tubes provide a large number of products that possess this highly coveted certification of quality.

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