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 GradePlate UsedPlate GradeHeat Treatment
ASTM A671 GR. CA45 EFW pipes CL12Plain CarbonA 285/A 285M GRADE ANone
ASTM A671 GR. CA50 EFW pipes CL12Plain CarbonA 285/A 285M GRADE BNone
ASTM A671 GR. CA55 EFW pipes CL12Plain CarbonA 285/A 285M GRADE CNone
ASTM A671 GR. CB55 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 55None
ASTM A671 GR. CB60 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 60None
ASTM A671 GR. CB65 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 65None
ASTM A671 GR. CB70 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 70None
ASTM A671 GR. CC55 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 55None
ASTM A671 GR. CC60 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 60None
ASTM A671 GR. CC65 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 65None
ASTM A671 GR. CC70 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 70None
ASTM A671 GR. CA45 EFW pipes CL22Plain CarbonA 285/A 285M GRADE AStress Relieved
ASTM A671 GR. CA50 EFW pipes CL22Plain CarbonA 285/A 285M GRADE BStress Relieved
ASTM A671 GR. CA55 EFW pipes CL22Plain CarbonA 285/A 285M GRADE CStress Relieved
ASTM A671 GR. CB55 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 55Stress Relieved
ASTM A671 GR. CB60 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 60Stress Relieved
ASTM A671 GR. CB65 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 65Stress Relieved
ASTM A671 GR. CB70 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 70Stress Relieved
ASTM A671 GR. CC55 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 55Stress Relieved
ASTM A671 GR. CC60 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 60Stress Relieved
ASTM A671 GR. CC65 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 65Stress Relieved
ASTM A671 GR. CC70 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 70Stress Relieved
ASTM A671 GR. CA45 EFW pipes CL32Plain CarbonA 285/A 285M GRADE ANormalized
ASTM A671 GR. CA50 EFW pipes CL32Plain CarbonA 285/A 285M GRADE BNormalized
ASTM A671 GR. CA55 EFW pipes CL32Plain CarbonA 285/A 285M GRADE CNormalized
ASTM A671 GR. CB55 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 55Normalized
ASTM A671 GR. CB60 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 60Normalized
ASTM A671 GR. CB65 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 65Normalized
ASTM A671 GR. CB70 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 70Normalized
ASTM A671 GR. CC55 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 55Normalized
ASTM A671 GR. CC60 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 60Normalized
ASTM A671 GR. CC65 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 65Normalized
ASTM A671 GR. CC70 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 70Normalized
ASTM A672 GR. CA45 EFW pipes CL12Plain CarbonA 285/A 285M GRADE ANone
ASTM A672 GR. CA50 EFW pipes CL12Plain CarbonA 285/A 285M GRADE BNone
ASTM A672 GR. CA55 EFW pipes CL12Plain CarbonA 285/A 285M GRADE CNone
ASTM A672 GR. CB55 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 55None
ASTM A672 GR. CB60 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 60None
ASTM A672 GR. CB65 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 65None
ASTM A672 GR. CB70 EFW pipes CL12Plain Carbon, KilledA515/A515M GRADE 70None
ASTM A672 GR. CC55 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 55None
ASTM A672 GR. CC60 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 60None
ASTM A672 GR. CC65 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 65None
ASTM A672 GR. CC70 EFW pipes CL12Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 70None
ASTM A672 GR. CA45 EFW pipes CL22Plain CarbonA 285/A 285M GRADE AStress Relieved
ASTM A672 GR. CA50 EFW pipes CL22Plain CarbonA 285/A 285M GRADE BStress Relieved
ASTM A672 GR. CA55 EFW pipes CL22Plain CarbonA 285/A 285M GRADE CStress Relieved
ASTM A672 GR. CB55 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 55Stress Relieved
ASTM A672 GR. CB60 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 60Stress Relieved
ASTM A672 GR. CB65 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 65Stress Relieved
ASTM A672 GR. CB70 EFW pipes CL22Plain Carbon, KilledA515/A515M GRADE 70Stress Relieved
ASTM A672 GR. CC55 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 55Stress Relieved
ASTM A672 GR. CC60 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 60Stress Relieved
ASTM A672 GR. CC65 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 65Stress Relieved
ASTM A672 GR. CC70 EFW pipes CL22Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 70Stress Relieved
ASTM A672 GR. CA45 EFW pipes CL32Plain CarbonA 285/A 285M GRADE ANormalized
ASTM A672 GR. CA50 EFW pipes CL32Plain CarbonA 285/A 285M GRADE BNormalized
ASTM A672 GR. CA55 EFW pipes CL32Plain CarbonA 285/A 285M GRADE CNormalized
ASTM A672 GR. CB55 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 55Normalized
ASTM A672 GR. CB60 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 60Normalized
ASTM A672 GR. CB65 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 65Normalized
ASTM A672 GR. CB70 EFW pipes CL32Plain Carbon, KilledA515/A515M GRADE 70Normalized
ASTM A672 GR. CC55 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 55Normalized
ASTM A672 GR. CC60 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 60Normalized
ASTM A672 GR. CC65 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 65Normalized
ASTM A672 GR. CC70 EFW pipes CL32Plain Carbon, Killed, Fine GrainedA516/A516M GRADE 70Normalized

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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