Base Metal Grouping
Base Metal Grouping
(OP)
I am working on a job where the material type is unknown, so material samples were taken from the member and sent to an engineer for testing. He has given a report of the chemical composition, which I have listed below, and he has grouped the material as an AWS D1.1 Group II.
What properties determine which base metal grouping this material would be? I have compared his results to an MTR of an AWS Group I material, and they are very similar. I have tried to contact the engineer who pefromed the testing and cannot get an answer from him. I need to find a material type for PQR testing, and a Group II material in pipe form is limited to just a few types.
Equotip Field Hardness 393 / 375
Rockwell Hardness 69
Tensile Strength 60 KSI
C .20
MN 1.13
SI .21
P .012
S .020
CR .07
V .03
MO .02
NI .06
CU .14
CE .43
What properties determine which base metal grouping this material would be? I have compared his results to an MTR of an AWS Group I material, and they are very similar. I have tried to contact the engineer who pefromed the testing and cannot get an answer from him. I need to find a material type for PQR testing, and a Group II material in pipe form is limited to just a few types.
Equotip Field Hardness 393 / 375
Rockwell Hardness 69
Tensile Strength 60 KSI
C .20
MN 1.13
SI .21
P .012
S .020
CR .07
V .03
MO .02
NI .06
CU .14
CE .43





RE: Base Metal Grouping
Have *all* the ASTM/ASME Sect II testing that your proposed ASTM/SA spec requires. Usually includes bends and flattening. If your metal matches the spec, it IS the spec. Nothing wrong with self-certifying metals, *IF* all the Spec-required testing is done, using calibrated & NIST-traceable instrumentation.
Equotip is never/has never met accuracy and/or traceability standards. Better than nothing, but not much.
RE: Base Metal Grouping