Base Metal Grouping

[JustinShelley]

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

 

[Duwe6]

Sorry, doesn't work that way. ASME has no provision for putting an unknown metal into one of the "P" groups. If you can find a SA spec [SA-53 Gr. B looks probable] that your stuff matches, then you can see what P-group in Sect IX it falls in, for PQR/WPS purposes.

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.

 

[stanweld]

Where did you get those hardness values? What was the Rockwell hardness Scale? What was the equivalent BHN or Vickers hardness with Equotip? The tensile strength and chemistry are indicative of A-36, A-515 Gr 60, A-285 C, possibly A-516 Gr 60 for plate or A-106 B, possibly A-333 Gr 6 for pipe.