I have a problem with selection of material from table 1A of sec. II part D. for example there are two row for SA-182 TP 321 and all the specifications for both are the same except allowable stress and applicability of use for sec. VIII. This way when material in mechanical data sheet is selected to be SA-182 TP 321,who am I sopposed to know which one shall be considered???
Thanks in advance.

Vahid,
You may get some info if you read the notes at the last column of the relavent material in table 1A.