A-212-B versus A-515

[vragle]

thread177-29735
I am working on an old vessel that is constructed of A-212-B. Thickness is 2.35 inches. A-212-B was replaced by A-515. In regard to low temperature operation, the exemption curve UCS-66 lists A-515 under Curve B with no mention of whether or not it is normalized. Spec A-515 paragraph 5.2 states that thickness in excess of 2 inches shall be normalized. Curve C and D make no mention of A-515, only A-516. I do not have the old specification on A-212. Does anyone have any information as to whether there are requirements for normalization over a certain thickness. Based on information on A-516, the normalizing helps with the MDMT because it throws it into curve D of FIG. UCS-66. Does anyone have an old code book (pre 1967) that says what curve A-212 would be represented by in FIG UCS-66 or has any other information that would be helpful with my problem.

 

[SnTMan]

vragle I am looking at a '68 Code book. Part UCS 66 in its current form does not exist, i.e., no curves, etc. Part UCS-66 ('68) generally states no impact testing is required for MDMT to -20 F. SA-212 is not present in Table UCS-23, it appears it had been replaced by the '68 edition.

I don't have anything older that this, but the UCS-66 curves did not exist in those days.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[weldstan]

A-212B could be equivalent to A-515 or A-516 depending on whether it was made to fine grain melting practice or not. A-515 today is specified as being made to coarse grain melting practice and is governed by Curve B regardless of normalized or not. If your design needed low temp material you should have used A-516. To determine if your SA-212-B material was made to fine grain melting check the Al and the Vanadium and Niobium contents. Al should be > 0.020%. Back when your vessel was made the Curves did not exist but impact testing was still required for design temp below -20 F.

 

[metengr]

Most of the A 212B, even normalized, was coarse grained with normally poor notch toughness.

 

[vragle]

Thank you all for your input. Its truly amazing that there were not more brittle fracture problems in the 50s and 60s. I am new to ENG-TIPS. Its good to know there are knowledgeable people out there willing to share their knowledge.