Forgings in ASTM A105 normalised at -20¦F (-29¦C)

[federella]

Some studies have demonstrated that about 40% of Main Flanges in ASTM A105, despite the certificates, have not been treated properly after forging and that the transition temperature, with a mean impact toughness, of 27J is about + 20°C.
The question is how is possible that ANSI/ASME B16.34 authorized to employ this forging at - 29°C taking also in account the aggravating point that the mechanical properties can be verified with specimen obtained from separated forged test blanks (as per ASTM A105)?

 

[codeeng]

I guess it all boils down to reputable forging suppliers. Most users specify low temp material for anything less than -29C although ASME VIII can give impact test exemption down to -55F (-48C). I personally would not recommend impact testing A105, rather switch to A350-LF2.

 

[MarlaMike]

Also bear in mind ASTM A105 is not required to be heat treated in class 150 rating.

Mike