specification designation number per ASME Section II

[H Cameron]

I see these two terms in marking ASME SA-480:

1- specification designation no.
2- material identification no

what is the differences and which one is equal Heat No.?

Thanks.

 

[EdStainless]

Neither, Those two are spec and grade. There is a longer list that includes identification of the mfg, the heat number, and a lot or process related ID.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[metengr]

The heat number is identified on the MTR under a separate heading or column.