Difference Between ss316 and F316 Material

"ss" is a general term meaning stainless steel.

F is used in many ASTM designations for forged materials, such a forged elbows or flanges.

Your two material designations are not specific enough....they are too vague.

For example a piping flange may be designated as ASME B16.5; Class 150 Grade F316L

But..can you describe SS316F? how is it different from SS316?

I guess its ss316F

I saw it on sea vessel scrap. interestingly, internet is of not much help to describe this unique grade.