It would be better if you would give a description of the issue, then ask a specific question. That way, even if someone is not familiar with B516, they can offer potentially helpful information or guidance.

You're information and question are both cryptic and confusing.

then we specific this Question.

In the B 516-03
 Standard Specification for Welded Nickel-Chromium-Iron Alloy
(UNS N06600, UNS N 06602, UNS N06025, and UNS N06045) Tubes

we find in the 1 Table from Side 2 this some Words in the N06603

 Nickel Bal
Chromium 24.0-26.0
Carbon 20.0-24.0  is identic with C or not

and i think this must be a Error (N 06603 give me a 0,2 - 0,4 C or for you Carbon)

But next Question for the B517-03 the same C = Carbon with 20,0 - 40,0 %

nice Weekend

Yes...that looks like an error. Carbon content should not be that high.  Probably a missplaced decimal point.  Check with ASTM (www.astm.org) and they will clarify.

A Mail to the Committee B 02 is out, but Weekend.
But to many Errors in some Standard´s. Find the next One in the A-Serie.