What reference gives you the information regarding .20 max carbon?
As for your other comment, Table 2, Chemical Requirements, lists that as a note for Plate material. There is no mention of the .20 carbon though.
Thanks
Charles
Very interesting dialog, in which I can't take part because the newest edition of ASTM standards we've got here at Mackenzie University library is from 1996.
qcman74's statement makes sense and justifies calling that steel a "Modified A-36", because the carbon content has decreased and the manganese has increased to compensate for it.
To further discuss this matter you gentlemen should have on hand the latest edition of the ASTM book, otherwise the discussion would be based on a standard that's possibly obsolete.
Giovanni S. Crisi
Sao Paulo - Brazil