Most rebar in use today is manufactured in accordance with ASTM A 615, grade 60. That is, 60 ksi yield min and 90 ksi tensile min.<br>
There are other grades, grade 40, grade 75, etc.<br>
and other specifications, ASTM A 706, eg.<br>
I would assume ASTM A 615 grade 60 in most applications.<br>