Would appreciate ASTM number for .125 thick carbon steel sheet for hot air duct at temperature 662 degrees F. that will be equal to the yield strength of A-36 at 80 degrees F. or ambient temperature.
Is A-36 steel angle a good choice for round duct flanges.
The duct size is 70 1/4" o.d.
The duct is made of 1/8" thick astm 515 gr 60
The duct carries air @ 662 degrees F.
The angle size is 2" x 2" x 1/4"