1968 steel beam

huangyhg

1968 steel beam
hi fellows
would any one tell me in us unit the steel beam is present eg.( i 12" x 5" x 30 # ), is it 12" - depth, 5" - flange width, and what is 30# mean (i assume it is thickness, but how is # related to ")? for steel beam in 1968, would i assume the steel strength 250mpa yield and 410mpa ultimate? where i can find out more infomation?
thank you for your help!
a steel beam fabricated in 1968 would likely be a36 steel, 36  kips/sq. in. yield.
the depth for the 30 pound/linear foot section is exactly 12 inches, and flange width is exactly 5 inches.
if the beam was fabricated prior to 1965, it would be a7 steel, 33 ksi yield.
the web is about 0.32 to 0.35" thick, and flange is average 0.54" to 0.544" thickness.