when was a36 steel introduced
 

when was a36 steel introduced?
analyzing roof of building constructed in 1966 for mechanical unit addition, have plans with sizes not grade, i thought it was in the 1950's. but was it used widely enough in 1966. i have a sixth addition aisc manual (1963) it lists both 33ksi and 36ksi. i may end up using 33 ksi to be conservative, but now i am curious.
astm-a36 was "originally approved in 1960", per the footnote in the current a36. actual usage could have lagged behind, i suppose.
yes, similar to our a992-gr50.
apetr26542, great question. i just reviewed the floor framing for a mechanical room in a building constructed about the same time as yours. i used the 33 ksi steel just to be conservative.
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