I am working on a project looking at transmission towers that were constructed around 1935 to 1950 period. The transmission towers are constructed with various sizes of structural angle up to 6x6 inches profile. The angles were constructed from steel grade CESA S40 which is medium tensile steel with properties Fy=33ksi and Fu=55 -65ksi. The angles were manufactured by the illinois steel company but the design drawings do not indicate as to what manufacture standard was used. Does anyone know what ASTM or CESA standard for structural angles in the US or Canada that would apply in the period 1935 to 1950's? I have tried going through the ASTM website but can't access any old standards.
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