I am Looking for the ISO, EN, ASME or DIN equivalent of the following steel: BS 3603 COS27 LT50
The writing on the drawing from 1975 is awful, so it might be something similar like:
BS 3603 CDS27 LT50
BS 3603 C0S27 LT50
BS 3603 CAS27 LT50
It should be some material for tubes.
The other - almost...