The Fe 415 in steel mentions its grade. i.e., the yield stress of steel - 415 N/mm2 Some of the various grades of steel are Fe 250, 415, 500, 550
it means tensile strength of 415 N per sq. mm
High Yeild Steel bars of Yeild strength equal to 415MPa.
The word ‘fé’ is a dialect version of the preposition ‘faoi’, meaning ‘under’
415 is the tensile strength of steel when it is subjected to elongation. for Fe 415 , tensile strength is 415 N/mm2- K @ $ ! civil engineering - GITAM UNIVERSITY