DS EN 4627:2008 Aerospace Series - Steel Fe-Pm 3504 (X4crnimo16-5-1) - Air Melted - Hardened And Tempered - Forgings - D[E] <= 150 Mm - 1100 Mpa <= R[M] <= 1300 Mpa Defines the requirements relating to: Steel FE-PM 3504 (X4CrNiMo16-5-1) - Air melted - Hardened and tempered - Forgings - D[e] <= 150 mm - 1100 MPa <= R[m] <= 1300 MPa, for aerospace applications.