DS EN 3973:2007 Aerospace Series - Steel Fe-Cm3801 (X5crnicunb16-4) - Homogenized, Solution Treated And Precipitation Hardened - Investment Casting - D[E] <= 50 Mm - R[M] >= 1030 Mpa Defines the requirements relating to: Steel FE-CM3801 (X5CrNiCuNb16-4) - Homogenized, solution treated and precipitation hardened - Investment casting D[e] <= 50 mm R[m] >= 1030 MPa for aerospace appl