RUUKKI OPTIM 550 MC (550 MPa minimum yield strength) is a thermomechanically rolled (M), cold formable (C) steel that exceeds EN standards requirement (EN 10149-2). This datasheet provides information on composition, physical properties, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: CS-172. Producer or source: Rautaruukki Corporation.