Marvac 300 is a clean high-strength maraging steel capable of 1862 MPa (270 ksi) minimum yield strength. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Fe-164. Producer or source: Latrobe Specialty Steel Company.