Aldur 620 steels (minimum yield strength of 620 MPa, or 90 ksi, for thicknesses up to 50 mm, or 2 in.) are a part family of water-quenched, high-strength, fine-grained steels that have excellent toughness at low temperatures. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on low temperature performance. Filing Code: SA-853. Producer or source: Voestalpine Grobblech GmbH.