Strenx 1300 is a very high-strength structural steel with a minimum yield strength of 1300 MPa (189 ksi). Typical applications include load-carrying structures that place very high demands on low weight. S5188 This datasheet provides information on composition, physical properties, tensile properties, and bend strength as well as fracture toughness. It also includes information on surface qualities as well as forming. Filing Code: SA-783. Producer or source: SSAB Swedish Steel Inc..