SPARTAN III (HSLA-100) is one of the family of Spartan high strength (>690 MPa, or >100 ksi, minimum yield strength), high toughness, improved weldability steels, which are alternatives to traditional quenched and tempered alloy steels. The Spartan family of steels are low carbon, copper precipitation hardened steels. Spartan III has greater yield strength compared to Spartan I and Spartan II. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on forming and joining. Filing Code: SA-743. Producer or source: ArcelorMittal USA.