CromElso 91 is a specially designed martensitic CrMoVNb steel for high-temperature creep resistance up to 600 deg C (1100 deg F). This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, and joining. Filing Code: SA-600. Producer or source: Industeel USA, LLC and Industeel France.