This paper is concerned with the material characteristics of various commercial high strength structural steels (yield strengths between 460 and 700 N/mm2) at elevated temperatures. These steels vary in chemical composition and production route but have similar tensile properties at ambient temperature. Preliminary data of the following: proportional limit (fp,θ), elastic modulus (Ea,θ), effective yield strength (fy,θ) based on the total strain level at 2% (in accordance with the Eurocode approach) obtained from isothermal tests are presented as reduction factors and compared with literature and the Eurocode (EN 1993-1-2). The consequences for material selection and design are also discussed.The authors would like to acknowledge the EPSRC and TWI Ltd. for the financial support provided for this work through an Industrial CASE award scheme
