AbstractEN 1993‐1‐1 gives stability design rules for columns, beams and beam‐columns up to S460, whereas EN 1993‐1‐12 gives additional guidance for S500 up to S700. Recent studies on flexural buckling of welded H, I and box columns in steel grades S460 to S960, even though limited, show that improved curves can be used for members in high strength steel (HSS). This enhanced behavior is usually attributed to the improved material properties but mainly due to the more favorable residual stress distribution. Furthermore, the behavior of unrestrained beams in HSS has not been studied. At present in EN 1993‐1‐1, the design rules for lateral torsional buckling of beams are not dependent on the steel grade, meaning that the code does not distinguish between beams in conventional strength steel or HSS. In pursuit of answer to the mentioned shortcomings, within the European Project STROBE evaluation of the European stability design rules is carried out. The research is based on experimental programme covering 14 full‐scale tests, residual stress measurements, advanced numerical models and analytical derivations. This paper provides a summary of the experimental programme, the results for lateral‐torsional buckling of beams are discussed and further compared with the current code recommendations.