Development of the wind energy industry continues to push the need for innovative solutions in terms of structural requirements. High-performance materials are thus needed to improve the efficiency of the structures and to ease the erection costs. The materials used for the towers have not improved significantly in the past years mainly because the design guidelines do not allow the efficient use of the high-strength steels. Lattice wind turbine towers could benefit from cost reductions if cold-formed high-strength steels would be used. Currently high-strength steel members have the same reductions coefficients in flexural buckling as normal strength steels. The approach towards the current European buckling curves draws attention to potential limitations. The residual stresses present in rectangular hollow sections are investigated based on the method of fabrication.