Schwingfestigkeit von hochfesten Feinkornbaustählen im brenngeschnittenen Zustand. Forschungsbericht.

In this research project the fatigue behaviour of flame cut specimens of the high-strength fine grained structural steels StE 355, StE 460, StE 690 and StE 890 was investigated, taking into account the following parameters: -Influence of the flame cutting speed, -Influence of preheating, -Influence of plastic deformations of the heat affected zone, -Influence of local damages onto the flame cut edges, -Influence of the surface quality of the remaining surface (quality of the not flame cut surface area). The results of the fatigue tests were correlated with the surface roughness, the hardness distribution and the residual stress distribution of the specimens. The results of this research project were also compared to the limits given by the commonly used design codes Eurocode No. 3, DIN 15018, DS 804 and SIA 161.