Hot rolled steel coils, as a result of the history of production, respectively processing, shows anisotropy of the mechanical properties, i.e. different mechanical properties in different direction. Therefore, the mechanical properties of hot rolled steel coils should be known in advance, respectively prior to its use as raw material for the production of various final products, particularly for spiral and longitudinal welded steel pipes, where mechanical anisotropy of hot rolled steel coils even more appears during the formation of hot rolled coils into the pipe. Mechanical testing of the hot rolled steel coils in transversal (T) and longitudinal (L) direction related to the rolling, were conducted.
The aim of this paper is to investigate anisotropy of the mechanical properties of the hot rolled steel (S355 EN 10025:2004) coils, used for the production of spiral and longitudinal welded steel pipes.