I'm trying to render a steel plate with the Anistoropic BSDF. I would like to have curved reflections as it happens in pans or pots (for cooking). Instead, when I render, I get this strange straight lines appearing on the plate surface, and I cannot get rid of them. As a source light I'm using two planes with emmision. Here are images of the case (with the plate nodes) and of the rendered image. I don't know it this can help, but it was created with FreeCAD. May be it can be related with the problem.
Here is the link to the blender file
Thanks all for you help.