The method involves providing a circuit board (3a) from a curable steel material. A coated circuit board (3b) is heated on a target temperature above austenitizing temperature under simultaneous coating of a surface portion of the circuit board (3a) with an anti-corrosive coating. The thermal and/or mechanical process steps are carried out for preparation of a hardened structural steel structure (1). The circuit bath is immersed in a coating bath (4) of a coating container (5). The coating bath is made of zinc, aluminum or alloys of zinc or aluminum. An independent claim is included for semi-hardened structural steel structure.