METHOD FOR PRODUCING AN ELONGATED HOLLOW BODY CONSISTING OF STEEL AND HAVING A POLYGONAL, IN PARTICULAR SQUARE OR RECTANGULAR, CROSS-SECTION
The invention relates to a method for producing an elongate hollow body consisting of steel and having a polygonal cross-section, comprising the following steps: producing an intermediate hollow body having a round cross-sectionfrom a flat pre-materialor from a block-shaped pre-material,whereby the intermediate hollow body is cooled or quenched with partial or full phase transformation,testing the intermediate hollow body in a non- destructive manner, final-shaping without intended reduction of the wall thickness of the intermediate hollow body to form a final hollow body having a polygonal, in particular square or rectangular, cross-section, final-heat treating the intermediate hollow body immediately prior to the final-shaping or final-heat treatment and final-shaping the intermediate hollow body in a common step. This method can be used to produce hollow bodies having increased dimensional stability, in particular narrow dimension tolerances. The hollow bodies are heat-treated and tested in a non-destructive manner.