Method and installation for producing bars with a refined and/or compressed structure by roll forging

摘要

The method involves use of continuously cast products (20) of forgeable steel quality and an approximately square cross section, with inclined corner regions (21), in the role of the initial material. At a forging heat above the transformation temperature, by continuous twist-free forming alternatingly in at least one two-roll stand and/or at least one four-roll stand, these products are subjected to a multistage reshaping process with a relatively small elongation and comparatively very high rolling forces to produce a rolled product with a compacted core. Also claimed is a corresponding rolling installation. Such an installation includes a preliminary rolling section consisting of at least some of the following forming facilities: (a) at least a two-stand block for preliminary sizing of the cast product; (b) at least one duo horizontal stand or duo vertical stand for smoothing the billet surface; (c) least one four-roll stand and (d) means for (preferably inductive) intermediate h eating of the rolled material.