METHOD FOR PRODUCING HOT-ROLLED HOLLOW PROFILED ELEMENTS HAVING SMALL EDGE RADII

摘要

The invention relates to a method for producing hot-rolled hollow profiled elements made of steel having a rectangular or square cross-section, wherein a substantially round pipe blank produced seamlessly by hot rolling or cold-rolled and welded and having a defined nominal outside diameter is first produced and then is formed into a hollow profiled element having the required cross-section at a forming temperature and the visible edges C1 and C2 of the hollow profiled elements have a value = 1.5 x t (t = wall thickness). For a specified profiled element cross-section, the pipe blank to be inserted into the profile rolling mill has a nominal outside diameter that is determined from a reduction ratio of the pipe blank to be achieved and the hollow profiled element dimensions to be achieved, wherein the reduction ratio lies in a range from -2% to -13% and is determined according to the following formula: reduction ratio R [%] = [(2 x (H + W)) - p x D] x 100 % [2 x (H + W)].