Method for producing hot rolled hollow sections having a rectangular cross-section and small edge radii

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United States of America Patent

PATENT NO 9056344
APP PUB NO 20120244372A1
SERIAL NO

13393030

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Abstract

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In a method for producing hot-rolled sections of steel with a rectangular or square cross-section, a substantially round pipe blank produced seamlessly by hot rolling or cold finished and welded and having a defined nominal outside diameter is initially produced and then formed at a forming temperature into a hollow section having the required cross-section, with visible edges C1 and C2 of the hollow section having a value ≦1.5×t (t=wall thickness). The pipe blank has a nominal outer diameter determined from a reduction ratio of the pipe blank to be achieved and the hollow section dimensions to be achieved, wherein the reduction ration lies within a range of −2% to −13% and is determined according to the following formula:

description='In-line Formulae' end='lead'Reduction ratio R[%]=[(2×(H+B))−π×D]×100%/[2×(H+B)].description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
VALLOUREC DEUTSCHLAND GMBHTHEODORSTRASSE 109 40472 DÜSSELDORF

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arzt, Norbert Neuss, DE 1 0
Helten, Burkhard Duisburg, DE 1 0
Müller, Thomas Rheinberg, DE 200 771
Schmitz, Thorsten Krefeld, DE 2 0
Trapp, Nicolas Duisburg, DE 1 0

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