Vallourec Deutschland Gmbh

V&m Deutschland Gmbh

Thomas Müller

Nicolas Trapp

Norbert Arzt

Burkhard Helten

Thorsten Schmitz

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 Cand Cof the hollow section having a value &#x2266;1.5&#xd7;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 &#x2212;2% to &#x2212;13% and is determined according to the following formula:Reduction ratio[%]=[(2&#xd7;())&#x2212;&#x3c0;&#xd7;]&#xd7;100%/[2&#xd7;()].

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

The invention relates to a traction rod for bracing a crane jib, comprising a metallic tubular body and coupling elements which are connected to both ends thereof in an articulated connection of the traction rods among each other by means of bolts. According to the invention, the tubular body and the coupling elements can be detachably connected to each other, dispensing the need for a bonded connection, wherein the region of the connection is dimensioned in such a manner and is low on notch effects that, by calculation, the entire load capacity of the tube cross-section can be exploited with respect to a highest possible fatigue strength.

Traction rod for bracing a crane jib

The invention relates to a traction rod () for bracing a crane jib, comprising a metallic tubular body () and coupling elements () which are connected to both ends thereof for an articulated connection of the traction rods among each other by means of bolts (). According to the invention, the tubular body and the coupling elements consist of a one-piece tube portion, wherein the coupling elements are designed in each case as a thicker zone of the wall of the ends of the tubular body and are dimensioned in such a manner that a weakening of the cross section of the nominal wall thickness of the coupling elements, which has to be considered for calculating the load capacity of the tubular body, is prevented in the region of the bolt connection and the transition regions () from the respective thicker zones of the wall in the direction of the tubular body have a transition free of starting points for increasing fatigue strength.

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Rheinberg, Germany

Thomas Müller