Patent · US Active

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

US9056344B2 · kind B2 · utility

1Cited by

2References

4Claims

0Family size

Assignee

VALLOUREC DEUTSCHLAND GmbH · DE

Inventors

Thomas Müller · Langendorf, CH
Nicolas Trapp · Duisburg, DE
Norbert Arzt · Neuss, DE
Burkhard Helten · Duisburg, DE
Thorsten Schmitz · Krefeld, DE

Key dates

Filing date	Aug 12, 2010
Grant date	Jun 16, 2015
Priority date	—
Expiry date	Jan 13, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/12292
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

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:Reduction ratio R[%]=[(2×(H+B))−π×D]×100%/[2×(H+B)].

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.