Method of straightening sectional steel while simultaneously minimizing the internal stresses thereof

US6315845A · kind A · utility

Assignee

• SMS Schloemann-Siemag Aktiengesellschaft · DE

Inventors

• Georg Hartung · Seligenstadt, DE
• Lutz Kümmel · Jüchen, DE
• Bruno Bohmer · Erkrath, DE
• Wolfgang Roloff · Mönchengladbach, DE

Key dates

• Filing date: Jun 24, 1999
• Grant date: Nov 13, 2001
• Expiry date: Jun 24, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D9/0075
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method of straightening rolled sectional steel includes clamping and subsequently cooling at least a sectional steel whose maximum local cross-sectional temperature is below A.sub.r1 and whose minimum local cross-sectional temperature is above a lower limit temperature, wherein already the lower limit temperature produces as a result of clamping a thermal elongation in all fibers of the sectional steel which is greater than the elongation which would be required for a plastification of the fibers which would be subjected to the greatest internal compressive stresses if the sectional steel were exclusively air cooled without clamping.