Hot-rolling steel strip

US6284069A · kind A · utility

Assignee

• THYSSEN KRUPP STAHL AG · DE

Inventors

• Hans Pircher · Oberndorf bei Salzburg, AT
• Manfred Espenhahn · Essen, DE
• Rudolf Kawalla · Bottrop, DE
• Waldemar Wolpert · Dinslaken, DE

Key dates

• Filing date: Dec 28, 1999
• Grant date: Sep 4, 2001
• Expiry date: Dec 28, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21B2201/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing strips of homogenous structures and characteristics made of non-alloyed and low-alloyed steel by continuous hot rolling in several roll passes in the austenitic region and subsequently in the ferritic region, as well as coiling. The invention is characterised in that continuous-cast strip and/or strip rough rolled in the austenitic region, starting with a temperature T.gtoreq.Ar.sub.3 +30.degree. C., with a total degree of deformation of e.sub.h.gtoreq.30% is rolled in two or several roll passes in the austenitic region and in that the rolling stock is intensively cooled after every roll pass until the ferritic transformation has been completed, after which the rolling stock is end rolled to final thickness in the ferritic range in several passes with a total degree of deformation e.sub.h.gtoreq.60%.