Method for producing a hot-rolled strip

US6855218B1 · kind B1 · utility

Assignee

• THYSSEN KRUPP STAHL AG · DE

Inventors

• Rudolf Kawalla · Bottrop, DE
• Hans Pircher · Oberndorf bei Salzburg, AT
• Thomas Heller · Pittsburgh, US
• Bernhard Engl · Dortmund, DE
• Pino Tesè · Oberhausen, DE

Key dates

• Filing date: Feb 24, 2000
• Grant date: Feb 15, 2005
• Expiry date: Feb 24, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D9/573
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing hot strip which features good forming ability and increased strength. This is achieved in that a hot strip (W) which is produced in particular from continuous casting in the shape of reheated slabs or slabs obtained directly from the casting heat, from thin slabs or cast strip, based on a steel comprising (in mass %) C: 0.001-1.05%; Si: ≦1.5%; Mn: 0.05-3.5%; Al: ≦2.5%, if necessary further elements such as Cu, Ni, Mo, N, Ti, Nb, V, Zn, B, P, Cr, Ca and/or S, with the remainder being iron as well as the usual accompanying elements, is continuously finish rolled and subsequently continuously cooled, with cooling taking place in at least two subsequent cooling phases (tCK, tLK) of accelerated cooling, to a final temperature; with the first cooling phase (tCK) of accelerated cooling starting at the latest three seconds after the last pass of finish rolling; and with the hot strip (W) during the first cooling phase (tCK) of accelerated cooling being cooled at a cooling rate of at least 150° C./s.