Method and strand guide for supporting, guiding and cooling casting strands made of steel, especially preliminary sections for girders

US7159642B2 · kind B2 · utility

Assignee

• SMS DEMAG LLC · DE

Inventors

• Adolf Zajber · Langenfeld, DE
• Dirk Letzel · Ratingen, DE
• Wilfried Milewski · Korschenbroich, DE
• Thomas Fest · Duisburg, DE
• Heinz-Dietrich Schneider · Duisburg, DE
• Lothar Fischer · Marl, DE
• Herbert Brotzki · Duisburg, DE

Key dates

• Filing date: Aug 7, 2001
• Grant date: Jan 9, 2007
• Expiry date: Dec 13, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22D11/1246
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method and strand guide for supporting, guiding and cooling casting strands (1) made of steel, especially preliminary sections (2) for girders, which are cooled by injected water (29) and are drawn, serve to prevent cracks, especially surface cracks, from appearing in the microstructure by adapting the cooling conditions of the surface of the strand in the region of the secondary cooling, and serve to prevent undercooling of the strand shell, wherein in order to avoid an undesirable solidification structure on the upper flange edges or in other cross-sectional areas, the cooling and support of the beam blank format are so adapted to the solidification range that cooling and support are provided exclusively where a crater is formed. To this end, the casting strand (1) is cooled, by guiding the temperature in a specific manner in upper supporting segments (5, 6, 7), by means of spray-water jets the width of which at least matches the length of the supporting rollers on longitudinal and transversal sides (13, 14) of the cross section (1a) of the casting strand, and is decreasingly supported in an analogous manner with respect to the length of the casting path and the cooling state i…