Sms Siemag Aktiengesellschaft

Rainer Teworte

Fritz-Peter Pleschiutschnigg

Dieter Rosenthal

Dieter Tembergen

A method for producing steel products () with optimum surface quality wherein the molten steel () is produced in a process route () that is selected according to a desired final microstructure (), by melting in a furnace () with an electrode system (), and in a vacuum degassing system; or by melting in a furnace installation () or an individual furnace vessel (), in a ladle furnace (), and in a differential-pressure vacuum degassing system (); or by melting in a furnace () with additions of alloying materials (), a partial-quantity degassing in the ladle furnace (), or a vacuum degassing system () and a ladle degassing ().

Method and installation for producing steel products with optimum surface quality

Disclosed are a method and an installation for producing steel products () having an optimum surface quality, especially extremely low carbon contents (UCL steel or IF steel), nitrogen contents, total oxygen contents, high-strength or stainless steel qualities. According to the invention, the liquid steel is cast into a thin slab () from a process route (, or) that is selected according to the desired final structure () based on an electric-arc furnace (), is descaled, cut into billets () having a partial length, optionally descaled once again, subjected to final descaling downstream from a holding furnace (), milled in a finishing mill train (), rolled up in a rolling station () located downstream from the last finishing mill stand () or downstream from a cooling section (), and the final structure () is adjusted in the cooling section () according to the desired steel quality by cooling on a run-out roller table (), whereupon the rolling stock () is completely rolled up in a second rolling station ().

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Duisburg, Germany

Rainer Teworte