Patent ID: 7374623
Filing Date: 2008-05-20
Classification: C21D,C22C,Y10T

Abstract:
1. A process for obtaining a metallurgical intermediate product, which comprises: producing in a ladle a liquid steel which consists of the following composition by weight: 0.0005%≦C≦0.15%; 0.08%≦Mn≦2%; Si≦0.040%; Al Al 0.0050%≦O P≦0.20%; S≦0.10%; B≦0.1%; and N≦0.0400%; and in which the dissolved oxygen content is maintained between said 0.0050 and 0.0500% by the establishment of a chemical equilibrium between the metal and the ladle slag covering it; establishing said chemical equilibrium by regulating the composition of the slag and agitating the liquid steel; and casting said steel on a continuous casting machine; wherein said continuous casting machine is a machine for the continuous casting of thin strips, having a thickness in the range of only 1-10 mm, in the ingot mold with one or more movable walls which follow the product in the course of solidification, wherein said machine is continuous casting between two rolls, and wherein the dissolved oxygen is sufficiently low to avoid a rimming of steel in the ingot mold during casting.