Patent ID: 6491771
Filing Date: 2002-12-10
Classification: B22D

Abstract:
A process for producing continuously cast steel billets in a production plant which includes a vertical, round strand-casting machine with a horizontal run-out, at least one descaling device, and a following multi-stand rolling unit having horizontal roll stands and at least one vertical roll stand, said process comprising:after a round billet cast in a mold of said casting and having a diameter in the range of 90-300 mm has left the mold but before said billet enters the following rolling unit and while said billet is solidifying, subjecting said billet to a descaling and a cooling of an area thereof proximal a surface of said billet in a defined manner to a temperature optimum for the billet steel before working the billet; and working the billet over a course of at least three successive horizontal passes and then in one vertical pass, the billet being subjected to another descaling after the horizontal passes but before the vertical pass.