The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1977
Filed:
Nov. 11, 1975
Aldo Ramacciotti, Rome, IT;
Centro Sperimentale Metallurgico S.p.A., Rome, IT;
Abstract
Large steel ingots are produced without pipe and blow holes and with minimum segregation, by teeming the steel into an ingot mold having a hot top that tapers upwardly and whose open upper end is largely filled by an electrode that is spaced from the steel by an electrically conductive slag. During a first stage, current is passed from the electrode through the slag to the steel at a rate to keep the slag and the steel in the upper end of the mold molten. During a second stage, the current is increased and the electrode consumed to restore the liquid level that has fallen due to contraction upon solidification, the electrode having a lower content in segregating elements than the steel. During a third stage, the current and the metal addition are reduced until the ingot is completely solidified.