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:
Oct. 10, 1978
Filed:
Feb. 24, 1977
Gero Rath, Mulheim, DE;
Demag AG, Duisburg, DE;
Abstract
An improved method is provided for smelting steel from scrap in an electric arc furnace which reduces energy consumption, reduces operating noise, and improves the product quality in relation to the scrap charged. The method includes maintaining a continuous slag layer in the furnace vessel of a specific thickness and temperature, maintaining the furnace electrodes immersed in the slag layer, pre-heating the charge material to a specific range, and relating the charging speed to the processing speed of the furnace under prevailing operating parameters. By immersing the electrodes in the slag layer and avoiding direct contact thereof with the pre-heated charge material, heat transfer takes place between the electrodes and the slag, causing the slag layer to apply heat directly and continuously to the charge as it passes through the slag layer, thus avoiding violent reactions at the charge-slag interface, avoiding heat loss by radiation and causing continuous decarbonizing, desulfurizing and dephosphorizing of the charge throughout the slag layer.