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Abstract

This project grew out of the testing of a new kind of electric arc scrap melting furnace, the CONTIARC, which required a way of stopping the tapping channel after tapping had been completed. Various tests were made of a stopper rod in conjunction with a sealing element, which was thought to be necessary because of the erosion of the top tap hole brick. After successful tests on 50kg and 1t ladles, full-scale trials of the procedure - "stopping the tapping of a vessel filled with liquid steel by a stopper rod equipped with special sealing element" proved unsuccessful at first. Improvemnts in the mechanical equipment, and better understanding of the forces of current around the tapping hole, led to considerable improvement in later test runs, up to 100% sealing. The total of twenty trials 1996-1997, detailed in this report, demonstrated that complete and reproducable sealing could be achieved with the aid of a newly designed stopper rod even without any sealing element. Because the upper brick at the tap hole erodes evenly, maintaining its circular shape, it wa sfound that the sealing could be effected by geometrical means, the diameter of the stopper head being adapted accordingly. The test also discovered ways of extending the lifetime of the stopper rods beyond one week/ 140 tappings.

Additional information

Authors: FUCHS R, Demag AG Metallurgy, Duisburg (DE);THOMSEN F, Dansteel Engineering, Frederiksvaerk (DK)
Bibliographic Reference: EUR 18814 EN (1998) 31pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5613-5
Record Number: 199910687 / Last updated on: 1999-04-30
Category: PUBLICATION
Original language: en
Available languages: en
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