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:
Mar. 28, 1978
Filed:
Apr. 12, 1977
Pierre Leroy, Saint-Germain-en-Laye, FR;
Creusot-Loire, Paris, FR;
Abstract
In use of a steel converter into which oxygen is blown through tuyeres, each tuyere being protected by flow of a protective liquid containing hydrocarbons along peripheral passage means in the tuyere, the tuyeres are protected against wear by dividing the refining process into at least two stages, in the first stage which extends from the beginning of the refining process to a point at which the carbon level in the molten metal is 0.300 to 0.700% the protective liquid flows at a first rate and in the second stage which extends from the end of the first stage to a point at which at least 90% of the total amount of oxygen has been blown in, the protective liquid flows at a second rate in the range 0.08 to 0.15 liters per minute per centimeter of the mean circumference of the passage means in each tuyere, the first rate being in the range 0.4 to 0.6 times the second rate.