US1545690A - Method of deoxidizing open-hearth-steel baths - Google Patents

Description

- and more valueless.

.Patented July 14,, 19 25.

UNITED'STATES PATENT OFFICE.

NAPOLEON PETINOT, OF NEW YORK, N, Y.,

AND JOHN MGCONNELL, 0F CANTON, OHIO.

No Drawing.

To all whom it may concern: Be it known that we, NAPOLEON PETINOT and JOHN MCCONNELL, citizens of the United States of America, and residents, respectively. of the city, county, and State of New York, and the city of Canton, county ofStark, and State of Ohio, have invented a new and useful Method of Deoxidizing Open-Hearth-Steel Baths, of which the following is a full, clear, and exact description. Our invention relates generally to a meth od ofv deoxidizing open hearth steel baths, particularly to such a method, when employed with an alloy of aluminum, silicon, and iron.

/ Those familiar with the art of making steel by the open hearth practiceknow that the steel bath is kept oxidized not only by the oxidizing atmosphere of the furnace, but also by done to. help cut down the carbon in the initial charge to the proper amount desired.

It is well known that if steel is poured from a bath having such a degree of oxida tion as just'described, the' product will be It has, to deoxidize the steel by adding ferro silicon or aluminum to the ladle after the furnace has been tapped.

The most useful and efficient deoxidizer known is aluminum, but on account of its low specific gravity, it will float in the bath, and thus will not be thoroughly diffused therein. Therefore, aluminum has been heretofore only useful as a deoxidiz'er, when added to the ladle. If it is addedto the bath, it will only react on the impurities contained in the slag.

In carrying out our invention, we employ an alloy, such as that described .in the copending patent application of Napoleon Pet-inot for a deoxidizer for open hearth steel baths and a method for making the same, filed January 30, 1924, and given Serial No. 689,565. Analloy, such as described in the said copending' Petinot application, being cast in shaped form, should be sufliciently large so as to sink under the slag in the open hearth steel bath. The alloy may be added to the bath at any time when it is desired to deoxidize it. When such an addition is made and a sufiicient quantity of the deoxidizer has been added it will be noticed thatethebath instead of being agitated will lie quietly. If kept too the addition of iron oxide. .This is therefore, been necessary Application filed February 11, 1924. Serial No. 692,177.

long in the bath, however, it will reoxidize on account of the oxidizing atmosphere of Thus when my new deoxidizing element is in solution with the steel, the oxides of silicon, aluminum, and the like will rise to the slag at the top of the molten bath, and will combine with it, as will be plainly evident to the operator. carrying out the method. If a plain carbon steel is thus made, a deoxi-dizing -metal can then be tapped into the ladle.

When an alloy steel is desired, such as chromium, chrome vanadium, and the like, alloying elements such as ferrochromium, ferrovanadium and the like maybe added to the charge immediately after the addition -of the deoxidizer above described.

One or, the very important advantages resulting from the practice of our invention will be that when the bath. deoxidizes by means of the addition of the deoxidizer above described, the alloying element (such 7 as chromium, for example,) during its melting, will be uniformly distributed through and be. intermingled with the bath and will be protected, so that a much better yield of that element will be obtained.

Obviously some excess of the special deoxidizer of the said Petinot application obvious that some modifications thereof may.

be made without departing from the spirit of our invention or the scope of the appended claim, and we donot, therefore, wish to be limited to the preferred form herein described.

I may be and in some cases should be added Having thus described our invention what we claim is: 4 v

A method of deoxidizing open hearth alloy' steel baths comprising the addition steel, then adding a sufiicient quantity of the metal or metals to be desired in the finished product in the form of a ferro of such metal-or metals so as to produce the cient amount of such deoxidizer being added to reduce the various oxidespresent in the 15 bath and avoid any possible reoxidization' of the same, whereby a greater yield will be efi'ected and the cost of making alloysteel products will be reduced.

In testimony whereof, w signed our names,

NAPOLEON PETINOT. JOHN MGCONNELL.

have hereunto