US1300279A

US1300279A - Process of making alloy steel.

Info

Publication number: US1300279A
Application number: US25175018A
Authority: US
Inventors: Alan Kissock
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-08-28
Filing date: 1918-08-28
Publication date: 1919-04-15
Anticipated expiration: 1936-04-15

Description

UNITED STATES PATENT OFFICE.

ALAN KISSOCK, OF TUCSON, ARIZONA.

PROCESS OF MAKING ALLOY STEEL.

No Drawing.

To all whom it may concern Be it known that I, ALAN Kissock, a citizen of the United States, and a resident of Tucson, Arizona, have invented a new and useful Process of Making Alloy Steel, of which the following is a specification.

The invention relates lto a. process of making alloy steel, and the objects and advantages thereof will be set forth in part hereinafter and in part will be obvious herefrom or may be learned by practice with the invention.

The invention consists in the novel steps and processes herein described.

In the manufacture of alloy steel the usual practice is to add or introduce into the fused steel the alloying element, such as tungsten, chromium, molybdenum, vanadium, etc., in the elemental form or in the form of a high grade alloy of such alloying metal, usually with iron, known as the ferro state. This involves as a preliminary step, in order to obtain the alloying metal in the elemental or ferro state, the reduction of the ores or salts of these elements to the metallic form this being usually done in an electric or other suitable furnace.

The oxids of certain elements, members of the fifth and sixth groups of the periodic System, such as molybdenum, tungstemchromium and vanadium, each combine with the oxids of certain other elements, more especially with certain of the alkali metals and the alkaline-earth metals, of which calcium oxid may be regarded as an example, to form a salt of the general type known as molybdate, tungstatc, vanada-te, etc., of calcium or other such element. In the case of the particular elements just enumerated, these salts would be of the eneral forms CaOMoO CaOWo and Ca V 0 At the present time, I prefer to employ the salts of calcium of the respective metals, and also prefer at present to employ either molybdenum, vanadium or tungsten as the constituent element of the salt which reduces to produce the alloying metal for the steel. These salts of calcium can all be produced from the ores of these elements without the use of furnacing and often these salts are necessarily produced in the ore reduction process. That is, the ferro state of these elements may be obtained or produced by furnace reduction of their calcium salts Specification of Letters Patent.

Patented ADI. 15 1919.

Application filed August 28, 1918. Serial No. 251,?

which have in turn been produced from the ores.

The present invention obviates the preliminary or preparatory reduction ofthe ores or salts of these desired alloying elements to the metallic state, and provides for introducing the alloying metal directly from the salt of the metal into the steel.

The procedure under my present method is essentially that instead of reducing the orcs of these elements to the metallic state in an outside furnace, and then introducing such alloying element into the molten steel,

the calcium salt is added directly into the steel melting furnace. The carbon content of the steel and its bath, which carbon is actually previous alloy of the steel, reduces the calcium salt of the molybdenum, vanadium, tungsten, or other alloying element, the so reduced element alloying directly with the steel. If desired other carbon may be added to, or substituted for, the carbon content of the steel and its bath. The calcium oxid which is a constituent of the salt fixes the metallic alloy element and prevents its volatilization, thus avoiding loss, and pre- SPlits the element capable of alloying directly with the steel in the melting furnace. Some other suitable reducing agent other than carbon, such as silicon, which also may be a previous alloy of the steel, may be employed in the melting furnace. There are thereby eliminated the outside reduction of the ores or salts of these elements, with the attendant time, cost and labor, and large furnace losses of these costly elements are likewise avoided.

That I claim is 1. The process of making alloy steel which comprises reducing a suitable salt of an alloying metal by subjecting the salt to furnace temperatures for a protracted period in the presence of fused steel by the carbon or silicon contained in the steel acting directly upon the salt whereby the alloying lnetal is reduced directly from the salt and immediately enters the steel without the preliminary conversion into a ferro alloy of the alloying metal of the salt preparatory to its introduction into the steel.

2. The process of making alloy steel which comprises reducing a suitable salt of an alloying metal by subjecting the salt to furnace tmnperatures for a protracted period in the presence of fused steel by a reducing agent which constitutes a previous alloy of the fused steel acting directly upon the salt whereby the alloying metal is reduced directly from the salt and immediately enters the steel without the preliminary conversion into a ferro alloy of the alloying metal of the salt preparatory to its introduction into the steel.

3. The process of making alloy steel which comprises reducing an alkali metal salt 01 allmline-earth, metal salt of an alloying metal by subjecting the salt to furnace temperatures for a protracted period in the presence of fused steel by the carbon content of the steel and its bath employed in the steel process acting; directly upon the salt whereby the alloy metal is reduced directly from the salt and immediately enters the steel without the preliminary conversion into a term alloy of the alloyinp metal of the salt preparatory to its introduction into the steel.

4. The process of makin alloy steel which comprises reducing a sail of an alloying metal of the fifth or sixth periodic group by subjecting the salt to furnace temperatures for a protracted period in the presence of fused steel by the carbon content of the steel and its bath employed in the steel process acting directly upon the salt whereby the alloying metal is reduced directly from the salt and immediately enters the steel without the preliminary conversion into a ferro alloy of the alloying metal of the salt preparatory to its introduction into the steel.

The process of making alloy steel which comprises reducing a metallic salt of an alloying metal by subjecting the salt to furnace temperatures for a protracted period in the presence of fused steel by the carbon content of the steel and its bath employed in the steel process acting directly upon the salt whereby the alloying metal is reduced directly from the salt and immediately enters the steel without the preliminary conversion into a ferro alloy of the alloying metal of the salt preparatory to its introduction into the steel.

6. The process of making alloy steel which comprises reducin a calcium salt of an alloying metal of t e fifth or sixth periodic group by subjecting the salt to furnace temperature in the presence of fused steel by the carbon or silicon content of the steel and its bath employed in the steel process acting directly upon the salt whereby the alloying metal is reduced from the salt and directly enters the steel as an alloy.

7. The process of making alloy steel which comprises reducing calcium molybdate, at furnace temperature in the presence of fused steel by means of carbon as a reducing agent whereby the. reduced molybdenum is caused to enter the steel.

8. The process of making alloy steel which comprises reducing calcium molybdate at furnace temperature in the presence of fused steel whereby the reduced molybdenum is caused to enter the steel as an alloy.

9. The process of making alloy steel which comprises reducing a suitable salt of an alloying metal at furnace temperature in the presence of fused steel by a reducing agent which constitutes a previous alloy of the fused steel. whereby the alloying metal is reduced directly from its salt and immediately enters the stcel without the preliminary conversion into a ferro alloy of the alloying metal of the salt preparatory to its introduction into the steel.

10. The process of making alloy steel which comprises reducing a suitable salt of an alloying metal at furnace temperature in the presence of fused steel by the action of carbon as a reducing agent thereby reduc ing the alloying metal from its salt and causing' it to immediately and directly enter the steel as an alloy thereof.

11. The process of making alloy steel which comprises reducing an alkali metal salt or allmline-carth metal salt of an alloy ing metal of the fifth or sixth periodic groups at furnace temperature in the presence of fused steel by the action of carbon as a reducing agenh thereby reducing the metal directly from its salt and causing it to immediately and directly enter the steel as an alloy thereof.

12. The process of making alloy steel which comprises reducing a. salt of an alloying metal at furnace temperature in the presence of fused steelby a suitable reagent whereby the alloying metal is reduced directly from its salt and immediately enters the steel without the preliminary conversion into a ferro alloy of the alloying metal of the salt preparatory to its introduction into the steel.

In testimony whereof I have signed my name to this specification.

ALAN KISSOCK.