US1547928A - Process of making alloy steel - Google Patents

Description

ing elements. or materials Patented Ju ly 28, 19 25. i 4

SUNITED" STATES, PATENT on 1,013 .f

ALAN xrssocx, or new YORK, 1w. 2;, Assmnon r0 CARL m." LOEB, or new You, is. Y.

rnocnss or Maxine ALLOY swam..

no Drawing.

To all whom it may concern: I

"Be it known that I, ALAN Kissoox, a citi-' zen of the United States, residing at New The invention relates to a novel processof producing alloy steel, .and in certain 10. aspects thereof it relates'more particularly to a'novel process of producing molybdenum alloy steel. I The process consists in the novel ste s and process hereinafter described; and t e 0b ects and advantages thereof are hereinafter pointed out in part, or will be obvious herefrom or may be ascertained by practicing the invention. I p The processis directed primarily to the alloying of steelwith a .suitable alloying metal .while obviating the preliminary .reduction of the alloym metal or metallic compound to the metallic state or condition, and also avoiding the addition of slag-formof the alloying agent or material-in the: steel furnace.

It is known in the art to make alloy steel,

bly adding to the fused steel inthe furnace is e alloying element after it has been reduced to the metallic state, which state in the case of different elements is designated ferrochromium, num, etc. I 86 In the case of molybdenum, it is further known that this metal may be introduced directly into the fused steel as an alloy in the form of certain salts thereof, without the preliminary reduction into the metallic state 40 in the electric furnace already referred to; that is, in the case of molybdenum, without such preliminary reduction to ferrd-molybferro-tungsten,- ferro-molybdedenum. Two instances of. such-salts of.

molybdenum and the direct alloying thereof with the steel are calcium molybdate (as disclosed in my United States Patent No 1,300,279 and iron molybdate (as-disclosed t1 nited States application Ser. No.

in my 714,769 filed May 21, 1924). I

7 There are many instances, however, in'

. which the use ofa salt, 'or

any chemicall the, -desired a lo jable and-yhdesi the presence of ing element is objectionble', asforinstance, in the in thereduction very direct and simple,

It utilizes as the alloying agent combined metal other than Application filed November 12, 1924. Serlalno. 749,581.

' manufacture of certain high-grade steels.

Withthe attainment of this object primarily in view, in accordance with vention, I employ as the alloying agent or substance one of the oxides of molybdenum,

preferably the tri-oxide, MoO,,.

.- Thesecompounds of molybdenum present. .or exman advantages foralloying steel. amp e, the tri-oxide may be produced directly and simply from high-grade molybdenite (MoSg) concentrates by a simple roasting operation, and without the addition of. any diluting material, such for instance as 'the compounds of iron or calcium.

' The molybdenum oxide may be introduced into the steel furnace by being added withthe char e, or may be introduced intohthe furnace s ag during the regular steelfmelting and refining process, or at other suitable time, the molybdenu'm oxide being absorbed into'the slag, and the metallic molybdenum being subsequently redpced therefrom by the contact of the molybdenum bearing slag with lybdenum content of the furnace slag in this mannerenters into and alloys with the steel in any desired proportion, de endent upon into the furnace.

of the molybdenum oxide.

The process of my 'present invention is and is exceedingly economicaL. a material of higher grade and greater purity, which is more entirely suitable in-the manufacture of better steels, as well as being desirable and advantageousin other connections.

It will be understood that the process is likewise workable with other substances manner 0 practicing. the invenlybdenum direct] to the steel furnace during the rocess 0 making the steel,whereby the oxi my present in- 1. The process of making molybdenum: steel comprising adding an oxideof moe is reduced by the constituents of 2;

the molten'steel beneath. The metallic mowhich behave in the same general manner I constitute the present the'steel-bath no other'reducingagent being added toefiectthe reduction of the molybdeoxide is reducedeby the steel itself, no other num oxide, reducing agent being added to effect the re- 2. The process of making molybdenum duction of the molybdenum oxide. 1

steel com rising adding a. charge consisting In testimony whereof, I have signed my solely o substantially pure molybdenum name to this specification. oxide directly to the steel furnace during the process of making the steel, whereby the ALAN KISSOCK.