Method of melting manganese steel

Abstract

Claims

manganese wmmmmm-ms-w EIEAN E-Hll" To all whom may concern r, m 1 w fT- no it moon int muster a. \lbIIOLs, c citizen of the United States, residing at llhicego Heights, in. the county of Cool: and :uess steel objects, and. has for its purpose reduce the loss of manganese in the of melting the steel scrap. The increased availability of manganese steel scrap as a commercial product, and the r naively high cost oi obtaining manganese l by the of term-manganese, o *oruloined to render "very important the every t economical methods in the resign)? manganese steel withoutexcesof its content. Imporodrsnces toward end have been --e, in the adoption oi the electric furnace i relatively atmosphere; in the stood of. conducting the. heat which rethe duration of time to minimum hath is at or cal temperature bec'drawing the charge; and in special atiren to the chemical constituency is prt nine slag; Wuich covers the oath. notw 'hstendiug these precautions, iul as they are, the loss of manganese cited msntranese steel as practiced s present i en'tion has been excesi in the perisnce of some loundis the practice of manganese steel scrap and induced i uurn to the practice of combining ferropnnese with low carbon steel by depositt into the ladle at the time of drawing Jest. Nor can the excessive loss of men- 7 so from manganese steel scrap he set- .ctorily compensated by the addition of @111811Q2L36S8 to the meltcdscmp because the excessive Cfll'llOll constituent in the route manganese stool resulting from the addition of the carbon. unavoidably present in the i erroonanganesc to that already presin remaining with the steel scrap. loss of manganese trom melted scrap, course, occu s loy the process of oxidation. s has been satisfactorily controlled in the 7 hath by the use of a basic ootning and by cure in building up the :1 his hlaulcet slog. But the loss steel scrap lor'casting into inun- "53 G. ETEIGHGLE, SI Q'JEICAGO HEIGHTS, ILLINUIS, ASSIGNOR TO AMERICAN !l CUZliITlANlZ', OF CHIGAGO, ILLINOIS, A CORPORATION OF MAINE. 233 103 F MEETING MANGANESE STEEL. Application filed liecemher '7, 1922. Serial No 605,512. resulting from the passage of manganese oxide into the slug: has not heretofore been satisfactorily prevented For the reason that in spite of ell'orts to maintain basic conditions in the slug. combining of the readily oxidizable manganese has taken place, and in spite of the use of curlrouiferous reagents upon the slug, the manganese has become irretrievuhly incorporated therein. Now, the present invention avoids the dif-, ficulties recited and provides a method- Wherehy manganese steel scrap can be successfully and economically melted for reuse as manganese steel, and a steel of great purity and high physical character obtained. The underlying feature of the invention consists in melting steel containing manganese, in a furnace that is not only rendered usbasic and as free from oxygenloearing environment-us practicable, out is provided with 21- readily .oxidizalole ingredient nt the level of and preferably also shove the slug that takes up the oxygen of i the slag or that contained in acid or other oxidizing influences thereof, and leaves the slag more nearly neutral and the greater portion of manganese which enters the slag free to return to the bath. The readily oxioliheble ingredient is preferably iron in mete. lic form, but it may be any metalliierous suhstance having a sufiicieut sltinity for oxygen and not incompati hie Withvthe desired formula of the hath. Again, the metal. or metalhferous lngreclient is preferably incorporated in the lining of the furnace and particularly that pert of the lining which surrounds and lies shove the slag. The roof also will prefcrohly be lined With basic material, although not necessarily with metalliferous material. A convenient method of bringing metal into the descriloed relation to the slag covering of a loath of manganese steel in in electric arc furnace is to line the furnace or at least thoseparts of the furnace which are critical tothe present process, with material commercially known as metalkasc brick, which consists of a sheet metal jacket of approximately rectangular section filled with magnesite (lime and magnesia), in such a manner that the edges of the sheet metal jackets are exposed to the heat of the furnace, and melt and run down into the slag in quantity suliicient to neutralize the above 'sfieel castings, which consists oxidizing influence in the slag. Run the rosult may also be obtained, at least to n measurably boneficial by oiliorwise incorporating iron in metallic state with tho lining brick. The e'ifect of the iron clad brick or rick otherwise associated W. l1. the iron is not merely that incident to i iio basic nature of the lining thus insured; ii; is not to insuro neutrality in the eilcot of the lining, lwui: to lend a positively rcuctivo element at and the level of the slug, l". claim: L The iniprovemmit in The art of melting manganese steel scrap to produ 'ningrnneso .n sulij in the steel scrap io fusing temperature in a a relatively inert oi'ivironmcnt and under i'llS protection of a. covering of Wllill, providing at or above the lorci of readily oxiclizalilo nwtnlliforou subsmnco ilio n not incompatible with the formulaof fihe bath. 2. The iin n'oveineni in the art of melting manganese steel scrup,'an(l conserving therein the contained manganese; the same consisting in subjecting; the manganese steel scrap to fusing renmeratnrc in an nir-excl11ding furnace, and under H16 protection of a covering of slug; while providing iron at or above iiic level oi the slug. i Tlic iinproroment in the uri: of inoiting inunganoso steel scrap to produce manganese oiecl castings, lilo same consisting i subjcciing in? steel scrap to fusing temperature. with exclusion of nhnosplicre. and While henoafi-li u proicctivo (overing of slag, ungi surrounded by a Wall composed-in part of iron exposed upon i'llC: inner surface 01"" the Wall. inncd at OlliCrRQ'O Illinois, this 29th day of NOVI'IlbOR", 19252. l-VlFlSLiY NICHGLS.

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