US PATENT SUBCLASS 75 / 507
.~.~.~.~ Melting Iron(Fe) or treating molten Iron

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
392  DF  .~ Producing or treating free metal {10}
414  DF  .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
433  DF  .~.~.~ Iron(Fe) {18}
507.~.~.~.~ Melting Iron(Fe) or treating molten Iron {12}
508  DF  .~.~.~.~.~> Vacuum treatment of molten Iron(Fe) {3}
513  DF  .~.~.~.~.~> In reverberatory furnace (e.g., open-hearth, Siemens-Martin, puddling, etc.) {9}
524  DF  .~.~.~.~.~> Sequential treatment of molten Iron(Fe) in plural apparatus with different linings (e.g., acid Bessemer followed by basic Bessemer, etc.)
525  DF  .~.~.~.~.~> Impinging free falling molten metal stream or spray with a gas or solid agent or spraying (e.g., atomizing, etc.) of molten metal
526  DF  .~.~.~.~.~> Adding solid treating agent in form of wire, rod, or article with surface feature or in container or by plunging means
527  DF  .~.~.~.~.~> In rotary kiln (e.g., Kaldo process, etc.)
528  DF  .~.~.~.~.~> Injecting gas or nonmetalliferous liquid which gasifies into, onto, or through premelted Iron(Fe) or slag layer thereon {5}
560  DF  .~.~.~.~.~> Treating premelted Iron(Fe) or slag layer thereon by adding solid agent, slag, or flux {9}
571  DF  .~.~.~.~.~> Melting solid Iron(Fe) {4}
582  DF  .~.~.~.~.~> Separating slag from molten Iron(Fe)
583  DF  .~.~.~.~.~> Stirring or agitating molten Iron(Fe)
584  DF  .~.~.~.~.~> Pouring or tapping molten Iron(Fe)

DEFINITION

Classification: 75/507

Melting Iron (Fe) or treating molten Iron:

(under subclass 433) Process wherein a metal that contains over 50 percent by weight Iron (Fe) is melted or is treated in the molten state (e.g., to purify it or to improve its properties, etc.).

(1) Note. The solid Iron which is melted or the molten Iron which is treated is predominately (over 50 percent) in the elemental state at the start of the process. The "reduction"

subclasses above take processes wherein a charge which is predominately an Iron compound is reduced to the metallic state. This and indented subclasses, however, will take a process of melting or treating a charge which is predominately metallic Iron even though some incidental reduction of an Iron compound takes place (e.g., melting rusty scrap with reduction of the rust, treating pig Iron of high Carbon content with Iron oxide whereby the Iron oxide oxidizes the Carbon and is reduced to metallic Iron, etc.) as long as less than 50 percent of the Iron in the final product is produced by the incidental reduction.

(2) Note. This and indented subclasses will take a process of removing a component from an Iron alloy to make another alloy.

SEE OR SEARCH THIS CLASS, SUBCLASS:

433, for a process of preheating Iron (e.g., preheating scrap for later melting, etc.).

SEE OR SEARCH CLASS

148, Metal Treatment, appropriate subclasses for processes of treating solid or semi-solid metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical properties of metal. See Class 148, 512, for processes of surface melting of the solid or semi-solid metal. However, if metal casting, metal fusion, machining or working is involved, there is a requirement of significant heat treatment as described in section III, A, of the Class 148 definition.

420, Alloys or Metallic Compositions, for a process of making an alloy by melting the ingredients together.