US PATENT SUBCLASS 420 / 18
.~.~.~ Processes of adding magnesium

Current as of: June, 1999
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420 /   HD   ALLOYS OR METALLIC COMPOSITIONS

8  DF  FERROUS (I.E., IRON BASE) {24}
9  DF  .~ 1.7 percent or more carbon containing {2}
13  DF  .~.~ 2.7 percent or more carbon equivalent containing (i.e., cast iron) {7}
18.~.~.~ Processes of adding magnesium {7}
19  DF  .~.~.~.~> Adding magnesium as a liquid, vapor or as a solid agent entrained by gas (e.g., fluidized)
20  DF  .~.~.~.~> Flowing molten iron alloy onto solid magnesium containing agent, or adding solid magnesium containing agent to molten stream of iron alloy
21  DF  .~.~.~.~> Mechanically plunging magnesium containing agent below surface of iron alloy melt
22  DF  .~.~.~.~> Separate addition of plural agents, at least one containing magnesium
23  DF  .~.~.~.~> Magnesium containing agent is coated, impregnated, or compacted (e.g., briquetted, coated particles)
24  DF  .~.~.~.~> Magnesium present in agent only as a compound with a nonmetal
25  DF  .~.~.~.~> In agent also containing silicon, rare earth, or alkaline earth metal

DEFINITION

Classification: 420/18

Process of adding magnesium:

(under subclass 13) Processes of preparing an alloy or metallic composition wherein magnesium is added to the alloy or metallic composition.

(1) Note. The magnesium is usually added to cause carbon in the molten alloy to precipitate in spherical form, thus increasing the strength and ductility of the solid alloy, i.e., production of so called "nodular iron" or "spherulitic cast iron" etc.