Other

Procedyne Corporation

Magna-tech P/m Labs.

Kenneth H Moyer

Thomas R Parr

Robert B Roaper

David J Geveke

The present invention is directed to a process for carburizing low alloy steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas consisting of an acetylene/hydrogen gas mixture in a ratio of from about 1:1 to about 1:10 at increased temperature disassociate the carbon from the gas and deposit it only on the surface of said steel and not on the surface of the furnace. The continued application of increased temperature at reduced pressure causes the deposited carbon to diffuse below the surface of the steel towards the core resulting in a carburized low alloy steel product with increased hardness, ductility and improved resistance to corrosion.

Low alloy steel carburization and surface microalloying process

A process for the high temperature carburization of steel comprising heating said steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas with hydrogen at partial pressure followed by a second diffusion cycle wherein the steel is further annealed for a time sufficient to allow for the additional deposition of from about 0.8% to about 3.0% m/o of said carbon onto the surface of said steel to permit the further migration of the carbon from the steel surface to the interior thereof.

Stainless steel carburization process

The present invention is directed to a process for tempering steel comprising carburizing said steel in a vacuum furnace in the presence of a hydrocarbon carburizing gas in combination with hydrogen wherein said carburizing gas/hydrogen combination is administered to the vacuum furnace by cyclically reducing the pressure in the furnace followed by the pulsed addition of the hydrocarbon carburizing gas consisting of an acetylene/hydrogen mixture is in a ratio of from about 1:1 to about 1:10 to replenish the air removed in the pressure reduction step.

Ferrous powder particles are coated with vaporized phosphorus in a fluid-bed reactor to obtain homogeneous coatings of phosphorus. The coated powders are useful feed for pressed structural parts, exhibiting improved green density, compressibility and sintered density thus improving magnetic and tensile properties.

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Cinnaminson, NJ, United States of America

Kenneth H Moyer