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US 6,187,111 B1Granted
Vacuum carburizing method
AssigneeNachi-Fujikoshi Corp.
InventorsMasaomi Waka, Toru Kadono, Satoshi Harai, Tetsuya Okada, Naoaki Imai
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Abstract
An improved vacuum carburizing method is provided which is easy to handle or to maintenance and low equipment costs without using hydrogen gas or acetylenic gas. The improved vacuum carburizing method comprises a carburizing treatment of workpieces made from steel material heated to about 900-1100° C. performed by introducing an ethylenee gas as a carburizing gas at a vacuum of 1-10 kPa in a carburizing furnace chamber.
Claims1
A method of carburizing steel workpieces consisting essentially of
- (a) placing the workpieces in a carburizing furnace chamber;
- (b) producing a vacuum of 1-10 kPa in the furnace chamber;
- (c) heating the workpieces to about 900-1100° C. in the furnace chamber and
- (d) introducing an ethylene gas as a carburizing gas in the furnace chamber.
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Dependencies are inferred from the claim text.