Method for under-pressure carburizing of steel workpieces

Details Method for under-pressure carburizing of steel workpieces Method for under-pressure carburizing of steel workpieces

2003-07-02

2009-06-23

Wyszomierski, George (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

C148S223000

Reexamination Certificate

active

07550049

ABSTRACT:
The subject of this invention relates to method carburizing of steel products, mainly parts of machines, vehicles and every mechanical apparatus, in vacuum furnaces under reduced pressure and elevated temperature. The method of under-pressure carburizing of steel workpieces according to present invention relates to introduction of active nitrogen carrier during heating up of the load. Introduction of the active nitrogen carrier is terminated when the load reaches temperature required to start carburizing process; from this temperature the carbon carrier is added. Pressure in the furnace chamber during continuous or pulse introduction of the active nitrogen carrier should be maintained within the ranges from 1 to 500 mbar.

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Altena, H;“Niederdruck-Aufkohlung Mit Hochdruck-Gasabschreckung Verfahrenstechnik und Ergebnisse,” Haerterei Technische Mitteilugen, Carl Hanser Verlag. Munchen, DE, vol. 53, No. 2, pp. 93-101, (Mar. 1, 1998).

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