Title: Method of and apparatus for hardening workpieces of steel

Abstract: A method of and apparatus for hardening a workpiece of steel, according to hich the workpiece is heated, for instance in a furnace, to austenitizing temperature and is carburized by a pressurized mixture of purified air and propane surrounding the workpiece, whereupon the workpiece is quenched in a cooling region.

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Inventors: Kieferle, Wolfgang (Ravensburg, DT)

Application Number: 559247
Filing Date: 1975-03-17
Publication_date: 1977-02-01
Assignee: Hawera probst Kommanditgesellschaft Hartmetall-Werkzeugfabrik Ravensburg (Ravensburg, DT)
Primary Class(es): 148/233
Other Classes:
US Patent Ref:

2934330	Apr, 1960	Rusciano et al.	148/16.
2975083	Mar, 1961	Engelhard	148/16.
3185463	May, 1965	Daubersy	148/16.
3397875	Aug, 1968	Davis	148/16.
3413161	Nov, 1968	Goehring	148/16.

Other Refs: 524,362

Aug, 1940	UK

Primary Examiner: Satterfield, Walter R.
Assistant Examiner:
Attorney: Becker; Walter