Methods and Procedures
for Flame Hardening
 715 E. Geer St. Unit A-4 | Durham, NC (USA) 27701 | Toll Free: 800.435.5312 | Tel: 919.956.5208 | Fax: 919.956.5057
Hardening the surface of metal components such as turbine blades, gears, shafts, rollers and camshafts is normally achieved in one of four ways:
  • furnace hardening (electric or gas)
  • thermo-chemical methods (carburizing/carbon-nitriding)
  • electric induction
  • flame hardening
The latter two methods involve short-duration, high-intensity heat applied on the selected area of the component, followed by quenching.  In addition to avoiding the need for a controlled atmosphere environment, these two methods also permit localized treatment, leaving the balance of the component at its original hardness level for further machining or finishing.

Flame hardening uses direct impingement of an oxy-gas flame onto a defined surface area.  The result of the hardening process is controlled by four factors:  the design of the flame head;  the duration of heating;  the target temperature to be reached;  and the composition of the metal being treated.  The process is also effective at preheating bars, strip and various contours prior to austnizing, forming and forging.

Flame Hardening Systems, Inc. manufactures a full range of equipment for efficently applying heat to a broad assortment of component parts.  Basically there are four methods/types of systems we build, depending on many factors.  Please follow these links for detailed information and descriptions of each major category: ( can also link to these from the cascading menu on our main navigation bar under Flame-Hardening Methods)

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