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Flame Hardening

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					Flame Hardening
Definition: A surface hardening process in which heat is applied by a high temperature flame followed
by quenching jets of water. It is usually applied to medium to large size components such as large gears,
sprockets, slide ways of machine tools, bearing surfaces of shafts and axles, etc. Steels most suited have
a carbon content within the range 0.40-0.55%.

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: (hint...you can also link to these from the cascading menu on our main navigation bar
under Flame-Hardening Methods)

       Stationary flame hardening
       Progressive flame hardening
       Spin hardening
       Combination hardening

				
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posted:6/5/2010
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