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flame hardening

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flame hardening

[′flām ‚härd·ən·iŋ]
(metallurgy)
A method for local surface hardening of steel by passing an oxyacetylene or similar flame over the work at a predetermined rate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
Flame hardening is the oldest method and, originally, was probably an extension of the use of welding techniques.
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Lippert explains that the new steel needs no flame hardening and so eliminates the localized soft spots that used to plague a die's flexible "hinge" and land areas.
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