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flame-harden

transitive verb
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Definition of flame-harden

: to harden (a ferrous alloy) by heating above the transformation temperature and then cooling as rapidly as necessary

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“Flame-harden.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flame-harden. Accessed 17 Jun. 2021.

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