troostite
noun
a microconstituent of hardened and tempered steel, consisting of a very fine aggregate of ferrite and cementite.
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"Tempering" or "drawing" should be restricted to mean moderate reheating, up to about 350° C., forming troostitic steel.
From The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel by Fred H. (Fred Herbert) Colvin