open hearth

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Definition of open hearth in English English dictionary: Describing a reverberatory furnace used to make high-quality steel; Designating the steel so produced
open-hearth process: a process for making steel using an open-hearth furnace
open-hearth process: or Siemens-Martin process Steelmaking technique that for most of the 20th century accounted for most steel made in the world. William Siemens made steel from pig iron in a reverberatory furnace of his design in 1867. The same year the French manufacturer Pierre-Émile Martin (1824-1915) used the idea to produce steel by melting wrought iron with steel scrap. Siemens used the waste heat given off by the furnace: he directed the fumes from the furnace through a brick checkerwork, heating it to a high temperature, and then used the same path to introduce air into the furnace; the preheated air significantly increased the flame temperature. The open-hearth process furnace (which replaced the Bessemer process) has itself been replaced in most industrialized countries by the basic oxygen process and the electric furnace. See also reverberatory furnace

open hearth

Hyphenation

o·pen hearth

ōpın härth

/ˈōpən ˈhärᴛʜ/ /ˈoʊpən ˈhɑːrθ/

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