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open-hearth furnace

British  

noun

  1. (esp formerly) a steel-making reverbatory furnace in which pig iron and scrap are contained in a shallow hearth and heated by producer gas

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Because it takes barely half an hour to cook a batch of LD steel, v. eight hours in the conventional, open-hearth furnace, the oxygen process melts the costs of labor, power and fuel.

From Time Magazine Archive

The process not only enables steelmen to cook a batch of steel in 40 minutes instead of six to ten hours in an open-hearth furnace but produces metal with fewer strength-sapping impurities as well.

From Time Magazine Archive

Don Nelson remembered a West Coast shipbuilder, Henry Kaiser, who had popped up nine months earlier with a project for building an open-hearth furnace on the Coast, had been gently waved aside.

From Time Magazine Archive

They said: "We'd like to see General Johnson walk up to an open-hearth furnace and get his summer pants scorched for $21.84 a week."

From Time Magazine Archive

On the other hand it can be used to produce very high-grade steel from cheap and impure metal, when it acts more like an open-hearth furnace.

From The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel by Fred H. (Fred Herbert) Colvin

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