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Explanation: Although Cinefil-san's answer has much merit, I have not heard the term in metal processing before. May I suggest "continuous heating furnace" as a likely translation of this unusual Japanese word? "continuous heating furnace" has 2,45000 hits via Google, and is a term used frequently.
保 = maintain, preserve, keep etc.,加熱炉 = heating furnace (Jim Breen)
xxxDerek Newpor Local time: 19:34 Specializes in field Native speaker of: English