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Over many years of authoring essays on metallurgy, there was one term that kept puzzling my audience again and again – blast furnace atmosphere. I have seen too many students who learned its definition by heart but could not explain its importance. At the same time, there were engineers who thought more about temperature than about the components of the atmosphere. The time has come to put things right with a clear Q&A. Q1: The atmosphere of the blast furnace is an atmosphere of gases. The blast furnace atmosphere is the atmosphere of gases in the inner part of the blast furnace during the iron-making process. The gas atmosphere consists of carbon monoxide, carbon dioxide, nitrogen, and minor amount of hydrogen. The atmosphere is artificially created to take oxygen out of the iron ore and create iron. Q2: What is the scientific name for the atmosphere in a blast furnace? This is a frequently seen test question. The technical term for blast furnace atmosphere is just reducing the atmosphere . In metallurgy