| 摘要 |
HEAT TREATMENT OF METALS A metal less readily oxidisable than iron is annealed in an atmosphere that is formed by separating (in for example a pressure swing adsorption apparatus 2) nitrogen from air to form a gas mixture comprising at least 95% by volume of nitrogen and a minor proportion of oxygen impurity, and then reacting the oxygen impurity with hydrogen in a catalytic reactor 4. The resulting atmosphere, which is admitted to an annealing furnace 6, comprises nitrogen, hydrogen and water vapour.
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