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本文主要就退火操作过程中冷却区的气氛要求和难题提出了建议。如果在原先加热操作过程中由于保护气体不纯或者马弗罩渗漏使气氛中的氧超过10PPm,那么就能形成氧化铁。如果箱式退火操作过作中最后气氛的露点和氮势足够低,那么后来氧化铁将被还原。然而,铜在操作中早期过度氧化能导致退火板、卷形成灰白色表面(被还原的铁)。在一些工厂进行“延迟驱气”退火操作时,直到加热操作的后期才引入保护性气体;而带卷外表面的氧化由于最初与马弗罩内存在的空气量而受到限制。已证明这种操作对防止钢因机油残余物分解而渗碳是有益的,这估计可能是由于油或者是碳与退火
In this paper, we mainly put forward suggestions on the atmosphere requirements and difficulties in the cooling zone during the annealing operation. Iron oxide can form if the oxygen in the atmosphere exceeds 10 ppm due to impure shielding gas or muffle leakage during the original heating operation. If the dew point of the last atmosphere and the nitrogen potential are sufficiently low during the box anneal operation, the iron oxide will be reduced later. However, excessive oxidation of copper in the early stages of operation can result in annealed sheets that form an off-white surface (reduced iron). In some plants for “retarded” annealing operations, protective gas was not introduced until the end of the heating operation; the oxidation of the outer surface of the coil was limited by the amount of air initially present in the muff housing. It has proved beneficial to prevent carburizing of steel due to decomposition of the oil residues, which may be due to oil or carbon and annealing