Measurements of Quality - Signals of Change

摘要

Metal processing systems can often be described in terms of a series of metallurgical reactors linked together by a number of transfer operations. There is good evidence from plant observations that quality achieved within one reactor can be lost during transfer to the next. These aspects will be discussed with reference to measurements of reoxidation and the influence of the surface-active elements oxygen and sulphur on the absorption of nitrogen and hydrogen by molten steel. An important consideration with respect to metallurgical processing is the availability of appropriate sensors that will detect signals pertaining to product quality. Two examples are presented of recent developments in this area, an FeO determinator for the characterization of slag behaviour and an ultrasonic sensor for the on-line monitoring of molten metal cleanliness.