The use of selected SPC tools in the analysis of the quality of pig iron

The main goal of the paper was to determine the importance of using statistical quality assessment tools used in SPC to optimize quality from the point of view of obtaining stable results that meet the requirements set by customers or technical documentation. The analysis of quality parameters of blast furnace pig iron produced by a selected production plant was carried out, in which selected SPC tools were used. The analysis used data from the output of the production process and concerning the quality of the finished product, i.e. metallurgical pig iron. The following parameters: content of Si, Mn, P, S, C and the temperature of the finished product were analysed. The analysis included results from tests from 36 consecutive calendar months. Control charts of average values and quality capability indices were used to evaluate selected quality parameters.

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