The paper presents the analysis of non-conformances of metal plates produced in one of Polish steelworks. Selected quality tools were used in the analysis. In the first part of the paper quantitative analysis of total and non-conforming production, taking into account the ways of procedure with non-conforming products, was made. In the second part of the paper the analysis of different types of non-conformances was done. Selected quality tools were used: Pareto’s chart, cause and effects analysis and FMEA method. The analysis covers the period of 1 calendar year.Keywords: non-conformance, quality analysis, Plate Mill, quality tools
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