In the paper, the quality research of the steel bars produced by chosen Polish metallurgical enterprise was presented. The chemical composition of the steel grade 1006 produced in this enterprise was determined. Using the principles of Statistical Process Control (SPC), measurement uncertainty based on validated research methods and current spectral analysis of the control samples were also determined. Thanks to the use of this method it will be possible to take preventive action to eliminate errors during the technological process.Keywords: Steel bars, Statistical Process Control, homogeneous of chemical composition
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