Application of Statistical Quality Control Tools for Analyzing and Improving Rebar Manufacturing Processes: A Case Study of Zliten Iron and Steel Factory

The iron and steel industry is one of the fundamental pillars of economic development and infrastructure expansion. Rebar used to reinforce concrete structures, is a key product in this industry, where its quality plays a crucial role in ensuring structural safety and durability, necessitating continuous quality control. This study explores the application of Statistical Quality Control (SQC) techniques to improve the quality of rebar produced at the Zliten Iron and Steel Factory in Libya. Data related to rebar with a diameter of 14 mm, commonly used in concrete structures, were collected from production lines and analyzed using the Minitab software. The analyses involved the construction of X-bar and R control charts to monitor process variations and identify deviations that may indicate quality issues. The results revealed specific instances of process instability, and corrective measures were proposed to enhance product consistency. The study demonstrated that implementing SQC techniques could significantly improve product quality and reduce defects, aligning with both Libyan and international standards. The study recommends continuing the use of SQC tools and training staff to ensure the sustainability of quality improvements.