Optimizing operational effectiveness while maintaining product quality is essential in the changing steel companies. This study explores Total Productive Maintenance (TPM) in the context of steel production, highlighting how it contributes to increased Overall Equipment Efficiency (OEE) by removing inefficiencies. The most significant losses, mostly Chemistry/Scrap and a few others, are identified by PARETO analysis. This research uses in-depth analysis of the steel manufacturing process to not only identify significant causes of total delays and faults but also to identify the root causes with countermeasures of significant losses using the WWBLA (Why-Why Because Logical Analysis) method. The countermeasures found in the WWBLA have reduced overall delays and total faults, resulting in an increase in OEE from 79.5% to 80.5%. This study emphasizes the importance of TPM as an important tool for improving productivity, sustainability, and competitiveness in the steel manufacturing industry by integrating it with structured analytical methods.