How do you calculate rolling margin of steel?

To calculate the rolling margin of steel, first determine the theoretical weight of the steel based on its dimensions and density (typically around 7850 kg/m³ for mild steel). Next, measure the actual weight of the rolled steel product. The rolling margin is then calculated as the difference between the actual weight and the theoretical weight, expressed as a percentage of the theoretical weight. The formula is: ((\text{Actual Weight} - \text{Theoretical Weight}) / \text{Theoretical Weight} \times 100%).