The key technical indicators of a steel rolling line cover multiple aspects and are crucial for evaluating line efficiency, product quality, and cost control. The following are some key indicators:
1. Output Indicators
Average Hourly Output: This indicator reflects the capacity of the rolling mill and the technical skills of the rolling mill workers. It refers to the average number of qualified products produced per hour by the rolling mill. The calculation formula is: Average Hourly Output (tons/hour) = Number of qualified products produced (tons) / Actual Operating Time (hours).
Calendar Operating Rate: This indicator reflects the utilization rate of the rolling mill equipment within a calendar period. It refers to the percentage of the rolling mill's actual operating time as a percentage of the calendar period. The calculation formula is: Calendar Operating Rate (%) = Actual Operating Time (hours) / Calendar Time (hours) × 100%.
2. Quality Indicators
Steel Qualification Rate: This indicator reflects the quality of technical operations and management during the production process. It refers to the percentage of qualified steel produced as a percentage of the total inspected steel volume. The calculation formula is: Steel Qualification Rate (%) = Qualified Steel Inspection Quantity (tons) / Total Steel Inspection Quantity (tons) × 100%.
Yield Rate: An indicator reflecting raw material utilization and production efficiency. Depending on the production process, the yield rate can be categorized as the yield rate from ingot to billet, the yield rate from billet to billet, and the yield rate from hot-rolled to cold-worked. The general calculation formula is: Yield Rate (%) = Qualified Steel Production (tons) / Raw Material Consumption (tons) × 100%.
Surface Quality: This includes the surface finish, color, presence of cracks, inclusions, and other defects on the strip.
Shape and Dimension Accuracy: This includes indicators such as thickness, width, and plate shape (such as crown, wedge shape, edge thinning, and straightness). These indicators have a significant impact on the subsequent processing and performance of the product.
Mechanical Properties: These include tensile strength, elongation, and other properties, reflecting the strength and plasticity of the steel.
3. Energy and Material Consumption Indicators
Unit Energy Consumption of the Steel Rolling Process: This refers to the amount of standard coal equivalent (TCE) of various fuels and power required to produce one ton of qualified steel. The calculation formula is: Unit Energy Consumption of the Steel Rolling Process (TCE) = Total Plant Fuel and Power Consumption - Waste Heat Recovery (TCE) / Qualified Steel Production (Tons).
Roller Consumption: This refers to the number of rollers required to produce one ton of qualified steel. The calculation formula is: Roller Consumption (TCE) = Roller Consumption (TCE) / Qualified Steel Production (Tons).
