Inter-pass Cooling System for Steel Plate Temperature Control
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Solution Overview
Problem
Traditional heavy plate rolling processes face challenges such as double bulging, edge overlap, low yield, poor temperature control, and microstructure homogeneity due to low deformation penetration and long intermediate holding times, leading to defects like lamellar tearing and poor properties in the thickness direction.
Innovation Solution
An on-line cooling system for controlled rolling with an inter-pass cooling process is introduced, where cooling equipment is integrated with the rolling mill, allowing for immediate cooling after each rolling pass, using a combination of water and air for temperature control, and pyrometers to detect and adjust temperature gradients, ensuring uniform cooling and deformation penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heavy plate rolling is used with long intermediate holding time, then the steel plate can be processed, but temperature control is poor and microstructure homogeneity is poor
Solution Approach 1:
The patent applies preliminary action by implementing inter-pass cooling before the steel plate enters the finishing mill. The cooling system cools the slab between roughing and finishing passes, preventing temperature rise during intermediate holding. This preliminary cooling action ensures the steel plate maintains appropriate temperature for subsequent finishing rolling, eliminating the need for long holding times and poor temperature control.
2Manufacturing precision
If traditional rolling with low deformation penetration is used, then rolling can be performed, but defects in the core region are difficult to eliminate
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the steel plate during rolling through inter-pass cooling. By lowering the temperature between passes, the material properties change, enabling better deformation penetration into the core region. This temperature control allows the rolling process to effectively eliminate core defects while maintaining manufacturing feasibility.
3Temperature
If laminar cooling equipment arranged far from rolling mill is used, then cooling can be performed, but it is very difficult to achieve large temperature gradient in thickness direction and precise control of plate temperature
Solution Approach 1:
The patent applies merging by integrating the cooling equipment directly with the rolling mill structure. The cooling system is positioned adjacent to the rolling mill, allowing simultaneous or coordinated rolling and cooling operations. This integration enables precise temperature control and large temperature gradients in the thickness direction while simplifying the overall equipment arrangement and reducing the distance between rolling and cooling zones.
4Reliability
If ultra heavy plate is rolled without effective cooling, then rolling can be performed, but lamellar tearing and poor property in thickness direction occur
Solution Approach 1:
The patent applies parameter changes by implementing temperature control through inter-pass cooling during the rolling of ultra-heavy plates. By reducing the temperature between passes, the material properties are optimized to prevent lamellar tearing and improve thickness direction properties. This temperature parameter control makes the rolling process feasible for ultra-heavy plates while ensuring high reliability of the final product.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances temperature homogeneity, grain refinement, and strength without sacrificing toughness, eliminating inner flaws and improving yield and productivity by synchronizing rolling and cooling processes.
Implementation Method 1
The cooling system comprises a header, control valves and a detecting instrument... The nozzles are arranged on the other end of the inlet pipe... to cool the plates on the transfer rollers
Implementation Method 2
water is used as the cooling material in the cooling process
Implementation Method 3
the plate temperature in length and width directions is detected by the pyrometers in real time
Data Source
AI summary
The present invention relates to controlled cooling in manufacture of steel plate, and in particular, to an on-line cooling system for controlled rolling with an inter-pass cooling process, which comprises a rolling mill and on-line cooling equipment. The cooling equipment is accessorily arranged on the exit of the rolling mill, so that the rolling mill and the cooling equipment are combined. One rolling mill and one set of on-line cooling equipment are considered a cooling group, and several such groups are connected in series, so the steel plate can be cooled in any rolling pass. In this invention, both the cooling system and the water supply system are arranged on the main frame, and the rolling process and the cooling process are synchronized by using inter-pass cooling. Consequently, satisfied rolling effect in the condition of a temperature gradient along the thickness direction, grain refinement at the surface and drastic strength improvement without sacrificing toughness are achieved. Besides, better quality of the plate center region is obtained, double bulging is avoided and the yield of steel plate is improved due to the higher deformation permeability.