Thin Slab Continuous Casting and Rolling Steel Strip
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Solution Overview
Problem
Current methods for producing hot-rolled steel strips, either conventional or shortened processes, face challenges in controlling solid solution and precipitation of carbon, nitrogen, and sulfide, leading to high costs and limited application scope, with conventional processes being costly and lengthy and shortened processes lacking control over temperature and deformation.
Innovation Solution
A method and system for thin slab continuous casting and rolling that involves continuously casting a molten steel into a thin slab, soaking and heating it to control temperature, descaling, and rolling it into a steel strip, using electromagnetic induction and laminar flow cooling to manage solid solution and precipitation, thereby reducing costs and improving process flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional process with thick slab is used, then solid solution and precipitation can be controlled, but production cost and equipment investment increase
Solution Approach 1:
The invention changes the slab thickness parameter from conventional thick slabs (≥120mm) to thin slabs (≤100mm), and modifies the heating temperature parameter to achieve solid solution (1150-1350°C) and controlled cooling. This parameter transformation allows the process to achieve the same metallurgical control effects with reduced equipment complexity and investment.
2Device complexity
If shortened process with thin slab is used, then production cost decreases, but control over solid solution and precipitation is lost
Solution Approach 1:
The invention applies preliminary soaking heating to thin slabs before rolling, raising the temperature to 1150-1350°C to achieve complete solid solution of carbon, nitrogen, and sulfide. This preliminary thermal action ensures that even with the shortened process and thin slabs, the metallurgical control of solid solution and precipitation is maintained, resolving the contradiction between process simplification and manufacturing precision.
3Loss of time
If thin slab without soaking is roughly rolled, then production time decreases, but temperature uniformity and deformation rate are insufficient
Solution Approach 1:
The invention implements preliminary soaking heating of thin slabs to 1150-1350°C before rough rolling. This preliminary thermal treatment ensures uniform temperature distribution throughout the slab cross-section, which in turn ensures uniform deformation rate during subsequent rolling. The soaking process eliminates temperature gradients that would otherwise cause uneven deformation, thus maintaining compositional stability while keeping production time short.
Solution Approach 2:
The invention maintains continuous heating and rolling operations without interruption. The thin slabs are continuously soaked, heated to solid solution temperature, and then immediately rolled without cooling in between. This continuous process ensures both temperature uniformity and consistent deformation rate throughout the production cycle, minimizing production time while maintaining material quality.
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
The method effectively controls the solid solution and precipitation of carbon, nitrogen, and sulfide, producing high-quality steel strips with a low-cost, flexible process, capable of producing a wide range of steel products, including those requiring controlled rolling and cooling, while reducing production costs and equipment requirements.
Implementation Method 1
soaking the thin slab from the directions of length, width and thickness so as to control the temperature of the thin slab between 980 and 1150° C. and make carbon, nitrogen and sulfide in a state of solid solution or precipitation
Implementation Method 2
heating the thin slab by electromagnetic induction for between 6 and 12 min so as to maintain the temperature; for a steel requiring an initial rolling temperature of between 1151 and 1350° C., heating the thin slab by electromagnetic induction for between 1 and 2 min
Implementation Method 3
cooled with laminar flow
Data Source
AI summary
A method for producing a wide steel strip using thin slab continuous casting and rolling by the following steps a) casting a molten steel into a thin slab having a thickness of between 50 and 90 mm; b) cutting; c) soaking; d) heating by electromagnetic induction; e) descaling; f) rolling; g) cooling with laminar flow; and h) coiling. The method can effectively control the solution and precipitation of carbon, nitrogen, and sulfide in steel with a low cost. The process is easy and flexible, and steel can be produced in a wide range of categories. Further provided is a system for producing a wide steel strip with thin slab continuous casting and rolling.