Research and development of integrated short-process casting and rolling technology and equipment
1. Research Background and Overall Task Objectives
The steel industry, as a typical process industry, has complex production processes involving multiple stages and a long production line. During the development and production process, shortening the cycle, improving efficiency, reducing resource consumption and environmental pollution have become the core challenges for transformation and upgrading. Especially in the context of green and low-carbon transformation, achieving sustainable industrial development has been elevated to a national strategic priority. Traditional processes urgently need to be transformed through short-processification, intelligentization and green innovation. Among them, technological breakthroughs and process improvements in high-end material fields such as hot-rolled seamless steel pipes and special alloy thin strip casting have become important engines for enhancing industrial competitiveness and driving high-quality development of steel materials, providing key paths for solving industry pain points and supporting the upgrading towards low-carbonization.
This project focuses on the theme of "innovative green and low-carbon steel production technology". Leveraging the technical advantages of the short-process production process, it concentrates on three major areas: hot-rolled seamless steel pipes, thin strip casting rolling, and the preparation of special functional materials. A series of key technology research and application promotion are carried out. The overall task objectives include:
1) Online microstructure control short-process technology for hot-rolled seamless steel pipes: Through the innovation of online microstructure control technology, the problem of being unable to effectively control the microstructure and properties of materials in the traditional seamless steel pipe production process is solved. This enhances the strength, toughness and welding performance of the steel pipes, reduces production costs, and realizes the shortening and optimization of the production process.
2) Industrial Innovation and Application of Thin Strip Casting Technology: Promote the industrial application of thin strip casting technology. Through the optimization of the casting and rolling processes, achieve high-quality and high-efficiency production of steel strips such as silicon steel, and promote the wide application of high-end products in fields such as high-efficiency motors.
3) Preparation of Special Functional Materials: By fully leveraging the advantages of the twin-roll casting rapid solidification technology, the short-process technology of the steel industry has been transferred to the field of preparing magnetic nanomaterials urgently needed by the electronics industry, meeting the increasingly high demands for basic materials in the rapidly developing economy of our country.
2 Key common technical contents for solution
This project focused on two areas: hot-rolled seamless steel pipes and thin strip casting. It overcame a series of key common technical challenges. Through these technological innovations and breakthroughs, it not only provided strong technical support for the production in various specialized fields, but also promoted the process of the material industry's green and low-carbon transformation.
2.1 Online Process for Regulating the Microstructure of Hot-Rolled Seamless Steel Pipes with Short Circuits
Continuous casting core quality control technology for round billets
The quality defects such as central porosity and shrinkage cavities that occurred during the production of continuous casting round billets have been resolved. By appropriately installing pressing equipment at the designated positions on the continuous casting billet production line, and utilizing the temperature difference between the surface and the core of the continuous casting billet to perform moderate pressing deformation, the density of the core of the billet has been significantly improved, the central defects have been eliminated, and the quality of the final steel pipe has been enhanced. This has broken through the bottleneck in the traditional process for handling core defects of the cast billets.
2) Online Normalization High Uniform Cooling Technology
An efficient vapor-cooling nozzle structure with adjustable cooling speed at any level was developed, and an automated control system suitable for different product cooling requirements was constructed. This enabled precise control of the online solidification process, thereby enhancing production efficiency and product quality.
3) Online control cooling technology for hot-rolled seamless steel pipes
In response to the demand for large-diameter thick-walled pipeline steel, a solution combining online cooling and direct quenching technology was proposed, which enhanced the comprehensive mechanical properties of the steel pipes, especially in terms of anti-sulfur corrosion performance and high-temperature performance. This solution overcame the limitations of traditional cooling technologies.
2.2 Integrated and Controlled Technology for Thin Strip Continuous Casting and Rolling
The thin strip casting process directly solidifies molten metal into thin strip billets through the casting roller and then forms them through rolling. It replaces the traditional multi-step process, significantly shortening the production cycle and improving efficiency. By optimizing the structure of the casting roller and the rolling parameters, it overcomes technical challenges such as uneven crystallization and thickness fluctuations, ensuring high precision and quality stability of the products. Simultaneously, key process parameter control technologies are developed. The integrated systems for controlling strip shape, temperature uniformity, and precise adjustment of cooling rate are established. Through the coordinated control of temperature and pressure throughout the rolling-cooling process, the performance consistency of thin strip products is achieved, promoting the iterative upgrading of this technology towards higher specifications and higher quality.
2.3 Development of Nano-functional Powder Technology through Dual-Roll Liquid Rolling
To solve the technical challenges such as the efficient and continuous preparation of uniform functional nano-powders, the control of shape/diameter, and particle separation, especially in accordance with the strict size distribution requirements of 20-30nm, it is necessary to conduct in-depth development in aspects such as material composition calculation, amorphous formation design, continuous casting and rolling, and nano-crystal crystallization kinetics/thermodynamics.
3. Technical Route and Implementation Plan
This project has formulated a systematic technical roadmap based on hot-rolled seamless steel pipes and thin strip casting technology. According to the characteristics of each field, detailed implementation plans have been proposed.
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