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 requirements for basic materials in the rapid economic development 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 a Short Closed-loop System 

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 processing bottleneck for core defects in traditional processes. 

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 cooling requirements of various products 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