Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

I. Yu. Mezin, Dr. Eng., Prof., Head of Dept. of Technologies, Certification and Service of Cars, E-mail: meziniy1@mail.ru
A. S. Limarev, Cand. Eng., Associate Prof., Dept. of Technologies, Certification and Service of Cars, E-mail: aslimarev@mail.ru
V. M Salganik, Dr. Eng., Prof., Dept. of Materials Processing Technologies
I. G. Gun, Dr. Eng., Prof., Dept. of Materials Processing Technologies

To increase the competitiveness of carbon steel grades in enterprises, it is necessary to constantly improve the production process. The manufacture of high-strength wire is an urgent area for the enterprises of the hardware industry. One of the most important indicators determining the quality of the wire is the achievement of the specified physical and mechanical properties and microstructure. To this end, the wire is subjected to patenting, which is carried out in special units. To achieve the desired result during patenting, it is necessary to choose and observe the correct regimes depending on the diameter of the wire being processed and the chemical composition of the steel. When developing the modes, it is taken into account that martensite and a significant amount of excess ferrite along the grain boundaries are not allowed in the structure of patented steel. In the course of the work, an analysis was made of the most common carbon wire patenting modes in production, statistical dependences of the designated heating modes of the wire billet and cooling medium on the parameters of the steel wire, namely, its diameter and carbon content in steel, were obtained. An assessment of its strength properties is also carried out. According to the results of the analysis of patenting modes, it was found that certain difficulties arise when mastering the process of patenting steel wires of thick diameters and a carbon content of more than 0.8. Therefore, the solution of issues related to the course of these processes seems to be an urgent task. The results of the studies show the possibility of ensuring the necessary level of mechanical properties of steel in billets of thick diameters during the implementation of the process using lead melt. The data obtained can serve as a starting point for industrial testing and the prospective development of patenting processes.

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