Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia
A. V. Markevich, Cand. Eng., Associate Prof., Dept. of Foundry Productoin and Materials Science, e-mail: artem.markevich@bk.ru
M. A. Polyakova, Dr. Eng., Prof., Dept. of Material Processing, e-mail: m.polyakova@magtu.ru
Yu. A. Izvekov, Dr. Eng., Prof., Head of the Dept. of Applied Mathematics and Computer Science, e-mail: yurij.izvekov@mail.ru
I. M. Potapov, Bachelor, Dept. of Metallurgy and Chemical Engineering, e-mail: potapivan14@gmail.com

Abstract: In the conditions of present-day metallurgical manufacturing process the task to ensure metal product quality is of high actuality. It is necessary to ensure the competitiveness of the industrial enterprise. Due to this the non-destructive methods of control are used on all stages of the metal wear manu facturing process. Hot rolled steel sheet is manufactured in a wide range of dimensions, which it is necessary to take into consideration when choosing the kind of non-destructive testing. The significance of correct choice of the flaw detection equipment to control internal defects of hot-rolled metal products depending on its thickness and peculiarities of the steel sheet finishing technological line is emphasized. Application of noncontact insertion of ultrasonic wave for hot-rolled sheet with 2-25 mm in thickness after coil cutting is described. Both contact and non-contact modes to insert the ultrasonic wave can e used for hot-rolled steel sheet with 8-50 mm in thickness after cutting depending on the technological peculiarities of steel finishing line. For steel sheet with 50-160 mm in thickness, when the capacity of the equipment of technological line does not make it possible to ensure the necessary values of dimensions and gas-oxygen cutting is used for steel sheet, the powerdriven ultrasonic testing to control internal defects is described. To define the object of control, the concept of “unit of production” was defined, which makes it possible to identify hot-rolled metal depending on its size as hot-rolled sheet, hot-rolled sheet after cutting the sheet and hot-rolled sheet after cutting the coil. The main internal defect of flat hot-rolled metal products - discrepancy in continuity class - is reviewed. It is shown that ultrasonic testing is used as a non-destructive testing to determine the properties of metal products for various purposes. The results of non-destructive testing for rolled pipe steel during 2022-2023 years are presented. It is shown that visual measurement testing is effective to detect surface defects. These defects can be removed by mechanical treatment. To detect internal discontinuities, the ultrasonic testing is effective. The use of automated control equipment makes it possible to integrate the received data about defects in rolled metal products into the overall manufacturing management system.This is the basis to develop and make decisions to eliminate the origins of causes for appearance of defects of various nature during all stages of the rolled metal manufacturing technological process.

1. Flossdorf F. J., Geisler S., Wieland H. J. The importance of the material steel for the customers of the steel industry. Chernye Metally. 2009. No. 10. pp. 46–54.
2. Logunova O. S., Andreev S. M., Garbar E. A., Markevich A. V., Nikolaev A. A. Automation of scientific research of discontinuity of a flat surface: design solution of a hardware and software complex. Elektrotekhnicheskie sistemy i kompleksy. 2020. No. 1 (46). pp. 54–59.
3. Ermolov I. N., Lange Yu. V. Non-destructive testing: reference book. In 7 volumes. Under the general editorship of Klyuev V. V. Volume 3: Ultrasonic testing. Moscow : Mashinostroenie, 2004. 864 p.
4. Hübschen G. Ultrasonic techniques for materials characterization. Materials Characterization Using Nondestructive Evaluation (NDE) Methods. Woodhead Publishing, 2016. pp. 177–224.
5. Rajendran S. S., Indimath S. S., Sriniwasagan B., Dutta M., Pandit A. Ultrasonic based nondestructive testing technique for predicting shape defects in rolled steel sheets. ISIJ International. 2019. Vol. 59, Iss. 1. pp. 93–97.
6. Xiaolong S. Application of ultrasonic non-destructive testing in industrial pipeline inspection. Applied Mathematics and Nonlinear Sciences. 2024. Vol. 9, Iss. 1. pp. 1–16.
7. Fan Z., Bai K., Chen C. Ultrasonic testing in the field of engineering joining. The International Journal of Advanced Manufacturing Technology. 2024. Vol. 132, Iss. 9-10. pp. 1–26.
8. Kudryavtsev Y., Kleiman J., Gushcha O., Smilenko V., Brodovy V. Ultrasonic technique and device for residual stress measurement. SEM X International Congress & Exposition on Experimental and Applied Mechanics. Costa Mesa, California, USA. June 7–10, 2004. 7 p.
9. Saponaro A., Nobile R. In situ fatigue damage monitoring by means of nonlinear ultrasonic measurements. Metals. 2024. Vol. 14, Iss. 1. p. 11.
10. Yan X., Wang H., Fan X. Research progress in nonlinear ultrasonic testing for early damage in metal materials. Materials. 2023. Vol. 16, Iss. 6. p. 2161.
11. Holdsworth S. Creep-fatigue failure diagnosis. Materials. 2015. Vol. 8, Iss. 11. pp. 7757–7769.
12. Shchennikova V. A., Markevich A. V. Non-destructive testing of the macrostructure of hot-rolled products instead of destructive testing. Tekhnologii metallurgii, mashinostroeniya i materialoobrabotki. 2023. No. 22. pp. 135–141.
13. Pavros S.K., Sidorenko I.G., Rokshtro B. Comparative detection of planar extended defects of sheet metal products by reflection and transmission methods. Izvestiya vuzov Rossii. Radioelektronika. 2019. Vol. 22. No. 6. pp. 75–83.
14. Smith J., Johnson R. Advances in ultrasonic testing of hot-rolled products. Materials Evaluation. 2020. Vol. 78, Iss. 5. pp. 34–40.
15. Bersenev S. P., Slobtsova E. M. The state of non-destructive testing of metal products for transport purposes in JSC EVRAZ NTMK. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii. 2020. Vol. 76. No. 6. pp. 586–590.
16. Markevich A. V., Shchennikova V. A. Methods and standards of ultrasonic testing of hot-rolled products for the purpose of identifying internal defects. Tekhnologii metallurgii, mashinostroeniya i materialoobrabotki. 2022. No. 21. pp. 54–64.
17. Markevich A. V., Shchennikova V. A., Loshkarev M. A., Chernov V. P. Ultrasonic testing of the macrostructure of hot-rolled products. Aktualnye problemy sovremennoy nauki, tekhniki i obrazovaniya. 2023. Vol. 14. No. 1. pp. 33–35.
18. GOST R 56542–2019. Non-destructive testing. Classification of types and methods. Introduced: 30.10.2019.
19. GOST 22727–88. Rolled sheet. Ultrasonic test methods. Introduced: 09.02.1988.
20. Vilchinskaya N. A., Klass S. V., Belaya V. A. Ultrasonic testing of the macrostructure of continuously cast billets. Stal. 2007. No. 8. pp. 37–38.
21. Pavros S.K. Natural defects of metallurgical production. V mire nerazrushayushchego kontrolya. 2004. No. 3. pp. 2–5.
22. Golovatenko A. V., Konovalov A. N., Polevoy E. V., Mamontov M. M., Yunusov A. M. On the influence of conditional defects detected by ultrasonic testing on the consumer properties of rails. Stal. 2019. No. 7. pp. 72–74.
23. Shabalov I. P., Morozov Yu. D., Efron L. I. Steels for pipes and building structures with improved performance properties. Moscow : Metallurg, 2003. 519 p.
24. Markevich A. V., Polyakova M. A. Application of non-destructive testing methods to detect defects in hot-rolled metal products. Izvestiya Tulskogo gosudarstvennogo universiteta. Tekhnicheskie nauki. 2024. Iss. 3. pp. 285–291.
25. Brown L., White T. New automated solutions for ultrasonic inspection of large steel plates. NDT&E International. 2019. Vоl. 108. pp. 22–28.
26. Vanhille C., Valdecantos C. New system for ultrasonic inspection of steel plate. Proceedings of the 7^th European Conference on Non-Destructive Testing, 26–29 May 1998. 331 p.
27. Shefer O. Yu. Experience in mastering automated ultrasonic testing systems for metal products. Sovershenstvovanie tekhnologii v OAO “MMK“. 2011. Iss. 16. pp. 449–454.