Carbonitration of a tool for pressing stainless steel pipes
To upgrade the operational stability of the tool at LLC “Karbaz”, Sumy, Ukraine, carbonation of tools and samples for research in melts of salts of cyanates and carbonates of alkali metals at 570–580 °C was carried out to obtain a layer thickness of 0.15–0.25 mm and a hardness of 1000–1150 НV. Tests...
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| Format: | Article |
| Language: | English |
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Sumy State University
2020-12-01
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| Series: | Журнал інженерних наук |
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| Online Access: | http://jes.sumdu.edu.ua/wp-content/uploads/2020/11/jes_7_2_2020_C17-C21.pdf |
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| author | Ivanov I. V. Mohylenets M. V. Dumenko K. A. Kryvchyk L. Khokhlova T. S. Pinchuk V. L. |
| author_facet | Ivanov I. V. Mohylenets M. V. Dumenko K. A. Kryvchyk L. Khokhlova T. S. Pinchuk V. L. |
| author_sort | Ivanov I. V. |
| collection | DOAJ |
| description | To upgrade the operational stability of the tool at LLC “Karbaz”, Sumy, Ukraine, carbonation of tools and samples for research in melts of salts of cyanates and carbonates of alkali metals at 570–580 °C was carried out to obtain a layer thickness of 0.15–0.25 mm and a hardness of 1000–1150 НV. Tests of the tool in real operating conditions were carried out at the press station at LLC “VO Oscar”, Dnipro, Ukraine. The purpose of the test is to evaluate the feasibility of carbonitriding of thermo-strengthened matrix rings and needle-mandrels to improve their stability, hardness, heat resistance, and endurance. If the stability of matrix rings after conventional heat setting varies around 4–6 presses, the rings additionally subjected to chemical-thermal treatment (carbonitration) demonstrated the stability of 7–9 presses due to higher hardness, heat resistance, the formation of a special structure on the surface due to carbonitration in salt melts cyanates and carbonates. Nitrogen and carbon present in the carbonitrided layer slowed down the processes of transformation of solid solutions and coagulation of carbonitride phases. The high hardness of the carbonitrified layer is maintained up to temperatures above 650 °C. If the stability of the needle-mandrels after conventional heat treatment varies between 50–80 presses, the needles, additionally subjected to chemical-thermal treatment (carbonitration) showed the stability of 100–130 presses due to higher hardness, wear resistance, heat resistance, the formation of a special surface structure due to carbonitration in melts of salts of cyanates and carbonates. |
| format | Article |
| id | doaj-art-ade75387caaa4b3f9fb50f27d0a2637c |
| institution | OA Journals |
| issn | 2312-2498 2414-9381 |
| language | English |
| publishDate | 2020-12-01 |
| publisher | Sumy State University |
| record_format | Article |
| series | Журнал інженерних наук |
| spelling | doaj-art-ade75387caaa4b3f9fb50f27d0a2637c2025-08-20T02:28:08ZengSumy State UniversityЖурнал інженерних наук2312-24982414-93812020-12-0172C17C2110.21272/jes.2020.7(2).c3Carbonitration of a tool for pressing stainless steel pipesIvanov I. V.0Mohylenets M. V.1Dumenko K. A.2Kryvchyk L.3Khokhlova T. S.4Pinchuk V. L.5Technical University of Varna, 1, Studentska St., 9010, Varna, Bulgaria“Karbaz” LLC, 122B, Kharkivska St,, 40024, Sumy, Ukraine“MetInservisGroup” LLC, 74, Krasnodons’ka St., 53200, Nikopol, UkraineNikopol Vocational College of the National Metallurgical Academy of Ukraine, 45, Karmelyuka St., 53210, Nikopol, UkraineThe National Metallurgical Academy of Ukraine, 4, Gagarina Ave., 49600, Dnipro, UkraineNikopol Vocational College of the National Metallurgical Academy of Ukraine, 45, Karmelyuka St., 53210, Nikopol, UkraineTo upgrade the operational stability of the tool at LLC “Karbaz”, Sumy, Ukraine, carbonation of tools and samples for research in melts of salts of cyanates and carbonates of alkali metals at 570–580 °C was carried out to obtain a layer thickness of 0.15–0.25 mm and a hardness of 1000–1150 НV. Tests of the tool in real operating conditions were carried out at the press station at LLC “VO Oscar”, Dnipro, Ukraine. The purpose of the test is to evaluate the feasibility of carbonitriding of thermo-strengthened matrix rings and needle-mandrels to improve their stability, hardness, heat resistance, and endurance. If the stability of matrix rings after conventional heat setting varies around 4–6 presses, the rings additionally subjected to chemical-thermal treatment (carbonitration) demonstrated the stability of 7–9 presses due to higher hardness, heat resistance, the formation of a special structure on the surface due to carbonitration in salt melts cyanates and carbonates. Nitrogen and carbon present in the carbonitrided layer slowed down the processes of transformation of solid solutions and coagulation of carbonitride phases. The high hardness of the carbonitrified layer is maintained up to temperatures above 650 °C. If the stability of the needle-mandrels after conventional heat treatment varies between 50–80 presses, the needles, additionally subjected to chemical-thermal treatment (carbonitration) showed the stability of 100–130 presses due to higher hardness, wear resistance, heat resistance, the formation of a special surface structure due to carbonitration in melts of salts of cyanates and carbonates.http://jes.sumdu.edu.ua/wp-content/uploads/2020/11/jes_7_2_2020_C17-C21.pdfneedle-mandrelmatrix ringpressingheat treatmentcarbonitration |
| spellingShingle | Ivanov I. V. Mohylenets M. V. Dumenko K. A. Kryvchyk L. Khokhlova T. S. Pinchuk V. L. Carbonitration of a tool for pressing stainless steel pipes Журнал інженерних наук needle-mandrel matrix ring pressing heat treatment carbonitration |
| title | Carbonitration of a tool for pressing stainless steel pipes |
| title_full | Carbonitration of a tool for pressing stainless steel pipes |
| title_fullStr | Carbonitration of a tool for pressing stainless steel pipes |
| title_full_unstemmed | Carbonitration of a tool for pressing stainless steel pipes |
| title_short | Carbonitration of a tool for pressing stainless steel pipes |
| title_sort | carbonitration of a tool for pressing stainless steel pipes |
| topic | needle-mandrel matrix ring pressing heat treatment carbonitration |
| url | http://jes.sumdu.edu.ua/wp-content/uploads/2020/11/jes_7_2_2020_C17-C21.pdf |
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