Знос гільзи кристалізатора в процесі експлуатації на виробництві
This paper presents the results of a study of the damageability and wear of mold sleeves of a section continuous casting machine (CCM) when casting in an industrial environment. Typically, wear occurs at the bottom of the wide wall at the farthest from the corners. The amount of steel poured through...
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| Datum: | 2023 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | Ukrainisch |
| Veröffentlicht: |
Physico-technological Institute of Metals and Alloys
2023
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| Online Zugang: | https://www.metalsandcasting.com/index.php/mcu/article/view/73 |
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| Назва журналу: | Metal and Casting of Ukraine |
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Metal and Casting of Ukraine| Zusammenfassung: | This paper presents the results of a study of the damageability and wear of mold sleeves of a section continuous casting machine (CCM) when casting in an industrial environment. Typically, wear occurs at the bottom of the wide wall at the farthest from the corners.
The amount of steel poured through the mold liner inevitably has an intense thermal and mechanical effect on it. And gradually the geometry of its inner working surface changes, as a result of which the quality of the continuously cast billet deteriorates and after a certain number of melts the sleeve has to be taken out of service. The reasons for the failure of a liner can be different and depend on a number of factors.
The authors of this article have tested several types of mold sleeves with different geometry of the working cavity. All sleeves were divided into 3 groups and the change in geometric dimensions and warpage of the sleeve walls were studied. For the purpose of objectification, the measuring system MCS-3000 was used.
As a result, all the liners were removed due to the appearance of defects that made their further full-fledged operation impossible, and significant differences in durability made it possible to trace the dynamics of their damageability and obtain data on various types of damage.
The research results showed that one of the reasons for the occurrence of areas of erosion is the insufficient adhesion strength of the chrome coating to the copper base. The areas of erosional destruction are associated with deep risks that penetrate deeply through the coating and the base material of the liner. It is also possible to associate the appearance of deep shells with ragged edges, close in shape to a circle, with violations of technology.
In turn, when using a multilayer sleeve manufactured by "Kobelco", the durability of 780 heats, with uniform wear of the corner regions in the sleeve, authors of the article did not observe wear on the edges of the sleeve.
These sleeves were operated without visible disturbances in the continuous casting process and showed an expected high durability.
Thus, it was concluded that, subject to the technology, it is possible to significantly increase the resource of the liners. And also, in addition to the direct technological process, the personnel play an important role, on whose negligence the service life of the liners also depends. |
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