Experimental Comparison of 90MnCrV8 and X153CrMoV12 Steels in MN Knife Mill for Wear Reduction

Abstract:

In this paper, the steels used in MN knife mills, which are used for plastic recycling, are investigated. 90MnCrV8 steel is commonly used in these mills, which will be replaced by X153CrMoV12 steel. The main goal of the presented contribution is to perform tribological tests and verify the wear rate of both steels experimentally with subsequent practical verification in the knife mill MN. Partial results relate to the analysis of hardness, roughness, and overall wear mechanism. A hardened steel ball of material G40 with a diameter of 4.76 mm was used as the contact material. The steel ball performed reciprocal linear motion on the surface of the experimental materials at room temperature and without the use of lubrication. The measurements were carried out in three-time intervals of 20, 30 and 40 min. The experimental material X153CrMoV12 can fully replace the material 90MnCrV8 in processes where its degradation occurs due to the friction mechanism. The material X153CrMoV12 showed significantly better results in all the values ​​we measured. It can be expected that the knife in the MN knife mill made of X153CrMoV12 steel will last several times longer in the working environment, which was also proven by practical verification in production.

• Periodical: Materials Science Forum (Volume 1151)
• Pages: 37-48
• DOI: https://doi.org/10.4028/p-Zxh33I
• Online since: June 2025
• Authors: Michal Krbat'a*, Marcel Kohutiar, Jana Escherová, Martin Bilka, Ľudmila Timárová, Patrik Klučiar, Róbert Janík, Jiří Macháček
• Keywords: Coefficient of Friction, Heat Treatment, MN Knife Mill, Steel, Wear

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