Study on the effect of the application of metallic alloys on continuous casting machine segment drive roller surface
Jeferson Iorio Tessari; Matheus Rodrigues Furlani; Henrique Severiano de Jesus; Estéfano Aparecido Vieira
Abstract
Continuous casting stands as the foremost method for globally solidifying steels. In the context of slab continuous casting machines (CCMs), drive rollers play a pivotal role and are typically forged from steel, with the prevalent use of the EN 42CrMo4 alloy in their manufacturing. However, despite its common usage, this alloy has proved inadequate for resisting severe wear conditions under high temperatures, especially when subjected to contact with the solidified slab (>1000 °C). As a common practice, more wear-resistant steels are used in these rollers through welding techniques, with martensitic ferritic steels frequently utilized for this specific purpose. This study aimed to scrutinize the microstructure and hardness profiles of two rollers subjected to a welding-based coating process, specifically the Submerged Arc Welding. Two ferritic martensitic stainless steels were analyzed. The first steel was a conventional DIN 8555 class UP 5-GF-45-C alloy, characterized by elevated Ni and low Cr content. In contrast, the second a DIN EN 14700 class T Fe8 steel, exhibited higher Mo and lower Ni content. The prepared specimens underwent comprehensive analysis, encompassing measurements of hardness profiles and assessment of microstructural characteristics. The results revealed a decreasing hardness profile close to the base material, exhibiting distinct gradients. Notably, the DIN EN 14700 class T Fe8 steel demonstrates a 33% higher average hardness (Vickers - HV0.5). The material structures were similar, both displaying the typical martensitic morphology. However, in the upper layer of the DIN EN 14700 steel, a microstructure with a relative degradation is observed. The differences in chemical composition caused this effect.
Keywords
Referências
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Submetido em:
12/09/2023
Aceito em:
22/07/2024
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