Wear analysis of high chromium cast iron used for umbrella hat in  corrosion environment of hot strong alkali

doi:10.13251/j.issn.0254-6051.2020.05.051

Abstract

Abstract: Wear mechanism under working conditions of high chromium cast iron Cr28 and Cr20 conventionally used for umbrella hat in the alumina industry was analyzed. And the composition, microstructure and properties of the failed parts made of these materials were compared and studied. The results show that, when the umbrella hat are eroded under the condition of high temperature and strong alkali, the abrasion loss is decided collaboratively by the mechanism of micro-cutting and deformation abrasion. The high chromium cast iron Cr28 with the more content of Cr has better erosion and abrasion properties than that of Cr20 cast iron. The service life of umbrella hat is depended on the slurry and cast iron materials on its surface. After quenching and tempering, the matrix microstructure of the two tested materials is mainly composed by tempered martensite, M₇C₃ carbide and a small amount of retained austenite. And the contents of eutectic carbides in the high chromium cast iron Cr28 is higher and more dispersed distribution, the average hardness is 64.0 HRC, which is higher than that of 60.2 HRC of Cr20 cast iron. Finally, it is determined that the umbrella hat produced by high chromium cast iron Cr28 can meet the requirements of the alumina production and overhaul period of the equipment.

Key words: high chromium cast iron, umbrella hat, erosion and abrasion, strong alkali corrosion, ratio of Cr/C

CLC Number:

TG141

Huang Wei. Wear analysis of high chromium cast iron used for umbrella hat in corrosion environment of hot strong alkali[J]. Heat Treatment of Metals, 2020, 45(5): 266-271.

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Wear analysis of high chromium cast iron used for umbrella hat in corrosion environment of hot strong alkali

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