Title: A new way to produce aluminised layer on austenitic refractory steel by electrolytic activated flux technique

Authors: Xinmin Luo, Yong Xu, Kangmin Chen

Addresses: School of Material Science and Engineering, Jiangsu University, 301 Xuefu Rd, Zhenjiang, Jiangsu 212013, PR China. ' School of Material Science and Engineering, Jiangsu University, 301 Xuefu Rd, Zhenjiang, Jiangsu 212013, PR China. ' School of Material Science and Engineering, Jiangsu University, 301 Xuefu Rd, Zhenjiang, Jiangsu 212013, PR China

Abstract: An aluminum diffuse-alloyed layer on the austenitic refractory steel Cr₃₀Ni₂₀NRE designed for electric radiant tubes was investigated. A thin pre-coated layer was first formed on the steel|s surface with the electrolytic activated flux technique. Thereafter, the austenitic steel was hot-dipped in the aluminum bath at 730°C for 5 min, and then diffuse treated at 960°C for 6 hours in an atmosphere containing NH₄Cl plus CeO₂. Finally, a dense diffused layer that had a good metallurgical combination with the steel substrate, accompanied by numbers of homogenously dispersed particle phase containing Cr and Si, was observed.

Keywords: austenite; chromium; refractory steel; electric radiant tubes; anti-carburising; electrolytic activated flux; coating; hot-dip; aluminising; diffusion; diffused layers.

DOI: 10.1504/IJMPT.2008.018028

International Journal of Materials and Product Technology, 2008 Vol.31 No.2/3/4, pp.314 - 325

Published online: 27 Apr 2008 *

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