Characteristics of oxide scale formed on ferritic stainless steels in simulated reheating atmosphere

Authors

Xiawei Cheng, University of WollongongFollow
Zhengyi Jiang, University of WollongongFollow
Dongbin Wei, University of Technology, SydneyFollow
Jingwei Zhao, University of WollongongFollow
Brian J. Monaghan, University of WollongongFollow
Raymond J. Longbottom, University of WollongongFollow
Laizhu Jiang, Baoshan Iron and Steel

RIS ID

95214

Publication Details

Cheng, X., Jiang, Z., Wei, D., Zhao, J., Monaghan, B. J., Longbottom, R. J. & Jiang, L. (2014). Characteristics of oxide scale formed on ferritic stainless steels in simulated reheating atmosphere. Surface and Coatings Technology, 258 257-267.

Abstract

The aim of this study is to optimise the stainless steel oxidation behaviours during hot rolling. The high temperature oxidation behaviours of ferritic stainless steels B443NT and B445J1M were studied over the temperature range from 1000 to 1150 °C in a humid atmosphere containing 18% water vapour, as measured by a thermogravimetric analyser (TGA). The results indicate that breakaway oxidation occurs at 1090 °C for the B443NT steel, which is 60 °C lower than that for the B445J1M steel. The occurrence of iron oxide nodules on the steels marks the onset of breakaway oxidation; however, the breakaway oxidation phenomenon of B445J1M is different from that of B443NT due to a compact and continuous Mn-Cr spinel which is formed on the surface of B445J1M. The oxide nodules with regenerated Cr2O3 scale underneath the Fe-Cr spinel display better adhesion without showing pores at the metal-scale interface.