Abstract
In the present study, mechanisms of sticking that occurs during hot rolling of modified STS430J1L ferritic stainless steels were investigated by using a pilot-plant-scale rolling machine, and the effects of alloying elements on sticking were analyzed by the high-temperature oxidation behavior. The hot-rolling test results indicated that the Cr oxide layer formed in a heating furnace was broken off and infiltrated the steel, thereby forming Cr oxides on the rolled steel surface. Because the surface region without oxides underwent a reduction in hardness rather than the surface region with oxides, the thickness of the surface oxide layer favorably affected the resistance to sticking. The addition of Zr, Cu, and Ni to the ferritic stainless steels worked in favor of the decreased sticking, but the Si addition negatively affected the resistance to sticking. In the Si-rich steel, Si oxides were continuously formed along the interfacial area between the Cr oxide layer and the base steel, and interrupted the formation and growth of the Cr oxide layer. Because the Si addition played a role in increasing sticking, the reduction in Si content was desirable for preventing sticking.
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Acknowledgments
This work was supported by POSCO under a contract No. PD-06903. The authors would like to thank Drs. Yong Deuk Lee and Kwang Tae Kim of POSCO for their help in the hot-rolling test.
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Manuscript submitted February 9, 2011.
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Ha, D.J., Lee, J.S., Kim, N.J. et al. Effects of Alloying Elements on High-Temperature Oxidation and Sticking Occurring During Hot Rolling of Modified Ferritic STS430J1L Stainless Steels. Metall Mater Trans A 43, 74–86 (2012). https://doi.org/10.1007/s11661-011-0829-2
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DOI: https://doi.org/10.1007/s11661-011-0829-2