Abstract
Mechanisms of sticking phenomenon occurring during hot rolling of two ferritic stainless steels, STS 430J1L and STS 436L, were investigated in the present study. A hot-rolling simulation test was carried out using a high-temperature wear tester capable of controlling rolling speed, load, and temperature. The test results at 900 °C and 1000 °C revealed that the sticking process proceeded with three stages, i.e., nucleation, growth, and saturation, for the both stainless steels, and that STS 430J1L had a smaller number of sticking nucleation sites and slower growth rate than the STS 436L because of higher high-temperature hardness, thereby leading to less serious sticking. When the test was conducted at 1070 °C, the sticking hardly occurred in both stainless steels as Fe-Cr oxide layers were formed on the surface of the rolled materials. Thus, in order to prevent or minimize the sticking, it was suggested to improve high-temperature properties of stainless steels in the case of hot rolling at 900 °C to 1000 °C, and to establish appropriate rolling conditions and alloy compositions for ready formation of oxide layers in the case of hot rolling at higher temperatures than 1000 °C.
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Acknowledgments
This work was supported by the National Research Laboratory Program (Grant No. M10400000361-06J0000-36110) funded by the Korea Science and Engineering Foundation (KOSEF) and by POSCO under Contract No. PD-06903. The authors thank Dr. Yong Chan Suh and Mr. Joon Wook Park, Hyundai Steel Co., and Mr. Yong Joon Choi, POSCO, for their help in the hot-rolling simulation test.
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Manuscript submitted November 7, 2006.
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Son, CY., Kim, C., Ha, D. et al. Mechanisms of Sticking Phenomenon Occurring during Hot Rolling of Two Ferritic Stainless Steels. Metall Mater Trans A 38, 2776–2787 (2007). https://doi.org/10.1007/s11661-007-9312-5
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DOI: https://doi.org/10.1007/s11661-007-9312-5