Effects of Alloying Elements on High-Temperature Oxidation and Sticking Occurring During Hot Rolling of Modified Ferritic STS430J1L Stainless Steels |
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Authors: | Dae Jin Ha Jong Seog Lee Nack J Kim Sunghak Lee |
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Affiliation: | (1) Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea;(2) Research Planning Group, Technical Research Lab., POSCO, Pohang, 790-785, Korea;(3) Graduate Institute of Ferrous Technology, Pohang, Korea;(4) Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Korea; |
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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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