Study on Oxidation of Stainless Steels During Hot Rolling

Study on Oxidation of Stainless Steels During Hot Rolling

Z. Y. Jiang (University of Wollongong, Australia), D. B. Wei (University of Wollongong, Australia), K. Tieu (University of Wollongong, Australia), J. X. Huang (Baoshan Iron & Steel Co., Ltd., China), A. W. Zhang (Baoshan Iron & Steel Co., Ltd., China), X. Shi (Baoshan Iron & Steel Co., Ltd., China) and S. H. Jiao (Baoshan Iron & Steel Co., Ltd., China)
DOI: 10.4018/978-1-4666-1867-1.ch014
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The oxidation of stainless steels 304 and 304L during hot rolling is studied in this paper. Results show the oxide scale thickness decreases significantly with an increase of reduction, and the oxide scales of both 304 and 304L stainless steels were found more deformable than the steel substrate. Surface roughness shows a complicated transfer during the hot rolling process due to the complexity of oxide scale characteristics. Also, surface roughness decreases with an increase of reduction. The friction coefficient increases with reduction in all cases, and the increase is more significant in the case of the 304 stainless steel than that of 304L stainless steel.
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An electrical furnace was adopted for reheating. Hot rolling tests were carried out on a Hille 100 Experimental Rolling Mill. A computer was used for data collection using Lab Window Software. The rolls are 225mm diameter by 254mm wide, induction hardened to 65 - 70RC up to 2.5mm deep with an initial surface roughness of 0.4μm (Ra) (Sun, 2005). The samples after rolling were put into a cooling box connecting with nitrogen to prevent further oxidation. The surface roughness was measured by the Hommel Tester T1000, the detailed procedures can be found in (Wei et al., 2009a).

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