In‐depth oxide scale growth analysis of B and Ti microalloyed AISI 304 in oxygen‐containing furnace atmospheres and CH₄ burn‐simulating furnace atmospheres
Laukka, Aleksi; Heikkinen, Eetu-Pekka; Fabritius, Timo (2018-11-30)
Laukka, A., Heikkinen, E. and Fabritius, T. (2019), In‐Depth Oxide Scale Growth Analysis of B and Ti Microalloyed AISI 304 in Oxygen‐Containing Furnace Atmospheres and CH4 Burn‐Simulating Furnace Atmospheres. steel research int., 90: 1800447. doi:10.1002/srin.201800447
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Laukka, A. , Heikkinen, E. and Fabritius, T. (2019), In‐Depth Oxide Scale Growth Analysis of B and Ti Microalloyed AISI 304 in Oxygen‐Containing Furnace Atmospheres and CH4 Burn‐Simulating Furnace Atmospheres. steel research int., 90: 1800447, which has been published in final form at https://doi.org/10.1002/srin.201800447. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019040911571
Tiivistelmä
Abstract
The effects of boron and titanium microalloying on scale‐layer formation and structure on AISI 304 austenitic stainless steel are studied. The research is focused on a steel slab’s oxide scale formation in a reheat furnace prior to hot rolling. The studied boron microalloying amounts are 7, 35, and 55 ppm and the studied titanium microalloying amounts are <100 and 400 ppm. In‐depth temperature and atmosphere tests span from 1100 to 1300 °C for an O₂‐containing atmosphere and 1100 to 1250 °C in an H₂O‐containing atmosphere, both using 25 °C increments. Research shows that microalloying 55 ppm B reduces scale growth at above 1175 °C in an H₂O atmosphere, all microalloying elements show significant scale growth reduction at 1175 °C in an O₂ atmosphere, microalloying 35 and 55 ppm B increases scale growth amounts at above 1225 °C in an O₂ atmosphere, while microalloying 400 ppm Ti reduced it. The inhibiting effect on scale growth that results from boron microalloying is tied to silicon oxide infiltration of the steel substrate.
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