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Delta, OH, United States

Jones J.A.,Transfield Services Americas | McClanahan R.,North Star BlueScope Steel | Carraway K.,Superior Machine Co.
Iron and Steel Technology

This paper presents an analysis of the projected benefits of increasing the volume of the furnace bottom. The work was completed in 2010, and the actual achieved benefits are shown for comparison with the original projections. Source

Hoffman K.,North Star BlueScope Steel | Davis C.,North Star BlueScope Steel | Serrano E.,North Star BlueScope Steel
Iron and Steel Technology

The hot strip mill at North Star BlueScope Steel has been exploring options to increase the caster capacity to match the current capacity of the rolling mill. Slab thickness has already been increased, but it had some adverse effects on the reliability of the mechanical drivetrain components. Prior to further production increases, it was necessary to determine the current loads transmitted by the gear spindles on the roughing stands and evaluate the effect of increased torque on reliability. Due to the change in slab thickness, the extent of the gear spindle repairs has generally increased in complexity since 2005. To better understand the specifics of the repair trends, the inspection records for all four spindles used on roughing mill stand 1 (RI) from 1999 to 2011 were reviewed. The predominant expenses in those repairs were spindle roll sleeves that cracked and the secondary damage which occurred as a result. Source

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