Coupled with the brick developments and new zoning designs, technology changes in steel-making practices, in particular, implementation of slag-splashing technology to coat of the BOF bottoms and walls between heats and the introduction of secondary ladle metallurgy, have succeeded in extending BOF lining life into the high thousands and tens of thousands. Currently, BOF high-wear trunnions are lined with resin-bonded magnesia-carbon brick containing 15 wt.% high-purity graphite