The stir lances can inject either argon to stir the molten steel, or oxygen which reacts with aluminum added to the bath to create a temperature rise if the molten steel gets too cold to cast. The bath is around 3000 degress fahrenheit which is why the lance that has just been removed is glowing.
Some industrial shots from a steel mill that I am quite amazed at because they are jpgs and not from RAW. I could have gotten more out of them from RAW captures -- but this is more than I expect from a JPG. The shots have been tweaked in Lightroom.
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