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Spent a whole shift chasing a chill in a bronze pour that turned out to be a tiny crack in the ladle lining.
It took me and the furnace crew from the morning bell until after lunch to figure out why our metal kept cooling too fast, and we only spotted the hairline fracture during the cleanout.
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dakota_rodriguez7mo ago
Oh man, that "tiny crack in the ladle lining" is the worst. I mean, it's crazy how something you can barely see can mess up a whole pour. We had a similar thing happen with a leak in a riser sleeve once, just a pinprick. Spent hours checking temps and the charge, everyone getting stressed, and it was just this little defect bleeding heat. So frustrating.
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mila_jones396mo ago
My old crew chief called those "ghost leaks" because they mess with your head worse than the metal. Cleanest part is @joseph_lewis92 already nailed it with that bearing story, same principle just in a different spot. We had a 3/16ths pinhole in a tundish nozzle once, lost two full heats before someone finally saw the tiny drip pattern on the floor.
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joseph_lewis927mo ago
My buddy in a steel mill had a whole batch of plate come out brittle, and they tore the caster apart looking for the cause. It was a single, worn-out bearing in a secondary cooling zone they'd missed on the last inspection, just letting in a tiny bit of air. They lost a day's production over a fifty-dollar part.
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