You won't see this everyday, this a picture of the front and back of a tuyere water hose. A tuyere is the copper insert where the hot air goes into a blast furnace. Flame temp at the nose of the tuyere is 4000 degrees F. Which is why the tuyere is water cooled. One of the tuyeres failed, which happens and the iron burned a portion of the tuyere exposing the water channel. Normally water leaks into the furnace, this time iron came out. Actually quite minor as far as these things go.....I just thought it was kind of a cool pic, to see iron in a water hose.