Re-carburising

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The crane has two hoists. The main hoist takes the weight of the ladle, the auxiliary hoist hauls on a shackle at the base of the ladle and controls the pour. Look carefully!

The blow has almost been completed, the air blast taken off and molten spiegel is being added. Steel has to have a small amount of carbon, the proportion having an effect on the steel's strength. Early steelmaking tried to halt the blow when the carbon level was just right but experience showed that it was better to burn the carbon out completely.

The quality of the steel produced would be poor if it absorbed too much oxygen and too little carbon so  spiegeleisen, a triple compound of iron, manganese and carbon was added (manganese combines readily with oxygen). The spiegel was melted in one of two cupolas nearby. A 10 ton capacity overhead crane is here pouring the spiegel into the mouth of the vessel. The crane has a main hoist for lifting the ladle and an auxiliary hoist for tipping it.

 

Slag pans and an empty iron ladle have been placed on bogies below the vessel. The ladle was moved by steel cable whilst the slag bogies were moved by an electric locomotive (out of view). The furthermost pan is full of red hot slag.

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