Further treatment may add controlled amounts of carbon, allowing various kinds of heat treatment (e.g. "steeling").
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Use of sponge iron Sponge iron is not useful in itself,
1, but can be processed to create wrought iron. The sponge is removed from the furnace, called a bloomery,
2,and repeatedly beaten with heavy hammers and folded over to remove the slag, oxidise any carbon or carbide 3,and weld the iron together. This treatment usually creates wrought iron .
Update Date:2011/10/17 4:25:20