HEINE SCHNEEBELI / SCIENCE PHOTO LIBRARY HEINE SCHNEEBELI / SCIENCE PHOTO LIBRARY
Steel production: an electric arc furnace being charged with molten iron, prior to producing steel. The iron is produced in a blast furnace, and is carried to this point in a vast 'ladle'. Once inside the arc furnace, the molten iron has minerals added to it to introduce traces of other metals such as manganese and phosphorus. This, in addition to careful control of the ammount of carbon in the steel, determines the physical properties of the end product.
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