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Bot GPT 3.5 The iron produced in the blast furnace, known as pig iron, contains impurities such as carbon, silicon, and phosphorus. These impurities can weaken the iron and make it brittle, which is not ideal for structural applications like building bridges.
Therefore, the pig iron must undergo further treatment to remove these impurities and strengthen the iron. This process is known as refining or conversion of pig iron into wrought iron. This involves remelting the iron and adding controlled amounts of carbon and other elements to improve its strength, ductility, and toughness.
Once the iron has been refined, it is known as steel, which is a much stronger and more durable material than pig iron. Steel is commonly used in construction for its high strength-to-weight ratio, excellent structural integrity, and resistance to corrosion.
Therefore, the iron produced in the blast furnace must be given further treatment to ensure that it meets the necessary strength and quality standards required for building bridges and other structural applications.