Which of the following raw materials is required in the largest quantity in the manufacture of Steel?

The correct answer is Coal.

Important Points

To manufacture one tonne of steel, the following are needed:

• 8 tonnes of coal
• 4 tonnes of iron ore
• 1 tonne of limestone. So, option 1 is correct.

Key Points

• Steelmaking is the process of producing steel from iron ore and scrap.
• In steelmaking, impurities such as nitrogen, silicon, phosphorus, sulfur, and excess carbon are removed from the raw iron.
• Alloying elements such as manganese, nickel, chromium, and vanadium are added to produce different grades of steel.

• Limiting dissolved gases such as nitrogen and oxygen, and entrained impurities (termed "inclusions") in the steel is also important to ensure the quality of the products cast from the liquid steel.