Final answer:
Carbon is the element added more than others to iron in the manufacture of steel, to enhance strength and durability, with typical content ranging from 0.04% to 2.5%.
Step-by-step explanation:
The element that is added more than others to iron in the manufacturing of steel is carbon. During the steelmaking process, iron is refined by removing impurities and adding certain elements to produce alloys with specific properties. While elements such as manganese, chromium, nickel, tungsten, molybdenum, and vanadium are added to enhance the steel's attributes, carbon is the most significant addition, typically ranging from 0.04% to 2.5%. This addition of carbon is crucial as it significantly alters the iron's properties, making it stronger and more durable; however, excessive carbon must be removed to prevent the steel from becoming brittle.