Millwright Level 1 Practice Exam

What are the primary components of maraging steel?

1. Iron and carbon

2. Copper and zinc

3. Nickel, cobalt, and molybdenum

4. Steel and aluminum

The correct answer is: Nickel, cobalt, and molybdenum

Maraging steel is a high-strength steel alloy known for its exceptional toughness and ability to retain strength at high temperatures. The primary components of maraging steel include nickel, cobalt, and molybdenum, which contribute significantly to its unique properties. Nickel is the key alloying element, enhancing the alloy's strength and toughness, while cobalt further increases corrosion resistance and strength. Molybdenum aids in the hardening process of the steel and improves its high-temperature characteristics. This combination of elements results in a material that can be heat-treated to achieve high levels of strength without compromising ductility. The other combinations mentioned do not reflect the composition of maraging steel. Iron and carbon are common in traditional steels but lack the additional alloying elements that define maraging steel. Copper and zinc are not typically found in maraging steels; instead, they are more associated with brass or bronze materials. Similarly, the combination of steel and aluminum does not form maraging steel; rather, these components might be observed in other types of alloys or composites. Therefore, the blend of nickel, cobalt, and molybdenum is what specifically characterizes maraging steel, confirming its designation as a high-performance material.