Question

Increasing carbon content in steel, _________ ultimate strength and ____ ductility of steel.

1. increases, decreases
2. decreases, decreases
3. increases, increases
4. decreases, increases

Answer 1

Correct Answer - Option 1 : increases, decreases

Explanation:

Carbon steel is an alloy of iron and carbon.

As the carbon content increases:

1. The ultimate strength of steel increases.
2. The elongation before fracture decreases.
3. The ductility of the metal decreases.
4. Increasing carbon also reduces the weldability, especially above 0.25% carbon.
5. Plasticity and ductility are similar.

Generally, carbon is the most important commercial steel alloy. Increasing carbon content increases hardness and strength and improves hardenability.