Manganese is added in low carbon steel to

Low carbon steel is a basic type of steel, and adding alloying elements like manganese changes its properties to improve performance for different applications.

1. Makes steel tougher and harder (Option A):

Manganese increases the hardness of steel, helping it resist wear, scratches, and deformation more effectively.

It also improves toughness, which means the steel can absorb energy and withstand shocks without breaking easily.

2. Raises the yield point (Option B):

The yield point is the stress level at which steel starts deforming permanently.

Manganese strengthens the steel structure, allowing it to withstand higher stress before permanent deformation occurs, thereby increasing the yield strength.

3. Improves ductility and bending qualities (Option C):

Ductility means the steel can be stretched or shaped without cracking or breaking.

Manganese combines with sulfur impurities to form manganese sulfide, reducing brittleness caused by sulfur.

This improves the steel’s bending ability, formability, and overall workability.

Since manganese contributes to hardness, toughness, higher yield strength, and improved ductility, all the given statements are correct.

Therefore, Option D: All of the above is the correct answer.