Question

A 10 mm steel drill rod was heat treated and ground. What is the purpose of heat treating the drill rod?

1) To increase the hardness of the drill rod
2) To decrease the hardness of the drill rod
3) To improve the toughness of the drill rod
4) To make the drill rod resistant to corrosion

Answer 1

Heat treating the drill rod increases its hardness.

Step-by-step explanation:

The purpose of heat treating the drill rod is to increase the hardness of the drill rod. Heat treating involves subjecting the steel rod to high temperatures and then cooling it rapidly. This process changes the internal structure of the steel, making it harder and more resistant to wear and deformation.