Boron is a small interstitial element which is added to improve hardenability. It most effective in lower and medium carbon steels < 0.40% C. Boron increases the strength of heat-treated steels in the quenched and tempered condition. Boron steel grades can be hot worked using and direct quenched to achieve a high strength component. Boron steels are often used in applications subjected to wear.
Boron steel
