BORON

(Chemical Symbol B)- Element N. 5 of the periodic system. Atomic weight 10.82. It is gray in color, ignites at about 1112?F and burns with a brilliant green flame, but its melting point in a non-oxidizing atmosphere is about 4000?F Boron is used in steel in minute quantities for one purpose only-to increase the harden ability as in case hardening and to increase strength and hardness penetration.