Boriding can be achieved in several ways, but commonly the metal piece is packed with a boriding mixture and heating at 900 °C. Typical boriding mixture consists of boron carbide powder diluted with other refractory materials. The process converts some of the Fe to iron boride, consisting of two phases: FeB concentrated near the surface, and diiron boride (Fe 2 B). Boride layer depths can range from 0.001 - 0.015 inches (25.4 - 38 μm) depending on base material selection and treatment.