Pure lanthanum has very few applications being almost limited to the scientific research. In spite of this, the metallurgical industry is the only commercial domain where the metal finds application. Lanthanum is sometimes added to other elements such as sulfur, oxygen and hydrogen or ferrous alloys to obtain cleaner metals. In general, the addition of a small amount of lanthanum to steel, improves its malleability, resistance to the impact and ductility. The addition of 0,2 to 5% of lanthanum to molybdenum decreases the hardness of this metal and its sensitivity to temperature variations.