Staballoy is the name of two different classes of metal alloys, one class typically used for munitions and a different class developed for drilling rods.
In a military context, Staballoys are metal alloys of a high proportion of depleted uranium with other metals, usually titanium or molybdenum, designed for use in kinetic energy penetrator armor-piercing munitions. One formulation has a composition of 99.25% of depleted uranium and 0.75% of titanium. Other variants can have 3.5% of titanium. They are about twice as dense as lead.
An alternative to staballoys in kinetic penetrator munition is tungsten, but it is more expensive, more difficult to machine and is not pyrophoric, so the munition lacks the incendiary effect enhancing its impact. An emerging alternative alloy of depleted uranium is Stakalloy.
Staballoy is also a name for a class of commercially used stainless steels used for drilling rods for drilling rigs. An example is the Staballoy AG17. It is a different material from military staballoy. It contains 20.00% manganese, 17.00% chromium, 0.30% silicon, 0.03% carbon, 0.50% nitrogen, and 0.05% molybdenum, alloyed with iron. It is nonmagnetic. [1]