RHA ( English rolled homogeneous armor , German 'rolled homogeneous armor') describes a theoretically assumed armor made of steel .
The thickness of RHA armor has established itself as a comparative value for the penetration resistance of military vehicle armor or the penetration power of projectiles and other anti-tank weapons.
The original RHA steel was used in the armored vehicles of the Second World War, which were constructed from cast steel and rolled steel. After the Second World War, advances in metallurgy led to more powerful steel alloys , later also light metal armor, ceramics and composite armor made from combinations of several materials. The RHA values given for this are only a reference value for the dielectric strength, while the actual thickness is usually much smaller.
- Armor Technology (accessed January 7, 2016)