STEEL GRAIN-ORIENTED ARMOUR Russian patent published in 2011 - IPC F41H1/02 F41H5/04 

FIELD: weapons and ammunition.

SUBSTANCE: steel armour is proposed. Armour consists of combined armoured plate made in the form of monoblock, containing front layer, intermediate layer and rear layer. Front layer is made from high-strength steel with hardness of 58…64 HRC; intermediate layer is made from grain-oriented steel with grain orientation {111} in the sheet plane, and rear layer is made from armoured steel with hardness of 52…56 HRC and thickness of 0.5…1.5 of thickness of front layer.

EFFECT: increasing armour stability level.