METAL-BASED JET CHARGE LINING MATERIAL Russian patent published in 2013 - IPC F42B1/32 

FIELD: weapons and ammunition.

SUBSTANCE: jet charge lining is made of iron-based material and contains a limit mass fraction of admixture elements and alloying elements, %, not more than: carbon - 0.005, manganese - 0.005, silicon - 0.02, sulfur - 0.003, phosphorus - 0.003, chrome - 0.01, nickel - 0.025, copper - 0.01, aluminium - 0.5, oxygen 0.003, nitrogen - 0.005. The lining may have axisymmetric shape or is made in the form of a cone, or a truncated cone, or a part of hemisphere, or an inner jet-forming layer of 2-layer liners. It may be with an isotropic structure or with a structure formed mainly with identical crystallographic direction of crystals with columnar structure arranged along the normal line to the generatrix of the jet lining surface.

EFFECT: improved armour piercing of a charge.