ARMOUR-PIERCING BULLET SLUG Russian patent published in 2013 - IPC F42B12/00 F42B12/02 F42B12/06 F42B30/00 F42B30/02 

FIELD: weapons and ammunition.

SUBSTANCE: armour-piercing bullet slug is made from hard alloy with ultimate compressive strength of more than 4000 MPa, hardness HRA of not lower than 88.5 units, stress intensity factor K_1c of not lower than 8 MPa*m^1/2. Slug has the shape of rotation body in the form of a cone-shaped head portion and cylinder-shaped shank portion, which are connected to each other. Head portion is pointed; length of head portion is (0.7-2.1)d; slug length is (1.95-5.55)d; shank portion has a chamfer or rounding radius of up to 0.15d, where d - diameter of bullet slug, which is equal to (0.6-0.95)D, where D - bullet gauge. Slug surface, either fully or partially, has roughness of not worse than Ra 1.6. Slug material contains 6 to 9 wt % of cobalt and/or nickel, and tungsten carbide is the rest. Quantity of grains of the main fraction of tungsten carbide with size of 1-2 mcm is at least 60%. Size of individual large grains of tungsten carbide with grain size that exceeds the average grain size by 4 times is not allowed. Pointed part of the cone has a contact platform, the diameter of which is equal to (0.018-0.25)d, where d - bullet gauge.

EFFECT: improving bullet destructive ability.

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