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152 mm Smoke D-540
Регіон
China
Категорія
Ammunition, Missiles and precision weapons
The 152 mm Smoke D-540 is a separate loading ammunition, consisting of the projectile and a variable charge system contained in a brass or lacquered steel cartridge case. The projectile is forged steel with a long streamlined ogive, a boat tail and a shallow bourrelet. A single copper drive band is just over 24 mm wide. The contents are a nominal 6.626 kg of White Phosphorus (WP), this is released when the projectile body is burst open by an internal burster charge following detonation, via an unspecified model of
point detonating fuze. When the WP contents contact the atmosphere they start to create clouds of grey/white screening smoke. The 152 mm ammunition uses a two-part variable charge system contained in brass or lacquered steel cartridge cases 547.5 mm long. The two parts are the Reduced Charge and the Full Charge, each in its own cartridge case. The Reduced Charge uses nitrocellulose powder in a series of 12 bags. Charge 6, the lowest comprises the base bag charge only, to which a series of equal size bags are added to create higher charges. One charge bag is added to the base charge bag to comprise Charge 5, two are added for Charge 4, three for Charge 3 and five for Charge 2. These are all held in place by a fibre cup. The total weight of the Reduced Charge propellant is 4.2 kg. The Full Charge uses NGH or NDT-3 powder in bags. Charge 1 has two base bag charges, one located above the other. To create the Full Charge two further equal size bag charges are added. A fibre cup holds the charge bags in place. The total weight of the Full Charge propellant is 8.8 kg. Both charges are initiated by a KV-4 percussion primer in the base of the cartridge case. With a 152 mm gun-howitzer such as the D-20 the Reduced Charge muzzle velocities vary from 282 to 511 m/s. This produces ranges from 6,710 to 13,400 m. The Full Charge produces a muzzle velocity of 655 m/s and a maximum range of 17,400 m. The 152 mm Smoke D-540 (actual calibre 152.4 mm) is the successor to the earlier D-530 developed originally for use with the 152 mm Howitzer M1943 ( D-30 ) - the two projectiles are compatible. The Smoke D-540 does not appear to remain in production in Russia.