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KCA retained the hardened face of Krupp armour via the application of carbonized gases but also retained a much greater fibrous elasticity on the rear of the plate. This increased elasticity greatly reduced the incidence of spalling and cracking under incoming fire, a valuable quality during long engagements.
Case-hardened Harvey armor was the first major development, followed by chromium alloyed and specially hardened Krupp armour. Ducol steel came into use in the 1920s, and was widely used on World War II era ships. Futuristic armor designs include electric armour, which would use electric shielding to stop projectiles.
Case-hardening or carburization is the process of introducing carbon to the surface of a low-carbon iron, or more commonly a low-carbon steel object, in order to harden the surface. Iron which has a carbon content greater than ~0.02% is known as steel .
Harvey armor was a type of steel naval armor developed in the early 1890s in which the front surfaces of the plates were case hardened. The method for doing this was known as the Harvey process , and was invented by the American engineer Hayward Augustus Harvey .
Kalashnikov rifles (Russian: Автоматы Калашникова), also known as the AK platform, AK rifles or simply the AK, are a family of assault rifles based on Mikhail Kalashnikov's original design.
RHA is homogeneous because its structure and composition are uniform throughout its thickness. The opposite of homogeneous steel plate is cemented or face-hardened steel plate, where the face of the steel is composed differently from the substrate. The face of the steel, which starts as an RHA plate, is hardened by a heat-treatment process.
Henry Repeating Arms manufactures rifles, shotguns, and revolvers. The company produces a broad range of lever-action rifles in both rimfire and centerfire calibers, in a variety of finishes, including alloy, steel, hardened brass, hardened silver, color case hardened, and All-Weather.
He is best known for inventing the Harvey process for case hardening the front surface of steel armor plate. The resulting Harvey armor was widely used on armoured ships in the 1890s. He invented the process while living in Orange, New Jersey , and died there on August 28, 1893.