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Naval armor refers to the various protections schemes employed by warships. The first ironclad warship was created in 1859, and the pace of armour advancement accelerated quickly thereafter. The emergence of battleships around the turn of the 20th century saw ships become increasingly large and well armoured.
Traditionally, a warship's armor system was designed both separately from, and after, the design layout. The design and location of various component subsystems (propulsion, steering, fuel storage and management, communications, range-finding, etc.) were laid out and designed in a manner that presented the most efficient and economical utilization of the hull's displacement.
The development of such homogeneous steel resulted from testing which showed that face-hardened armor was less effective against high-obliquity glancing impacts. Around 1910, Carnegie Steel developed a new nickel-chrome-vanadium alloy-steel that offers improved protection over the prior nickel steel armor, though vanadium was no longer used ...
The belt armor (A) is on the exterior, at the waterline. Also indicated is the main deck (B), the sloping deck armor (C), and the torpedo bulkhead (D). A torpedo bulkhead is a type of naval armor common on the more heavily armored warships , especially battleships and battlecruisers of the early 20th century.
Homogeneous armour was typically used for deck armour, which is subject to more high-obliquity impacts and, on some warships such as Yamato class and Iowa class battleships, for lower belt armour below the waterline to protect against shells that land short and dive underwater.
There was a choice between open or closed hangar and the position of the armour. The placing of the strongest deck affected the strength of the hull. The further apart the deck and the keel, the stronger the design. If the flight deck was placed above the main deck then it had to be built to allow for movement with expansion sections. [1]
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As in the designs of all early dreadnoughts, the deck armor was very thin at 1.5 in (38 mm) in most areas and 2 in (51 mm) over machinery and magazine spaces. These ships were expected to do most of their firing at ranges less than 10,000 yd (9,144 m). At such distances, deck strikes would be a rare event. [23]