81:'s post-World War I "Wotan weich" armor, STS could be used as structural steel, whereas traditional armor plate was entirely deadweight. STS was expensive, but the United States could afford to use it, lavishly, and did so on virtually every class of warship constructed from 1930 through the World War II era, in thicknesses ranging from bulkheads to splinter protection to armored decks to lower armor belts.
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steel developed around 1910. 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
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After World War II, the Bureau of Ships conducted a research program for developing a high strength steel for ship and submarine construction. During testing, a variant of STS with modifications in carbon and nickel content and the addition of
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over the prior nickel steel armor, though vanadium was no longer used after 1914. This alloy-steel became known as "Special
Treatment Steel (STS)"; it became the U.S. Navy Bureau of Construction and Repair (later
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that was less than 4 in (102 mm) thick; homogeneous armor for gun mounts and conning towers, where the thicknesses were considerably greater, used
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Heller, S. R.; Fioriti, IVO; Vasta, John (1965). "An
Evaluation of Hy-80 Steel. As a Structural Material for Submarines. Part Ii".
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Class "B" armor which had similar protective properties as STS. Somewhat more ductile than the average for any similar armor, even
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248:"Okun Resource - Table of Metallurgical Properties of Naval Armor and Construction Materials - NavWeaps"
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342:. National Research Council (U.S.). Committee on Accelerated Utilization of New Materials. pp.77-78.
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Unlike some similar steels, such as Krupp Ww, STS did not use molybdenum.
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Gene Slover's US Navy Pages - Naval
Ordnance and Gunnery
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105:. Low-carbon STS became the forerunner of
340:Accelerating Utilization of New Materials
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199:110–125 ksi (760–860 MPa)
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220:Percent reduction in area
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97:and the aircraft carrier
27:US warship armor material
204:Yield/Ultimate strength
315:Naval Engineers Journal
31:Special treatment steel
18:Special Treatment Steel
300:"Armor-Chapter-Xii-C"
57:STS is a homogeneous
39:protective deck plate
267:"Armour chapter XII"
212:Percent elongation
127:Alloying elements
75:Bureau of Ordnance
246:DiGiulian, Tony.
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195:ultimate strength
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157:1.75–2.00%
147:3.00–3.50%
353:Categories
286:References
257:2018-01-20
137:0.35–0.4%
113:Metallurgy
95:(AGSS-569)
87:molybdenum
59:Krupp-type
184:(520-590
101:Forrestal
276:28 March
233:200-240
193:Tensile
174:Tensile
153:Chromium
93:Albacore
240:Sources
103:(CV-59)
53:History
180:75-85
143:Nickel
133:Carbon
207:0.68
107:HY-80
79:Krupp
278:2015
99:USS
91:USS
323:doi
223:68
215:25
186:MPa
182:ksi
35:STS
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