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Permit class USS Plunger on the building ways at Mare Island. HY-80 is a high-tensile, high yield strength, low alloy steel.It was developed for use in naval applications, specifically the development of pressure hulls for the US nuclear submarine program and is still currently used in many naval applications.
Low-carbon STS was used in the experimental submarine USS Albacore and the aircraft carrier USS Forrestal. Low-carbon STS became the forerunner of HY-80, which eventually became the standard steel for submarine construction during the Cold War. [2] [3]
The hull of the Albacore utilized HY-80 high-strength steel [3] with a yield strength of 80,000 psi (550 MPa), although this was not initially used to increase the diving depth relative to other US submarines. HY-80 remained the standard submarine steel through the Los Angeles class. [15] Other components were made from high-tensile steel (HTS ...
The first submarine commissioned in the class was the ill-fated Thresher, and so the class was known by her name. When Thresher was lost on 10 April 1963, the class took the name of the second ship in the class, Permit. Thresher had numerous advanced design features and embodied the future of US Navy submarine design, and her loss was a serious ...
The pressure hulls of both ships were partially manufactured using stronger HY-100, [citation needed] instead of the HY-80 steel used in the manufacturing of all other Los Angeles class submarines. This was done to test construction methods using this steel, which would later be employed in the assembly of the new Seawolf-class submarines.
To accommodate the larger piping and thicker hull, other systems had to be lightened. (Reference the GAO and RAND reports.) The pressure hull construction was HY-80 alloy steel (same as larger nuclear powered submarines) and the batteries were contained in separate titanium alloy pressure enclosures (14 total) which hung beneath the hull.
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HY-80 remained the standard submarine steel through the Los Angeles class. [5] Control room of Skipjack class; the bow is at the top. Another Barbel-like innovation was the combination of the conning tower, control room, and attack center in one space. This was continued in all subsequent US nuclear submarines.