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New Naval Armor/ Structural Steel

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  • New Naval Armor/ Structural Steel

    Starting in the mid-1990s, the Navy focused on the development of high-strength low-alloy steel (HSLA-65, -80, and -100) for ship construction in the thickness range of 5/16-inch. to 1-5/8 inch. HSLA-65 and HSLA-100 steels are being considered for immediate application as the primary structure in the DD (X), CVN 77, and CVNX 1 for weight reduction and fabrication cost savings. More recently, Division metallurgists have collaborated with researchers from Japan in a cooperative program to develop structurally acceptable methods to use “under-matched” strength weldments for use with high-strength steel alloys (yield strength greater than 150 ksi). This technology has the potential to significantly reduce the costs of high-strength steel in ship construction.

    The Navy believe that the new carriers can shed a few pounds if this steel is used in the carrier hulls. Preliminary calculations indicated that if it was used in hull plate, it could provide equal or greater service life than the traditional high-strength steel, but be thinner, and therefore weigh less. The same would be true for the hull's interior supporting structures.

    HSLA-65 is stronger and tougher than conventional steel, and has proven itself in commercial bridges, pipelines and other ship above-deck structures. Rigorous certification testing of this new steel is underway

    http://www.globalsecurity.org/milita...cvx-design.htm

    This new steel is nearly as strong as Titanium endurance wise.
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