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Talk about the aircraft carrier steel
- Apr 16, 2018 -

To build a large aircraft carrier needs a wide range of steel varieties, general Steel Division hull plate, armor plate and structural plate 3 categories. The underwater part of the hull plate is aimed at preventing the torpedo from bombarding the submarine missile, the use of steel thickness up to 150~203mm, also made of double-layer or 3-storey hull, when the outer plate is damaged, the inner hull function is still, do not sink dead and no combat effectiveness; The deck is used for bullet-proof and core parts, such as the command station is the headquarters of the whole ship, With deck protection, is also the most thick part of the aircraft carrier board, the thickness of the armor plate up to 330mm, performance similar to the tank plate; the structural plate is mainly used for the runway, the compartment and the hull structure, the general plane runway plate thickness is 40~50mm, the roughness is high, otherwise it will affect the quality of aircraft take-off and landing, and the larger the plate, the better, as far as possible to reduce the weld, weld a lot of damage to the aircraft tires. 

HSLA-80 Steel is a new high strength and high toughness structural steel developed by the United States in the the 1980s. The section has partially or wholly replaced HY-80 steel for the construction of large surface warships, such as destroyers, cruisers and aircraft carriers, of which the "Nimitz" class of nuclear-powered aircraft carriers Use this steel to perform ml-s-24645a standards. HSLA-100 Steel is the United States for the new aircraft carrier Shell and advanced attack-type nuclear submarine (non-pressure shell) and the development of steel, its performance has reached the level of HY-100 steel, plate thickness up to 100mm,1990 the United States has developed its military norms ml-s-24645a, The welding material is the same as that of HY-100 steel. The first orders for HSLA-100 Steel were for the nuclear-powered aircraft carrier "Stennis" (CVN-74). The yield strength of HSLA-115 steel is about MPA, which is higher than HSLA-100 steel (yielding strength is about 690 MPa). The United States Navy used the latter as the future aircraft carrier CVN-78 flight deck steel, for weight loss and reduction of center of gravity developed HSLA-115 steel. The United States Navy, from February 28, 2007 to February 22, 2010, carried out a study on the project "Evaluation and implementation phase II of High-performance HSLA-115 steel". By the new heat treatment, the yield strength of the high-strength Low-alloy steel HSLA-100 is increased to 115ksi (794MPa) (code-named HSLA-115) to reduce the thickness of the steel plate, so that the hull weight can be reduced under the condition of satisfying the performance requirement; the steel plate for the evaluation of mass production has been carried out, Determine HSLA-115 performance indicators and construction process manufacturability, optimize welding and shipyard operation process plan, and Supplier qualification certification.