Welding and Fabrication of New High Tensile Steels for Submarine in Japan

概要

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The first Japanese Tear Drop type submarine, adopting the super-high strength steel NS63 for her pressure hull envelope, built on the No. 1 berth in Kobe shipyard of KHI, was delivered to the Defence Agency on January 21st, 1971. The steel, NS63, used for this submarine is a very high grade steel, especially in regard to strength and toughness. Its yield strength is 10, 000 lbs/in^2 higher than that of HY80, used for the Nuclear Powered Submarines of the U.S. Navy. Before constructing the submarine the authors performed the various kinds of weldability and fabrication tests of laboratory scale on the NS63 steel, and they also carried out a model fabrication test. The model has the same structure as the assembly unit of the actual submarine to be built. On the basis of the results of these tests the welding and fabrication procedure for the NS63 steel was determined. This article describes the outline of welding and fabrication procedure for NS63 steel as well as the results of the tests of laboratory scale and of the model fabrication test.
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