最近の船体用高張力鋼溶接継手部の強度特性について

概要

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The authors have investigated the fracture toughness of the 50kgf/mm^2-class new high-tensile steel plates, which is newly developed and named thermo-mechanical controlled rolling process steel (or TM-steel). The object is not only the base metal but also the welded joint, which is subjected to the high heat-input by the welding in shipbuilding stages. The general properties of TM-steel are first surveyed, and next the fracture toughness or the crack initiating resistance are examined. In addition to the material examinations, a method is proposed to estimate the fracture toughness, especially the brittle fracture initiation temperature at the prescribed stress level and crack length, using the V-notch Charpy transition temperature. And consequently, the 50kgf/mm^2-class new high-tensile TM-steel is shown to be adequate for being adapted as ship hull plates and subjected to the highest class heat-input by the yard stage welding. Also the TM-steel's crack arresting characteristics are checked and guaranteed as "crack arrester", by supposing that the necessary arresting toughness K_<ca> should be more than 600kgf√<mm>/mm^2 at the minimum service temperature 0℃.
1983-08-24