Abstract
This paper presents a newly-developed TMCP steel plate which enables the reliable construction of LPG carriers with highly efficient automatic welding and shop working. In order to develop the new steel plate, the recent refined microalloying technology with trace elements of Ti, Nb and B, as well as the advanced Thermo-Mechanical Control Process, was fully utilized. The application of the new steel plate to LPG carriers was confirmed to bring about the noticeable improvement in propagating crack arrest capability, fracture toughness reliability even at high heat-input welding, and shop workability.
