The paper reviews the results of a series of tests the authors performed on base metal and high-heat-input welded joints of TMCP-manufactured low-temperature high-tensile steels 36 and 42(43)kgf/mm^2 classes in yield point to evaluate their strength characteristics for application to ocean structures to be used in frigid sea areas. The evaluation concerned in particular the following. (1) Toughness required for use as ocean structural steels. (2) Applicability of the TMCP steels to ocean structures used in frigid sea as viewed from (1) above. (3) Advantages of the TMCP steels as ocean structural material from view points of weldability and workability.
