Higher-Strength Steel Weldments for Submarine Hulls

摘要

Progress is report on the development of an HY-130/150 weldment and in a study of the feasibility of developing an HY-180/210 weldment. The accomplishments to date in the HY-130/150 program indicate that a 5Ni-Cr-Mo-V steel has been developed that meets essentially all the requirements for an HY-140 steel. When the 5Ni-Cr-Mo-V steel was joined with a 140 ksi yield-strength 2Mn-2Ni MIG filler metal, the resulting weldments exhibited good performance in explosion tests. These tests also showed that when the yield strength of the weld metal matched or overmatched that of the base metal, the deformation characteristics of the weldments were satisfactory, whereas those of an undermatching weld metal were unsatisfactory. Results of the HY-180/210 program indicate that the development of a 180 ksi minimum-yield-strength weldment having a Charpy V-notch energy absorption of about 50 ft-lb is feasible.