What lighter high-strength steel could do for warships

What ships could Britain produce with steel offering the same qualities at half the weight?

It could build super-sized destroyers or retain existing dimensions and gain much stronger structures.

The proposed material retains the desired steel qualities at half the weight. Larger destroyers are one suggested use. Another is to retain familiar hull dimensions and plating thickness while gaining greater structural strength. The design choice is whether to use the improvement for size or structural margin.