The Specification for D steel are:
UTS: 84,000-88,000 psi
YTS: 46,000 psi
Ductility: 17% Elongation in 8-inches.
DW (D weldable used after 1942) had the carbon reduced from 0.26%-0.30% (by weight) to 0.23%
UTS: 70,000 - 80,000 psi
YTS: 44,000 psi
Ductility: 17% elongation in 8-inches.
Also can't help but wonder at the way German ships seemed to handle multiple torpedo strikes..... I do not know the composition of the their steel
The German construction steel was Stahl-52
1942 tests (examining and addressing some weld failures) revealed these mechanical characteristics:
UTS: 53.3 kg/mm2
YTS: 37 kg/mm2
Ductility: 32% elongation, 61% reduction of area.
Welds using E52K low hydrogen electrode was
UTS: 52.7 kg/mm2
YTS: 45.7 kg/mm2
Ductility: Elongation 27.5%
German torpedo bulkheads were constructed from Ww homogenous armour, a treated chrom/moly steel. Ww was weldable but welding directly to armoured bulkheads was banned until Aug 1939. Therefore, the Scharnhorst and Bismarck classes ..ect.. had their armoured bulkheads riveted. The Ww from Tirpitz tested for this composition: