The modern "High Tensile Steel" listed in the link is not the same material as "HTS" of the Hood's era. Indeed 40xx series steels are a Cr/mo alloy and are a modern derivative Krupp Wotan steel. At the time of the Hood's construction 4030 series Cr/mo alloys hadn't been invented yet. The HTS of the interwar era is just a plain carbon steel with greater carbon content than mild steel.
The mechanical properties of steel alloys are set by the heat treatments they receive, and also by the cooling rates once heated. Heat treatments can be used to make steel harder and that also increases the utlimate tensile strength, but at the cost of reduced ductility. For example, Wh treated to a hardness of 225 brinell has a UTS of ~120,000 psi and an elongation of ~26%. Treated to a hardness of 255 brinell the UTS is increased to ~133,000 psi and the elongation is reduced to ~20%.
A good measure of toughness, or the ability to absorb kenetic energy before failure, is the ratio of ultimate tensile strength to yield strength. The YTS is the point were the material starts to deform, and the UTS is the point were it finally ruptures. The wider this ratio, then the greater the deformation capacity and toughness of the material under impact. In this metric Wh is about the best there is even by todays standards.
A regular HT carbon steel could be treated to to have similar tensile strength as a armour grade alloy, but the ductility ,toughness, and impact resistance, would compare very poorly. At a comparable ductility, a high tensile carbon steel would have a UTS of around 75,000 psi.
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