However, the use of homogeneous armour at such thickness does not equate to the same protective properties as the same thickness of high quality homogeneous plates either. The quality of American Class A plates (face hardened) were found to be so poor that Class B plates were substituted for the turret face plates on all the new construction battleships. It also has the correct concentration molybdenum, and in tests Mo significantly improved resistance to penetration by capped shell. It was found that if the tensile strength exceeded 80kg/mm2 then it was significantly more resistant to penetration at oblique striking angles, particularly against de-capped shells. When using the same measurement methods, the German chrom/moly Wh armour is tougher and more ductile than STS/Class B per tensile strength. The German face hardened armour was virtually as good as the best British.Īdditionally, I am thoroughly convinced that the German homogeneous armour was also superior to American homogeneous armour. It is well documented about the poor quality of US face hardened armour during that period. However, the quality of the German armour materials are superior.

Tirpitz's calculates to at least 150mm effective thckness over the magazines and 130mm over the machinery.

Iowa's deck protection calculates to 140mm effective thickness.

World of warships iowa gun penetration