Specimens for tensile tests were machined from
the steel plates. Cylindrical specimens of dimensions
shown in Fig. 2 standardized by EN ISO 6892-1:2009
standard [7] were used for testing. Hardness was
measured using Vickers pyramid according to EN ISO
6507-4:2005 standard [8] and load of 98.1 N in three
different locations from the upper side of the plate
where later the armour piercing has been done. Three
hardness measurements were taken at each location.