Abstract: Armour-plate comprising a two layer bonded subsequently heat-treated clad steel comprising an upper layer and a base layer wherein:(a) the upper layer contains (in percent by weight)______________________________________ 0.30 to 0.80% carbon 0.10 to 0.80% silicon 0.40 to 1.20% manganese up to 0.015% phosphorus up to 0.015% sulfur 0.20 to 2.80% chromium 0.05 to 1.00% molybdenum 0.01 to 0.05% aluminum up to 0.40% nickel ______________________________________remainder iron including unavoidable impurities;(b) said base layer contains (in percent by weight) ______________________________________ 0.17 to 0.40% carbon 0.10 to 0.80% silicon 0.40 to 2.00% manganese up to 0.025% phosphorus up to 0.025% sulfur 0.10 to 1.50% chromium 0.05 to 1.50% molybdenum 0.01 to 0.05% aluminum ______________________________________remainder iron including unavoidable impurities the carbon content of said upper layer being substantially higher than the carbon content of said base material.