Historical metallurgy is one of the most interesting fields of archaeometry. Armours also were usually crafted using high quality materials, and this seems is evident in those armours originating from Western Europe. But, research activity into this class of material, originating from Far Eastern countries, is far less extensive. The few analyses, carried out on Japanese armours through metallography, reveal that most items of armour were composed of pure ferrite, while only a small number appeared to have been made of low-carbon steel and none of them were hardened. We propose to measure several different armour components: 3 haidate (leg protection), 4 kote (hand protection) and 8 kabuto (helmets) pertaining to armour of different time (from early 17th century until 19th century) and quality (from ashigaru armours for the infantry, to armours for mounted samurai).