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Recent iron and steel alloys are very complicated. It is necessary to research the fundamental properties of iron for the development of these alloys. For this purpose the properties of various kinds of commercial and trial-manufactured pure irons were investigated at first. Pure iron contains generally C, Si, Mn, P, S, Ni, Mo, V, Ag and Sn as impurities. Mechanical properties of full annealed pure iron are approximately as follows. Hardness : H_RB 30, tensile strength : 30kg/mm^2, elongation : 50%, reduction of area : 70%. Ultrahigh purity iron (Fe>99.99%) is high in work hardening rate and has good corrosion resistance.