The effect of single addition (C, B<0.041%, others<2.0%) of various minor alloying elements such as C, Si, Mn, Ni, Cr, Co, Nb, Ti, V, Zr, and B in the Fe-36%Ni alloy on the mechanical properties, especially 0.2%proof stress and Young's modulus, was investigated. The results obtained are as follows:
(1) Cr is the only element which decreases the 0.2% proof stress in the Fe-36%Ni alloys.
(2) There is a good relation between the magnitude of the effects of alloying elements on the proof stress and the radius of atoms of alloying elements.
(3) The addition of C, Si, Ni, Co decreases the Young's modulus, while the addition Mn, Cr, Nb, Ti, Zr, B increases it. The effect of such alloying elements except B on the Young's modulus can be classified by the period and group in the periodic table.
(4) From the view of the number of valence electrons and the texture, the origin of the effect of alloying elements on the Young's modulus has been discussed.