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Magnetoresistive contribution to the residual resistivity of polycrystalline pure irons, having the electrical resistivity ratios RRR=ρ(295^°K)/ρ0(4.2^°K) from 35 to 400, has been measured at 4.2°K in longitudinal magnetic fields up to 5.5 KOe. Analysis of the relation between the resistivities of ρ(B=0, 4.2°K) extrapolated to B=0 and ρ0(H=0, 4.2°K) at H=0 indicates that the electrical resistivity measured at H=0 contains magnetoresistive contribution of the order of 38%–84% for RRR=35–400 and depends upon the concentration of impurities. The magnitude of the maximum magnetoresistivity ρmag(4.2^°K)=|ρ0-ρimp(B=0,4.2^°K)| was approximately found to have a value of 0.02µΩ cm for iron at 4.2°K.

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