Fe-Ni alloy with excellent magnetic properties for semi-tension mask, semi-tension mask of the alloy, and color picture tube using the mask

摘要

This invention provides, as a means of securing magnetic shield properties for a semi-tension mask and precluding color irregularity or mislanding on the phosphor due to beam drift, a Fe—Ni alloy for semi-tension mask comprising, in mass percentage (%), from 34 to 45% Ni, from 0.01 to 0.5% Mn, and the balance Fe and unavoidable impurities, said alloy being such that a sheet obtained after final cold rolling has an &agr;_{(111)+(220)}, said sum of the X-ray intensity ratio of (111) plane and (220) plane in the rolled surface represented by Formula 1 $\mathop{\mathrm{image}}$ {\mathrm{\α}}_{\left(111\right)+\left(220\right)}=\frac{I_{\left(111\right)}+I_{\left(220\right)}}{I_{\left(111\right)}+I_{\left(200\right)}+I_{\left(220\right)}+I_{\left(311\right)}}\×100\⁢\text{\ }\⁢\left(\%\right)$$;of no less than 15%. The invention also provides a semi-tension mask of the alloy, and a color picture tube using the semi-tension mask.