A color picture tube shadow mask material excellent in tensile strength and high-temperature creep strength, a shadow mask and a picture tube incorporating the mask, wherein the shadow mask material uses a low-carbon alloy steel plate containing 0.05 to 2.5 wt.% of Cu and 0.001 to 0.4 wt.% of P, or 0.05 to 2.5 wt.% of Cu, 0.001 to 0.4 wt.% of P and 0.01 to 1.75 wt.% of Ni.
