Method for manufacturing an aperture grill material for color picture tube

A method for manufacturing an aperture grill material for use in a color picture tube comprising:

• cold rolling a low carbon alloy hot rolled steel strip containing 0.05 to 2.5% by weight of Cu and 0.001 to 0.4% by weight of P, and further containing at least one of Cr and Mo in a total amount of 0.01 to 0.5% by weight;
• applying an intermediate annealing step at a temperature range from 500 to 900° C.;
• cold rolling a second time;
• and
• applying a precipitation treatment to the strip within a temperature range from 300 to 750° C.

A method of manufacturing an aperture grill material for use in a color picture tube comprising:

• cold rolling a low carbon alloy hot rolled a strip containing 0.05 to 2.5% by weight of Cu, 0.001 to 0.4% by weight of P and 0.01 to 1.75% by weight of Ni, and further containing at least one of Cr and Mo in a total amount of 0.01 to 0.5% by weight;
• applying an intermediate annealing at a temperature range from 500 to 900° C.;
• cold rolling a second time, and
• applying a precipitation treatment within a temperature range from 300 to 750° C.