Aperture grill material for color picture tube, production method thereof, aperture grill and picture tube

A method for producing an aperture grill for a color picture tube, comprising:

• providing a low carbon alloy hot rolled steel consisting essentially of no more than 0.01 wt % carbon, 0.001-0.4 wt % phosphorus, 0.05-2.5 wt % copper, 0.01-1.75 wt % nickel, no more than 0.5 wt % manganese, no more than 0.3 wt % silicon, no more than 0.05 wt % sulfur, no more than 0.05 wt % nitrogen, with the remainder being substantially entirely Fe;
• cold-rolling said low carbon alloy hot-rolled steel to provide a cold-rolled low carbon alloy steel;
• and
• subjecting said low carbon alloy cold-rolled steel to a precipitation treatment at a temperature of 300-700° C.

A method for producing an aperture grill for a color picture tube, comprising:

• providing a low carbon alloy hot rolled steel consisting essentially of no more than 0.01 wt % carbon, 0.001-0.4 wt % phosphorus, 0.05-2.5 wt % copper, 0.01-1.75 wt % nickel, no more than 0.5 wt % manganese, no more than 0.3 wt % silicon, no more than 0.05 wt % sulfur, no more than 0.05 wt % nitrogen, with the remainder being substantially entirely Fe;
• cold-rolling said low carbon alloy hot-rolled steel to provide a cold-rolled low carbon alloy steel;
• subjecting said cold-rolled low carbon alloy to annealing at a temperature of 500-800° C., followed by secondary cold-rolling;
• and
• subjecting said low carbon alloy cold-rolled steel to a precipitation treatment at a temperature of 300-700° C.