MATERIAL FOR SHADOW MASK, METHOD FOR PRODUCTION THEREOF, SHADOW MASK COMPRISING THE MATERIAL AND PICTURE TUBE USING THE SHADOW MASK

摘要

A material for a shadow mask, characterized in that it has a chemical composition: C = 0.0030 wt %, Si = 0.03 wt %, Mn: 0.1 to 0.5 wt %, P = 0.02 wt %, S = 0.02 wt %, Al: 0.01 to 0.07 wt %, N = 0.0030 wt %, B: an amount satisfying 0.5 = B/N = 2, and balance: Fe and inevitable impurities, and can form a shadow mask having a coercive force Hc of 90 A/m or less; and a method for producing the material, characterized in that use is made of a raw material having the above chemical composition, the finishing temperature in hot rolling is lower than Ar3 point by 0 to 30 DEG C, the take-up temperature is 650 to 700 DEG C, and the rolling reduction percentage in the final rolling (secondary cold rolling) is 30 to 45 %. The material produced by the method exhibits magnetic characteristics being uniform in a coil and excellent as described above.