Material for shadow mask, method for production thereof,...

Details Material for shadow mask, method for production thereof,... Material for shadow mask, method for production thereof,...

2006-04-11

2006-04-11

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S407000

Reexamination Certificate

active

07026751

ABSTRACT:
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 O to 30° C., the coiling temperature is 650 to 700° 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.

REFERENCES:
patent: 55-138027 (1980-10-01), None
patent: 11-323500 (1999-11-01), None
NKK Corp, “Steel Sheet for TV Mask Frame” Abstract of JP11-323500 A (Nov. 26, 1999).
Nippon Kokan KK (JP) Nippon Mining Co Ltd. (JP), “Manufacture of Cold-Rolled Steel Sheet for Shadow Mask” Abstract of JP55-138027 A (Oct. 28, 1980).

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