Television picture tube inner shielding material having a blacke

Details Television picture tube inner shielding material having a blacke Television picture tube inner shielding material having a blacke

1990-02-27

1992-03-10

Woo, Jay H.

Stock material or miscellaneous articles

Composite

Of metal

148287, C21D 812, C23C 810

Patent

active

050949209

ABSTRACT:
An inner shielding material and a method of manufacturing the same, wherein the material comprises a steel sheet 0.10 to 0.25 mm thick of a composition of .ltoreq.0.005% C, .ltoreq.2.0% Si, .ltoreq.0.4% P, 0.1 to 1.0% Mn, 0.01% S, .ltoreq.0.01% sol.Al, .ltoreq.0.01% N and the balance Fe and residual impurities, having a hardness H.sub.v (500 g) of 90 or greater and a grain size of 7 or less when measured by ferrite grain size; and a blackened layer on the surface of the steel sheet comprising primarily FeO formed by transformation of Fe.sub.3 O.sub.4 and having superior adhesion.

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