Method of making material for shadow masks

Details Method of making material for shadow masks Method of making material for shadow masks

1981-01-27

1984-01-24

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 121, C21D 804

Patent

active

044274602

ABSTRACT:
The present invention is concerned with a method of making material for shadow masks to be incorporated in cathode ray tubes for colour TV sets.
A coil of cold rolled low carbon Al-killed steel is forcibly decarburized through an open coil annealing until a quench aging index QAI becomes 3.0Kg/mm.sup.2. This QAI is specified as follows: ##EQU1## wherein, W1: load (Kg) giving 10% tensile strain to the said decarburized material having been soaked at temperature of 500.degree. C. for 10 minutes and subjected to a water cooling

REFERENCES:
patent: 3510366 (1970-05-01), Mears
patent: 3909311 (1975-09-01), Yamada et al.
patent: 3959029 (1976-05-01), Matsudo et al.
patent: 4325752 (1982-04-01), Suda et al.

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