Toyo Kohan Co., Ltd.

Toyo Kohan., Ltd.

Yasuo Tahara

Tsuneyuki Ide

Hironao Okayama

Akira Ikeda

Susumu Sigemasa

Susumu Shigemasa

Takahiko Miyazaki

Taizo Sato

Setsuo Takaki

Hiroshi Fujishige

Hiroaki Ikenaga

A material is provided for marking aperture grilles for use in a color picture tube which has excellent yield strength, high temperature creep strength, and superior magnetic characteristics as compared to conventional materials. The material is made by cold-rolling a low carbon sheet containing 9 to 30 weight % of Ni or 9 to 30 weight % of Ni and 0.1 to 5 weight % of Co, and annealing the cold-rolled steel sheet at a temperature of 400-500&deg; C.

Material for aperture grill for color picture tube, process for making the same, aperture grill, and picture tube

An aperture grill material for a color picture tube having excellent tensile strength and high-temperature creep characteristics and magnetic characteristics superior to existing materials, a production method therefor, an aperture grill and a color picture tube. The aperture grill material for a color picture tube is characterized by being consisting of a low-carbon alloy steel sheet containing 0.05 to 2.5% by weight of Cu and 0.001 to 0.4% by weight of P, and containing 0.01 to 0.5% by weight of at least one of at least one of Cr and Mo. A production method for the aperture grill material for a color picture is characterized by comprising the steps of cold-rolling a low-carbon alloy hot-rolled steel strip containing 0.05 to 2.5% by weight of Cu, 0.001 to 0.4% by weight of P, and 0.01 to 0.5% by weight of at least one of Cr and Mo, and then precipitating the steel strip within a temperature range 300 to 800&deg; C.

Method for manufacturing an aperture grill material for color picture tube

It is an object of this invention to provide a shadow mask material for use in a color picture tube excellent in tensile strength and excellent in high temperature creep strength, a shadow mask and a picture tube incorporating the same. For this purpose, the shadow mask material according to this invention uses a low carbon alloy steel sheet containing from 0.05 to 2.5% by weight of Cu and 0.001 to 0.4% by weight of P, or from 0.05 to 2.5% by weight of Cu, from 0.001 to 0.4% by weight of P and from 0.01 to 1.75% by weight of Ni.

Color picture tube shadow mask material

A purpose of the present invention is to provide material of an aperture grille used for a color picture tube having excellent yield strength, excellent high temperature creep strength and excellent magnetic characteristic, material of an aperture grille used for a color picture tube for improving an occurrence of cracking during a hot rolling step, a method for producing these material, an aperture grille and a color picture tube with the aperture grille. After adding nickel of 0.01 to 1.75 wt % to low carbon alloy steel including copper of 0.05 to 2.5 wt % and phosphor of 0.001 to 0.4 wt %, material according to the present invention is cold rolled. Then, a precipitation treatment is processed at a temperature of 300 to 700&deg; C. Alternatively, the material is cold rolled and secondary rolled after passing through an intermediate annealing at a temperature of 500 to 800&deg; C. Then, the precipitation treatment is processed.

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

An invar alloy steel sheet for shadow masks is provided which has improved etchability, an economical production method, a shadow mask made of the invar alloy steel sheet, and a color picture tube which incorporates the shadow mask. The invar alloy steel sheet is produced by hot working an alloy slab consisting of 33 top 40 wt % nickel with the balance being iron, and then subjecting the slab to a primary cold rolling at a rolling reduction ratio of not more than 80%, annealing at a temperature of at least 550&deg; C., and subjecting the slab to a secondary cold rolling at a rolling reduction ratio of not more than 50%. The invar alloy steel sheet has a percentage of &lcub;100&rcub; texture of 60 to 80%.

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Yamaguchi-ken, Japan

Yasuo Tahara