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

Abstract

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 wt.% of Cu and 0.001 to 0.4 wt.% of P, and containing 0.01 to 0.5 wt.% of at least one of Cr and Mo. A production method for the aperture grill material for a color picture tube is characterized by comprising the steps of cold-rolling a low-carbon alloy hot-rolled steel strip containing 0.05 to 2.5 wt.% of Cu, 0.001 to 0.4 wt.% of P, and 0.01 to 0.5 wt.% of at least one of Cr and Mo, and then precipitating the steel strip within a temperature range of 300 to 800 DEG C.

Description

technical field [0001] The present invention relates to a shade grid material for a color picture tube, a manufacturing method thereof, a shade grid and a color picture tube incorporating the shade grid. Specifically, the present invention relates to a shade grid material for a color picture tube having excellent tensile strength and high-temperature creep strength as well as excellent magnetic properties, a manufacturing method thereof, a shade grid material, and a color display tube incorporating the shade grid. Elephant tube. Background technique [0002] Since the shade grid used in the color picture tube is welded to the frame under the condition of bearing a large tensile force during processing, the shade grid material used in the color picture tube must have a thickness of at least 60kgf / mm 2 of tensile strength. Thus, as a shade grid material for a currently used color picture tube, a work-hardened mild steel sheet has been used. [0003] In addition, when heat t...

AI Technical Summary

Problems solved by technology

However, in low-carbon steel sheets subjected to intense processing to obtain high yield strength and blackened below the recrystallization temperature, the residual magnetic flux density is as low as less than 8 kilogauss (kG) and the coercive force is as high as 5 O ster (Oe), thus, Br(kG) / Hc(Oe) is as small as about 1.6, which is poor in terms of magnetic shielding materials

[0005] So far, methods for increasing the tensile yield strength of low-carbon steel sheets include solid-solution strengthening methods using carbon or nitrogen, but as the amount of carbon and nitrogen in the steel increases, nitrides or carbides increase the resistance to magnetic wall motion. hindrance, thereby detrimental to the magnetic properties

In addition, methods to increase creep strength include precipitation of carbides, etc. in steel, but most of the precipitates have a large grain size in the order of micrometers and interfere with magnetic wall movement, thereby greatly impairing magnetic properties, so that such methods have no Used as a method of manufacturing the shade grid material used in current color picture tubes