High strength Fe-Ni-Co series alloy for shadow mask

Abstract

The invention improves falling strength of a Fe-Ni-Co alloy without addition of elements for high strengthening. In a Fe-Ni-Co alloy that contains 30 to 35 mass% of Ni, 2 to 8 mass% of Co, 0.50 mass% or less of Mn, and the balance of Fe and inevitable impurities or accompanying elements including 0.10 mass% or less of C, 0.10 mass% or less of Si, 0.05 mass% or less of Al, 0.005 mass% or less of S and 0.005 mass% or less of P and is constructed in a rolling work structure, the high strength Fe-Ni-Co alloy for shadow mask is peculiar to that a recrystallization structure consisting of a grain size number of 9.5 or more is revealed when the Fe-Ni-Co alloy is annealed at 750 deg.C for 15 minutes, and a recrystallization structure consisting of a grain size number of 8.5 or more is revealed when the Fe-Ni-Co alloy is annealed at 850 deg.C for 15 minutes.

Description

technical field [0001] The present invention relates to the fact that even if the shape of the electron beam passing portion of the shadow mask is stamped into a completely flat surface, it is excellent in deformation resistance against drop impact in the state assembled in a cathode ray picture tube, and can maintain low thermal expansion without causing doming. The alloy ribbon for a flat shadow mask of the present invention also relates to the above-mentioned Fe-Ni-Co alloy ribbon for a flat shadow mask whose resistance to deformation by dropping impact is improved by controlling the annealing softening characteristic while maintaining low thermal expansion. Background technique [0002] A color cathode ray picture tube displays images by colliding electron beams emitted from an electron gun onto phosphors inside a glass panel. It is the deflection yoke that controls the direction of the electron beam by magnetic force. In order to make electron beams collide with predet...

AI Technical Summary

Problems solved by technology

However, when only Co2 to 7% by mass is contained, the drop impact cannot be resisted when the shadow mask annealed before pressing is made flat.

In addition, Patent Document 2 proposes a proposal in which Ti, Zr, B, Mo, Nb, N, P, and Cu are contained in an Fe-Ni alloy containing 34 to 38% by mass of Ni. One or two or more, with a total of 0.01 to 1.0% by mass, to prevent longitudinal bending due to impact during assembly, but when the coefficient of thermal expansion is greater than 10×10 -7 / °C, when the shadow mask is set to a flat surface, it cannot meet the requirements for suppressing color shift