Alloy sheet for shadow mask
US5620535A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1993 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Dec 1, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0733
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An alloy sheet for making a shadow mask consists essentially of 34 to 38 wt. % Ni, 0.07 wt. % or less Si, 0.002 wt. % or less B, 0.002 wt. % or less O, less than 0.002 wt. % N and the balance being Fe and inevitable impurities; PA1 said alloy sheet after annealing before press-forming having 0.2% proof stress of 28 kgf/mm.sup.2 or less; and PA1 a gathering degree of {211} plane being 16% or less. A method for manufacturing an alloy sheet comprises: PA1 a finish cold-rolling step of cold-rolling the cold-rolled sheet at a cold-rolling reduction ratio in response to an average austenite grain size D (.mu.m), the reduction ratio of final cold-rolling R (%) satisfying the equations below; EQU 16.ltoreq.R.ltoreq.75, EQU 6.38D-133.9.ltoreq.R.ltoreq.6.38D-51.0 PA1 a softening annealing step of annealing said cold rolled sheet in a temperature range of 720.degree. to 790.degree. C. for 2 to 40 min. before press-forming and on conditions satisfying the equation below; EQU T.gtoreq.-53.8 log t+806, where T(.degree. C.) is the temperature and t (min.) is the time of the annealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.