Composition of rail structure for supporting shadow mask in color CRT

Abstract

Composition of a rail structure that can cut down cost of alloy composition, and enhance strength of the rail structure to minimize defects occurred in a fabrication process of the CRT, consisting of Fe as a main constituent, 22˜27 wt % of Cr, C≦0.02 wt %, Si≦0.40 wt %, Mn≦0.40 wt %, and P≦0.02 wt %, with addition of Mn as required.

What is claimed is:  
     
         1 . A composition of a rail structure consisting of Fe as a main constituent, 22˜27 wt % of Cr, and inevitable impurities.  
     
     
         2 . A composition as claimed in    claim 1   , wherein the composition consists of Fe as a main constituent, 22˜27 wt % of Cr, 1˜3 wt % of Mo, and inevitable impurities.  
     
     
         3 . A composition as claimed in    claim 1    or    2   , wherein the inevitable impurities include C≦0.02 wt %, Si≦0.40 wt %, Mn≦0.40 wt %, and P≦0.02 wt %.  
     
     
         4 . A composition as claimed in    claim 1   , wherein the composition consists of Fe as a main constituent, 25˜27 wt % of Cr, 1˜3 wt % of Mo, Ni≦0.5 wt %, Ti≦0.2 wt %, and the inevitable impurities including C≦0.02 wt %, Si≦0.40 wt %, Mn≦0.40 wt %, and P≦0.02 wt %.  
     
     
         5 . A composition as claimed in    claim 1   , wherein the composition consists of Fe as a main constituent, 22˜24 wt % of Cr, 1˜3 wt % of Mo, Ni≦0.25 wt %, Ti≦0.3 wt %, and the inevitable impurities including C≦0.02 wt %, Si≦0.40 wt %, Mn≦0.40 wt %, and P≦0.02 wt %.