| 摘要 |
PURPOSE:To produce a flat tension shadow mask material having high yield strength and high elastic elongation by heating an Fe-Cu alloy having a specified compsn. to austenitize the structure, cold working the alloy and carrying out specified heat treatment. CONSTITUTION:An alloy consisting of 1.0-4.0wt.% Cu and the balance Fe with impurities is heated to >=830 deg.C to austenitize the structure and a C supersatd. solid soln. is formed in the alpha-iron by quenching. The quenched alloy is cold worked at >=10% rate to cause work hardening and the cold worked material is heated to 300-700 deg.C. By this heating, the strain is relieved and a primary solid soln. of Cu is precipitated to precipitation-strengthen the material. Thus, a flat tension shadow mask material having >=50kgf/mm<2> offset yield stress strength at 0.2% permanent set at room temp. and >=0.1% elastic elongation and hardly causing plastic deformation is obtd.
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