HIGH STRENGTH LOW THERMAL EXPANSION Fe-Ni-Co BASED ALLOY THIN STRIP FOR SHADOW MASK HAVING EXCELLENT MAGNETIC PROPERTY

摘要

PURPOSE: To provide an Fe-Ni-Co based alloy which combines high strength and excellent magnetic properties, and has a low thermal expansion coefficient. CONSTITUTION: The Fe-Ni-Co based alloy thin strip for a shadow mask having high strength and excellent magnetic properties, and maintaining a low thermal expansion coefficient comprises 30 to 35% Ni, 2 to 6% Co, 0.1 to 0.4% Nb and 0.2 to 0.5% Mn, and the balance Fe with inevitable impurities, and in the inevitable impurities, the content of C is controlled to =0.005%, S to =0.002% and N to =0.005%. The crystal grain size before etching piercing is 7.0 to 10.0 by a crystal grain size number prescribed in JISG0551, and the total content of precipitates and inclusions of 0.2 to 5 μm is 0.5 to 1.5 μg/mm¬3.