| 摘要 |
PURPOSE: Provided is a Fe-Ni based alloy for a press forming die perfect flat mask improved in strength(falling impact deformation resistance) and having low thermal expansibility. CONSTITUTION: The present Fe-Ni based alloy for a press forming die perfect flat mask maintaining low thermal expansibility, and whose proof stress and Young's modulus are improved as well contains Ni 33-37 wt.%, Mn 0.001-0.1 wt.%, voluntarily Co less than 0.01-2 wt.% and further contains one or more kinds selected from Nb 0.01-0.8 wt.%, Ta 0.01-0.8 wt.% and Hf 0.01-0.8 wt.% by 0.01 to 0.8% in total, and the balance Fe with inevitable impurities, in which, preferably, as the impurities, the Fe-Ni based alloy contains C less than 0.01 wt.%, Si less than 0.04 wt.%, P less than 0.01 wt.%, S less than 0.01 wt.% and N less than 0.005 wt.%. The flat mask and color cathode-ray tube use the same.
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