| 摘要 |
A steel sheet for a shadow mask which is inexpensive and has stable etching characteristics, a shadow mask, and a picture tube incorporating the shadow mask are disclosed. The steel sheet contains at least 0.015 weight % of Cu and the balance of Fe. When an aluminum killed steel having a Cu content which is higher by at least 0.02 weight % than the S content is used as this steel sheet, the characteristics can be further improved. This steel sheet is produced through hot rolling, pickling, annealing, primary cold rolling, decarburization annealing, and finish cold rolling in this order. A shadow mask using this steel sheet has excellent etching characteristics. A picture tube incorporating this shadow mask has extremely high sharpness without blur of colors. |
