CAN STEEL SHEET AND METHOD FOR PRODUCING SAME
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United States of America Patent
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Issued Date -
May 2, 2024
app pub date -
Nov 15, 2021
filing date -
Jan 27, 2021
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Abstract
There is provided a steel sheet for cans including, on a surface of a steel sheet, a chromium metal layer and a hydrated chromium oxide layer stacked in this order from the steel sheet side. The chromium metal layer has a coating weight of 50 to 200 mg/m2, and the hydrated chromium oxide layer has a coating weight of 3 to 30 mg/m2 in terms of chromium amount. The chromium metal layer includes a base portion of flat plate shape and granular protrusions provided on the base portion. At least 20% of the granular protrusions has a circularity C of 0.85 or less. The circularity C is expressed by C=4πA/U2, when the outer perimeter of a projection image of a granular protrusion is represented by U, and the area thereof is represented by A.
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