FE-BASED ELECTROPLATED STEEL SHEET, HOT-DIP GALVANIZED STEEL SHEET, AND METHODS FOR MANUFACTURING SAME
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United States of America Patent
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Issued Date -
Aug 15, 2024
app pub date -
May 17, 2022
filing date -
May 17, 2021
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Abstract
A base steel sheet containing Si in an amount of 0.50 to 3.00 mass % is subjected to an Fe-based electroplating treatment using an Fe-based electroplating solution containing Fe ions and transition metal ions other than the Fe ions to form an Fe-based electroplated layer, and then to an annealing treatment. In the Fe-based electroplating solution, a content of the Fe ions is 1.0 mass % or more and a content of the transition metal ions is 10 to 1000 mass ppm. A coating amount of the Fe-based electroplated layer per one surface of the base steel sheet is 1.0 g/m2 or more. Thus, a steel sheet having high strength and excellent resistance to resistance-weld cracking of a welded portion is obtained.
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