Hot-stamped steel
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United States of America Patent
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May 22, 2018
Issued Date -
N/A
app pub date -
Mar 31, 2015
filing date -
Mar 31, 2014
priority date (Note) -
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Abstract
Hot-stamped steel includes: a steel base metal including a tempered portion having hardness corresponding to 85% or less of the highest quenching hardness defined as a Vickers hardness at a depth position spaced away from a surface layer by ¼ times a sheet thickness in a case of performing water quenching after heating at a temperature equal to or higher than an Ac3 point and retention for 30 minutes; and a Zn coating layer formed on the tempered portion of the base metal. The Zn coating layer includes a solid-solution layer including a solid-solution phase containing Fe and Zn that is solid-soluted in Fe, and a lamella layer including solid-solution phase and a capital gamma phase. In the Zn coating layer, an area ratio of the lamella layer is 30 to 100% and an area ratio of the solid-solution layer is 0 to 70%.
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