High-manganese hot-dip aluminum-coated steel sheet having excellent coating adhesion

  • US 10,968,506 B2
  • Filed: 12/23/2016
  • Issued: 04/06/2021
  • Est. Priority Date: 12/24/2015
  • Status: Active Grant
First Claim
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1. A high-manganese hot-dip aluminum-coated steel sheet comprising:

  • a base steel sheet including, by weight, 5 to 35% of Mn, 0.3 to 6% of Al, 0.1 to 1.2% of Si, and a balance of Fe and inevitable impurities;

    a hot-dip aluminum-coated layer formed on a surface of the base steel sheet and including, by weight, 3 to 12% of Si, 0.1 to 10% of Mg, and a balance of Al and inevitable impurities; and

    an alloy layer formed at an interface between the base steel sheet and the hot-dip aluminum-coated layer, the alloy layer consisting of, by weight, 40 to 70% of Al, 2 to 13% of Si, 3 to 9% of Mn, 1% or less of Mg, and a balance of Fe and inevitable impurities,wherein the alloy layer has a thickness of 0.1 to 10 μ

    m and includes an Fe—

    Al—

    Si—

    Mn-based alloy phase.

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