HOT-DIP AL-BASED ALLOY COATED STEEL SHEET EXCELLENT IN WORKABILITY

摘要

[Problem] The invention is intended to improve the galling resistance of the hot-dip Al-based alloy coated layer of a hot-dip Al-based alloy coated steel sheet.;[Solution] Provided is a hot-dip Al-based alloy coated steel sheet excellent in workability that comprises a hot-dip Al-based alloy coated layer of a composition containing 1.0 to 12.0 mass % of silicon and 0.002 to 0.080 mass % of boron and formed on a surface of a substrate steel sheet, the coated layer having an IMAX/I0 ratio of 2.0 or more as measured by GDS (glow discharge optical emission spectrometry) analysis from the outermost surface into the depth of the coated layer, where IMAX is the maximum detection intensity of boron in regions with a sputter depth of 0 to 1.0 μm, and I0 is the average detection intensity of boron within a sputter depth of 1.0 to 5.0 μm.

主权项

1. A hot-dip Al-based alloy coated steel sheet excellent in workability that comprises a hot-dip Al-based alloy coated layer of a composition containing 1.0 to 12.0 mass % of silicon and 0.002 to 0.080 mass % of boron and formed on a surface of a substrate steel sheet, the coated layer having an IMAX/I0 ratio of 2.0 or more as measured by GDS (glow discharge optical emission spectrometry) depth analysis from the outermost surface into the depth of the coated layer, where IMAX is the maximum detection intensity of boron in regions with a sputter depth of 0 to 1.0 μm, and I0 is the average detection intensity of boron within a sputter depth of 1.0 to 5.0 μm.