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School of Advanced Materials Science and Engineering, Sungkyunkwan University,Seobu-ro 2066, Suwon 440-746, Korea(Received February 14, 2014; Revised February 21, 2014; Accepted February 24, 2014)A low carbon steel, Fe-2.25%Cr steel (ASTM T22), and Fe-2.25%Cr-1.6%W steel (ASTM T23) were aluminized by hot dipping into molten Al baths. After hot-dipping, a thin Al-rich topcoat and a thick alloy layer formed on the surface. The topcoat consisted primarily of a thin Al layer that contained a small amount of Fe, whereas the alloy layer consisted of Al-Fe intermetallics such as Al |