Abstract: High boron cast steels are novel wear resistance materials mainly alloyed by B element. Focused on the Fe2B phases in high boron cast steels, the effects of alloying elements on the microstructures and mechanical properties are reviewed. Besides, high boron cast steels also show superior corrosion resistance and corrosion-wear resistance of molten Zn and Al. Based on the author′s recent progress referring to novel high boron cast steels, their corrosion resistance and corrosion-wear resistance of molten Al were introduced. Borides played a key role in improving the high boron cast steels′ corrosion resistance and corrosion-wear resistance of molten Al. Cr-rich Fe2B and Mo-rich Fe2B act differently during the corrosion of molten Al. A periodic layered structure is formed during the interfacial reaction between Cr-rich Fe2B and molten Al, while Mo-rich Fe2B fractures and no chemical reaction happens. Preferential dissolution happens during the corrosion-wear of the primary Cr-rich Fe2B in molten Al. Then, they crack and peel off under the action of wear. However, the corresponding mechanism needs to be investigated further. At last, the development trends of high boron cast steels were also proposed.
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