•Erosion behaviors of five high chromium cast iron alloys were investigated.•Erodent particles were ferric oxide specks with the hardness of 657 HV.•Microstructure consists of primary Cr7C3 and eutectic.•Erosion resistance is dominated by bulk hardness of hardfaced alloys.•Erosion rate for a sample containing Mo, Nb, V, and W is the lowes. Depositing hardfacing material onto a surface with the welding method is a common way of protecting surfaces against wear damage. In this study, five high chromium hardfacing alloys were used to prepare samples for the gas blasting erosion test. Erodent particles were ferric oxide specks with a hardness of 657 HV and an average size of 260 μm. Impinging stream eroded the surface of samples with the gas flow of 100 m/s at an angle of 30° while the particle feed was increased from 140 to 630 g. The results indicated that erosion resistance is dominated by bulk hardness of hardfaced alloys. In addition, the erosion rate for a sample containing Mo, Nb, V, and W was the lowest since it had the highest bulk hardness among all other samples.