A preliminary study on erosion-corrosion of carbon steel with ASTM specification of A106 Grade B and low-alloys with A335 P11(1Cr-1/2Mo) and P22(21/4Cr-1Mo) was carried under aqueous accelerating conditions of pH 8.0±0.3 without dissolved oxygen at 130 ℃ in an erosion-corrosion test loop. The weight losses on the surfaces of A106 carbon steels appeared to be dependent upon flow rate and turbulence intensity. The weight losses on the surfaces of P11 and P22 low-alloy steels, measured after 500 hours, showed approximately half of that of A106 carbon steel.