Abstract: A middle chromium austenitic alloy FAW electrode used for hardface welding of impact wear-resistant has been studied in this paper.It has been shown that the technological property of FAW electrode and crack-resistance are fine and the work hardening rate of its hardface weld is higher than that of manganese steel materials. Base on the work hardening test, impact wearing test and analysis results of their mechanisms, it is shown that the deformation twinning hardening and the dynamic carbide ageing are main forms of the strengthening of FAW alloy, and the chisel cuting is main form of wearing off of the hardaface metal.