According　to　the　characteristics　of　electric　arc　spraying　technology　and　abrasion　of　boiler　piping,　a　flux-cored　wire　SMD　45　for　electric　arc　spraying　is　developed.　The　experimental　results　show　that　the　surface　hardness　of　the　coating　reaches　60　∼　65　HR　and　the　adhesive　strength　between　the　coating　and　base　is　23　∼　28　MPa.　The　wearability　of　the　coating　sprayed　by　the　wire　is　5　times　than　that　of　ordinary　steel　pipe.　Applying　the　wire　to　the　heated　surface,　the　life　of　the　economizer　pipe　is　doubly　increased.　No　local　desquamation,　rust　and　abrasion　can　be　examined　during　more　than　one　year＇s　service.