Fe-Cr-C　hardfacing　layers　on　Q235　mild　steel　were　produced　by　submerged　arc　welding　method.　The　microstructure　and　worn　surface　of　the　overlayer　were　examined　by　means　of　optical　microscope,　scanning　electron　microscopy　(SEM)　and　transmission　electron　microscopy　(TEM).　Abrasive　wear　resistance　was　tested　on　a　MLS-225　wet　sand/rubber　wheel　tester.　The　results　show　that　morphology　of　primary　carbides　and　eutectic　carbides　in　the　Fe-Cr-C　hardfacing　alloy　are　not　changed　by　heat　treatment.　The　hardness　of　the　overlayer　is　lowered　by　25%　after　heat　treatment　compared　to　that　under　as-welded　condition.　The　hardness　of　primary　carbides　is　slightly　lowered　by　5%　under　the　same　heat　treatment.　The　matrix　hardness　is　largely　reduced　about　39%　by　the　heat　treatment.　The　abrasion　property　of　the　hardfacing　alloy　is　greatly　affected　by　heat　treatment.　After　heating　at　850°C~1000°C　for　30　minutes　the　relative　abrasion　resistance　of　the　alloy　can　only　reach　to　16%~32%　compared　to　that　for　the　as-welded　condition.　The　mismatch　of　the　carbides　and　the　matrix　is　responsible　for　the　decrease　of　abrasive　wear　property.