Fe-Cr-C　based　hardfacing　alloys　were　produced　by　the　CO2　gas　shielded　welding　process　utilizing　the　flux　cored　wires　of　1.6　mm　in　diameter　on　low-carbon　steel　substrates.　The　hardfacing　alloys　contained　the　carbon　contents　in　the　range　of　1.0%-3.0%,　chromium　contents　of　15%-25%,　boron　contents　of　0%-2.0%.　The　effects　of　boron　carbide　contents　on　the　microhardness　and　wear　resistance　of　the　hardfacings　were　studied.　The　results　show　that　the　hardness　increased　from　57.1　HRC　to　65.2　HRC　as　the　boron　contents　reaches　up　to　2.0%.　Compared　without　boron　addition,　the　hardness　increases　by　14.2%　times.　The　relative　wear　resistance　increases　from　3.5　to　18.0　times.　By　using　of　the　optical　microscope　(OM),　scanning　electron　microscope　(SEM)　and　X-ray　diffraction　(XRD),　the　microstructures　and　distribution　of　carbides　in　the　matrix　were　investigated.　The　microstructures　of　metallic　matrix　are　composed　by　ferrite,　austenite,　(Fe,　Cr)7C3,　Fe2B,　etc.　The　additions　of　boron　carbide　in　the　wires　can　improve　the　microstructure　of　the　matrix　of　the　hardfacing　alloys　and　the　quantities　of　the　carbides.　The　distribution　of　(Fe,　Cr)7C3　particles　are　uniformly　dispersed.