Fe-Cr-B-C　system　alloys　with　different　chromium　contents　of　12%,　14%,　16%　and　18%　were　deposited　on　Q235　steel　by　flux-cored　wire　arc　welding,　and　then　the　hardfacing　alloys　were　subjected　to　heat　treatment　at　600　for　8　h.　The　influence　of　chromium　content　on　microstructure　and　wear　resistance　of　the　hardfacing　alloys　as-welded　and　heat　treated　were　investigated.　The　results　show　that　the　main　hard　phases　of　the　hardfacing　alloys　are　(Fe,　Cr)23(B,　C)6particles.　The　matrix　in　as　welded　state　is　composed　of　martensite　and　residual　austenite.　The　microstructure　of　the　matrix　changes　to　tempered　sorbite　after　heat　treatment.　The　(Fe,　Cr)23(B,　C)6phase　is　stable　when　the　chromium　content　reaches　up　to　14%.　The　content　of　Cr　has　significant　influence　on　the　high　temperature　wear　resistance　of　the　hardfacing　alloys.　After　heat　treatment,　the　relative　wear　resistance　of　the　hardfacing　alloy　containing　12%　Cr　decreases　from　10.65　to　2.08,　only　19.5%　of　the　wear　resistance　of　the　hardfacing　alloy　in　as　welded　state,　while　the　relative　wear　resistance　of　the　hardfacing　alloy　with　16%　Cr　is　9.08　after　heat　treatment,　indicating　a　good　wear　resistance.　©,　2015,　Editorial　Office　of　Transactions　of　Materials　and　Heat　Treatment.　All　right　reserved.