Abstract: The high-chromium cast iron type self-shielded metal cored wire(SSMCW) for hard facing with good operative performance and appearance was developed.The hardness of deposited metal exceeds HRC60,and the wearing resistance is 21 times higher than that of Q235 steel.The mechanism of self-shielding was researched.When manganese content arrives at 5wt% in wire,porosity can be avoided,while TiFe content exceeds 10wt%,pits will appear in the weld of SSMCW.The microstructure of deposited metal consists of martensite and a little residual austenite,and the abrasive resistant hard phase M₇C₃ distributes uniformly in martensite matrix.