The new metal-cored wires with Fe-Si-Mn-Ti-B microalloyed series were prepared to meet demands of GMAW surfacing rapid forming technology. The microstructure and performance characteristics of parts produced with them are both investigated. Its continuous metallographic microstructure along the deposition height direction shows obvious layered characteristic due to the special thermal cycles and cooling conditions. The microhardness values of intermediate sections of the part are higher than those of surface sections, which closely relates to their microstructure. The tensile strength, yield strength and broken elongation percentage of the part are 575MPa, 530 MPa and 10.14%, respectively. The fracture mechanism of the part belongs to quasi-cleavage crack. Therefore, the self-made metal cored wires are acceptable for forming some structure parts.