Laser direct manufacturing is a novel manufacturing technology. Fe-Cr-B-Si-C alloy powders are used in laser direct manufacture to make single track laser cladding layer and thin wall cylinder. The microstructure, phase structure and mechanical properties of single track cladding layer and thin wall cylinder are investigated by optical microscopy (OM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and nano-indentation techniques. The results show that laser direct forming metal parts are fully dense, and that there are no defects such as crack and pore. There is somewhat coarsening during interlayer microstructure, which can lead to weak mechanical properties. However, the whole properties of the thin wall cylinder may still satisfy the real part performance requirements. The change of laser scanning direction is beneficial to molten pool stirring, which leads to smashed dendrite structure in favor of microstructure homogenization.