Cobalt-based alloy powder for laser remanufacturing of housing of rolling mill

The invention discloses cobalt-based alloy powder for laser remanufacturing of the housing of a rolling mill, which is characterized by comprising the following components in percentage by mass: 0.8 to 1.4 percent of C, 26 to 32 percent of Cr, 3 to 6 percent of W, 0.6 to 1.4 percent of Mo, 1.2 to 1.8 percent of Ni, 0.2 to 0.6 percent of Mn, 0.8 to 2.4 percent of Si, 1.2 to 4.8 percent of Fe, 0.4 to 1.6 percent of B, 0.2 to 0.6 percent of Ce, 0.2 to 0.6 percent of Hf and the balance of Co. The cobalt-based alloy powder is suitable for the laser deposition of large-area ineffective working face of the housing of the rolling mill, and by depositing the alloy powder, the housing of the rolling mill can be reused and the oxidization resistance, corrosion resistance and washing corrosion resistance of the housing of the rolling mill are improved. The online repair problem of the housing of the rolling mill is solved effectively.