Laser processing method for prolonging service life of conveying roller of continuous annealing furnace by using alloy powder

The invention relates to a laser processing method for prolonging the service life of a conveying roller of a continuous annealing furnace by using alloy powder. The alloy powder used for laser cladding comprises the following components: 0.24-0.26 wt% of C; cr: 24.5 to 25.5 wt%; co: 29.8 wt% to 30.2 wt%; mn: 0.2 to 0.30 wt%; 2.9 to 3.1 wt% of Mo; 0.21 to 0.23 wt% of Nb; si: 0.7 to 1.1 wt%; o: less than or equal to 0.015 wt%; s: less than or equal to 0.030 wt%; less than or equal to 0.030 wt% of P; the invention further discloses a laser processing method for prolonging the service life of the conveying roller of the continuous annealing furnace by using the alloy powder, the high-temperature red hardness and the cracking resistance of a laser coating are improved while the cost is reduced, and the service life of the conveying roller of the continuous annealing furnace is prolonged. 本发明涉及一种利用合金粉末提高连续退火炉输送辊寿命的激光加工方法，所述激光熔覆使用的合金粉末组成成分包括C：0.24-0.26wt％；Cr：24.5-25.5wt％；Co：29.8-30.2wt％；Mn：0.2-0.30wt％；Mo：2.9-3.1wt％