Composite carbide reinforced martensite welding wire for surfacing of heating surface pipe and preparation method thereof

The invention discloses a composite carbide reinforced martensite welding wire for surfacing of a heating surface tube and a preparation method thereof, the composite carbide reinforced martensite welding wire comprises powder and a welding skin, the powder comprises the following components in percentage by mass: 15.0%-20.0% of Cr, 4.0%-6.0% of Ni, 5.0%-8.0% of Mo, 6.0%-8.0% of B, 1.0%-2.0% of C, 6.0%-8.0% of Nb, 1.0%-2.0% of Ti, 0.2%-0.4% of Mn, 0.2%-1.0% of Y2O3 and the balance of Fe, and the sum of the mass percentages of the components is 100%. According to the welding wire, the comprehensive performance of a surfacing layer is improved by adding the elements such as B, Nb, Ti and C and by means of in-situ generation of multiple composite carbides; the welding wire is good in welding performance, small in splashing and good in high-temperature erosion resistance. 本发明公开了受热面管堆焊用复合碳化物强化马氏体焊丝及其制备方法，包括药粉和焊皮，其中药粉按质量百分比由以下组分组成：Cr为15.0%~20.0%，Ni为4.0%~6.0%，Mo为5.0%~8.0%，B为6.0%~8.0%，C为1.0%~2.0%，Nb为6.0%~8.0%，Ti为1.0%