The surface hardness of D998 surfacing covered electrode is HRC≥70, and the surfacing metal contains high-strength carbide and various wear-resistant materials. Primary hard phase with uniform hardness. It has strong wear resistance. And it is suitable for operation, stable welding current, small smoke splash and no harmful gases such as fluoride in smoke. After welding, the surface is smooth and smooth, with less slag and beautiful appearance. It is used for spiral stirring knife and mixer blade in brick and tile factory. Repair and surfacing of coal pulverizer hammers, cement plants, exhaust fan blades, vertical kiln trays, mining, steel mills and other industries can achieve twice the result with half the effort after welding.