Pipe leakage powder, ash leakage is the most headache of the power plant, which not only affects the economic benefits of the enterprise, downtime maintenance to increase the labor intensity of the staff, but also seriously affect the environmental health of the plant to meet the standard has brought great difficulties. Our factory adopts the most advanced resin sand molding and centrifugal casting, for the pressure is not big, the batch is small workpiece using sand casting, for the pressure is big, and the batch is big workpiece using centrifugal casting. The bends are cast with eccentric casting to ensure wear resistance. The material is high-strength rare earth alloy wear-resistant steel (ZG40CrMnNiMoSiRe).