High pressure elbow not only has good pressure resistance, but also needs to have other excellent characteristics in different pipeline systems. for example, in the concrete conveying pipeline, the high-pressure elbow in the mud conveying pipeline must not only be able to withstand high pipeline pressure, but also have good wear resistance. In addition to bearing high pipeline pressure, the high-pressure elbow in the chemical raw material transportation pipeline system also has excellent corrosion resistance and acid and alkali resistance.