The Concrete Pump Boom Elbow is made of special quality steel which is quenched and carried out carburizing chemical treatment on the inner wall.The concrete pump pipes and elbows are suffering serious abrasion & impact problems because of the high speed pump concrete. The normal carbon steel pipes under such high abrasion and impact condition are very easy to wear out. The hardness of the flanged bushings can reach 58-60 degrees and the serving life of pipeline can increase 3-5 times,which enables users to save time and cost, enhancing the