This product is made of the special quality steel, after being quenched and carried on the carburizing chemical treatment on the inner wall, the hardness degree of the flanged bushings can reach 58-60 degrees, and the serving life of pipeline can increase by 3-5 times, which can enable users save time and costs, remove from the trouble of changing the tube regularly, and enhance the production efficiency. Dongchang Hardening Concrete Pumping Pipe Specification Structure: Name structure HRC Thickness mm structure Sketch Map Base Material pearlite&ferrite 23 3.2 Abrasionresist layer/Crakresist layer Hatciemng Layer martensite 55-62 1.8 Life Comparison & quality/price ratio: Name Material Structure Characteristic life(squre) Lift Ratio Price Ratio Price(RMB/m) quality/price ratio Normal 20 monolayer low cost,rapid abrasion,short lift 7000-8000 1 1 100 1 High Quality Alloysteel monolayer High cost,long lift 15000-20000 2.5 1.5 150 1.6 Hardening(doublelayer) Alloysteel double Higher cost with abrasion resist wall and crack resist ektexine,4-5 times longer life 38000-45000 5.6 2 200 2.8