... DN150,DN175 etc 2.Material:45Mn2,ST52,37Mn5 and alloy. 3.Length:1m-9m 4.Life:50000CBM. ... pipes, elbows, reducers, couplings, rubber hoses, cleaning ball and so on.2.Our products are super quality in China ... , XUGONG,CHUTIAN, HAINUO etc and recognized by them.3.It is quenched and carried out carburizing chemical treatment ... 's inner wall can reach 60~65 degrees and the serving life of it can increase 3 ...