... :0-5504.inside nominal diameter:10-1200mm5.Material:stainless steel, carbon steel, alloy steel(Q235,20#,16Mn,ST45.8,12CrMoV,15CrMo,ooCr17Ni12Mo2, ... forging flange.Shandong Qingyun Yitong Tubes and Fitting Manufacturing Co,Ltd is a special steel tubing company which combines scientific ... petrochemical. The company owns 268 staff, covering 90,000 square meters. It has the annual produce capacity of 8, ...