St35.8 boiler pipe 1 hot rolled boiler 2 OD:21.30-508mm,WH:2.77-60mm, 5-12m long 3 markets: Middle East, South America, Asia We can produce high temperature and high pressure boiler pipes according to DIN17175 standards. In year 2008, we are awarded the Special Equipment Pressure Certificate & Special Pressure Equipment production permission as belows: They are issued by Chinese Government, so there is no English Version. However i can translate the main content for you: "After experiment, hereby we National Oil Drill and High Pressure Equipment Quality Inspection Center confirm that the boiler pipe produced by Shandong Jialong Pipe Manufacture Co., Ltd can conform to the requests of GB/T 5310. So we authorize Shandong Jialong to produce boiler pipe whose OD is below 125mm."