GI steel pipe Manufacture price Grade:Q195-Q235,Q345,20#,45# etc. OD: ... , SCH10-40, ASTM A500, API5L, API5CT, DIN2440 and EN10129 GI steel pipe are used for high pressure fields such as oil, water ... ,gas etc transmission pipelines, and also for projects.Tianjin Lange Steel Pipe Manufacturing Co., Ltd.Tel:86-22-59593382Fax:86-22-59516266 GI ...