Shengli Oilfield Freet Petroleum Steel Pipe Co., Ltd
At present, the company has five oil casing thread processing production lines, two coupling processing production lines and one oil casing heat treatment production line, covering a wide range of products φ 60mm— φ 508mm H40, J55, K55, N80, L80, C90, T95, P110, q125, hcp110 see                             more+                
Zibo Freet Thermal Tech Co., Ltd.
More than thirty years, the professional manufacturer of the history of heat insulation oil casing production includes the high vacuum heat insulation oil casing, the pre heat insulation oil casing, the aerogel heat insulation oil casing, the geothermal special heat insulation pipe                           more+