Cangzhou Yougang Tube Industry Co., Ltd.

Yanshan Tianyuan Steel Tube Manufacture Co., Ltd.

Hebei Shengxuan Pipeline Manufacture Co., Ltd.

Cangzhou Guangyi Pipeline Manufacture Co., Ltd.

Cangzhou Haima Pipeline Equipment Co., Ltd.

Hebei Hongshang Pipeline Equipment Manufacture Co., Ltd. (No.2 Factory)