- Hebei Shengtian Seamless Steel Pipe Group Co., Ltd.
- Weifang Special Steel Group Co., Ltd.
- Hengyang Hongda Precision Manufacturing Co., Ltd.
- Shandong Yong’an Haoyu Tube Co., Ltd.
- Fushun Special Steel Co., Ltd.
- Hebei Yichen Industrial Group Co., Ltd.
- Xuzhou Jinhong Iron & Steel Co., Ltd.
- Shanxi Zhongyang Iron & Steel Co., Ltd.
- Zhangjiagang Huagang Industrial Co., Ltd.
- Ningbo Huanchi Pipe Co., Ltd.
- Ningbo Wanrong Special Steel Co., Ltd.
- Wenzhou Yixian Food Co., Ltd.
- Huzhou Renxin Bearing Steel Pipe Co., Ltd.
- Zhejiang Tuowei Auto Parts Co., Ltd.
- Jinqiao Welding Materials (Jiangsu) Co., Ltd.
- Shengde Xintai New Materials Co., Ltd.
- Shandong Luli Iron & Steel Group Co., Ltd.
- Shanxi Zhongyang Iron & Steel Co., Ltd.
- Panjin Steel Pipe Co., Ltd.
- Suzhou Sicui Welding Technology Institute Co., Ltd.
- Jiangsu Xin Changjiang Seamless Steel Pipe Co., Ltd.
- Kobelco Special Steel Wire (Pinghu) Co., Ltd.
- Zhejiang Lunbao Metal Pipes Co., Ltd.
- Tianjin Yinlong Prestressed Materials Co., Ltd.
- Hebei Huierxin New Materials Co., Ltd.
- Jiangsu Poly Precision Electromechanical Co., Ltd.
- Jiangsu Huacheng Industrial Pipe Co., Ltd.
- PT. CT Advance Technology
- PT. Alam Lestari Unggul