| TUBIACO SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| TUBIC ELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| TUBIC TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| TUBIKS LIMITED | Private company limited by shares | Live |
| TUBINDON LIMITED | Private company limited by shares | Dissolved |
| HEBEI CANGZHOU HENGTONG TUBING CO., LIMITED | Private company limited by shares | Live |
| Petro & Chem Tubing Industry Limited | Private company limited by shares | Live |
| XI'AN RONGDI TUBING GROUP CO., LIMITED | Private company limited by shares | Dissolved |
| UNILAND TUBING CO., LIMITED | Private company limited by shares | Live |
| VICTORY P.V.C. INDUSTRIAL TUBINGS COMPANY, LIMITED | Private company limited by shares | Dissolved |
| TUBINO LIMITED | Private company limited by shares | Dissolved |