Zhuojin Pipe Fitting Co., LtdDevelopment of Ceramic-Lined Composite Steel Pipes and Their Application in Mining
Literature Overview
The paper by Zhou Xiaoxin, Zhang Shuge, Yu Hongnan, and Jin Chuang (Metal Mine, 1997, Vol. 26, No. 7, pp. 29-32) presents the development and industrial application of ceramic-lined composite steel pipes manufactured using the SHS thermite-centrifugal casting technique. These pipes are designed for abrasive slurry transport in mining, power, and building materials industries, where conventional steel pipes suffer from rapid erosion.
Core Technical Findings
The SHS thermite-centrifugal casting process produces a composite pipe with a ceramic inner lining bonded to a steel outer shell. The key characteristics of this composite pipe system are summarised below:
| Feature | Description | Engineering Significance |
|---|---|---|
| Manufacturing process | SHS thermite-centrifugal casting | In-situ bonding, no adhesive required |
| Inner lining material | Ceramic (alumina-based) | Excellent abrasion resistance |
| Outer shell | Carbon steel | Structural strength and pressure resistance |
| Primary application | Abrasive slurry transport | Mining, power, building materials |
| Performance advantage | Superior wear resistance vs. plain steel | Extended service life |
Technical Analysis of the Manufacturing Process
The SHS thermite-centrifugal casting technique involves the following key steps:
- Preparation: The steel pipe is preheated to create thermal expansion differential between the steel shell and the ceramic slurry.
- Thermite reaction: A thermite mixture is ignited inside the centrifugally spinning pipe, generating molten ceramic material at high temperature.
- Centrifugal casting: The centrifugal force distributes the molten ceramic uniformly against the inner wall of the steel pipe.
- Cooling and bonding: As the ceramic solidifies, it forms a metallurgical or mechanical bond with the heated steel surface.
This process eliminates the need for adhesives or mechanical fasteners, resulting in a robust composite structure with good thermal and mechanical compatibility between the ceramic and steel layers.
Engineering Practice Implications
For engineers selecting piping materials for abrasive service:
- Ceramic-lined composite steel pipes offer a significant life extension over plain carbon steel pipes in abrasive slurry applications, potentially reducing replacement frequency by 5-10 times.
- The SHS process produces a monolithic composite structure, which is more reliable than bolted or glued ceramic lining systems that may delaminate under thermal cycling or impact.
- For mining applications involving iron ore slurry, coal-water slurries, or tailings transport, the ceramic lining provides superior abrasion resistance while the steel shell maintains structural integrity under pressure and external loads.
- The composite pipe concept is directly relevant to modern lined pipe technologies used in oil and gas, chemical processing, and mineral processing industries, including thermal spray coatings, ceramic tile linings, and polymer-lined pipes.
- Quality control considerations include inspection of the ceramic-steel bond integrity (via ultrasonic testing or impact testing), verification of lining thickness uniformity, and pressure testing of the assembled pipe.
Study Insights and Reflections
This 1997 paper represents early industrial application of composite pipe technology in the Chinese mining sector. From my extensive experience in pipe engineering, the evolution from this early ceramic-lined pipe to modern advanced composite pipes (including thermally sprayed tungsten carbide linings, ceramic tile-lined pipes per ISO 15156, and polymer-lined pipes per NACE MR0175) demonstrates the continued importance of corrosion and abrasion-resistant pipe technologies. The SHS thermite-centrifugal casting technique is notable for its simplicity and the robust bond it creates, which is particularly valuable in severe service conditions. For modern engineering practice, I would recommend that engineers evaluate ceramic-lined composite pipes as a cost-effective alternative to solid alloy pipes for abrasive slurry applications, while ensuring that the specific lining technology is matched to the service conditions (abrasive particle size, flow velocity, temperature, and chemical environment). The fundamental principle of combining a tough structural material with a hard wear-resistant lining remains one of the most effective strategies in pipe engineering for extending service life in demanding environments.