Views: 0 Author: Site Editor Publish Time: 2026-07-23 Origin: Site
Advantages (Core Value of Stainless Steel Replacing Copper Pipes)
1. Corrosion-Resistant Rolled Copper Pipes Copper pipes are highly susceptible to pitting and perforation when exposed to chloride ions, acids, alkalis, seawater, exhaust gases, and chemical vapors; 304/316L stainless steel is suitable for salt spray, weak acid and alkali, and humid corrosive conditions, making it ideal for exhaust gas cooling, seawater heat exchange, and chemical waste heat recovery.
2. High Mechanical Strength High tensile, compressive, vibration, and high-pressure resistance; the pipe wall can be made thin yet still withstand pressure, and it is not easily deformed by impacts; copper pipes are soft and prone to cracking and fatigue leakage under high pressure and vibration conditions.
3. Long-Term Lower Costs Copper prices fluctuate greatly, while the unit price of stainless steel raw materials is stable; copper pipes are scrapped in 1-3 years under corrosive environments, while stainless steel can be used for 5-10 years, significantly reducing replacement and maintenance costs.
4. No Copper Ion Pollution In pure water, food, pharmaceutical, and swimming pool water applications, copper leaching can pollute the medium; stainless steel does not leach heavy metals.
5. High Temperature Resistance and Oxidation Resistance Copper tubes are less prone to oxidation and blackening in high-temperature flue gas and steam heat exchange, while copper tubes are easily oxidized and scaled at high temperatures, leading to decreased thermal conductivity.
Shortcomings (Pain Points That Replacement Must Address)
1. Thermal Conductivity is Much Lower Than Copper Copper's thermal conductivity is approximately 401 W/(m・K); 304 stainless steel is approximately 16 W/(m・K), only about 4% of copper's.
Solutions: Increase heat exchange area, densify fins, use internally threaded stainless steel tubes, and increase medium flow rate to compensate for heat exchange efficiency.
2. High Hardness, Difficult to Process Copper tubes are easy to bend and expand; stainless steel is hard, and ordinary tube expansion equipment cannot expand tightly, easily resulting in thermal resistance between the fins and the base tube.
Solutions: Dedicated stainless steel tube expansion machine, roll forming tube expansion process, thin-walled seamless stainless steel tubes.
3. Susceptibility to Weld Corrosion (High Welding Process Requirements) Ordinary argon arc welding results in chromium-depleted welds, leading to intergranular corrosion in chlorine-containing environments; copper pipe brazing is simple and corrosion-resistant.
Solution: Use 316L low-carbon stainless steel, post-weld solution passivation treatment, and argon-protected welding.
4. Slightly Higher Tendency to Scale Formation The passivation film on stainless steel surfaces has poor hydrophilicity, making it more prone to scale formation at low water flow rates; copper pipes have better self-cleaning properties.
Solution: Increase the flow rate inside the pipe, provide pre-installed cleaning ports, and add an anti-scaling coating.
