In the lithium battery industry, liquid heating tubes are primarily used for scenarios such as heat transfer oil heating, auxiliary heating for electrolytes, and cleaning solution heating. The core selection principles are high-temperature resistance, corrosion resistance, non-contamination of the medium, and suitability for the harsh conditions of lithium battery production. Common materials and applicable scenarios are as follows:
1.321 stainless steel
This is the mainstream material for heating tubes in the lithium battery industry's thermal oil furnaces, suitable for conventional thermal oil heating conditions (temperature ≤ 300°C).
Features: Contains titanium, exhibits strong resistance to intergranular corrosion, withstands prolonged high-temperature cycling erosion of heat transfer oil, maintains excellent material stability without impurity leaching that could contaminate the heat transfer oil, and is suitable for preheating, drying, and other stages of slurry preparation before sintering lithium battery cathode and anode materials.
Note: Not applicable for scenarios involving contact with electrolytes or highly corrosive cleaning solutions.
2.316L stainless steel
Suitable for applications involving heat transfer oil with trace impurities or slightly elevated heating temperatures (≤350°C), as well as for heating weakly corrosive cleaning solutions.
Features: Enhanced with molybdenum on the basis of 304 stainless steel, it offers superior corrosion resistance and high-temperature performance compared to 321 stainless steel, along with strong resistance to pitting corrosion. Suitable for heat transfer oil heating in slightly complex conditions during lithium battery production or for heating battery shell cleaning solutions.
3. TA2 Pure Titanium Alloy
For heating scenarios involving electrolyte-related liquids and strongly acidic cleaning solutions, it serves as the core material for corrosive medium heating in the lithium battery industry.
Features: Exceptionally strong corrosion resistance, capable of enduring long-term erosion by lithium battery electrolytes (containing carbonates and lithium salts) and strong acid cleaning solutions. High chemical stability ensures no reaction with media, preventing electrolyte contamination and maintaining battery performance.
Note: The cost is higher than that of stainless steel material, and special seals (such as fluororubber) are required to prevent leakage.
4. Polytetrafluoroethylene (PTFE, commonly known as Teflon)
For heating strongly corrosive liquids at room to moderate temperatures (≤200°C), such as strong acid or alkali solutions used in lithium electrode sheet cleaning.
Features: Extremely chemically inert, almost unreactive to any acid or alkaline medium, excellent insulation, and does not produce metal ion contamination when heated.
Note: The temperature resistance limit is relatively low, and the thermal conductivity is small. A reasonable power density must be designed to avoid localized overheating and subsequent coating damage.
Additional Considerations for Lithium Battery Industry Selection
• Prioritize heating tubes with flange sealing structures to meet the sealed heating requirements of lithium battery equipment and prevent the leakage of thermal oil or electrolyte.
• For high-power thermal oil heating applications, it is recommended to choose heating tubes processed from seamless pipes to enhance pressure resistance and deformation resistance.
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Post time: Jan-21-2026
