The material selection of heat exchanger tube should consider multiple factors such as corrosion resistance, strength, and cost. Different working conditions require different tube materials.

Corrosion resistance
In the working environment of the heat exchanger, the inside of the pipe will be exposed to various liquids and gases, and these media contain corrosive substances to varying degrees. Therefore, the corrosion resistance of the heat exchanger tube material is one of the key factors in evaluating its quality.
1. Stainless steel: good mechanical properties, strong seawater corrosion resistance, and high price;
2. Copper alloy: good thermal conductivity and strong corrosion resistance, but high cost;
3. Titanium alloy: excellent performance in corrosive media such as strong acids and alkalis, and high price;
4. Nickel-based alloy: good corrosion resistance and high temperature resistance, but high price.
Different corrosion resistance requirements require different materials. For example, materials such as titanium alloys or nickel-based alloys can be selected for high acid and alkali corrosion resistance.

Strength
The heat exchanger needs to withstand certain pressures and loads during work, so the strength of the tube also needs to be considered.
1. Stainless steel: high strength, but prone to stress corrosion cracking;
2. Copper alloy: relatively soft, easy to cause joint leakage;
3. Titanium alloy: high strength, superelastic, not easy to deform;
4. Nickel-based alloy: high strength, but low hardness, easy to wear.
When choosing the material of the heat exchanger tube, it is necessary to comprehensively consider factors such as the strength and softness of the tube and choose the appropriate material.

Cost
The cost of the heat exchanger tube material is also a factor that needs to be considered.
1. Stainless steel: moderate cost, excellent performance, and wide range of applications;
2. Copper alloy: high cost, but good thermal conductivity, suitable for high-demand heat exchangers;
3. Titanium alloy: high cost, but has good corrosion resistance and strength, suitable for industrial fields with high corrosion resistance requirements;
4. Nickel-based alloy: high cost, but corrosion resistance, high temperature resistance, suitable for heat exchangers under high temperature and high pressure.
The cost of different materials is different, and it needs to be comprehensively considered based on factors such as production cost and installation and maintenance cost.

Other factors
In addition to the above factors, there are some other factors that need to be considered:
1. Thermal conductivity: The thermal conductivity of the material will affect the heat transfer efficiency of the heat exchanger;
2. Processability: The ease of processing of the material during processing is also a factor that needs to be considered;
3. Installation convenience: Factors such as the weight and size of the material will also affect its installation convenience.

Summary
The selection of the heat exchanger tube material needs to be considered comprehensively based on the requirements of the working environment, the strength and corrosion resistance of the tube, and the cost. Different working conditions require the selection of different tube materials to ensure the operating efficiency and safety of the heat exchanger.