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How should we choose the raw material for the stainless steel heat exchange tubes
Stainless steel heat exchange tubes, due to their excellent corrosion resistance and hardness, can enhance the shock and vibration resistance of heat exchangers. They are currently important heat exchange components used in chemical production. We also know that stainless steel heat exchange tubes produced from different materials have different performance characteristics. Therefore, when customizing stainless steel heat exchange tubes, we need to clearly communicate with the manufacturer so as to reduce the corrosion and leakage of the heat exchange tubes. Then, do you know how to choose the raw materials for stainless steel heat exchange tubes?
We can select the raw materials for stainless steel heat exchange tubes based on the medium used and the operating conditions. For example, using 304L ultra-low carbon stainless steel to manufacture stainless steel heat exchange tubes can effectively reduce intergranular corrosion; using 2205 duplex stainless steel material to manufacture stainless steel heat exchange tubes can enhance their resistance to pitting and stress corrosion. It is worth noting that single-phase 321 stainless steel tubes are not suitable for use at 700℃. At this temperature, the phase on the alloy surface is unstable. After oxidation and heat preservation, the single austenite phase will transform into a dual-phase coexistence of austenite and ferrite, ultimately leading to a change in the oxide film structure. Therefore, such stainless steel heat exchange tubes are not suitable for use in heat exchangers operating at around 700℃.
2. We can select the raw materials based on the cost of the stainless steel heat exchange tubes. For example, 304L, a type of stainless steel with low carbon content, can enhance its resistance to intergranular corrosion, but it will sacrifice its strength index (304L is approximately 15% lower than 304). To ensure safe use, the corresponding design thickness needs to be increased, resulting in a direct increase in material cost. The anti-corrosion performance of duplex stainless steel is superior to that of austenitic stainless steel, but due to its high alloy content and complex production process, its market price is nearly 1.5 times that of austenitic stainless steel, and the material cost will increase significantly.
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