The high pressure resistance of stainless steel heat exchange tubes is excellent, which is related to material characteristics, manufacturing processes, and design parameters.
Firstly, let’s talk about the material selection. 304 stainless steel heat exchange tubes are suitable for medium and low pressure scenarios up to 2.5 MPa, with low cost and stable overall performance; 316L stainless steel heat exchange tubes have stronger pressure resistance (>6.4 MPa) due to the addition of molybdenum element, making them particularly suitable for high-pressure environments with chloride ion media; Special alloys such as S31254 super austenitic steel have better high-pressure compatibility and can replace titanium alloys.
Furthermore, regarding the influence of wall thickness and outer diameter, an increase in wall thickness directly enhances the pressure bearing capacity (for example, a 2.0mm thick 304 pipe can withstand a water pressure of 3.28 MPa); As the outer diameter increases, the pressure bearing capacity decreases, and it is necessary to balance heat transfer efficiency and safety through optimized design.
In terms of structure, choosing seamless stainless steel heat exchange tubes has higher pressure resistance than welded tubes, reducing the risk of leakage.
For high-pressure scenarios, thick walled designs (such as Sch80 standard) are preferred and verified through hydraulic tests (usually 1.5 times the working pressure).