304 Stainless Steel Pitot Probes Temperature Resistance Limits (650°C) and Corrosion Resistance Test Data

304 Stainless Steel Pitot Probes Temperature Resistance Limits (650°C) and Corrosion Resistance Test Data

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　　304 stainless steel is a common material for pitot probes in moderate environments, but understanding its temperature and corrosion limits is essential for proper application.5-Hole Pitotwelcome to click on the website to learn more!

　　In terms of temperature resistance, 304 stainless steel maintains structural integrity up to 650°C, but prolonged exposure above 600°C can lead to carbide precipitation, reducing corrosion resistance. A laboratory test showed that after 500 hours at 650°C, the material’s tensile strength dropped by 15%, though it still met basic measurement requirements for low-precision scenarios

　　Corrosion resistance is another key factor. 304 performs well in dry air and mild aqueous environments but struggles with chloride-rich settings. Immersion tests in 5% NaCl solution (simulating coastal or marine environments) revealed visible pitting after 300 hours, with corrosion rates reaching 0.12mm/year—significantly higher than in freshwater (0.01mm/year)

　　For applications like industrial ventilation systems or indoor airflow testing, 304 stainless steel probes are reliable and cost-effective. However, in coastal areas or high-chloride environments, upgrading to 316 stainless steel (with 2-3% molybdenum) is advisable, as it reduces corrosion rates by up to 80% in salt-laden air.

　　Practical maintenance includes regular cleaning with a soft brush to remove debris, as accumulated particles can accelerate localized corrosion. In one food processing plant, a 304 probe failed prematurely due to sugar residue buildup, highlighting the need for routine inspection in contaminated airflow.