Which is more suitable for high-temperature environments, CS or Cr5Mo?

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Cr5Mo is more suitable for high-temperature environments, and its performance is significantly better than that of CS (carbon steel) especially in operating conditions above 600°C. Cr5Mo is a chromium-molybdenum alloy steel containing 4.00%~6.00% chromium and 0.45%~0.60% molybdenum, and it possesses excellent oxidation resistance, corrosion resistance, and high-temperature strength. Its high-temperature strength at 600°C can reach 27 MPa (σD,10h), and its long-term operating temperature can reach 580°C; it is suitable for extreme-high-temperature components such as reheater tubes with wall temperatures as high as 630°C–650°C. CS (carbon steel) generally refers to ordinary carbon steel; although it has a low cost and is easy to process, it begins to exhibit significant creep at temperatures above 400°C, and may lose its structural integrity within a short time at temperatures above 500°C, making it unsuitable for use in environments with long-term high-temperature exposure. Therefore, under severe conditions characterized by high temperature, high pressure, and corrosive media (such as in petrochemical heaters and power plant boiler superheaters), Cr5Mo is a more reliable choice ； CS is only suitable for medium and low-temperature, non-critical pipeline systems.