Temper embrittlement of chromium-molybdenum steel
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For a thermal low-temp separation vessel with 1.25Cr0.5Mo-0.25V as the base material, an operating temperature of 400°C, a design temperature of 437°C, and an operating pressure of 3.0 Mpa, is it necessary to consider temper embrittlement?
Our operating procedures specify that when the temperature of the chromium-molybdenum steel reactor is below 93 degrees, the pressure must not exceed 3.5 Mpa
That applies to hydrogenation reactors; the material commonly used for their structure is F22. Based on a pressure of 3.5 Mpa, your operating pressure should be around 14 Mpa. The containers I use here are heat-low-temp vessels with 1.25Cr0.5Mo as the main material, an operating temperature of 400°C, a design temperature of 437°C, and an operating pressure of 3.0 Mpa. Lower pressure, higher temperature!