Does the material of equipment saddles need to have reduced impact resistance in low-temperature environments?
Thread Content
Looking at such a equipment diagram, the relevant data are: DN3600mm, L=10500mm, operating pressure of 0.9MPa, operating temperature of 50℃, and ambient temperature of -40℃. The shell material is 06Cr19Ni10, and the saddle material is Q345R. According to the drawings, Q345R plates with a thickness of ≥20mm are required to undergo low-temperature impact testing. I would like to ask everyone**: does the saddle material, Q345R steel plate, need to undergo a low-temperature impact test?
According to your materials, this is generally not done; per GB713 requirements, Q345 can only be used for impacts at -20 degrees Celsius, with an impact energy of 34 J. Additionally, the ambient temperature is defined; it is essential to clarify what is meant by ambient temperature.
GB713 specifies that Q345R must have a low-temperature impact resistance of no more than 0°C upon leaving the factory; therefore, for any material of type 345R, test data on low-temperature impact resistance is required, regardless of its intended use. Wugang Panglong
JB/T4712 specifies that when the design temperature for saddle supports is equal to or lower than -20°C, design requirements should be based on the actual conditions; if necessary, the designer may impose additional low-temperature testing requirements on materials such as the web, or choose other suitable materials.
Reply to 5# General Ode: Warring States. Thank you; indeed, this sentence is included in the standard version
Actually, Q235A is sufficient; there’s no need to choose Q345R. Refer to clause 3.5 of the interpretation of standard JB/T4712.1-2007.