How to correctly determine low-temperature impact energy and impact temperature
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GB150.2 Table 4 lower limit of service temperature of steel plate (P47). When the material is a Q245R normalized steel plate with a thickness of 6, the working temperature is -20°C, and the design temperature is -30°C, what temperature should be used for the impact energy test of the steel plate (0°C, -20°C, -30°C, or higher than -30°C)? How should the value of absorbed impact energy be determined? The problem stems from ( 150.2.4.1 .11 P46)
Isn't the lower limit of operating temperature -20°? Can't it be used at -30°? Shouldn't the material be changed?
You have exceeded the lower limit of use temperature. The material should meet the performance at the design temperature.