Is the B value required to be interpolated based on the design temperature in external pressure calculations?
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For example, for material No. 10 steel at a temperature of 320°C, Figure 4-3 does not contain a curve corresponding to 320°C; only data for 260°C and 370°C are available. Which curve should be used to determine the B value? How do people usually handle such problems?
Use the data curve at 370°C to look up the B value?
Someone told me that the two-interpolation method should be used; let me put it together myself: first, find B corresponding to A based on the temperature curve of the lower level； Then, use the temperature curve at the higher temperature level to find B corresponding to A ； Note: For the first two cases as well, the B values can be calculated separately using interpolation based on the calculated A value ； Finally, using interpolation based on the two B values and the design temperature, the B value corresponding to the design temperature is calculated.