Using the value of A calculated in Step 3, enter
the applicable material chart in Subpart 3 of Section II,
PartDfor the material under consideration. Move vertically
to an intersection with the material /temperature line for
the design temperature (see UG-20). Interpolation may be
made between lines for intermediate temperatures. If tabular
values in Subpart 3 of Section II, Part D are used, linear
interpolation or any other rational interpolation method
may be used to determine a B value that lies between two
adjacent tabular values for a specific temperature. Such
interpolation may also be used to detemine a B value at
an intermediate temperature that lies between two sets of
tabular values, after first determining B values for each set
of tabular values