AlainaR,
I have the '62 Code and from the Summer 1964 Addenda (Issued 30-June-64), Table UHA-23 S = 17,500 psi @ 200F (SA240-316L)which is covered by Note 1. There is the lower S value of 16,250 psi.
Note 1 states: "Due to the relatively low yield strength of this material, the higher stress values at temperatures from 200 through 1050F were established to permit the use of this material where slightly greater deformation is acceptable. The stress values within this range exceed 62-1/2%, but do not exceed 90% of the yield strength at temperature. These stress values are not recommended for the design of flanges or piping."
These values are the same in UHA-23 prior to the various Addenda being issued. They are also the same in the 1968 Code.
IHS Markit is where I purchase older code editions but there are probably other outlets.
Hopefully this helps.
Patrick