Boiler and Pressure Vessel.ASME SEC II B SI UNITS.This part is a service book to the other Code Sections providing material specifications for nonferrous materials adequate for safety in the field of pressure equipment. These specifications contain requirements for heat treatment, manufacture, chemical composition, heat and product analyses, mechanical test requirements and mechanical properties, test specimens, and methods of testing. They are designated by SB numbers and are derived from ASTM "B" specifications.