THIS GROUP OF SPECIFICATIONS COVERS A WIDE range of applications outside of the field of pressure vessels and power generation. Included are mechanical components such as gears and pinions, crankshafts, steel mill rolls and components for defense, railroads, and other applications that fall under the heading of General Industrial. The specifications fall into two main categories, those with stated chemical compositions and those in which, because the size range is not defined, the manufacturer generally chooses the required composition under the broad headings of carbon or alloy steels in order to obtain the mechanical properties stated in the specification.