The hot rolled carbon, alloy, and high strength low alloy steels purchased under this specification are intended primarily for use in welded structures which are to be stress-relieved after welding. The classes and grades are limited to those shown in 1.2.2 with the mechanical properties and welding characteristics indicated in 3.2 and 3.3, respectively. The steel may be furnished in the forms listed in 1.2.1 Class A steels are especially intended for resistance welding applications, while Class B steels are intended primarily for other than resistance welding and for nonwelding applications. When the intended use of the material necessitates special or optional requirements, the purchaser should state in adequate detail the purpose for which the material is intended.