1.1 This specification covers four grades (A, B, C, and D) of carbon steel plates of structural quality for general application. 1.2 When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service This specification covers four grades of carbon steel plates of structural quality for general application. Steel samples shall be melt processed by either open-hearth, basic-oxygen, or electric furnace. Heat and product analysis shall be performed whe