A36 is a low carbon steel that contains trace amounts of other elements such as manganese, phosphorus, sulfur, silicon, and copper. A36 is the most specified structural steel plate by engineers due to its good welding properties and high yield strength. ASTM A36 is most commonly fabricated into a variety of structural steel parts. This grade is used for welded, bolted or riveted structures in bridges and buildings, and for general structural purposes. Due to its lowest yield point, A36 can be used to design lighter weight structures and equipment, and provides good weldability.