A36 is a low-carbon steel that contains trace amounts of manganese, phosphorus, sulfur, silicon, copper and other elements. A36 has excellent welding performance and high yield strength, and is the most specified structural steel plate by engineers. ASTM A36 is most often manufactured into various structural steel parts. This grade is used for welded, bolted or riveted structures in bridges and buildings, as well as for general structural purposes. Due to its minimum yield point, A36 can be used to design lighter structures and equipment and provides good weld ability.