Grade A 36, SS400, Q235 standard Grade A 36 is the material of American standard ASME standard (equivalent to ASTM specification), SS400 is the material of Japanese standard JIS G3101 (rolled steel for general structure), and Q235 is the material of national standard GB700 standard. ASTM 36 is an American standard carbon structural plate, which implements the standard ASTM A36/A36M-03a. This standard applies to riveting, bolting and welding structures used in bridges and buildings, as well as general-purpose structural steel quality carbon steel sections and steel plates. And bar steel. Grade Q235 general carbon structural steel is also called A3 plate. Q represents the yield limit of this material. The following 235 refers to the yield value of this material, which is around 235MPa. And the yield value will decrease with the increase of the thickness of the material. Due to the moderate carbon content, the overall performance is better, the strength, plasticity and weldin