Special Steel Quality according to JIS G 3101, JIS G 4051, JIS G 4105. 1- ROLLED STEELS FOR GENERAL STRUCTURES: (Grades): SS330, SS400, SS490, SS540. STANDARD DIAMETERS in MM: 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 27, 28, 30, 32, 33, 36, 38, 39, 42, 45, 46, 48, 50, 52, 55, 56, 60, 64, 65, 70