... standard: GB, ASTM, JIS Material: Q195, Q235,Q345B, SS400 Specification: 20*20mm~200*200mm, length: 6m,9m,12m 1. Item: steel ... . Standard: GB, ASTM, JIS3. Material: Q195, Q235,Q345B, SS4004. Specification: 20*20mm~200*200mm, length: 6m,9m,12m5. Terms of payment ...