... grade: ST37, A36, SS400, ST52, SM490, SM570 3. Length: 6METER, 9 METERS 1.standardGB/T 1591, GB/T700, ASTM, EN, DIN2 ... . Steel gradeST37, A36, SS400, ST52, SM490, SM5703. Length6METER, 9 METERS, 12METERS or customized.4. packingBlack painting and in bundles5 ...