... structural steel plate 2The max weight of steel ingot is 60 ton 3The max thickness is 350mm 4GB/T700-2006 quality carbon structural ... strength low-alloy structural steelsQ345-Q460-Q550-Q690GB1591-2008A36,A283,A529ASTMSM400,SM490,SM520,SM570JIS G31064Structural steel for bridgesH: ... 10-50W:900-4800I:3000-2500012MnNiMoVDR,SPV450,SPV4908Low alloy steel plates for low temperature pressure vesselsH:6-120W ...