... St52-3 A709Gr50 A633D S275JO S355JO 12Cr1MoV 15CrMo low alloy steel plate Q345,Q390,Q420,Q460GB/T1591Makes mechanical device and ... mineral product automobile, excavator, car loader, bulldozer, each kind of hoist crane, coal mine hydraulic pressure support which were widely ... general construction and each kind of project machinery, like the mine and each kind of project construction.12Mn,15MnVN,16Mn, ...