... S355JR A572Gr50 St52-3 A709Gr50 A633D S275JO S355JO 12Cr1MoV 15CrMo low alloy steel plate Q345,Q390,Q420,Q460GB/T1591Makes mechanical device ... drive wheel counter- mine trolley, mineral product automobile, excavator, car loader, bulldozer, each kind of hoist crane, coal mine hydraulic pressure ... ) S355JR A572Gr50 St52-3 A709Gr50 A633D S275JO S355JO 12Cr1MoV 15CrMo low alloy steel plate