GB/T18982-2003 Q325NHYJ Weather Resistant Steel Coil GB/T18982-2003 Q245NHYJ Weather Resistant Steel Coil GB/T18982-2003 Q310GNHJ Weather Resistant Steel Coil GB/T18982-2003 Q310GNHLJ Weather Resistant Steel Coil GB/T18982-2003 Q345GNHJ Weather Resistant Steel Coil GB/T18982-2003 Q345GNHLJ Weather Resistant Steel Coil GB/T18982-2003 Q295GNHJ Weather Resistant Steel Coil