This part of GB/T 17394 gives the tables of Leeb hardness values conversion for Types D, G and C impact devices.
2 Tables of Leeb Hardness Values Conversion for Type D Impact Devices
See Tables 1, 2, 3, 4, 5 and 6 respectively for the tables of Leeb hardness values conversion for Type D impact devices of carbon steel, low alloy steel and cast steel, cast iron, cast aluminium alloy, copper zinc alloy, copper aluminium alloy and copper tin alloy, pure copper and low copper alloy.