The code name is usually represented by HB, that is, hardness Brinell hardness. Under a certain load, a hard steel ball with a certain diameter is pressed into the surface of the measured material, and the indentation diameter is measured, so as to calculate the hardness value of the material. The following are some common hardness ranges and codes for copper alloys:

1, brass (copper-zinc alloy): 60- 100HB, code HB60-HB 100.

2. Nickel-silver (copper-nickel alloy): 70- 1 10HB, code name is hb70-HB1/kloc-0.

3. Phosphor bronze (Cu-Sn-P alloy): 80- 100HB, code name HB80-HB 100.

4. aluminum bronze (copper-aluminum alloy): 80- 1 10HB, code name is hb80-HB1/kloc-0.