Copper for EDM: also known as electrolytic copper
In 1943, the first EDM machine was developed, which could process 60HRC steel.
2. Expression method:
China: Resistivity ρ≤ 0.0017771 Ω. mm2 / m (20℃)
EU: Conductivity 1/ρ≥56.27 MS / m
US and Japan: Conductivity 56.27 X 1.73 = 97.34 % IACS
3. Deoxidation method:
a. Phosphorus
b. Nitrogen protection
c. Add alloy
4. Cost: affecting price
a. Raw material selection
b. Smelting process
