c. Different formulas are available according to practical physical and chemical indicators, such as hardness, strength, elasticity, high temperature resistance, electrical conductivity, thermal conductivity and other engineering comprehensive indexes.
d. Application:
Example: Tin phosphor bronze: good elasticity, used as spring sheet for lamps and switches.
Resistance welding electrode materials (roller welding machine, butt welding machine, touch welding machine, riveting welding machine) chromium zirconium copper, beryllium cobalt copper.
The scope of application is extremely wide and diverse.
More and more non-mining enterprises are entering the mineral resource market, making the resource pattern full of variables, especially the prices of mineral products.
2. Copper for electric spark: also known as electrolytic copper
Around 1940, the former Soviet Academy of Sciences switched from anti-electrolytic corrosion to electrolytic corrosion to size processing of metal materials due to the phenomenon of sparks burning the surface when the plug was opened and closed. In 1943, the first electric spark processing 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. Adding alloys
4. Cost: affecting price
a. Raw material selection
b. Smelting process
