Oxygen-free copper row: process performance and main uses of oxygen-free copper
Oxygen-free copper is copper that does not contain oxygen or any deoxidizer residue. Oxygen-free copper has high electrical conductivity, good processing performance, weldability, corrosion resistance and low temperature performance, and no hydrogen embrittlement. Oxygen-free copper has strict requirements on the material. According to the copper content and the quality of the material, my country divides oxygen-free copper into two levels: TU1 and TU2.
Process performance of oxygen-free copper
1. Smelting and casting process. Oxygen-free copper is mainly smelted using power frequency cored induction furnaces. In order to ensure the quality of oxygen-free copper, "concentrate sealing" must be achieved, that is, the raw material should be electrolytic copper containing w (Cu) > 99.97% and w (Zn) < 0.003%. During smelting, attention must be paid to reducing the source of gas, and Use calcined charcoal to cover, and trace amounts of phosphorus can also be added as a deoxidizer. The ingots are cast using a semi-continuous casting process under nitrogen protection or banquet cover. The casting temperature is 1150-1180 degree .
2. Molding performance. Oxygen-free copper has excellent cold and hot working properties and can be stretched, rolled, extruded, bent, punched, sheared, spun, upsetting, forged, forged, threaded, knurled, wound, and has great forgeability. The best is 65% of forged brass. Thermal processing temperature is carried out at 800-900 degree .
3. Welding performance. It is easy to perform fusion welding, soft soldering, brazing, gas shielded tungsten arc welding, and gas shielded metal arc welding. Its performance in oxygen fuel gas welding is good. Shielded metal arc welding and most resistance welding methods are not recommended.
4. Cutting and grinding performance. The machinability of oxygen-free copper is 20% of that of free-cut brass HPb63-3.
The main uses of oxygen-free copper
Oxygen-free copper has high purity, excellent electrical conductivity, thermal conductivity, thermal processing performance and good welding performance, and has no or very little "hydrogen disease".
