Oxygen free copper according to oxygen and impurity content, anoxic copper is divided into No. 1 and No. 2 anoxic copper. No. 1 oxygen free copper purity reaches 99.97%, oxygen content is not more than 0.003%, the total impurity content is not more than 0.03%; The purity of No. 2 oxygen-free copper reaches 99.95%, the oxygen content is not more than 0.005%, and the total impurity content is not more than 0.05%. Oxygen free copper without hydrogen embrittlement phenomenon, high conductivity, processing and welding function, corrosion resistance and low temperature function are good. Countries on the standard of oxygen content is not completely the same, there are certain differences. OFC: metallic copper with purity of 99.995%. Generally used in audio equipment, vacuum electronic devices, cables and other electrical and electronic use. Among them, there are LC-OFC : purity above 99.995% and OCC: purity above 99.996%, and divided into PC-OCC and UP-OCC, etc. The single crystal oxygen free copper made by UP-OCC technology is non-directional, high purity, corrosion resistance and very low electrical impedance, which makes the wire suitable for high-speed and high-quality signal transmission.
Strictly distinguish, oxygen free copper should be divided into general oxygen free copper and high purity oxygen free copper. General oxygen free copper can be smelted in power frequency core induction furnace, high purity oxygen free copper smelting should be carried out in vacuum induction furnace. When semi-continuous casting method is selected, the refining process of melt in melting furnace and holding furnace can be free from time constraints. Continuous casting is different. The quality of liquid copper not only depends on the refining quality of the melting furnace and the holding furnace, but also depends on the stability of the whole system and the whole process. In order not to make the melt polluted, oxygen free copper smelting generally do not choose any additive method smelting and refining, melting pool surface cover charcoal and formed by the recovery atmosphere is the universal choice of smelting atmosphere.
Post time: Oct-19-2022