Chinese copper processing materials can be divided into: ordinary copper (T1, T2, T3, T4), oxygen-free copper (TU1, TU2 and high-purity, vacuum oxygen-free copper), deoxidized copper (TUP, TUMn), adding a small amount of alloy Elements of special copper (copper arsenic, tellurium copper, silver copper) four categories. The electrical conductivity and thermal conductivity of red copper is second only to silver, and it is widely used to make electrical and thermal equipment. Red copper has good corrosion resistance in the atmosphere, sea water and certain non-oxidizing acids (hydrochloric acid, dilute sulfuric acid), alkalis, salt solutions and various organic acids (acetic acid, citric acid).
|Name||Chinese grades||Japanese grades||German grades||American grades||British grades|
|Oxygen free copper||TU0||C1011||C10100||C110||—|
|No.1 oxygen-free copper||TU1||C1020||OF-Cu||C10200||C103|
|No. 2 oxygen-free copper||TU2||C1020||OF-Cu||C10200||C103|
|Number One Copper||T1||C1020||OF-Cu||C10200||C103|
|Copper No. 2||T2||C1100||SE-Cu||C11000||C101|
|No. 3 copper||T3||C1221||—||—||—|
|No.1 Phosphorus Deoxidized Copper||TP1||C1201||SW-Cu||C12000||—|
|Phosphorus deoxidized copper No. 2||TP2||C1220||SF-Cu||C12000||—|
The use of copper is much wider than pure iron. Every year, 50% of copper is electrolytically purified to pure copper, which is used in the electrical industry. The red copper mentioned here is indeed very pure, containing more than 99.95% copper. A very small amount of impurities, especially phosphorus, arsenic, aluminum, etc., will greatly reduce the conductivity of copper. It can be mainly used in electrical appliances, steamed buildings and chemical industries, especially terminal printed electrical circuit boards, copper tapes for shielding wires, air cushions, busbar terminals; electromagnetic switches, pen holders, and roofing boards. The mold manufacturing industry consumes a lot of this, thus Cause high prices.
It is used to make electrical equipment such as generators, busbars, cables, switchgears, transformers and other heat conduction equipment such as heat exchangers, pipelines and flat-plate collectors of solar heating devices. Oxygen in copper (a small amount of oxygen is easily mixed during copper smelting) has a great influence on conductivity. Copper used in the electrical industry must generally be oxygen-free copper. In addition, impurities such as lead, antimony, and bismuth will prevent the copper crystals from joining together, causing thermal embrittlement and affecting the processing of pure copper. This kind of pure copper with high purity is generally refined by electrolytic method: impure copper (ie, blister copper) is used as anode, pure copper is used as cathode, and copper sulfate solution is used as electrolyte. When the current passes, the impure copper on the anode gradually melts, and the pure copper gradually precipitates on the cathode. Copper thus refined; purity up to 99.99%.
It is also used in the production of motor short-circuit rings, electromagnetic heating inductors, high-power electronic components, terminal blocks and the like.
It has also been applied to furniture and decoration such as doors, windows and armrests.