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What is the difference between the copper used for cables?

Update:2021-02-19
Abstract:

Outdoor Waterproof E27 String Lights CE Certification i […]

Outdoor Waterproof E27 String Lights CE Certification is the main raw material of the cable industry, and there are two main production methods-continuous casting and rolling method and upward continuous casting method. Because the two processes for producing copper rods are different, the oxygen content and appearance of the produced copper rods are different. The copper rods produced by the upstream, with proper technology, the oxygen content is below 10ppm, and they are called oxygen-free copper rods;

Low oxygen copper rod

Process disadvantages:

The electrolytic copper is melted while being added, and the molten copper water does not have the conditions to fully reduce. The entire melting process and the copper water process cannot separate oxygen, so the oxygen content is very high. The molten copper fuel is generally gas. During the combustion of the gas, it will directly affect the chemical composition of the copper liquid, and the greater the impact is sulfur and hydrogen.

Process advantages:

(1) The output is high. Generally, the output of small units can reach 10 to 14 tons per hour.

(2) The copper rod unloading adopts the plum blossom type, which is convenient for the unloading of the wire drawing machine.

(3) The take-up weight is large, generally up to 4 tons per reel.

Grades and characteristics of hypoxic copper rods:

There are three grades of low-oxygen copper rods, T1, T2, and T3. The low-oxygen copper rods are all hot rolled, so they are soft rods, code-named R.

(1) T1: Use high-purity electrolytic copper as raw material (copper content greater than 99.9975%) to produce low-oxygen copper rods.

(2) T2: Use 1# electrolytic copper as raw material (copper content greater than 99.95%) to produce low-oxygen copper rods.

(3) T3: Use 2# electrolytic copper as raw material (copper content greater than 99.90%) to produce low-oxygen copper rods. Because high-purity electrolytic copper and 2# electrolytic copper are few in the market, 1# electrolytic copper is generally used as raw material, so the general grade of low-oxygen copper rod is: T2R.

Oxygen-free copper rod

Oxygen-free copper rod is pure copper that does not contain oxygen or any deoxidizer residue. But in fact it still contains a very small amount of oxygen and some impurities. According to the standard, the oxygen content is not more than 0.02%, the total impurity content is not more than 0.05%, and the copper purity is more than 99.95%.

Generally, electrolytic copper is used for production, and the resistivity is lower than that of low-oxygen copper rods. Therefore, oxygen-free copper rods are more economical in the production of products with strict resistance requirements; the production of oxygen-free copper rods requires higher quality raw materials;

According to oxygen content and impurity content, oxygen-free copper rods are divided into TU1 and TU2 copper rods. The purity of TU1 oxygen-free copper rod reaches 99.99%, and the oxygen content is not more than 0.001%; ​​the purity of TU2 oxygen-free copper rod reaches 99.95%, and the oxygen content is not more than 0.002%.

The difference between the two

Low-oxygen copper rods and oxygen-free copper rods have their own characteristics due to differences in their manufacturing methods.

1. About the inhalation and removal of oxygen and its existence

The oxygen content of low-oxygen copper rods is generally 200 (175)-400 (450) ppm, so oxygen is inhaled in the liquid state of copper, while the up-draw method oxygen-free copper rods are the opposite. Oxygen is in liquid copper. After being kept for a long time, it is reduced and removed. Usually, the oxygen content of this rod is below 10-50ppm, and the lowest can reach 1-2ppm. Oxygen in oxygen-free copper is very low, so the structure of this copper is a uniform single-phase structure which is beneficial to toughness.

Second, the difference between the amount of debris and the existing hot rolling defects

The stretchability of oxygen-free copper rods is superior to that of low-oxygen copper rods in all wire diameters. In addition to the above-mentioned organizational reasons, oxygen-free copper rods have less inclusions, stable oxygen content, and no defects that may be caused by hot rolling , Lax monitoring of oxygen and unstable oxygen content will directly affect the performance of the rod. If the surface oxide of the rod can be compensated in the continuous cleaning of the subsequent process, but the more troublesome thing is that there are quite a lot of oxides existing "under the skin", which will have a more direct impact on the wire breakage.

3. There is a difference in the toughness of low-oxygen copper rods and oxygen-free copper rods

Both can be drawn to 0.015mm, but the low-temperature oxygen-free copper in the low-temperature superconducting wire has only 0.001mm between the filaments.

Fourth, the wire-making process of low-oxygen copper rods is different from that of oxygen-free copper rods

The wire-making process of the low-oxygen copper rod cannot be copied to the wire-making process of the oxygen-free copper rod, at least the annealing process of the two is different. Because the flexibility of the wire is deeply affected by the material composition and rod-making, wire-making and annealing process, it cannot be simply said that low-oxygen copper or oxygen-free copper is soft and hard.

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