I believe that we have all purchased wires more or less, but the prices of wires of the same specification are quite different from those of the same specifications. The most important factor affecting the price is copper. Today, the editor of Yinglian will analyze the following two coppers in detail for us. rod.

Copper rod 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. Due to the different processes for producing copper rods, the oxygen content and appearance of the copper rods produced are different. The copper rod produced by the upper lead has a proper oxygen content below 10ppm, which is called an oxygen-free copper rod;

Hypoxic copper rod

Workmanship defects:

The electrolytic copper is melted while being added, and the molten copper water has no conditions for sufficient reduction. The entire melting process and the process of copper water production cannot be isolated from oxygen, so the oxygen content is very high. The molten copper fuel is generally gas. During the combustion process of the gas, it will directly affect the chemical composition of the copper liquid, and the influences include 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 wire drawing machine to pay off the wire.

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

Oxygen-free copper rod

Oxygen-free copper rods are pure copper without oxygen and without any deoxidizer residues. But in fact it still contains a very small amount of oxygen and some impurities. According to the specification, the content of oxygen is not more than 0.02%, the total content of impurities is not more than 0.05%, and the purity of copper 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, in the production of products with stricter resistance requirements, oxygen-free copper rods are more economical; making oxygen-free copper rods requires high-quality raw materials;

difference between the two

Due to the different production methods, the hypoxic copper rod and the oxygen-free copper rod are different and have their own characteristics.

1. About the inhalation and desorption of oxygen and its state of existence

The oxygen content of the low-oxygen copper rod is generally 200 (175) - 400 (450) ppm, so the entry of oxygen is inhaled in the liquid state of copper, while the oxygen-free copper rod of the upward-drawing method is the opposite, and the oxygen is in the liquid copper. After holding for a considerable time, it is reduced and removed. Usually, the oxygen content of this rod is below 10-50 ppm, and the lowest can reach 1-2 ppm. Oxygen in oxygen-free copper is very low, so the arrangement of this copper is a uniform single-phase arrangement, which is good for toughness

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

The drawability of the oxygen-free copper rod is superior to that of the low-oxygen copper rod in all wire diameters. In addition to the above arrangement reasons, the oxygen-free copper rod has less inclusions, stable oxygen content, and no defects that may be caused by hot rolling. , The oxygen monitoring is not strict, and the unstable oxygen content will directly affect the performance of the rod. If the surface oxide of the rod can be compensated in the subsequent cleaning of the subsequent process, it is more troublesome that a considerable amount of oxide exists "under the skin", which has a more direct impact on the wire breakage.

3. The toughness of the low-oxygen copper rod and the oxygen-free copper rod is different

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

4. The wire making process of the hypoxic copper rod is different from that of the oxygen-free copper rod

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 softness 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.

The above are the two different copper rods that Xiaobian Yinglian introduced in detail for us. I believe we should understand the reasons for the different prices. It makes sense that you get what you pay for.