Now often hear people confuse oxygen-free copper and low-oxygen copper appear, in order to reduce the occurrence of this situation, I think it is necessary to help you through a certain method to correctly determine the type of product based on many years of experience in the actual use of the experience.
First of all, oxygen-free copper and oxygen-free copper is definitely not a material, they have a very big difference in performance, and if in the appearance of careful identification, it is also possible to find some can be distinguished between them.
Oxygen-free copper first and the latter's production process is not the same, according to the name can be heard, the main difference between the two is the different oxygen content. At this time someone said, I know a oxygenated, a non-oxygenated, although it sounds quite correct, in fact, is wrong. Although called oxygen-free copper, this material is also oxygenated, but the content is very small, small to negligible, such a material is not oxygen-free. The manufacturing process of the two materials is not the same, so there is a certain difference in their performance, the appearance of oxygen-free copper is more bright, so when encountering two products at the same time, the general brightness is better oxygen-free copper material.
Due to the production of copper rods of different processes, the production of copper rods in the oxygen content and appearance is different. On the cited production of copper rods, the process properly oxygen content in the following 10ppm, called oxygen-free copper rods; continuous casting of copper rods produced by continuous casting is under the protection of the conditions of hot rolling, the oxygen content in the range of 200-500ppm, but sometimes as high as 700ppm or more, in general, this method of copper produced by the appearance of the bright, and sometimes called the light rod.
Oxygen-free copper rod is also divided into imported equipment and domestic equipment, but the difference between the copper rod products out of not very big, only if the copper plate selection is good, the production control is more stable, the domestic equipment can also produce can be stretched to 0.05 of the copper rod. Imported equipment is usually Otto Kemp's equipment from Finland.
Oxygen-free and low-oxygen rods are easy to distinguish from each other in terms of oxygen content. Oxygen-free copper rods have an oxygen content of less than 10-20 PPM, but some manufacturers can only produce rods with an oxygen content of less than 50 PPM. Low oxygen copper rods in 200-400 PPM, good rods generally control the oxygen content of 250 PPM or so, oxygen-free rods generally take the upper lead method, low oxygen rods are continuous casting and rolling, the two kinds of products relatively speaking, low oxygen rods on the enameled wire performance is more adaptable to some, such as softness, resilience angle, winding performance. But the low oxygen rod on the wire drawing conditions are relatively more demanding, the same stretch 0.2 wire, if the wire stretching conditions are not good, ordinary oxygen-free rod can be pulled and good low oxygen rod on the wire breakage, but if you put in good wire stretching conditions, the same rod, low oxygen rod may be able to pull the double-zero-five, while the ordinary oxygen-free rods can only be stretched up to 0.1, of course, to do the most fine such as double-zero-two have to rely on imports of oxygen-free rods of copper. At present, some companies are trying to use the stripping method to process low oxygen rods to stretch 0.03 wire. But I am not sure about this.
Oxygen-free rods are preferred for audio cables, which is related to the fact that oxygen-free rods are monocrystalline copper and oxygen-free rods are polycrystalline copper.
Oxygen-free rods and oxygen-free rods are both used by electricians, and are nothing more than wires and cables, enameled wires, flat wires, and copper bushes. There is no difference in the field of application.
The difference between the two is the oxygen content, the national standard of oxygen content of low oxygen rod is less than 450PPM, oxygen-free rod is less than 20PPM.
Oxygen-free rod resistivity and processing performance are stronger than the low oxygen rod, so the high demand for electrical materials are generally used oxygen-free rod. For example, to do enameled wire, oxygen-free rod is certainly smaller resistance, applied to the motor, the heat situation is certainly better than the low oxygen rod, so the importance of the quality of the manufacturers are absolutely more willing to use oxygen-free rod as raw materials. And low oxygen rod wire drawing, it is difficult to pull the production of less than 0.5mm below the fine wire, and oxygen-free rod processing performance is much stronger.
So now is basically on the large specifications, resistance requirements of low electrical products with oxygen-free rod; small specifications, resistance requirements of high oxygen-free rod.
Nowadays, more and more cable companies tend to use oxygen-free copper rod as the raw material for cable production. Compared with ordinary copper rods, what are the advantages of oxygen-free copper rods in terms of performance?
"Compared with ordinary copper rods, oxygen-free copper rods have superior ductility and higher electrical conductivity, which is the most ideal raw material for wire and cable, electrical and electronic industries." A senior oxygen-free copper rod manufacturer said this.
Only copper rods with oxygen content below 20ppm can be called oxygen-free copper rods. Since the resistivity and processability of oxygen-free copper rods are stronger than that of ordinary copper rods, manufacturers who emphasize on quality will be more willing to use oxygen-free copper rods as raw materials. Compared with oxygen-free copper rods, ordinary copper rods have the disadvantage of being difficult to pull less than 0.5mm fine wire, so oxygen-free copper rods are especially welcomed by enameled wire and other fine wire manufacturers.
According to the oxygen content of copper rods, the characteristics of copper rods are different. Ordinary copper rods often have a significant portion of copper oxide impurities, which can negatively affect the toughness of the material. In contrast, excellent quality oxygen-free copper rods have almost no impurities present in them and have excellent toughness. Moreover, excellent oxygen-free copper rods have uniform organization and coarse crystals, which not only overcome the most common porous defects in ordinary copper rods, but also have the most superior pullability in all wire diameters.
Compared with ordinary copper rods, oxygen-free copper rods have high purity, low oxygen content, high electrical conductivity, good processing performance and other excellent characteristics, and the appearance of clean, rounded surface, no burrs, cracks, peeling and inclusions defects, with undoubted advantages.
So, with such excellent performance of oxygen-free copper rod means a high price? The industry's answer to this is negative, on the one hand, the current domestic production of oxygen-free copper rod is mainly used on the introduction of the method, the mainstream process itself has a short process, high rate of success, low cost, low investment, etc., so the price of oxygen-free copper rod compared to the price of ordinary copper rods will not be too much higher; on the other hand, the oxygen-free copper production process has been developed over the past 20 years, the operating methods and processes have been a lot of improvements! On the other hand, the oxygen-free copper production process has been developed for nearly 20 years, and there are many improvements in the operation method and process, such as increasing the refining process in the production procedure of the top-induction method, and utilizing the waste copper wires produced in the process of melting and refining in the top-induction method of the IF furnace, which eliminates the additional processing and transportation fees. With the perfect technology and production process, a mature oxygen-free copper rod manufacturing can make oxygen-free copper rod and ordinary copper rod cost difference.
