Often hear people confuse oxygen-free copper and low-oxygen copper, in order to reduce the occurrence of this situation, I think it is necessary to help you to correctly determine the type of product through certain methods based on many years of practical experience.
First of all, oxygen-free copper and low-oxygen copper is definitely not a material, they have a very big difference in performance, and if you make a careful identification in the appearance, you can also find some differences.
First of all, oxygen-free copper and low-oxygen copper production process is not the same, according to the name can be heard, the two main difference is the oxygen content of the different ...... At this time someone said, I know a oxygen, an oxygen-free, although it sounds quite right, in fact, is wrong!
Although called oxygen-free copper, but this material is also oxygenated! (except that the content is very small, negligible, but not oxygen-free) Oxygen-free copper and low-oxygen copper manufacturing process is not the same, so, they are also in the performance of certain differences. In appearance, oxygen-free copper has a brighter appearance! So when encountering both materials at the same time, the better brightness is usually the oxygen-free copper material.
Back to copper rods. As mentioned earlier, the oxygen content and appearance in copper rods varies due to the different processes used to produce them.
Copper rods produced with the top-quoted method, the process properly oxygen content of 10ppm or less, called oxygen-free copper rods.
With continuous casting and rolling process production of copper rods is in the protection of the conditions of hot rolling, the oxygen content in the range of 200-500 ppm, but sometimes up to 700 ppm or more, in general, this method of production of copper appearance bright, low-oxygen copper rods, and sometimes called light rod. Of course, there is also dip-coating method, higher quality.
Oxygen-free copper rod is also divided into imported equipment to do and domestic equipment to do, but the copper rod products out of the difference is not very big, as long as the copper plate is well selected, the production control is more stable, the domestic equipment can also be output can be stretched 0.05 copper rod.
Oxygen-free and low-oxygen rod from the oxygen content is easy to distinguish, oxygen-free copper is oxygen content in 10-20 PPM below, but some manufacturers can only do 50 PPM below. Oxygen-free rod in 200-400 PPM, a good rod is generally controlled in the oxygen content of 250 PPM or so, oxygen-free rod is generally taken on the introduction of the method, oxygen-free rod is continuous casting and rolling, the two products compared to low-oxygen rod on the enameled wire performance is more adaptable to some, such as softness, resilience angle, winding performance. However, the low oxygen rod is relatively harsh on the wire drawing conditions! The same stretching 0.2 wire, if the stretching conditions are not good, then the ordinary oxygen-free rod can be pulled, and a good low oxygen rod will break the line.
But if placed in good stretching conditions, the same rod, low oxygen rod may be able to pull to 0.05, while the ordinary oxygen-free rod can only stretch up to 0.1 only, of course, to do the thinnest, such as 0.02, but have to rely on imported oxygen-free copper rod. Currently there are companies try to use stripping the way to deal with low-oxygen rods to stretch 0.03 wire. But about this aspect I am not very clear.
Audio wire generally prefer to use oxygen-free rods instead, which is related to the oxygen-free rods are monocrystalline copper, low-oxygen rods are polycrystalline copper.
Oxygen-free rod and oxygen-free rod are used for electricians, but it is wire and cable, enameled wire, flat wire, copper row. There is no difference in the field of application. The difference between the two is the oxygen content, the national standard 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 low oxygen rod, so the high requirements of the 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 is certainly better than the low oxygen rod, so the manufacturers who value the quality are definitely 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 basically is: large size, low resistance requirements of electrical products with oxygen-free rod; small size, high resistance requirements with oxygen-free rod.
We all know that oxygen-free copper rods are better, so does the excellent performance of oxygen-free copper rods mean a high price?
At present, the domestic production of oxygen-free copper rod, the main use of the upper lead method, this mainstream process has a short process, high rate of material, low cost, low investment and other advantages, so the price of oxygen-free copper rods compared to the price of ordinary copper rods, will not be too much higher. In addition, oxygen-free copper production process after more than 20 years of development, there have been many improvements. A mature oxygen-free copper rod manufacturer can make the cost difference between oxygen-free copper rod and ordinary copper rod.
