What kind of copper rod is hypoxic copper rod? What is the production process of low oxygen copper rod? What are the introductions of hypoxic copper rods? First look at the definition of low-oxygen copper rods: copper rods with oxygen content between 200 (175) and 400 (450) ppm are produced by continuous casting and rolling methods using copper as raw material.
A brief introduction to the definition of low-oxygen copper rods, then let's introduce the related content of the introduction of low-oxygen copper rods.
Introduction to low-oxygen copper rod-low-oxygen copper rod processLow-oxygen copper rods are produced by continuous casting and rolling technology. The process flow is: electrolytic copper→shaft furnace→holding furnace→casting machine→continuous rolling mill→cleaning→rewinding machine→finished product (ф8mm) electrolytic copper continuous feeding. After the furnace is continuously melted, the copper water is released, which is cast into a trapezoidal ingot with a large cross section by a casting machine, and then enters the rolling mill for hot rolling, and is rolled into a ф8 copper rod billet.
- (1) Shaft furnace: A. Due to the small size of the shaft furnace, the electrolytic copper is melted while being added, and the molten copper water does not have the conditions for full reduction. .B. The entire melting process and the process of producing copper water cannot separate oxygen, so the oxygen content is very high. .C. Copper melting fuel is generally gas. During gas combustion, it will directly affect the chemical composition of copper liquid, and the impact is greater such as sulfur and hydrogen.
- (2) Casting machine: The crystal wheel of the casting machine turns the copper liquid into a solid process, so oxygen can not be blocked, so a second large amount of oxygen is absorbed during the casting process.
- (3) Temperature control: A. The temperature of copper liquid is not easy to control due to the large rolling volume and the restriction of many factors. B. The temperature of the ingot entering the rolling mill is required to be controlled at 850°C. The greater the deviation between the upper and lower sides, the greater the impact on the quality of the copper rod, and this temperature is difficult to control. C. The temperature of the copper rod of the rolling mill is required to be controlled at 600°C. The larger the deviation between the upper and lower sides, the greater the impact on the quality of the copper rod. Due to the constraints of the previous process, this temperature is also difficult to control. D. There are many links in the whole process, and some problems in one link will affect the temperature control.
- (4) Others: A. Due to some of the above defects, the quality of the copper rod will be unstable. Therefore, the standard stipulates that the continuous casting and rolling low-oxygen copper rod must be subjected to a torsion test before it leaves the factory. However, some manufacturers do not do it at all, or do not do it in batches according to the regulations (each batch should not exceed 60 tons), or reverse unqualified batches and leave the factory as usual. B. The high oxygen content will affect the wire drawing process. The harder the copper wire is drawn, the annealing should be added in the middle. High oxygen content will also affect electrical conductivity. C. In order to solve process defects, it is necessary to improve the performance of the unit as much as possible, so the price of the unit is expensive. For example, the US Southern Line Company produces 24,000 to 40,000 tons of units at a price of 6.9 million U.S. dollars, and Krupp in Germany is even more expensive. The user's own supporting facilities also cost hundreds of thousands to millions of dollars.
Introduction to low-oxygen copper rod-copper rod production process1. Dip coating molding method: It can produce large-length bright oxygen-free copper rods with a conductivity of 101-102% IACS, an oxygen content of less than 20 ppm, and a copper rod ring weighing 3.5-10 tons.
Dip coating molding utilizes the heat absorption capacity of cold copper rods. A thinner cold pure copper core rod (or seed rod) is used to vertically pass through a copper pool that can only maintain a certain liquid level, so that the copper water and the surface of the moving seed rod The copper is fused together, and gradually solidified and combined into a thicker cast copper rod, and then cooled, hot rolled, cooled, and wound into a circle. The entire process is closed and protected by inert gas.
2. Up-draw cold rolling method: It can produce large-length bright oxygen-free copper rods with a conductivity of 101～101.6% IACS, an oxygen content of less than 10ppm, and a copper rod ring weighs 2 tons.
It uses a tubular copper sleeve (that is, graphite crystallizer) whose lower end is extended and immersed under the molten copper surface, and the upper end is connected with a vacuum pump. At the beginning, the air in the crystallizer is drawn out. Under the action of vacuum, negative pressure is generated in the tube. Under pressure, the copper liquid is slowly attracted upwards, and quickly solidifies into a bright ingot near the lifter. Then it is cold rolled or cold drawn into rods. The copper rod produced by the up-drawing method has an oxygen content of less than 10 ppm and a bright surface.
3. Continuous casting and rolling method: It can produce long-length bright low-oxygen copper rods, with a conductivity of 101-102% IACS, an oxygen content of 200-300 ppm, and a copper rod ring weighing 5 tons.
4. Loop rolling method: Produce short-length black copper rod with oxide skin, conductivity of 99.5-100.5% IACS, oxygen content of 200-500ppm, copper rod ring weight is only 86-136 kg. (Due to the weight limitation of boat-shaped copper ingots)
Introduction to low-oxygen copper rod-grades and characteristics of low-oxygen copper rodThere 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 and the code is 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 rare in the market, 1# electrolytic copper is generally used as raw material, so the general grade of low-oxygen copper rod is: T2R.