Nominal diameter of copper pipe (mm) 8,10,15,20,25,32,40,50,65,80,100,125,150, in 1/4 3/8 1/2 5/8 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6
Average diameter (mm), 9.52, 12.7, 15.88, 19.05, 22.22, 28.58, 34.92, 41.28, 53.98, 66.68, 79.38, 92.08, 104.78, 130.18, 155.58 K magnitude 0.89, 1.24, 1.24, 1.24, 1.65, 1.65, 1.65, 1.83, 2.11, 2.41, 2.77, 3.05, 3.40, 4.06, 4.78
Wall thickness (mm) L grade 0.76, 0.89, 1.02, 1.07, 1.14, 1.27, 1.40, 1.52, 1.78, 2.03, 2.29, 2.54, 2.79, 3.18, 3.56 M class 0.64, 0.71, 0.81, 0.89, 1.07, 1.24, 1.47, 1.65, 1.83, 2.11, 2.41, 2.77, 3.10
The application of copper tubes is much more extensive than pure iron, and 50% of copper is purified into pure copper by electrolysis every year, which is used in the electrical industry. The copper mentioned here is indeed very pure, containing more than 99.95% copper, and a very small amount of impurities, especially phosphorus, arsenic, aluminum, etc., will greatly reduce the conductivity of copper. The oxygen content of copper (it is easy to mix a small amount of oxygen in copper smelting) has a great impact on the conductivity, and the copper used in the electrical industry must generally be oxygen-free copper. In addition, impurities such as lead, antimony and bismuth will make the crystallization of copper cannot be combined together, resulting in hot brittleness, which will also affect the processing of pure copper. This kind of pure copper with high purity is generally refined by electrolysis: the impure copper (that is, crude copper) is used as the anode, pure copper is used as the cathode, and copper sulfate solution is used as the electrolyte. When the current passes through, the impure copper on the anode gradually melts, and the pure copper gradually settles on the cathode. Copper thus refined; Purity up to 99.99%. Copper is a relatively pure kind of copper, generally can be approximately considered to be pure copper, electrical conductivity, plasticity are better, but the strength, hardness is poor.
