1. The common feature of metal materials is that the hardness of pure metals is lower than that of their alloys, which have high hardness and low melting points. Oxygen-free copper and red copper are both pure copper, but the purity is different. The purity of oxygen-free copper is higher, and the purity of red copper can reach 99.9%~99.99% (different brands have some differences). Oxygen copper has the highest purity and is the softest, copper is slightly harder (close to oxygen-free copper), and brass is the hardest.

2. There is another characteristic of copper materials. The hardness will become soft after heat treatment, and it will become hard after cold working (cold work hardening). Due to the influence of the hardness and composition, grade, and impurities of non-ferrous metals and alloys, and the state, crystal The lattice structure has a lot to do with it, so there are generally few specific hardness data, which can only be described qualitatively.

3. What is the hardness of red copper? Red copper has a density (7.83g/cm3), a melting point of 1083 degrees, and a copper content of 99.9%. It is non-magnetic. It has good electrical conductivity, thermal conductivity and corrosion resistance. It is named after red. The electrical conductivity and thermal conductivity of copper are second only to silver, and it is widely used in the production of electrical and thermal equipment. Copper is in the atmosphere, sea water and some non-oxidizing acids, alkalis, salt solutions and various organic acids , has good corrosion resistance and is used in the chemical industry.

4. The density of brass (8.93g/ cm3) is mostly used as lining of mechanical bearings, wear-resistant, brass "density is greater than copper", copper-based alloy with zinc as the main alloying element, copper is about 60%; zinc is about 40% ;Individual grades contain about 1% lead, which is impurity. It is named because it is often yellow, the color of brass is beautiful, it has good process and mechanical properties, it has certain corrosion resistance, and its conductivity is lower than that of copper.

Brass or copper which has higher hardness, I believe everyone knows through the above introduction, of course, copper is more preferable in the manufacture of wires and cables. It has the smallest conductive resistance and is more suitable as a conductor. Its hardness is lower than that of brass, which makes the wire and cable softer. It is easier to operate during use and has less impurities, which increases the conductivity of copper.