Copper is the main raw material of cable industry, due to the different production mode and manufacturing process of each enterprise, there are two main production modes -- continuous casting and rolling and up-lead continuous casting. Copper rod continuous casting and rolling low oxygen production methods is more, its characteristic is melted in the shaft furnace, metal copper liquid through the holding furnace, chute, tundish, enter an enclosed cavity from depositing, larger cooling intensity is adopted to improve the cooling, form a slab, and then to carry on the multi-channel time rolling, hypoxia tonggan for hot working organization of production, the original casting organization is broken, Oxygen content is generally between 200 and 400ppm.

Copper is the main raw material of cable industry, due to the different production mode and manufacturing process of each enterprise, there are two main production modes -- continuous casting and rolling and up-lead continuous casting. Copper rod continuous casting and rolling low oxygen production methods is more, its characteristic is melted in the shaft furnace, metal copper liquid through the holding furnace, chute, tundish, enter an enclosed cavity from depositing, larger cooling intensity is adopted to improve the cooling, form a slab, and then to carry on the multi-channel time rolling, hypoxia tonggan for hot working organization of production, the original casting organization is broken, Oxygen content is generally between 200 and 400ppm.

Anaerobic copper rod is basically produced by up-lead continuous casting method in China. After the metal is melted in the induction furnace, it is up-lead continuous casting by graphite mold, and then cold rolling or cold processing is carried out. The anaerobic copper rod produced is cast structure with oxygen content generally below 20ppm. There are great differences in microstructure, distribution of oxygen content, form and distribution of impurities in both hypoxic and anaerobic copper rods. So what kind of copper is good copper?

One, pulling performance

The drawing performance of copper rod is related to many factors, such as impurity content, oxygen content and distribution, process control, etc. The drawing performance of copper rod is analyzed from the above aspects.

1. Influence of melting mode on impurities such as S

Continuous casting and rolling production of copper rod is mainly through the combustion of gas to melt copper rod, in the combustion process, through oxidation and volatilization, can reduce part of the impurities into the copper liquid to a certain extent, so the continuous casting and rolling method of raw material requirements are relatively low. Due to the induction furnace melting, the "copper green" and "copper beans" on the surface of electrolytic copper are basically melted into the copper liquid.

2. Entry of impurities in the casting process

In the production process, the continuous casting and rolling process needs to transfer copper liquid through insulated furnace, chute and tundish, which is relatively easy to cause the spalling of refractory materials. In the rolling process, it needs to pass the roller, resulting in the shedding of iron, which will cause external inclusion to the copper rod. In hot rolling, the oxides on and under the skin will have an adverse effect on the drawing of low oxygen rod. The production process of up-lead continuous casting method is short, the copper liquid is completed through the underflow type in the conjoined furnace, which has little impact on the refractory material, and the crystallization is carried out through the graphite mold, so the process may produce less pollution sources and less opportunities for impurities to enter.

3. Distribution pattern and influence of oxygen in low oxygen copper rod and no oxygen copper rod

Oxygen content has an obvious effect on the drawing performance of low oxygen copper rod. When the oxygen content increases to a better level, the wire breaking rate of copper rod is lower. This is because oxygen acts as a scavenger when reacting with most impurities. Moderate oxygen also helps to remove hydrogen in copper liquid, resulting in water vapor overflow and reducing the formation of pores. Better oxygen content provides better conditions for wire drawing process.

The oxygen content of oxygen-free copper exceeds the standard, the copper rod becomes brittle, the elongation decreases, the tensile style port shows dark red, the crystalline structure is loose, and the conductivity of the oxygen-free copper rod decreases. Therefore, the process and product quality of up-lead continuous casting are strictly controlled.

Two, the surface quality

In the process of producing electromagnetic wire and other products, the surface quality of copper rod should also be required. The surface of the copper wire after drawing has no burr, less copper powder and no oil pollution. The quality of copper powder on the surface was measured by torsion test and the recovery of the copper rod was observed to judge its quality.

From the raw material of rod to the economy of wire are different. The manufacture of oxygen-free copper rod requires high quality raw materials. Generally, when drawing copper wire with diameter >1mm, the advantage of low oxygen copper rod is obvious, while the advantage of no oxygen copper rod is more superior to drawing copper wire with diameter <0.5mm.

The wire making process of low oxygen copper rod is different from that of no oxygen copper rod. The wire making process of low oxygen copper rod can not be copied to the wire making process of no oxygen copper rod, at least the annealing process is different. Because the softness of wire is greatly affected by the material composition and rod - making, wire - making and annealing process, it is not simple to say which is soft and which is hard for hypoxic copper or anaerobic copper.

Anaerobic copper rod is basically produced by up-lead continuous casting method in China. After the metal is melted in the induction furnace, it is up-lead continuous casting by graphite mold, and then cold rolling or cold processing is carried out. The anaerobic copper rod produced is cast structure with oxygen content generally below 20ppm. There are great differences in microstructure, distribution of oxygen content, form and distribution of impurities in both hypoxic and anaerobic copper rods. So what kind of copper is good copper?

One, pulling performance

The drawing performance of copper rod is related to many factors, such as impurity content, oxygen content and distribution, process control, etc. The drawing performance of copper rod is analyzed from the above aspects.

1. Influence of melting mode on impurities such as S

Continuous casting and rolling production of copper rod is mainly through the combustion of gas to melt copper rod, in the combustion process, through oxidation and volatilization, can reduce part of the impurities into the copper liquid to a certain extent, so the continuous casting and rolling method of raw material requirements are relatively low. Due to the induction furnace melting, the "copper green" and "copper beans" on the surface of electrolytic copper are basically melted into the copper liquid.

2. Entry of impurities in the casting process

In the production process, the continuous casting and rolling process needs to transfer copper liquid through insulated furnace, chute and tundish, which is relatively easy to cause the spalling of refractory materials. In the rolling process, it needs to pass the roller, resulting in the shedding of iron, which will cause external inclusion to the copper rod. In hot rolling, the oxides on and under the skin will have an adverse effect on the drawing of low oxygen rod. The production process of up-lead continuous casting method is short, the copper liquid is completed through the underflow type in the conjoined furnace, which has little impact on the refractory material, and the crystallization is carried out through the graphite mold, so the process may produce less pollution sources and less opportunities for impurities to enter.

3. Distribution pattern and influence of oxygen in low oxygen copper rod and no oxygen copper rod

Oxygen content has an obvious effect on the drawing performance of low oxygen copper rod. When the oxygen content increases to a better level, the wire breaking rate of copper rod is lower. This is because oxygen acts as a scavenger when reacting with most impurities. Moderate oxygen also helps to remove hydrogen in copper liquid, resulting in water vapor overflow and reducing the formation of pores. Better oxygen content provides better conditions for wire drawing process.

The oxygen content of oxygen-free copper exceeds the standard, the copper rod becomes brittle, the elongation decreases, the tensile style port shows dark red, the crystalline structure is loose, and the conductivity of the oxygen-free copper rod decreases. Therefore, the process and product quality of up-lead continuous casting are strictly controlled.

Two, the surface quality

In the process of producing electromagnetic wire and other products, the surface quality of copper rod should also be required. The surface of the copper wire after drawing has no burr, less copper powder and no oil pollution. The quality of copper powder on the surface was measured by torsion test and the recovery of the copper rod was observed to judge its quality.

From the raw material of rod to the economy of wire are different. The manufacture of oxygen-free copper rod requires high quality raw materials. Generally, when drawing copper wire with diameter >1mm, the advantage of low oxygen copper rod is obvious, while the advantage of no oxygen copper rod is more superior to drawing copper wire with diameter <0.5mm

The wire making process of low oxygen copper rod is different from that of no oxygen copper rod. The wire making process of low oxygen copper rod can not be copied to the wire making process of no oxygen copper rod, at least the annealing process is different. Because the softness of wire is greatly affected by the material composition and rod - making, wire - making and annealing process, it is not simple to say which is soft and which is hard for hypoxic copper or anaerobic copper.